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<?xml-stylesheet type="text/xsl" href="https://communities.bentley.com/cfs-file/__key/system/syndication/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>Stormwater Drainage Subcatchment characteristic width &amp;amp; Slope</title><link>https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/217913/stormwater-drainage-subcatchment-characteristic-width-slope</link><description>Greetings, 
 We are working on Urban drainage design using SewerGEMS latest version of 10.03.04.53 with Explicit solver &amp;amp; EPASWMM runoff method. In which the catchment characteristic width &amp;amp; slope are inputs to the model (shown in below screenshot). Is</description><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>RE: Stormwater Drainage Subcatchment characteristic width &amp; Slope</title><link>https://communities.bentley.com/thread/665624?ContentTypeID=1</link><pubDate>Tue, 10 Aug 2021 19:29:34 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:46f30b96-8a8b-49d1-92ef-1a795d5158f4</guid><dc:creator>Jesse Dringoli</dc:creator><description>&lt;p&gt;Currently the Characteristic Width and Slope fields for catchments when using the EPA-SWMM runoff method must be entered by the user or imported via ModelBuilder from an external data source.&amp;nbsp;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Stormwater Drainage Subcatchment characteristic width &amp; Slope</title><link>https://communities.bentley.com/thread/665622?ContentTypeID=1</link><pubDate>Tue, 10 Aug 2021 19:05:02 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:21430c08-3bd9-4869-a37a-8cdf36841e8a</guid><dc:creator>GANESH BALA S</dc:creator><description>&lt;p&gt;Hi Sushma,&lt;/p&gt;
&lt;p&gt;Thank you for the above information, we will check with SWMM manuals.&lt;/p&gt;
&lt;p&gt;Could you please suggest whether it is possible to generate these parameters (characteristic width &amp;amp; slope) in SewerGEMS software?&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;Regards&lt;/p&gt;
&lt;p&gt;Ganesh Bala S&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Stormwater Drainage Subcatchment characteristic width &amp; Slope</title><link>https://communities.bentley.com/thread/665575?ContentTypeID=1</link><pubDate>Tue, 10 Aug 2021 14:13:21 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:899fac02-19bb-463b-ae12-1b6e48085447</guid><dc:creator>Jesse Dringoli</dc:creator><description>&lt;p&gt;To add to Sushma&amp;#39;s reply - generally speaking you can see a short description of input fields by clicking on them in the Property grid and looking at the bottom. See: &lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/26029/where-can-i-find-the-definition-of-a-property"&gt;Where can I find the definition of a property?&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;As Sushma mentioned, these particular inputs are based on the standard EPA-SWMM runoff method and are needed in order to compute the runoff hydrograph. You can see more information specifically about SWMM runoff in chapter 3 of the Hydrology manual (download found on &lt;a href="https://www.epa.gov/water-research/storm-water-management-model-swmm"&gt;this page&lt;/a&gt;)&lt;/p&gt;
&lt;p&gt;If you&amp;#39;re still not sure how to determine these parameters, you may want to consider if this is the right runoff method for you. Your local reviewer may require a certain runoff method, and you may find that the Unit Hydrograph method for example may be better, especially if it&amp;#39;s required parameters and storm information are more readily available to you.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Stormwater Drainage Subcatchment characteristic width &amp; Slope</title><link>https://communities.bentley.com/thread/665548?ContentTypeID=1</link><pubDate>Tue, 10 Aug 2021 11:57:47 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ab0ede9f-3c8e-4245-919c-94a589b36bd3</guid><dc:creator>Sushma Choure</dc:creator><description>&lt;p&gt;Hello Ganesh,&amp;nbsp;&lt;/p&gt;
&lt;p&gt;EPA-SWMM runoff method is taken from EPA-SWMM so you can find more information on that&amp;nbsp;method in&amp;nbsp;&lt;span&gt;SWMM hydrology reference manual, which you can download here;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;a title="Storm Water Management Model (SWMM)" href="https://www.epa.gov/water-research/storm-water-management-model-swmm#downloads" rel="noopener noreferrer" target="_blank"&gt;Storm Water Management Model (SWMM)&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;Additionally, please see the following article for more information. It is focused around differences between the unit hydrograph and SWMM runoff methods, but there are some links included that you may find useful.&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/43834/results-different-between-unit-hydrograph-and-epa-swmm-runoff-methods"&gt;Results Different between Unit Hydrograph and EPA-SWMM Runoff Methods&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;For non-zero values of these fields error will be generated.&amp;nbsp;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>