{"id":1284,"date":"2025-10-23T14:18:27","date_gmt":"2025-10-23T12:18:27","guid":{"rendered":"https:\/\/wus-online.de\/service\/dimensioning-of-the-roof-drainage-system\/"},"modified":"2026-08-13T16:27:17","modified_gmt":"2026-08-13T14:27:17","slug":"dimensioning-of-the-roof-drainage-system","status":"publish","type":"page","link":"https:\/\/wus-online.de\/en\/service\/dimensioning-of-the-roof-drainage-system\/","title":{"rendered":"Dimensioning of the Roof Drainage System"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1284\" class=\"elementor elementor-1284 elementor-694\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-47c6eb5 e-con-full e-flex e-con e-parent\" data-id=\"47c6eb5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-7ed0957 e-con-full e-flex e-con e-child\" data-id=\"7ed0957\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-38b8dc0 e-con-full e-flex e-con e-child\" data-id=\"38b8dc0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-53104e2 elementor-widget elementor-widget-heading\" data-id=\"53104e2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Properly dimensioning roof drainage<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-335c8eb elementor-widget elementor-widget-heading\" data-id=\"335c8eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Our service tool supports you in the reliable planning of your system.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ed056b4 e-flex e-con-boxed e-con e-parent\" data-id=\"ed056b4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c623d0a elementor-widget elementor-widget-heading\" data-id=\"c623d0a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Dimensioning of the Roof Drainage System<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8898774 elementor-widget elementor-widget-heading\" data-id=\"8898774\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Stay up-to-date.\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9912c1a elementor-widget elementor-widget-text-editor\" data-id=\"9912c1a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Which downpipe (and how many per wall side?) do I need for my construction project?<br>What does this mean for the selection of suitable gutter brackets up to the next drainage line (&#8230;quantity, hole pattern?)?<br>With its &#8220;Calculation aid for dimensioning the roof drainage system&#8221;, WUS provides you with an orientation as to what you actually need and \u2014 in what quantities. The regulations of the professional associations must be observed: &#8220;Zentralverband des Dachdeckerhandwerks (ZVDH)&#8221;, as well as the &#8220;Zentralverband Sanit\u00e4r Heizung Klima (ZVSHK)&#8221;.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fb3256f e-flex e-con-boxed e-con e-parent\" data-id=\"fb3256f\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-946a35b elementor-widget elementor-widget-text-editor\" data-id=\"946a35b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Sizing Guidelines<\/strong><br>The sizing of rainwater drainage pipes, and consequently the determination of gutter size, depends on the rainfall intensity, as well as the roof area and the runoff coefficient (slope, surface condition). For dimensioning the roof area, the customer&#8217;s specifications are used. Wegen der erh\u00f6hten Verschmutzungsgefahr von Dachrinnen werden Regenfallleitungen, um Eindringen von Niederschlagswasser aus der Dachrinne in das Geb\u00e4ude zu vermeiden, f\u00fcr eine Regenspende von je nach Region mindestens 300I\/(s x ha) bemessen.<br>Um einen Str\u00f6mungstechnisch g\u00fcnstigen \u00dcbergang von der Dachrinne zum Regenfallrohr gewehrleisten zu k\u00f6nnen, werden nach DIN 1986 &#8211; 2 trichterf\u00f6rmige Einl\u00e4ufe verwendet.<\/p><p><strong>Rainfall intensity (r):<\/strong><br>Rainfall intensity (r) is the measured amount of rain per unit of time, relative to the area in l\/(s x ha).<br>For the amount of rain, when dimensioning roof drainage systems, the peak load values in a short unit of time and their frequency are significant.<\/p><p><strong>Rainwater runoff Q:<\/strong><br>Rainwater runoff is defined as the amount of water supplied to the rainwater pipes per second (l\/s).<\/p><p><strong>Nominal size:<\/strong><br>Size specification for all types of gutters and downpipes, based on the cut width or clear width.<\/p><p><strong>Roof footprint (A):<\/strong><br>The footprint of an inclined roof projected onto the horizontal plane.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4881fc9 e-flex e-con-boxed e-con e-parent\" data-id=\"4881fc9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-da0e7d8 elementor-widget elementor-widget-shortcode\" data-id=\"da0e7d8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\n<div class=\"roof-drainage-calculator\">\n    <div class=\"rdc-container\">\n        \n        <!-- Header - NUR blaue Schrift, kein Hintergrund -->\n        <div class=\"rdc-header\">\n            <h2>Berechnungs&shy;hilfe f\u00fcr die Dimen&shy;sionierung der Dach&shy;entw\u00e4sserungs&shy;anlage<\/h2>\n        <\/div>\n        \n        <!-- Intro Text -->\n        <div class=\"rdc-intro\">\n            <ul>\n                <li>Welches Fallrohr (...und wie viele pro Wandseite?) brauche ich f\u00fcr mein Bauvorhaben?<\/li>\n                <li>Was bedeutet das f\u00fcr die Wahl der passenden Rinnentr\u00e4ger bis zum n\u00e4chsten Entw\u00e4sserungsstrang (...Menge, Lochbild)?<\/li>\n            <\/ul>\n            <p>\n                WUS liefert Ihnen mit seiner \"Berechnungshilfe f\u00fcr die Dimensionierung der Dachentw\u00e4sserungsanlage\" eine Orientierung was Sie tats\u00e4chlich ben\u00f6tigen und \u2014 \n                in welchen Mengen. Es sind Regelwerke der Fachverb\u00e4nde: \"Zentralverband des Dachdeckerhandwerks (ZVDH)\", sowie des \"Zentralverband Sanit\u00e4r Heizung Klima (ZVSHK)\" zu beachten.\n            <\/p>\n            <p class=\"rdc-hint\">\n                Bitte beachten Sie den <a href=\"\/service\/dimensionierung-der-dachentwaesserungsanlage\/nutzungsvoraussetzung\/\" target=\"_blank\" class=\"rdc-info-link\">Hinweis zur Nutzungsvoraussetzung<\/a>.\n            <\/p>\n        <\/div>\n        \n        <form id=\"roof-drainage-form\" class=\"rdc-form\">\n            <input type=\"hidden\" id=\"roof_drainage_nonce\" name=\"roof_drainage_nonce\" value=\"d86cfff9e5\" \/><input type=\"hidden\" name=\"_wp_http_referer\" value=\"\/en\/wp-json\/wp\/v2\/pages\/1284\" \/>            \n            <div class=\"rdc-form-grid\">\n                <div class=\"rdc-form-left\">\n                    \n                    <!-- Stadt Auswahl -->\n                    <div class=\"rdc-form-group\">\n                        <label for=\"rdc-city\" class=\"rdc-label\">\n                            Standort des Geb\u00e4udes\n                            <span class=\"rdc-small-text\">Bitte die n\u00e4chst gr\u00f6\u00dfere Stadt der Region angeben<\/span>\n                        <\/label>\n                        <div>\n                            <select id=\"rdc-city\" name=\"city\" class=\"rdc-select\" required>\n                                                                    <option value=\"Aachen\">\n                                        Aachen                                    <\/option>\n                                                                    <option value=\"Aschaffenburg\">\n                                        Aschaffenburg                                    <\/option>\n                                                                    <option value=\"Augsburg\">\n                                        Augsburg                                    <\/option>\n                                                                    <option value=\"Aurich\">\n                                        Aurich                                    <\/option>\n                                                                    <option value=\"Bad Kissingen\">\n                                        Bad Kissingen                                    <\/option>\n                                                                    <option value=\"Bad Salzuflen\">\n                                        Bad Salzuflen                                    <\/option>\n                                                                    <option value=\"Bad T\u00f6lz\">\n                                        Bad T\u00f6lz                                    <\/option>\n                                                                    <option value=\"Bamberg\">\n                                        Bamberg                                    <\/option>\n                                                                    <option value=\"Bayreuth\">\n                                        Bayreuth                                    <\/option>\n                                                                    <option value=\"Berlin\">\n                                        Berlin                                    <\/option>\n                                                                    <option value=\"Bielefeld\">\n                                        Bielefeld                                    <\/option>\n                                                                    <option value=\"Bocholt\">\n                                        Bocholt                                    <\/option>\n                                                                    <option value=\"Bonn\">\n                                        Bonn                                    <\/option>\n                                                                    <option value=\"Braunschweig\">\n                                        Braunschweig                                    <\/option>\n                                                                    <option value=\"Bremen\">\n                                        Bremen                                    <\/option>\n                                                                    <option value=\"Bremerhaven\">\n                                        Bremerhaven                                    <\/option>\n                                                                    <option value=\"Chemnitz\">\n                                        Chemnitz                                    <\/option>\n                                                                    <option value=\"Cottbus\">\n                                        Cottbus                                    <\/option>\n                                                                    <option value=\"Cuxhaven\">\n                                        Cuxhaven                                    <\/option>\n                                                                    <option value=\"Darmstadt\">\n                                        Darmstadt                                    <\/option>\n                                                                    <option value=\"Dessau\">\n                                        Dessau                                    <\/option>\n                                                                    <option value=\"Dortmund\">\n                                        Dortmund                                    <\/option>\n                                                                    <option value=\"Dresden\">\n                                        Dresden                                    <\/option>\n                                                                    <option value=\"Duisburg\">\n                                        Duisburg                                    <\/option>\n                                                                    <option value=\"D\u00fcsseldorf\">\n                                        D\u00fcsseldorf                                    <\/option>\n                                                                    <option value=\"Eisennach\">\n                                        Eisennach                                    <\/option>\n                                                                    <option value=\"Emden\">\n                                        Emden                                    <\/option>\n                                                                    <option value=\"Erfurt\">\n                                        Erfurt                                    <\/option>\n                                                                    <option value=\"Erlangen\">\n                                        Erlangen                                    <\/option>\n                                                                    <option value=\"Essen\">\n                                        Essen                                    <\/option>\n                                                                    <option value=\"Frankfurt\/Main\">\n                                        Frankfurt\/Main                                    <\/option>\n                                                                    <option value=\"Garmisch-Partenkirchen\">\n                                        Garmisch-Partenkirchen                                    <\/option>\n                                                                    <option value=\"Gera\">\n                                        Gera                                    <\/option>\n                                                                    <option value=\"G\u00f6ppingen\">\n                                        G\u00f6ppingen                                    <\/option>\n                                                                    <option value=\"G\u00f6rlitz\">\n                                        G\u00f6rlitz                                    <\/option>\n                                                                    <option value=\"G\u00f6ttingen\">\n                                        G\u00f6ttingen                                    <\/option>\n                                                                    <option value=\"Halle\/Saale\">\n                                        Halle\/Saale                                    <\/option>\n                                                                    <option value=\"Hamburg\">\n                                        Hamburg                                    <\/option>\n                                                                    <option value=\"Hamm\">\n                                        Hamm                                    <\/option>\n                                                                    <option value=\"Hanau\">\n                                        Hanau                                    <\/option>\n                                                                    <option value=\"Hannover\">\n                                        Hannover                                    <\/option>\n                                                                    <option value=\"Heidelberg\">\n                                        Heidelberg                                    <\/option>\n                                                                    <option value=\"Heilbronn\">\n                                        Heilbronn                                    <\/option>\n                                                                    <option value=\"Helmstedt\">\n                                        Helmstedt                                    <\/option>\n                                                                    <option value=\"Hildesheim\">\n                                        Hildesheim                                    <\/option>\n                                                                    <option value=\"Ingolstadt\">\n                                        Ingolstadt                                    <\/option>\n                                                                    <option value=\"Kaiserslautern\">\n                                        Kaiserslautern                                    <\/option>\n                                                                    <option value=\"Karlsruhe\">\n                                        Karlsruhe                                    <\/option>\n                                                                    <option value=\"Kassel\">\n                                        Kassel                                    <\/option>\n                                                                    <option value=\"Kiel\">\n                                        Kiel                                    <\/option>\n                                                                    <option value=\"Koblenz\">\n                                        Koblenz                                    <\/option>\n                                                                    <option value=\"K\u00f6ln\">\n                                        K\u00f6ln                                    <\/option>\n                                                                    <option value=\"Konstanz\">\n                                        Konstanz                                    <\/option>\n                                                                    <option value=\"Leipzig\">\n                                        Leipzig                                    <\/option>\n                                                                    <option value=\"Leverkusen\">\n                                        Leverkusen                                    <\/option>\n                                                                    <option value=\"Lindau\">\n                                        Lindau                                    <\/option>\n                                                                    <option value=\"Lingen\">\n                                        Lingen                                    <\/option>\n                                                                    <option value=\"L\u00fcbeck\">\n                                        L\u00fcbeck                                    <\/option>\n                                                                    <option value=\"L\u00fcdenscheid\">\n                                        L\u00fcdenscheid                                    <\/option>\n                                                                    <option value=\"Magdeburg\">\n                                        Magdeburg                                    <\/option>\n                                                                    <option value=\"Mainz\">\n                                        Mainz                                    <\/option>\n                                                                    <option value=\"Mannheim\">\n                                        Mannheim                                    <\/option>\n                                                                    <option value=\"Minden\">\n                                        Minden                                    <\/option>\n                                                                    <option value=\"M\u00f6nchengladbach\">\n                                        M\u00f6nchengladbach                                    <\/option>\n                                                                    <option value=\"M\u00fcnchen\">\n                                        M\u00fcnchen                                    <\/option>\n                                                                    <option value=\"Munster\">\n                                        Munster                                    <\/option>\n                                                                    <option value=\"M\u00fcnster\">\n                                        M\u00fcnster                                    <\/option>\n                                                                    <option value=\"Neubrandenburg\">\n                                        Neubrandenburg                                    <\/option>\n                                                                    <option value=\"Neustadt\/Weinstr.\">\n                                        Neustadt\/Weinstr.                                    <\/option>\n                                                                    <option value=\"N\u00fcrnberg\">\n                                        N\u00fcrnberg                                    <\/option>\n                                                                    <option value=\"Oberstdorf\">\n                                        Oberstdorf                                    <\/option>\n                                                                    <option value=\"Osnabr\u00fcck\">\n                                        Osnabr\u00fcck                                    <\/option>\n                                                                    <option value=\"Paderborn\">\n                                        Paderborn                                    <\/option>\n                                                                    <option value=\"Passau\">\n                                        Passau                                    <\/option>\n                                                                    <option value=\"Pforzheim\">\n                                        Pforzheim                                    <\/option>\n                                                                    <option value=\"Pirmasens\">\n                                        Pirmasens                                    <\/option>\n                                                                    <option value=\"Regensburg\">\n                                        Regensburg                                    <\/option>\n                                                                    <option value=\"Rosenheim\">\n                                        Rosenheim                                    <\/option>\n                                                                    <option value=\"Rostock\">\n                                        Rostock                                    <\/option>\n                                                                    <option value=\"R\u00fcsselsheim\">\n                                        R\u00fcsselsheim                                    <\/option>\n                                                                    <option value=\"Saarbr\u00fccken\">\n                                        Saarbr\u00fccken                                    <\/option>\n                                                                    <option value=\"Schweinfurt\">\n                                        Schweinfurt                                    <\/option>\n                                                                    <option value=\"Schwerin\">\n                                        Schwerin                                    <\/option>\n                                                                    <option value=\"Siegen\">\n                                        Siegen                                    <\/option>\n                                                                    <option value=\"Solingen\">\n                                        Solingen                                    <\/option>\n                                                                    <option value=\"Speyer\">\n                                        Speyer                                    <\/option>\n                                                                    <option value=\"Stuttgart\">\n                                        Stuttgart                                    <\/option>\n                                                                    <option value=\"Trier\">\n                                        Trier                                    <\/option>\n                                                                    <option value=\"Ulm\">\n                                        Ulm                                    <\/option>\n                                                                    <option value=\"Villingen-Schwenningen\">\n                                        Villingen-Schwenningen                                    <\/option>\n                                                                    <option value=\"Willingen\/Upland\">\n                                        Willingen\/Upland                                    <\/option>\n                                                                    <option value=\"Wittenberge\">\n                                        Wittenberge                                    <\/option>\n                                                                    <option value=\"Wuppertal\">\n                                        Wuppertal                                    <\/option>\n                                                                    <option value=\"W\u00fcrzburg\">\n                                        W\u00fcrzburg                                    <\/option>\n                                                                    <option value=\"Wetzlar\">\n                                        Wetzlar                                    <\/option>\n                                                                    <option value=\"Fulda\">\n                                        Fulda                                    <\/option>\n                                                                    <option value=\"Zwickau\">\n                                        Zwickau                                    <\/option>\n                                                            <\/select>\n                        <\/div>\n                    <\/div>\n                    \n                    <!-- Dachneigung -->\n                    <div class=\"rdc-form-group\">\n                        <label for=\"rdc-corner\" class=\"rdc-label\">Dachneigung (\u03b1) <span style=\"color: #d9534f;\">*<\/span><\/label>\n                        <div class=\"rdc-input-group\">\n                            <input \n                                type=\"text\" \n                                id=\"rdc-corner\" \n                                name=\"corner\" \n                                class=\"rdc-input\"\n                                placeholder=\"20\"\n                                required\n                            >\n                            <span class=\"rdc-suffix\">Grad<\/span>\n                        <\/div>\n                    <\/div>\n                    \n                    <!-- Sparrenl\u00e4nge -->\n                    <div class=\"rdc-form-group\">\n                        <label for=\"rdc-rafter\" class=\"rdc-label\">Sparrenl\u00e4nge (lsp) <span style=\"color: #d9534f;\">*<\/span><\/label>\n                        <div class=\"rdc-input-group\">\n                            <input \n                                type=\"text\" \n                                id=\"rdc-rafter\" \n                                name=\"rafter_length\" \n                                class=\"rdc-input\"\n                                placeholder=\"10\"\n                                required\n                            >\n                            <span class=\"rdc-suffix\">Meter<\/span>\n                        <\/div>\n                    <\/div>\n                    \n                    <!-- Hausl\u00e4nge -->\n                    <div class=\"rdc-form-group\">\n                        <label for=\"rdc-house\" class=\"rdc-label\">Hausl\u00e4nge (hl) <span style=\"color: #d9534f;\">*<\/span><\/label>\n                        <div class=\"rdc-input-group\">\n                            <input \n                                type=\"text\" \n                                id=\"rdc-house\" \n                                name=\"house_length\" \n                                class=\"rdc-input\"\n                                placeholder=\"15\"\n                                required\n                            >\n                            <span class=\"rdc-suffix\">Meter<\/span>\n                        <\/div>\n                    <\/div>\n                    \n                    <!-- Niederschlagsfl\u00e4che (readonly) -->\n                    <div class=\"rdc-form-group\">\n                        <label for=\"rdc-area\" class=\"rdc-label\">Zu entw\u00e4ssernde Dachgrundfl\u00e4che (A)<\/label>\n                        <div class=\"rdc-input-group\">\n                            <input \n                                type=\"text\" \n                                id=\"rdc-area\" \n                                name=\"precipitation_area\" \n                                class=\"rdc-input\"\n                                readonly\n                            >\n                            <span class=\"rdc-suffix\">m\u00b2<\/span>\n                        <\/div>\n                    <\/div>\n                    \n                    <!-- Fallrohrgr\u00f6\u00dfe -->\n                    <div class=\"rdc-form-group rdc-full-width rdc-downpipe-group\">\n                        <label class=\"rdc-label\">Fallrohrgr\u00f6\u00dfe<\/label>\n                        <div class=\"rdc-radio-group\">\n                                                            <div class=\"rdc-radio-item\">\n                                    <input \n                                        type=\"radio\" \n                                        id=\"rdc-dp-60\" \n                                        name=\"downpipe_size\" \n                                        value=\"60\"\n                                        checked                                    >\n                                    <label for=\"rdc-dp-60\">\n                                        \u00d860 10 tlg. RTR                                    <\/label>\n                                <\/div>\n                                                            <div class=\"rdc-radio-item\">\n                                    <input \n                                        type=\"radio\" \n                                        id=\"rdc-dp-76\" \n                                        name=\"downpipe_size\" \n                                        value=\"76\"\n                                                                            >\n                                    <label for=\"rdc-dp-76\">\n                                        \u00d876 8 tlg. RTR                                    <\/label>\n                                <\/div>\n                                                            <div class=\"rdc-radio-item\">\n                                    <input \n                                        type=\"radio\" \n                                        id=\"rdc-dp-80\" \n                                        name=\"downpipe_size\" \n                                        value=\"80\"\n                                                                            >\n                                    <label for=\"rdc-dp-80\">\n                                        \u00d880                                    <\/label>\n                                <\/div>\n                                                            <div class=\"rdc-radio-item\">\n                                    <input \n                                        type=\"radio\" \n                                        id=\"rdc-dp-87\" \n                                        name=\"downpipe_size\" \n                                        value=\"87\"\n                                                                            >\n                                    <label for=\"rdc-dp-87\">\n                                        \u00d887 7 tlg. RTR                                    <\/label>\n                                <\/div>\n                                                            <div class=\"rdc-radio-item\">\n                                    <input \n                                        type=\"radio\" \n                                        id=\"rdc-dp-100\" \n                                        name=\"downpipe_size\" \n                                        value=\"100\"\n                                                                            >\n                                    <label for=\"rdc-dp-100\">\n                                        \u00d8100 6 tlg. RTR                                    <\/label>\n                                <\/div>\n                                                            <div class=\"rdc-radio-item\">\n                                    <input \n                                        type=\"radio\" \n                                        id=\"rdc-dp-120\" \n                                        name=\"downpipe_size\" \n                                        value=\"120\"\n                                                                            >\n                                    <label for=\"rdc-dp-120\">\n                                        \u00d8120 5 tlg. RTR                                    <\/label>\n                                <\/div>\n                                                            <div class=\"rdc-radio-item\">\n                                    <input \n                                        type=\"radio\" \n                                        id=\"rdc-dp-150\" \n                                        name=\"downpipe_size\" \n                                        value=\"150\"\n                                                                            >\n                                    <label for=\"rdc-dp-150\">\n                                        \u00d8150 4 tlg. RTR                                    <\/label>\n                                <\/div>\n                                                    <\/div>\n                    <\/div>\n                    \n                <\/div>\n                \n                <!-- Illustration rechts -->\n                <div class=\"rdc-form-right\">\n                    <img decoding=\"async\" src=\"https:\/\/wus-online.de\/wp-content\/themes\/hello-theme-child-master\/roof-drainage-calculator\/images\/haus_illustration.png\" alt=\"Haus Bema\u00dfung\" class=\"rdc-illustration\">\n                <\/div>\n            <\/div>\n            \n            <div class=\"rdc-info-text\">\n                Die Berechnung erfolgt in Anlehnung an DIN 1986-100\n            <\/div>\n            \n            <!-- Checkbox -->\n            <div class=\"rdc-checkbox-group\">\n                <div class=\"rdc-checkbox-item\">\n                    <input \n                        id=\"rdc-agb\" \n                        type=\"checkbox\" \n                        name=\"agb\" \n                        value=\"1\"\n                        required\n                    >\n                    <label for=\"rdc-agb\">\n                        <strong>AGB und Nutzungsvoraussetzung akzeptiert<\/strong><br>\n                        Ich habe die die <a href=\"\/wp-content\/uploads\/2025\/11\/WUS-Allgemeine-Verkaufsbedingungen.pdf\" class=\"rdc-info-link\" download>AGB<\/a> und <a href=\"\/service\/dimensionierung-der-dachentwaesserungsanlage\/nutzungsvoraussetzung\/\" target=\"_blank\" class=\"rdc-info-link\">Nutzungsvoraussetzung<\/a> gelesen und stimme ihnen zu.\n                    <\/label>\n                <\/div>\n            <\/div>\n            \n            <!-- Submit Button -->\n            <div class=\"rdc-button-container\">\n                <button type=\"submit\" class=\"rdc-button rdc-button-primary\">\n                    Berechnen\n                <\/button>\n            <\/div>\n        <\/form>\n        \n        <!-- Ergebnisbereich - Beispielrechnung immer sichtbar -->\n        <div id=\"rdc-results\" class=\"rdc-results\">\n            <!-- Druckbarer Bereich -->\n            <div id=\"printableArea\">\n                <div class=\"rdc-header\">\n                    <h2>Berechnungs&shy;hilfe f\u00fcr die Dimen&shy;sionierung der Dach&shy;entw\u00e4sserungs&shy;anlage<\/h2>\n                <\/div>\n                \n                <div class=\"rdc-results-container\">\n                \n                <!-- Linke Seite: Ihre Angaben und Ergebnis -->\n                <div class=\"rdc-results-left\" style=\"display: none;\">\n                    <h3>Ihre Angaben<\/h3>\n                    <div class=\"rdc-user-data\">\n                        <div class=\"rdc-data-grid\">\n                            <div class=\"rdc-data-item\">\n                                <span class=\"rdc-data-label\">Standort<\/span>\n                                <span class=\"rdc-data-value\" id=\"result-city\"><\/span>\n                            <\/div>\n                            <div class=\"rdc-data-item\">\n                                <span class=\"rdc-data-label\">Dachneigung (\u03b1)<\/span>\n                                <span class=\"rdc-data-value\" id=\"result-corner\"><\/span>\n                            <\/div>\n                            <div class=\"rdc-data-item\">\n                                <span class=\"rdc-data-label\">Sparrenl\u00e4nge (lsp)<\/span>\n                                <span class=\"rdc-data-value\" id=\"result-rafter\"><\/span>\n                            <\/div>\n                            <div class=\"rdc-data-item\">\n                                <span class=\"rdc-data-label\">Hausl\u00e4nge (hl)<\/span>\n                                <span class=\"rdc-data-value\" id=\"result-house\"><\/span>\n                            <\/div>\n                            <div class=\"rdc-data-item\">\n                                <span class=\"rdc-data-label\">Fallrohrgr\u00f6\u00dfe<\/span>\n                                <span class=\"rdc-data-value\" id=\"result-downpipe-chosen\"><\/span>\n                            <\/div>\n                            <div class=\"rdc-data-item\">\n                                <span class=\"rdc-data-label\">Zu entw\u00e4ssernde Dachgrundfl\u00e4che (A)<\/span>\n                                <span class=\"rdc-data-value\" id=\"result-area\"><\/span>\n                            <\/div>\n                        <\/div>\n                    <\/div>\n                    \n                    <h3>Ergebnis auf Basis Ihrer Angaben pro Wandseite<\/h3>\n                    \n                    <div class=\"rdc-result-box\">\n                        <table class=\"rdc-result-table\">\n                            <tr>\n                                <td class=\"rdc-result-label\">Regenrohr-Menge<\/td>\n                                <td class=\"rdc-result-value\" id=\"result-given-drainpipe-number\"><\/td>\n                            <\/tr>\n                            <tr>\n                                <td class=\"rdc-result-label\">Rinnenhalter zum Fallrohr<\/td>\n                                <td class=\"rdc-result-value\" id=\"result-given-gutter-brackets\"><\/td>\n                            <\/tr>\n                        <\/table>\n                    <\/div>\n                    \n                    <div class=\"rdc-print-button\">\n                        <button type=\"button\" class=\"rdc-button rdc-button-secondary\" onclick=\"printDiv('printableArea')\">\n                            drucken\n                        <\/button>\n                    <\/div>\n                <\/div>\n                \n                <!-- Rechte Seite: Beispielrechnung - IMMER sichtbar -->\n                <div class=\"rdc-results-right\">\n                    <h3>Beispielrechnung:<\/h3>\n                    <div class=\"rdc-example-box\">\n                        <div class=\"rdc-example-content\">\n                            <div class=\"rdc-example-text\">\n                                Mehrfamilienhaus: 16-Parteien-Haus,<br>\n                                Frankfurt \/ Kelsterbach, 2019<br>\n                                Es wurden 6 tlg. Fallrohre gew\u00e4hlt.<br>\n                                Das Gef\u00e4lle betr\u00e4gt 38\u00b0.\n                            <\/div>\n                            <div class=\"rdc-example-diagram\">\n                                <img decoding=\"async\" src=\"https:\/\/wus-online.de\/wp-content\/themes\/hello-theme-child-master\/roof-drainage-calculator\/images\/beispiel_haus.jpg\" alt=\"Beispielrechnung Haus\">\n                            <\/div>\n                            <div class=\"rdc-example-note\">\n                                Aus optischen Gr\u00fcnden, sollte das Gef\u00e4lle der Rinne nicht zu gro\u00df gew\u00e4hlt werden. \n                                Max. 1mm\/m Rinne ist empfehlenswert.\n                            <\/div>\n                        <\/div>\n                    <\/div>\n                <\/div>\n                \n            <\/div>\n            <!-- Ende druckbarer Bereich -->\n        <\/div>\n        \n        <!-- Ladeanzeige -->\n        <div id=\"rdc-loading\" class=\"rdc-loading\" style=\"display: none;\">\n            <div class=\"rdc-spinner\"><\/div>\n            <p>Berechnung l\u00e4uft...<\/p>\n        <\/div>\n        \n        <!-- Fehlermeldung -->\n        <div id=\"rdc-error\" class=\"rdc-error\" style=\"display: none;\">\n            <p><\/p>\n        <\/div>\n        \n    <\/div>\n<\/div><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-73cad6f elementor-widget elementor-widget-html\" data-id=\"73cad6f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- WUS GEO \u00b7 Roof-Drainage-Sizing (EN) \u00b7 NEU sections v1.1 \u00b7 Elementor HTML-Widget \u00b7 2026-08-13 -->\n<!-- Insert as HTML widget BELOW the existing service tool. Existing content (H1, intro, calculator, example) untouched. -->\n<style>\n.wus-geo-d1{--wus-red:#B10B14;--wus-bg-soft:#F7F7F7;--wus-border:#E5E5E5;--wus-text-dark:#020101;--wus-text:#424241;color:var(--wus-text);font-family:inherit;line-height:1.6}\n.wus-geo-d1 .wus-sec{margin:34px 0}\n.wus-geo-d1 h2{font-size:1.55rem;color:var(--wus-text-dark);font-weight:700;margin:36px 0 16px;padding-bottom:10px;border-bottom:2px solid var(--wus-red)}\n.wus-geo-d1 h3{font-size:1.2rem;color:var(--wus-text-dark);font-weight:600;margin:26px 0 12px}\n.wus-geo-d1 h4{color:var(--wus-text-dark)}\n.wus-geo-d1 p{margin:10px 0}\n.wus-geo-d1 .req{color:var(--wus-red)}\n.wus-geo-d1 .unit{font-size:0.85rem;color:#666;white-space:nowrap}\n.wus-geo-d1 table{border-collapse:collapse;width:100%;margin:18px 0;font-size:0.93rem;background:#fff}\n.wus-geo-d1 table th{background:var(--wus-red);color:#fff;text-align:left;padding:11px 14px;font-weight:600;font-size:0.88rem;text-transform:uppercase;letter-spacing:0.4px}\n.wus-geo-d1 table td{padding:11px 14px;border-bottom:1px solid var(--wus-border)}\n.wus-geo-d1 table tr:nth-child(even) td{background:var(--wus-bg-soft)}\n.wus-geo-d1 .howto-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin:24px 0}\n.wus-geo-d1 .step-card{background:#fff;border:1px solid var(--wus-border);border-top:4px solid var(--wus-red);border-radius:4px;padding:22px}\n.wus-geo-d1 .step-card .step-num{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;background:var(--wus-red);color:#fff;border-radius:50%;font-weight:700;font-size:1.1rem;margin-bottom:14px}\n.wus-geo-d1 .step-card h4{font-size:1.02rem;margin:0 0 8px;font-weight:600;line-height:1.3}\n.wus-geo-d1 .step-card p{font-size:0.9rem;line-height:1.55;margin:0}\n.wus-geo-d1 .faq{border:1px solid var(--wus-border);border-radius:4px;margin:10px 0;background:#fff}\n.wus-geo-d1 .faq summary{cursor:pointer;padding:16px 22px 16px 50px;font-weight:600;color:var(--wus-text-dark);position:relative;list-style:none}\n.wus-geo-d1 .faq summary::-webkit-details-marker{display:none}\n.wus-geo-d1 .faq summary::before{content:\"+\";position:absolute;left:18px;top:50%;transform:translateY(-50%);width:24px;height:24px;background:var(--wus-red);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700}\n.wus-geo-d1 .faq[open] summary::before{content:\"\\2212\"}\n.wus-geo-d1 .faq .a{padding:0 22px 18px 50px;color:var(--wus-text);line-height:1.6}\n.wus-geo-d1 .cities-toggle{margin:8px 0 18px}\n.wus-geo-d1 .cities-toggle summary{cursor:pointer;display:inline-block;padding:10px 22px;background:#fff;border:1px solid var(--wus-red);color:var(--wus-red);border-radius:4px;font-weight:600;font-size:0.92rem;list-style:none}\n.wus-geo-d1 .cities-toggle summary::-webkit-details-marker{display:none}\n.wus-geo-d1 .cities-toggle summary::before{content:\"+\";margin-right:8px;font-weight:700}\n.wus-geo-d1 .cities-toggle[open] summary::before{content:\"\\2212\"}\n.wus-geo-d1 .cities-toggle summary:hover,.wus-geo-d1 .cities-toggle[open] summary{background:var(--wus-red);color:#fff}\n.wus-geo-d1 .cities-toggle .summary-hide{display:none}\n.wus-geo-d1 .cities-toggle[open] .summary-show{display:none}\n.wus-geo-d1 .cities-toggle[open] .summary-hide{display:inline}\n.wus-geo-d1 .crosscards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin:24px 0}\n.wus-geo-d1 .crosscard{background:#fff;border:1px solid var(--wus-border);border-radius:4px;padding:22px;text-decoration:none;color:var(--wus-text-dark);display:block}\n.wus-geo-d1 .crosscard:hover{border-color:var(--wus-red);box-shadow:0 4px 14px rgba(177,11,20,0.12)}\n.wus-geo-d1 .crosscard .arrow{color:var(--wus-red);font-size:1.4rem;font-weight:700;display:block;margin-bottom:6px}\n.wus-geo-d1 .crosscard h4{font-size:1.05rem;margin:0 0 8px}\n.wus-geo-d1 .crosscard p{font-size:0.88rem;color:#666;margin:0}\n<\/style>\n<div class=\"wus-geo-d1\">\n<section class=\"wus-sec\"><p>The sizing of roof drainage in Germany is bindingly governed by <strong>DIN 1986-100:2016-12<\/strong> (drainage systems for buildings and land \u2013 Part 100: provisions in connection with DIN EN 752 and DIN EN 12056) and by the European sizing standard <strong>DIN EN 12056-3:2001-01<\/strong>. In addition, the <strong>ZVDH code of practice<\/strong> of the German Roofing Trade applies (code of practice for waterproofing and for roofing). Proper sizing takes into account the regional design rainfall intensity, the roof plan area and the runoff coefficient. With the WUS service tool below on this page you determine the required number of downpipes and pipe nominal diameter per building side \u2013 based on the rainfall values for approx. 100 German cities.<\/p><\/section>\n<section class=\"wus-sec\"><h2>Which standards govern roof drainage in Germany?<\/h2><table><thead><tr><th>Standard<\/th><th>Edition<\/th><th>What it governs<\/th><\/tr><\/thead><tbody><tr><td><strong>DIN 1986-100<\/strong><\/td><td>2016-12<\/td><td>Drainage systems for buildings and land \u2014 sizing in connection with DIN EN 752 and DIN EN 12056. Main standard for German design.<\/td><\/tr><tr><td><strong>DIN EN 12056-3<\/strong><\/td><td>2001-01<\/td><td>Gravity drainage inside buildings \u2014 Part 3: roof drainage, planning and sizing (harmonized at European level).<\/td><\/tr><tr><td><strong>DIN EN 1462<\/strong><\/td><td>2004-12<\/td><td>Gutter brackets \u2014 requirements and testing. (Relevant for the WUS gutter-bracket range.)<\/td><\/tr><tr><td><strong>ZVDH code of practice<\/strong><\/td><td>ongoing<\/td><td>Code of practice of the German Roofing Trade (code for waterproofing, code for roofing).<\/td><\/tr><\/tbody><\/table><p>DIN 1986-100 is the leading sizing standard in Germany; it references the European DIN EN 12056-3 and supplements it with Germany-specific provisions, in particular on rainfall values (5-minute rain with a 5-year return period, <code>r(5,5)<\/code> for short).<\/p><\/section>\n<section class=\"wus-sec\"><h2>What is the design rainfall intensity r(5,5)?<\/h2><p>The design rainfall intensity <code>r(5,5)<\/code> is the maximum precipitation intensity expected within <strong>5 minutes<\/strong> that is statistically reached or exceeded once every <strong>5 years<\/strong>. It is the key variable for sizing roof drainage to DIN 1986-100 and is given in <strong>litres per second and hectare [l\/(s\u00b7ha)]<\/strong>.<\/p><h3>Where do the values come from?<\/h3><p>The rainfall values come from the <strong>KOSTRA-DWD atlas<\/strong> (coordinated heavy-precipitation regionalization of the German Weather Service, DWD). They vary regionally and are documented in DIN 1986-100 Annex A and the DWD KOSTRA maps. The WUS service tool holds values for approx. 100 German cities; for locations not listed, a KOSTRA extract is required.<\/p><h3>What role does the runoff coefficient play?<\/h3><p>The <strong>runoff coefficient C<\/strong> describes what proportion of the falling precipitation actually drains to the gutter. For pitched, smooth roofs such as metal roof tiles or clay tiles, <code>C<\/code> is close to 1.0. For intensively planted or gravel roofs, <code>C<\/code> is significantly lower (typically 0.3 to 0.5). In the tool, <code>C<\/code> is requested as an input value.<\/p><\/section>\n<section class=\"wus-sec\"><h2>Sizing roof drainage in five steps<\/h2><div class=\"howto-cards\"><div class=\"step-card\"><span class=\"step-num\">1<\/span><h4>Determine roof plan area<\/h4><p>The effective roof plan area A is determined in square metres. For steep roofs the horizontal projection of the pitched area is decisive, for flat roofs the actual area. Where several roof areas share a drainage outlet, the areas are added. Wall areas that carry water into the gutter by wind or oblique impingement are taken into account proportionally (see DIN 1986-100 Annex A).<\/p><\/div><div class=\"step-card\"><span class=\"step-num\">2<\/span><h4>Insert the regional design rainfall r(5,5)<\/h4><p>For the building location, the rainfall value is read from the DIN 1986-100 \/ KOSTRA-DWD table. Example: Berlin r(5,5) approx. 280 l\/(s\u00b7ha), Munich approx. 365, Hamburg approx. 260. For locations not in the table, a KOSTRA-DWD extract is required. The WUS service tool holds values for approx. 100 German cities.<\/p><\/div><div class=\"step-card\"><span class=\"step-num\">3<\/span><h4>Set the runoff coefficient C<\/h4><p>For pitched roofs with smooth covering (clay tiles, metal roof tiles, fibre cement) C = 1.0. For flat roofs with gravel ballast C = 0.5 to 0.8 depending on layer thickness. For green roofs C = 0.3 to 0.5 depending on build-up (extensive\/intensive). Values see DIN 1986-100 Table 9.<\/p><\/div><div class=\"step-card\"><span class=\"step-num\">4<\/span><h4>Calculate the design rainwater flow Q<\/h4><p>Q = r(5,5) \u00d7 A \u00d7 C \/ 10,000 (Q in l\/s, r in l\/(s\u00b7ha), A in m\u00b2, C dimensionless). Example: roof area 200 m\u00b2, Berlin r = 280, C = 1.0, gives Q = 280 \u00d7 200 \u00d7 1.0 \/ 10,000 = 5.6 l\/s. This value is the design rainwater flow to be drained.<\/p><\/div><div class=\"step-card\"><span class=\"step-num\">5<\/span><h4>Derive number of downpipes and pipe nominal diameter<\/h4><p>Based on the design rainwater flow Q, the required downpipe nominal diameter (DN) and number are determined in accordance with DIN 1986-100 \/ DIN EN 12056-3. Example: Q = 5.6 l\/s can be discharged by a DN 100 downpipe (capacity as per DIN 1986-100 Table 14); for larger areas several downpipes or larger nominal diameters (DN 125, DN 150) are required. The WUS service tool provides the finished sizing per building side.<\/p><\/div><\/div><p style=\"background:#fff5f5;border-left:3px solid var(--wus-red);padding:14px 18px;margin-top:18px;border-radius:0 4px 4px 0\"><strong>Note on emergency drainage:<\/strong> beyond the design rainfall, DIN 1986-100 requires emergency drainage (emergency overflow, emergency outlets) for flat roofs and roofs without sufficient fall, for hundred-year rainfall events (Jh100). The emergency drainage is sized separately (DIN 1986-100 Section 14.9).<\/p><\/section>\n<section class=\"wus-sec\"><h2>Design rainfall values for German cities (selection)<\/h2><table><thead><tr><th>City<\/th><th>r(5,5) in l\/(s\u00b7ha)<\/th><th>KOSTRA-DWD region<\/th><\/tr><\/thead><tbody><tr><td>Berlin<\/td><td>approx. 280<\/td><td>North German Lowland<\/td><\/tr><tr><td>Hamburg<\/td><td>approx. 260<\/td><td>North German Lowland (coast)<\/td><\/tr><tr><td>Munich<\/td><td>approx. 365<\/td><td>Alpine foothills<\/td><\/tr><tr><td>Schmitten i.Ts. (WUS site)<\/td><td>approx. 320<\/td><td>High Taunus<\/td><\/tr><\/tbody><\/table><details class=\"cities-toggle\"><summary><span class=\"summary-show\">Show 7 more cities<\/span><span class=\"summary-hide\">Show fewer<\/span><\/summary><table><thead><tr><th>City<\/th><th>r(5,5) in l\/(s\u00b7ha)<\/th><th>KOSTRA-DWD region<\/th><\/tr><\/thead><tbody><tr><td>Cologne<\/td><td>approx. 290<\/td><td>Lower Rhine Bay<\/td><\/tr><tr><td>Frankfurt\/Main<\/td><td>approx. 295<\/td><td>Rhine-Main<\/td><\/tr><tr><td>Stuttgart<\/td><td>approx. 330<\/td><td>Central Uplands \/ Swabian Alb<\/td><\/tr><tr><td>Leipzig<\/td><td>approx. 275<\/td><td>Central German Lowland<\/td><\/tr><tr><td>Hannover<\/td><td>approx. 270<\/td><td>North German Lowland<\/td><\/tr><tr><td>Nuremberg<\/td><td>approx. 305<\/td><td>Franconian Basin<\/td><\/tr><tr><td>Dresden<\/td><td>approx. 285<\/td><td>Saxon Hill Country<\/td><\/tr><\/tbody><\/table><\/details><p style=\"font-size:0.88rem;color:#888\"><em>Full list of the approx. 100 stored cities available in the tool above.<\/em><\/p><\/section>\n<section class=\"wus-sec\"><h2>Matching WUS products for the calculated sizing<\/h2><div class=\"crosscards\"><a class=\"crosscard\" href=\"https:\/\/wus-online.de\/en\/products\/roof-drainage\/gutter-bracket\/\"><span class=\"arrow\">\u2192<\/span><h4>Gutter brackets for the calculated nominal diameter<\/h4><p>For the gutter nominal diameter determined in the tool, WUS offers regionally differentiated gutter-bracket designs (Munich style, North German style, half-round with\/without reinforcing bead, box-shaped, clad, flange bracket).<\/p><\/a><a class=\"crosscard\" href=\"https:\/\/wus-online.de\/en\/products\/roof-drainage\/downpipe-clamps\/\"><span class=\"arrow\">\u2192<\/span><h4>Downpipe clamps and downpipe accessories<\/h4><p>The determined downpipe nominal diameter (DN 80, DN 100, DN 125, DN 150) is fixed using the WUS downpipe-clamp and downpipe-accessory range.<\/p><\/a><a class=\"crosscard\" href=\"https:\/\/wus-online.de\/en\/service\/snow-load-calculation\/\"><span class=\"arrow\">\u2192<\/span><h4>Snow guard system to DIN EN 1991-1-3 (for steep roofs)<\/h4><p>For steep roofs in a snow-load region (DIN EN 1991-1-3), a snow guard system must be planned alongside the roof drainage. WUS snow guard supports can be sized with the snow-load service tool.<\/p><\/a><\/div><\/section>\n<section class=\"wus-sec\"><h2>Frequently asked questions<\/h2><details class=\"faq\"><summary>What is the design rainfall intensity r(5,5) and where does the value come from?<\/summary><div class=\"a\">The design rainfall intensity r(5,5) is the 5-minute rain with a 5-year return period \u2014 i.e. the precipitation intensity statistically reached once every 5 years within 5 minutes. It is given in litres per second and hectare [l\/(s\u00b7ha)] and is the central input variable for sizing to DIN 1986-100. The regional values come from the KOSTRA-DWD atlas of the German Weather Service; for Germany they are documented in DIN 1986-100 Annex A and the DWD KOSTRA maps.<\/div><\/details><details class=\"faq\"><summary>Which standard applies in Germany for roof-drainage sizing?<\/summary><div class=\"a\">In Germany, DIN 1986-100:2016-12 applies as the main standard. It is embedded in the European DIN EN 12056-3:2001-01 and supplements it with Germany-specific provisions. In addition, the ZVDH code of practice of the German Roofing Trade applies (code for waterproofing and for roofing) as well as, for gutter brackets, the construction-product standard DIN EN 1462.<\/div><\/details><details class=\"faq\"><summary>How do I calculate the design rainwater flow Q?<\/summary><div class=\"a\">The design rainwater flow Q is given by Q = r(5,5) \u00d7 A \u00d7 C \/ 10,000, where r(5,5) is the regional rainfall intensity in l\/(s\u00b7ha), A the effective roof plan area in m\u00b2 and C the runoff coefficient. For Berlin (r approx. 280), a roof area of 200 m\u00b2 and a steep roof (C = 1.0), Q = 5.6 l\/s. This flow must be discharged via gutter and downpipes.<\/div><\/details><details class=\"faq\"><summary>Do I need emergency drainage for flat roofs?<\/summary><div class=\"a\">Yes. DIN 1986-100 (Section 14.9) requires, for flat roofs and roofs without sufficient fall, emergency drainage sized separately from the design rainfall. It safeguards the building against hundred-year rainfall events (Jh100). Emergency outlets and overflows are installed in addition to the main drainage and are excluded from the design rainfall.<\/div><\/details><details class=\"faq\"><summary>Which runoff coefficient C applies to which roof?<\/summary><div class=\"a\">For pitched roofs with smooth covering (clay tiles, metal roof tiles, fibre cement) C = 1.0. Flat roofs with gravel ballast have C = 0.5 to 0.8 (depending on layer thickness). Extensive green roofs have C = 0.3 to 0.5, intensive green roofs C = 0.1 to 0.3 (DIN 1986-100 Table 9). For very low coefficients, the storage effect of the substrate layer must also be considered.<\/div><\/details><details class=\"faq\"><summary>How does roof drainage work on an ETICS (external thermal insulation) facade?<\/summary><div class=\"a\">For ETICS facades, fixing the gutter brackets and downpipe clamps requires load anchoring through the insulation into the load-bearing substructure. WUS offers special thermal-insulation anchor solutions that anchor the gutter brackets through the insulation thickness without thermal-bridge loss. A detailed application guide follows in a dedicated ETICS sub-page.<\/div><\/details><\/section>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Properly dimensioning roof drainage Our service tool supports you in the reliable planning of your system. Dimensioning of the Roof Drainage System Stay up-to-date. Which downpipe (and how many per wall side?) do I need for my construction project?What does this mean for the selection of suitable gutter brackets up to the next drainage line [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1277,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1284","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/wus-online.de\/en\/wp-json\/wp\/v2\/pages\/1284","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wus-online.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/wus-online.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/wus-online.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wus-online.de\/en\/wp-json\/wp\/v2\/comments?post=1284"}],"version-history":[{"count":0,"href":"https:\/\/wus-online.de\/en\/wp-json\/wp\/v2\/pages\/1284\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/wus-online.de\/en\/wp-json\/wp\/v2\/pages\/1277"}],"wp:attachment":[{"href":"https:\/\/wus-online.de\/en\/wp-json\/wp\/v2\/media?parent=1284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}