{"id":122691,"date":"2013-08-26T06:00:22","date_gmt":"2013-08-26T06:00:22","guid":{"rendered":"http:\/\/www.esri.com\/arcgis-blog\/products\/product\/uncategorized\/urban-hydrology-modeling-using-gis\/"},"modified":"2013-08-26T06:00:22","modified_gmt":"2013-08-26T06:00:22","slug":"urban-hydrology-modeling-using-gis","status":"publish","type":"blog","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/product\/water\/urban-hydrology-modeling-using-gis","title":{"rendered":"Urban Hydrology Modeling Using GIS"},"author":4911,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":""},"categories":[23051],"tags":[37731,39381,24981,23371,34151,39501,37771,23411,37781],"industry":[],"product":[],"class_list":["post-122691","blog","type-blog","status-publish","format-standard","hentry","category-water","tag-arc-hydro","tag-catchment","tag-hydro","tag-hydrology","tag-modeling","tag-topology","tag-water","tag-water-resources","tag-watershed"],"acf":{"short_description":"By Victor de Loza &amp; Nahm H. Lee, Ph.D., Santa Clara Valley Water District\n\nSubcatchment delineation is an essential step for watershe...","flexible_content":[{"acf_fc_layout":"content","content":"<p><strong>By Victor de Loza &amp; Nahm H. Lee, Ph.D., Santa Clara Valley Water District<\/strong><\/p>\n<p><a href=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2013\/08\/thumb1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-30803\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2013\/08\/thumb1.jpg\" alt=\"Santa Clara Valley Water District\" width=\"150\" height=\"95\" \/><\/a>Subcatchment delineation is an essential step for watershed modeling studies. Flow directions can be changed by roads, artificial surfaces, and storm drains. Urban subcatchment delineation is challenging since the flow direction in the drainage network not always aligns with the topography of the surface. Fortunately, Geographic Information Systems (GIS) tools can help you delineate urban subcatchments.<\/p>\n<p>&nbsp;<\/p>\n<p>One of the challenges you might face during the delineation phase is <!--more-->the cleanup of your data. To reduce the amount of work you need to do you might want to identify the contributing drainage network to your area of interest first.<\/p>\n<p>To identify the contributing drainage network you can use the <em>Join Tables<\/em> function to connect manholes to pipes, pipes to outfalls, outfalls to &#8220;Water Way\u201d of interest (i.e. creek, river). Then you can use the <em>Select by Attributes<\/em> tool on the joined features. The figure below shows the contributing drainage network to the creek or interest below.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-30801\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2013\/08\/fig11.jpg\" alt=\"Contributing drainage network to the creek.\" width=\"500\" height=\"290\" \/><\/p>\n<p>Next you can identify and correct problems in the drainage network by using the <em>Utility Network<\/em> tools to create\u00a0 a <em>Geometric Network<\/em>. Once the Geometric Network is created you can set flags to perform various tasks including: identify loops, find path, and find connected.<\/p>\n<p>Once you had identified some of the issues with your drainage network you can correct them by creating a topology. While setting up the topology you will be able to implement a set of rules (pipes must not overlap, or intersect and so on). The <em>Error Inspector<\/em> can help you implement a solution to topology errors in your data.<\/p>\n<p>After cleaning up your data you are ready to delineate some preliminary subcatchments considering the drainage network!<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Arc Hydro tools can delineate urban subcatchments.<\/strong><br \/>\nArc Hydro tools are very straight forward to use, you can delineate subcatchments by reconditioning your Digital Elevation Model (DEM) to consider the drainage network, filling sinks, finding the direction and accumulation of flow, defining and segmenting streams, and processing both catchment polygons and drainage points. After all the tasks in the precedent list are complete you can run the <em>Batch Watershed Delineation<\/em> tool to finally identify the subcatments in your area of interest. The figure below shows the final subcatchment delination.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-30802\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2013\/08\/fig2.jpg\" alt=\"Final subcatchment delineation.\" width=\"498\" height=\"289\" \/><\/p>\n<p>If you have questions about this blog please contact <a href=\"mailto:v.deloza@gmail.com\">Victor de Loza<\/a>.<\/p>\n"}],"authors":[{"ID":4911,"user_firstname":"Caitlin","user_lastname":"Scopel","nickname":"Caitlin Scopel","user_nicename":"coscopel","display_name":"Caitlin Scopel","user_email":"CScopel@esri.com","user_url":"","user_registered":"2018-03-02 00:16:31","user_description":"Senior Project Manager for the ArcGIS Living Atlas of the World Environment Team. Caitlin works on projects that utilize environmental data from local, state, national and global institutions.","user_avatar":"<img data-del=\"avatar\" src='https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2019\/04\/G68235_CaitlinScopel_22-150x150.jpg' class='avatar pp-user-avatar avatar-96 photo ' height='96' width='96'\/>"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Urban Hydrology Modeling Using GIS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.esri.com\/arcgis-blog\/products\/product\/water\/urban-hydrology-modeling-using-gis\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Urban Hydrology Modeling Using GIS\" \/>\n<meta property=\"og:url\" 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