<?xml version="1.0" encoding="UTF-8" ?>
<?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/"><channel><title>Modeling a flow split (diversion) in SewerGEMS or CivilStorm</title><link>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm</link><description /><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>Modeling a flow split (diversion) in SewerGEMS or CivilStorm</title><link>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm</link><pubDate>Thu, 21 Mar 2019 07:07:39 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ed01d4f0-5069-4091-a392-43df814789ed</guid><dc:creator>Yashodhan Joshi</dc:creator><comments>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm#comments</comments><description>Current Revision posted to OpenFlows | Water Infrastructure Wiki by Yashodhan Joshi on 3/21/2019 7:07:39 AM&lt;br /&gt;
&lt;table style="background-color:#dce5f0;border:0px solid #dce5f0;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;SewerGEMS, CivilStorm&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;08.11.XX.XX, 10.00.00.XX&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Modeling&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;
&lt;p&gt;&lt;/p&gt;
&lt;h1&gt;Problem&lt;/h1&gt;
&lt;p&gt;How can I model a flow split / diversion, where a control structure such as a weir or orifice plate controls the split?&lt;/p&gt;
&lt;h1&gt;Solution&lt;/h1&gt;
&lt;p&gt;Using the Implicit or Explicit dynamic solver in SewerGEMS or CivilStorm, you can model a diversion as follows:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;1) Multiple conduits leaving a junction/manhole&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, the hydraulics of the flow split are controlled by the implicit solver based on the size and invert of the downstream conduits&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;2) Conduit control structures&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, a weir or orifice can be modeled with a start control structure on the adjacent conduit(s). When doing this, the results may be unstable or very sensitive due to the relative large change in flow that tends to occur for a relatively small change in head with such control structures. So, you may need to use a very small calculation timestep, or use the Explicit (SWMM) solver with a small Routing Timestep (such as 1-5 seconds).&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;3) Pond&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;A diversion can be modeled as a pond with multiple pond outlet structures. The pond&amp;#39;s elevation-area or elevation-volume table would be configured to represent the volume of the chamber that the flow diverts away from. If the chamber can become pressurized, consider adding a skinny &amp;quot;chimney&amp;quot; to the elevation-volume curve (tiny increase in volume for elevations above the physical top of the chamber, to allow surcharging without additional storage effects). This option may not work as well if the diversion chamber size is very small, as you will be more at risk for stability issues. You might need to use the Explicit (SWMM) solver with a one second Routing Timestep.&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;h1&gt;See Also&lt;/h1&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/30532.is-it-possible-to-model-a-weir-within-a-catch-basin-or-manhole-in-the-the-storm-sewer-haestad-products"&gt;Is it possible to model a weir within a catch basin or manhole in the the storm-sewer OpenFlows products?&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8582.modeling-a-flow-split-diversion-with-the-sewercad-or-stormcad-numerical-solver"&gt;Modeling a flow split (diversion) with the SewerCAD or StormCAD numerical solver&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/21403.troubleshooting-unstable-sewergems-and-civilstorm-results-using-the-implicit-solver"&gt;Troubleshooting unstable SewerGEMS and CivilStorm results using the implicit solver&lt;/a&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: Diversion, control structure, SewerGEMS, Flow Split, Orifice Plate, Weir plate, CivilStorm&lt;/div&gt;
</description></item><item><title>Modeling a flow split (diversion) in SewerGEMS or CivilStorm</title><link>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm/revision/4</link><pubDate>Thu, 23 Mar 2017 20:06:25 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ed01d4f0-5069-4091-a392-43df814789ed</guid><dc:creator>Jesse Dringoli</dc:creator><comments>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm#comments</comments><description>Revision 4 posted to OpenFlows | Water Infrastructure Wiki by Jesse Dringoli on 3/23/2017 8:06:25 PM&lt;br /&gt;
&lt;p style="padding:0;margin:0;"&gt;&lt;/p&gt;
&lt;table style="border:0px solid #dce5f0;background-color:#dce5f0;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;SewerGEMS, CivilStorm&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;08.11.XX.XX, 10.00.00.XX&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Modeling&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;
&lt;p&gt;&lt;/p&gt;
&lt;h1&gt;Problem&lt;/h1&gt;
&lt;p&gt;How can I model a flow split / diversion, where a control structure such as a weir or orifice plate controls the split?&lt;/p&gt;
&lt;h1&gt;Solution&lt;/h1&gt;
&lt;p&gt;Using the Implicit or Explicit dynamic solver in SewerGEMS or CivilStorm, you can model a diversion as follows:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;1) Multiple conduits leaving a junction/manhole&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, the hydraulics of the flow split are controlled by the implicit solver based on the size and invert of the downstream conduits&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;2) Conduit control structures&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, a weir or orifice can be modeled with a start control structure on the adjacent conduit(s). When doing this, the results may be unstable or very sensitive due to the relative large change in flow that tends to occur for a relatively small change in head with such control structures. So, you may need to use a very small calculation timestep, or use the Explicit (SWMM) solver with a small Routing Timestep (such as 1-5 seconds).&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;3) Pond&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;A diversion can be modeled as a pond with multiple pond outlet structures. The pond&amp;#39;s elevation-area or elevation-volume table would be configured to represent the volume of the chamber that the flow diverts away from. If the chamber can become pressurized, consider adding a skinny &amp;quot;chimney&amp;quot; to the elevation-volume curve (tiny increase in volume for elevations above the physical top of the chamber, to allow surcharging without additional storage effects). This option may not work as well if the diversion chamber size is very small, as you will be more at risk for stability issues. You might need to use the Explicit (SWMM) solver with a one second Routing Timestep.&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;h1&gt;See Also&lt;/h1&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/30532.is-it-possible-to-model-a-weir-within-a-catch-basin-or-manhole-in-the-the-storm-sewer-haestad-products"&gt;Is it possible to model a weir within a catch basin or manhole in the the storm-sewer Haestad products?&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8582.modeling-a-flow-split-diversion-with-the-sewercad-or-stormcad-numerical-solver"&gt;Modeling a flow split (diversion) with the SewerCAD or StormCAD numerical solver&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/21403.troubleshooting-unstable-sewergems-and-civilstorm-results-using-the-implicit-solver"&gt;Troubleshooting unstable SewerGEMS and CivilStorm results using the implicit solver&lt;/a&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: Diversion, control structure, SewerGEMS, Flow Split, Orifice Plate, Weir plate, CivilStorm&lt;/div&gt;
</description></item><item><title>Modeling a flow split (diversion) in SewerGEMS or CivilStorm</title><link>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm/revision/3</link><pubDate>Thu, 23 Mar 2017 20:06:10 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ed01d4f0-5069-4091-a392-43df814789ed</guid><dc:creator>Jesse Dringoli</dc:creator><comments>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm#comments</comments><description>Revision 3 posted to OpenFlows | Water Infrastructure Wiki by Jesse Dringoli on 3/23/2017 8:06:10 PM&lt;br /&gt;
&lt;p style="padding:0;margin:0;"&gt;&lt;/p&gt;
&lt;table style="border:0px solid #dce5f0;background-color:#dce5f0;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;SewerGEMS, CivilStorm&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;08.11.XX.XX, 10.00.00.XX&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Modeling&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;
&lt;p&gt;&lt;/p&gt;
&lt;h1&gt;Problem&lt;/h1&gt;
&lt;p&gt;How can I model a flow split / diversion, where a control structure such as a weir or orifice plate controls the split?&lt;/p&gt;
&lt;h1&gt;Solution&lt;/h1&gt;
&lt;p&gt;Using the Implicit or Explicit dynamic solver in SewerGEMS or CivilStorm, you can model a diversion as follows:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;1) Multiple conduits leaving a junction/manhole&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, the hydraulics of the flow split are controlled by the implicit solver based on the size and invert of the downstream conduits&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;2) Conduit control structures&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, a weir or orifice can be modeled with a start control structure on the adjacent conduit(s). When doing this, the results may be unstable or very sensitive due to the relative large change in flow that tends to occur for a relatively small change in head with such control structures. So, you may need to use a very small calculation timestep, or use the Explicit (SWMM) solver with a small Routing Timestep (such as 1-5 seconds).&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;3) Pond&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;A diversion can be modeled as a pond with multiple pond outlet structures. The pond&amp;#39;s elevation-area or elevation-volume table would be configured to represent the volume of the chamber that the flow diverts away from. If the chamber can become pressurized, consider adding a skinny &amp;quot;chimney&amp;quot; to the elevation-volume curve (tiny increase in volume for elevations above the physical top of the chamber, to allow surcharging without additional storage effects). This option may not work as well if the diversion chamber size is very small, as you will be more at risk for stability issues. You might need to use the Explicit (SWMM) solver with a one second Routing Timestep.&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;h1&gt;See Also&lt;/h1&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/30532.is-it-possible-to-model-a-weir-within-a-catch-basin-or-manhole-in-the-the-storm-sewer-haestad-products"&gt;Is it possible to model a weir within a catch basin or manhole in the the storm-sewer Haestad products?&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8582.modeling-a-flow-split-diversion-with-the-sewercad-or-stormcad-numerical-solver"&gt;Modeling a flow split (diversion) with the SewerCAD or StormCAD numerical solver&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/21403.troubleshooting-unstable-sewergems-and-civilstorm-results-using-the-implicit-solver"&gt;Troubleshooting unstable SewerGEMS and CivilStorm results using the implicit solver&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;This is very useful, Please explain further on the configuration of the pond volume-type&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: Diversion, control structure, SewerGEMS, Flow Split, Orifice Plate, Weir plate, CivilStorm&lt;/div&gt;
</description></item><item><title>Modeling a flow split (diversion) in SewerGEMS or CivilStorm</title><link>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm/revision/2</link><pubDate>Thu, 23 Mar 2017 18:53:23 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ed01d4f0-5069-4091-a392-43df814789ed</guid><dc:creator>peter wereh</dc:creator><comments>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm#comments</comments><description>Revision 2 posted to OpenFlows | Water Infrastructure Wiki by peter wereh on 3/23/2017 6:53:23 PM&lt;br /&gt;
&lt;p style="padding:0;margin:0;"&gt;&lt;/p&gt;
&lt;table style="border:0px solid #dce5f0;background-color:#dce5f0;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;SewerGEMS, CivilStorm&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;08.11.XX.XX, 10.00.00.XX&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Modeling&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;
&lt;p&gt;&lt;/p&gt;
&lt;h1&gt;Problem&lt;/h1&gt;
&lt;p&gt;How can I model a flow split / diversion, where a control structure such as a weir or orifice plate controls the split?&lt;/p&gt;
&lt;h1&gt;Solution&lt;/h1&gt;
&lt;p&gt;Using the Implicit or Explicit dynamic solver in SewerGEMS or CivilStorm, you can model a diversion as follows:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;1) Multiple conduits leaving a junction/manhole&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, the hydraulics of the flow split are controlled by the implicit solver based on the size and invert of the downstream conduits&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;2) Conduit control structures&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, a weir or orifice can be modeled with a start control structure on the adjacent conduit(s). When doing this, the results may be unstable or very sensitive due to the relative large change in flow that tends to occur for a relatively small change in head with such control structures. So, you may need to use a very small calculation timestep, or use the Explicit (SWMM) solver with a small Routing Timestep (such as 1-5 seconds).&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;3) Pond&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;A diversion can be modeled as a pond with multiple pond outlet structures.&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png"&gt;&lt;img alt=" " src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;h1&gt;See Also&lt;/h1&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/30532.is-it-possible-to-model-a-weir-within-a-catch-basin-or-manhole-in-the-the-storm-sewer-haestad-products"&gt;Is it possible to model a weir within a catch basin or manhole in the the storm-sewer Haestad products?&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8582.modeling-a-flow-split-diversion-with-the-sewercad-or-stormcad-numerical-solver"&gt;Modeling a flow split (diversion) with the SewerCAD or StormCAD numerical solver&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/21403.troubleshooting-unstable-sewergems-and-civilstorm-results-using-the-implicit-solver"&gt;Troubleshooting unstable SewerGEMS and CivilStorm results using the implicit solver&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;This is very useful, Please explain further on the configuration of the pond volume-type&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: Diversion, control structure, SewerGEMS, Flow Split, Orifice Plate, Weir plate, CivilStorm&lt;/div&gt;
</description></item><item><title>Modeling a flow split (diversion) in SewerGEMS or CivilStorm</title><link>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm/revision/1</link><pubDate>Thu, 26 Jan 2017 21:03:51 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ed01d4f0-5069-4091-a392-43df814789ed</guid><dc:creator>Jesse Dringoli</dc:creator><comments>https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/32679/modeling-a-flow-split-diversion-in-sewergems-or-civilstorm#comments</comments><description>Revision 1 posted to OpenFlows | Water Infrastructure Wiki by Jesse Dringoli on 1/26/2017 9:03:51 PM&lt;br /&gt;
&lt;p style="padding:0;margin:0;"&gt;&lt;/p&gt;
&lt;table style="border:0px solid #dce5f0;background-color:#dce5f0;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;SewerGEMS, CivilStorm&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;08.11.XX.XX, 10.00.00.XX&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Modeling&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;
&lt;p&gt;&lt;/p&gt;
&lt;h1&gt;Problem&lt;/h1&gt;
&lt;p&gt;How can I model a flow split / diversion, where a control structure such as a weir or orifice plate controls the split?&lt;/p&gt;
&lt;h1&gt;Solution&lt;/h1&gt;
&lt;p&gt;Using the Implicit or Explicit dynamic solver in SewerGEMS or CivilStorm, you can model a diversion as follows:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;1) Multiple conduits leaving a junction/manhole&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, the hydraulics of the flow split are controlled by the implicit solver based on the size and invert of the downstream conduits&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png"&gt;&lt;img src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split1.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;2) Conduit control structures&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;In this case, a weir or orifice can be modeled with a start control structure on the adjacent conduit(s). When doing this, the results may be unstable or very sensitive due to the relative large change in flow that tends to occur for a relatively small change in head with such control structures. So, you may need to use a very small calculation timestep, or use the Explicit (SWMM) solver with a small Routing Timestep (such as 1-5 seconds).&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png"&gt;&lt;img src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split2.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;3) Pond&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;A diversion can be modeled as a pond with multiple pond outlet structures.&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png"&gt;&lt;img src="/resized-image/__size/940x0/__key/communityserver-wikis-components-files/00-00-00-00-32/Split3.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;h1&gt;See Also&lt;/h1&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/30532.is-it-possible-to-model-a-weir-within-a-catch-basin-or-manhole-in-the-the-storm-sewer-haestad-products"&gt;Is it possible to model a weir within a catch basin or manhole in the the storm-sewer Haestad products?&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8582.modeling-a-flow-split-diversion-with-the-sewercad-or-stormcad-numerical-solver"&gt;Modeling a flow split (diversion) with the SewerCAD or StormCAD numerical solver&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/21403.troubleshooting-unstable-sewergems-and-civilstorm-results-using-the-implicit-solver"&gt;Troubleshooting unstable SewerGEMS and CivilStorm results using the implicit solver&lt;/a&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: Diversion, control structure, SewerGEMS, Flow Split, Orifice Plate, Weir plate, CivilStorm&lt;/div&gt;
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