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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/"><channel><title>Brian White's Activities</title><link>https://communities.bentley.com/members/0cd07019_2d00_b7ef_2d00_4e79_2d00_9d0e_2d00_4a6f51a2b05c</link><description>Brian White's recent activity</description><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>Manifold Force Mains with Many Pumps</title><link>https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/213112/manifold-force-mains-with-many-pumps</link><pubDate>Tue, 27 Apr 2021 01:16:47 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:3f0a9b5b-85f7-4522-84f0-1b0642066e49</guid><dc:creator>Brian White</dc:creator><description>&lt;p&gt;I&amp;#39;m working in a coastal community where the terrain is very flat and therefore they don&amp;#39;t have much gravity and they use a lot of pumping stations. They have 100&amp;#39;s of duplex submersible pump stations and 1000&amp;#39;s of individual grinder pumps that all pump in common force mains, some of which even reverse directions under various operating conditions. The system even has several in-line sewer booster pumping stations along the force mains. They have multiple treatment facilities and use the in-line booster PS to try and move flow to various treatment plants to optimize available capacity. The in-line boosters also serve to shift the &amp;#39;natural&amp;#39; hydraulic breaks in the system to alleviate some areas where the head conditions get too high pushing the pumps back on their curves.&amp;nbsp;&lt;/p&gt;
&lt;p&gt;I want to model this complex system but I&amp;#39;m researching the best solutions. Is this best handled in a water modeling software or wastewater? And what level of detail is necessary to really provide the most benefit for the model? We would like to use this for operational modeling to evaluate transfer flow in different directions and optimize the system, as well as evaluate the impacts from future connections. Do we need to model detailed pump curves for all the duplex PS, and wet wells with controls for a EPS model? How important are the air valves in the system? Or is it possible to simplify the system? And how do you account for the smaller individual grinders which are just small PD pumps that pump at relatively fixed flows under higher head conditions? They do have good SCADA data on many of the duplex PS and pressure points within the system to help validate a model.&lt;/p&gt;
&lt;p&gt;Any users out there with experience in modeling a similar system? Or any thoughts on water vs. sewer software for this application and the level of detail needed to provide optimum benefit for operational modeling?&lt;/p&gt;
&lt;p&gt;Thanks,&lt;/p&gt;
&lt;p&gt;-Brian&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>System Head Curve</title><link>https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/203098/system-head-curve</link><pubDate>Sun, 13 Sep 2020 13:06:06 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:41d092b1-909b-4b37-8e2c-19654865af09</guid><dc:creator>Brian White</dc:creator><description>&lt;p&gt;In generating system heads curves for an in-line booster PS I&amp;#39;m getting results that show a odd curve where the head actually reduces at higher flows under certain time steps in my EPS model.&amp;nbsp; The elevated storage tanks in this system are all at the same overflow, on both the suction and discharge of the PS, but we are pumping to an area further at the extreme ends of the system.&amp;nbsp; There are several elevated storage tanks on both sides of the PS.&amp;nbsp; What I have found is that the time steps when the system curve has this odd behavior is at times when the tank on the discharge side of the PS, closest to the PS, is completely (does the model automatically assume an altitude valve in this instance?).&amp;nbsp; I still cannot explain why the system curve behaves this way even with the downstream tank full.&amp;nbsp; I&amp;#39;ve attached a picture of the system head curves, I&amp;#39;ve generated several for various time steps, so some of the them look typical, but seven or so that don&amp;#39;t are all in a period of the EPS with that tank completely full.&amp;nbsp; I appreciate any help on these system curves.&lt;/p&gt;
&lt;p&gt;Thanks, -Brian&lt;/p&gt;
&lt;p&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-discussions-components-files/5925/pastedimage1600002328546v2.png" alt=" " /&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Air Valve Ingress/Egress Flowrates</title><link>https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/196021/air-valve-ingress-egress-flowrates</link><pubDate>Wed, 22 Apr 2020 18:26:54 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:9f952147-bacc-4fed-a6ef-a7c77b9c36f2</guid><dc:creator>Brian White</dc:creator><description>&lt;p&gt;&lt;span&gt;I have a question regarding the TechNote on Air Valve elements. (&lt;/span&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/3400/modeling-reference---air-valves"&gt;https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/3400/modeling-reference---air-valves&lt;/a&gt;&lt;span&gt;)&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;Specifically the section on Reporting and the Transient Analysis Output Log.&amp;nbsp; I see this provides results for the CURR. FLW# which is defined in the note as the flow through the end point at the end of the transient simulation (last time step, current flow).&amp;nbsp; Is this information available somewhere for different time steps in the calculation?&amp;nbsp; Interested in learning the maximum flowrate of air into and out of an ARV during the simulation.&amp;nbsp; Is this information available in the reporting somewhere?&amp;nbsp; I assume this is the information provided in the Transient Analysis Output Log?&amp;nbsp; But this information is air flow in the pipeline and not free-air at the valve opening?&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;I also found a previous discussion on this topic that is now locked (&lt;a href="/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/145265/follow-up-to-service-request-7000721384-pertaining-to-air-ingress-velocity/441438#441438"&gt;https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/145265/follow-up-to-service-request-7000721384-pertaining-to-air-ingress-velocity/441438#441438&lt;/a&gt;) which mentions potential future enhancements to directly report free-air flowrate and velocities.&amp;nbsp; Has there been any updates to address this enhancement?&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;Thanks,&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;Brian&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>SewerGEMS Skeletonization</title><link>https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/182256/sewergems-skeletonization</link><pubDate>Tue, 09 Jul 2019 17:01:50 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:4504d795-7002-4252-a977-681cb3820a2d</guid><dc:creator>Brian White</dc:creator><description>&lt;p&gt;Does SewerGEMS have a tool to skeletonize the network similar to WaterGEMS?&amp;nbsp; We are only planning to model the main &amp;quot;backbone&amp;quot; system, because we do not have good invert data for the entire system, but we want to use parcel and land use information to assign loads.&amp;nbsp; If we have the connectivity for all the smaller gravity lines I assume it&amp;#39;s easiest to assign loads to the entire system using one of the Load Builder methods, but then we will need to transfer that load downstream to the backbone system since the smaller lines will not be in the model.&amp;nbsp; Is there a tool for this in SewerGEMS?&amp;nbsp;&amp;nbsp;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Ask A Question I</title><link>https://communities.bentley.com/achievements/460ac7df-7ccc-4c42-a204-9e05eef3be09</link><pubDate>Tue, 09 Jul 2019 00:48:41 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:f46b80ca-b277-41e3-a542-24c05b7def0b</guid><dc:creator /><description>Ask a question in a forum.</description></item></channel></rss>