Hydrology - All Forums - SWMM 5 or SWMM or EPASWMM and SWMM5 in ICM_SWMM2024-03-29T06:39:20Zhttps://swmm2000.com/forum/topics/feed/category/HydrologyLID Helphttps://swmm2000.com/forum/topics/lid-help2018-05-16T21:34:59.000Z2018-05-16T21:34:59.000ZJonathan Hohttps://swmm2000.com/members/JonathanHo<div><p>Greetings fellow SWMMers,</p><p>I am working on my masters project and I am struggling to get the output of my model to match with the precipitation data I have.</p><p>My precipitation data indicates that I should have about 50 inches of cumulative rainfall for the year 2008. However, the output of my model, using the assoicated precipitation values as input for my time series, indicates that there is only about 20 inches of precipitation. I have set the units as inches and cumulative precipitation, with my subcatchments imperviousness set to 100%, as well as specifying LID parameters (dedicated entire subcatchment area to area of LID; rain barrel height, outlet, etc.)</p><p>Does anyone have any suggestions as how to go about fixing this issue? </p><p>Some context: My project invovles rainwater harvesting using the LID capabilities within SWMM. I have precipitation data from NOAA for several rain gauges in Nan, Thailand - a rural, mountainous province. The precipitation data is 24 hour amounts, but I have calculated cumulative precip (which I am using as input since the 24 hour values yield about 7 inches of annual precip). I am looking into using the rooftops of the homes, which are primarily corrugated steel sheets, to capture the precipitation. </p><p>Regards,</p><p>Jon</p></div>LID Control Editorhttps://swmm2000.com/forum/topics/lid-control-editor2018-02-21T03:44:20.000Z2018-02-21T03:44:20.000ZBenjamin Fahyhttps://swmm2000.com/members/BenjaminFahy<div><p>Hi there, </p><p>Very new SWMM user here. Interested in defining some LID Controls so I can select them for my subcatchments in the drop down menu in the editor. </p><p> </p><p>It seems I need to first define the Controls and how they are routed using the specialized property editor "LID Control Editor". 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If I pick 6 inch rectangular gutter, it can take 0.21 cfs.<br/>Can I now size the downsprouts and their number, based on this 0.21 cfs gutters's flow rate ?</p><p>I apologies for not asking the question directly related to SWMM.<br/>Thank you in advance.</p></div>Sidewalk-porch drainage principleshttps://swmm2000.com/forum/topics/sidewalk-porch-drainage-principles2016-08-28T07:45:06.000Z2016-08-28T07:45:06.000ZBernard Dankohttps://swmm2000.com/members/BernardDanko<div><p>Hello,<br/>Please forgive me for my bad English.<br/><br/>I am wondering if somebody could help me with one particular issue that has been puzzling me for some time.<br/>I started reading the NDS <a rel="nofollow" href="http://www.ndspro.com/media/wysiwyg/files/principles-of-exterior-drainage.pdf" target="_blank">Principles of Exterior Drainage</a> publication. On <span lang="en" xml:lang="en"><a rel="nofollow" href="http://www.ndspro.com/media/wysiwyg/files/principles-of-exterior-drainage.pdf#page=57" target="_blank">page 55</a> of that publication</span> they solved the impervious surface drainage of the sidewalk in front of the house and the cement porch behind the house, by simply angling them towards the lawn:</p><p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3284346198?profile=original"><img width="300" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3284346198?profile=RESIZE_320x320" width="300"/></a><br/>Why is this so? Is this the correct approach in solving the impervious surface drainage of the sidewalk and the porch? Or should both of them have a catch basin in the middle of them?<br/>What confuses me is this principle of simply angling them (the sidewalk and the porch) towards the lawn. Is this a good approach or not?<br/><br/>I would be very grateful for any kind of reply.</p><p>I apologize if this question is at the moment not directly related with SWMM. I tried contacting the NDS but never got any kind of reply.<br/>Thank you in advance.</p><p>Regards,<br/>Bernard</p></div>Head of the class: Ravens' John Urschel gets straight A's in four Ph.D. courses at MIThttps://swmm2000.com/forum/topics/head-of-the-class-ravens-john-urschel-gets-straight-a-s-in-four-p2016-05-31T08:05:52.000Z2016-05-31T08:05:52.000Zxgwweihttps://swmm2000.com/members/xgwwei<div><p></p><p>Baltimore Ravens offensive lineman John Urschel isn't just taking classes at <a rel="nofollow" title="wholesale nfl jerseys" href="http://www.humanscaleseating.com/" target="_blank">wholesale nfl jerseys</a> the Massachusetts Institute of Technology. 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Some paints were even specifically made for wall paintings and not papyrus or wood.. <a rel="nofollow" title="cheap jerseys" href="http://www.learningwarereviews.com/" target="_blank">cheap jerseys</a></p></div>What are the inflow boundary conditions in SWMM model set-up?https://swmm2000.com/forum/topics/what-are-the-inflow-boundary-conditions-in-swmm-model-set-up2016-04-16T13:23:37.000Z2016-04-16T13:23:37.000ZDS Bishthttps://swmm2000.com/members/DSBisht<div><p>How the inflow boundary conditions in SWMM model should be set-up for runoff modeling <em><strong>(I am not asking about runoff quality).</strong></em></p><p>What I do is to run the model with input parameters and rainfall value, what else needed to be done. </p></div>Depression Storagehttps://swmm2000.com/forum/topics/depression-storage2015-10-08T19:21:25.000Z2015-10-08T19:21:25.000ZRobert Ryanhttps://swmm2000.com/members/RobertRyan<div><p>I am modeling a small (<1acre) pervious area and running continuous simulations of ~ 2yrs to check the impact of various depression storage values. Based on the SWMM manual and other sources I assumed the total runoff and outflow would be reduced proportionally when I increased depression storage from 0.1 inch to 0.2 inch. Instead I found the total runoff increased ~20%. Has anyone else seen this happen?</p><p>Rob</p></div>Using Curve Number in SWMM 5.0https://swmm2000.com/forum/topics/using-curve-number-in-swmm-5-02014-10-27T16:26:47.000Z2014-10-27T16:26:47.000ZBarbara DuBosehttps://swmm2000.com/members/BarbaraDuBose<div><p>Hello,</p><p>I am new to the site and hoping to get a few questions answered about the newest version of SWMM. I am currently a student working on a design project and we have choosen SWMM to model stormwater mangement in a cluster resdential development. I started using HEC HMS and then switched to SWMM a little later and I used the curve number method to generate my runoff depth for pre development and post development conditions. For some reason the pre development conditions are extremely off, HEC HMS gave me about 0.62 inches of runoff and SWMM gave me about 1.5 inches of runoff (there is no impervious area pre development). The post development was much closer (only about 0.2 inches off). </p><p>I've checked the curve numbers to make sure they are right and other parameters (area, width, rainfall, etc.) are the same.</p><p> </p><p>Has anyone experienced this problem before? Any insight or suggestions would be greatly appreciated!</p><p>Thanks!</p></div>How to Calibrate EPA-SWMM Model with PEST?https://swmm2000.com/forum/topics/how-to-calibrate-epa-swmm-model-with-pest2014-10-21T06:04:36.000Z2014-10-21T06:04:36.000ZAdil Hassanhttps://swmm2000.com/members/AdilHassan<div><p>Can anyone help me providing a sample SWMM model calibration tutorial set that uses PEST. I have a storm network model and I need to calibrate the model using PEST. </p><p>Any relevant suggestion, tutorial or reference is appreciated in advance.</p></div>SWMM rain-garden - accounting for exfiltrationhttps://swmm2000.com/forum/topics/swmm-rain-garden-accounting-for-exfiltration2014-09-24T02:33:51.000Z2014-09-24T02:33:51.000ZMatt Burnshttps://swmm2000.com/members/MattBurns<div><p>Hi there users,</p><p></p><p>Having some trouble modelling rain-gardens in SWMM. I have a few rain-gardens draining impervious surfaces in an urban catchment. </p><p>In checking the detailed rain-garden flux files, it would appear that there is no exfiltration and the soil moisture never falls below porosity. </p><p>I am thinking that perhaps I need to add an Aquifer so that water from the rain-garden recharge the aquifer?</p><p>But I do not have any details on the local aquifer. Is it somehow possible in SWMM to specify a realistic exfiltration rate of the soils surrounding the rain-garden? </p><p></p><p>Thanks,</p><p>Matt.</p><p></p><p></p></div>How to model a side entry pit in SWMM?https://swmm2000.com/forum/topics/how-to-model-a-side-entry-pit-in-swmm2014-03-31T22:50:21.000Z2014-03-31T22:50:21.000ZMatt Burnshttps://swmm2000.com/members/MattBurns<div><p>Hi there users,</p><p>I'm currently using SWMM V5 to model the drainage network for a small urban catchment.</p><p>There are a few side entry pits along the road—these pits capture road runoff. </p><p>I was wondering, is there a way in SWMM to specify the inlet capacity of such pits? </p><p>In reality, such pits do not have "unlimited" inlet capacity and I would be keen to capture this in my model.</p><p>Thanks,</p><p>Matt.</p><p></p><p></p><p></p><p></p><p></p></div>Climate-proofing citieshttps://swmm2000.com/forum/topics/climate-proofing-cities2013-01-10T11:23:32.000Z2013-01-10T11:23:32.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div dir="ltr" style="text-align: left;">
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<div style="background-color: white; border: 0px; color: #2a2a2a; font-family: Georgia,Times New Roman,Times,serif; font-size: 15px; line-height: 22.78333282470703px; margin: 0px 0px 1.4em; padding: 0px; vertical-align: baseline;"><br />
Here's just one example, from Singapore:</div>
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<a href="http://grist.files.wordpress.com/2013/01/singapore.jpg?w=250&h=166" target="_blank"><img src="http://grist.files.wordpress.com/2013/01/singapore.jpg?w=250&h=166&width=555" width="555" class="align-full" /></a><a href="http://www.flickr.com/photos/randytan/8049086732/" style="border: 0px; color: #777777; font-family: inherit; font-size: 9px; font-style: inherit; margin: 0px; padding: 0px; text-decoration: initial; vertical-align: baseline;" title="image credit">RnD.de.Portraits</a>Singapore's Marina Barrage.<br />
<blockquote style="background-color: white; border-left-color: #cccccc; border-left-style: solid; border-width: 0px 0px 0px 1px; color: #2a2a2a; font-family: Georgia,Times New Roman,Times,serif; font-size: 15px; line-height: 22.78333282470703px; margin: 0px 0px 1.4em 42px; padding: 0px 0px 0px 10px; vertical-align: baseline;">
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The Marina Barrage and Reservoir, which opened in 2008, is at the heart of Singapore's two-billion-dollar campaign to improve drainage infrastructure, reduce the size of flood-prone areas, and enhance the quality of city life. It has nine operable crest gates, a series of enormous pumps, and a ten-thousand-hectare catchment area that is roughly one-seventh the size of the country. The system not only protects low-lying urban neighborhoods from flooding during heavy rains; it also eliminates the tidal influence of the surrounding seawater, creating a rainfed supply of freshwater that currently meets ten percent of Singapore's demand. More over, by stabilizing water levels in the Marina basin the barriers have produced better conditions for water sports. The Marina's public areas, which include a sculpture garden, a water-play space, a green roof with dramatic skyline vistas, and the Sustainable Singapore Gallery, bolster the city's tourist economy as well.</div>
</blockquote>
<div style="background-color: white; border: 0px; color: #2a2a2a; font-family: Georgia,Times New Roman,Times,serif; font-size: 15px; line-height: 22.78333282470703px; margin: 0px 0px 1.4em; padding: 0px; vertical-align: baseline;"><span style="line-height: 22.78333282470703px;">That's a brilliant way to address two climate impacts -- large precipitation events and rising sea levels -- at once. Singapore has also elevated all access points to its underground subway a least a meter above high-water flood levels. It's also building desalination plants and systems to reuse waste water. It's also burying its power lines.</span></div>
<div style="background-color: white; border: 0px; color: #2a2a2a; font-family: Georgia,Times New Roman,Times,serif; font-size: 15px; line-height: 22.78333282470703px; margin: 0px 0px 1.4em; padding: 0px; vertical-align: baseline;"><span style="line-height: 22.78333282470703px;">Engineers at the Dutch firm Arcadis recently proposed a large new sea barrier for north of New York City's Verrazano-Narrows Bridge. The price tag: $6.5 billion. And that's just one small piece of the puzzle. All this stuff is prudent, but it's </span><em style="border: 0px; font-family: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">expensive</em><span style="line-height: 22.78333282470703px;">.</span></div>
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Via <a href="http://grist.org/climate-energy/climate-proofing-cities-not-something-conservatives-are-going-to-be-good-at/">http://grist.org/climate-energy/climate-proofing-cities-not-something-conservatives-are-going-to-be-good-at/</a></div>
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</div>Singapore - Catching Every Drop of Rainhttps://swmm2000.com/forum/topics/singapore-catching-every-drop-of-rain2012-12-29T03:51:23.000Z2012-12-29T03:51:23.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div dir="ltr" style="text-align: left;">
<div class="posterous_autopost"><span style="font-family: Georgia, serif;">Singapore -</span> <b style="font-family: Georgia, serif;">Catching Every Drop of Rain</b><br />
<div class="gmail_quote"><br />
<span style="font-family: Georgia,serif;">The source of the map of the rivers of Singapore is the Singapore <a href="http://www.pub.gov.sg/water/Pages/LocalCatchment.aspx" target="_blank">PUB</a></span><br />
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<span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">As a small island that doesn't have natural aquifers and lakes and with little land to collect rainwater, Singapore needs to maximize whatever it can harvest.</span></div>
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<span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Currently, Singapore uses two separate systems to collect rainwater and used water. Rainwater is collected through a comprehensive network of drains, canals, rivers and stormwater collection ponds before it is channelled to Singapore's 17 reservoirs for storage. This makes Singapore one of the few countries in the world to harvest urban stormwater on a large scale for its water supply.</span></div>
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<span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">The newest reservoirs are Punggol and Serangoon Reservoirs which are our 16th and 17th reservoirs. By 2011, the water catchment area has increased from half to two-thirds of Singapore’s land surface with the completion of the Marina, Punggol and Serangoon reservoirs.</span></div>
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<span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">With all the major estuaries already dammed to create reservoirs, PUB aims to harness water from the remaining streams and rivulets near the shoreline using technology that can treat water of varying salinity. This will boost Singapore’s water catchment area to 90% by 2060,</span></div>
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<span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">The goal is to capture every drop of rain (Figure 1)</span></div>
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<span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;"><img alt="Image004" height="334" src="http://getfile8.posterous.com/getfile/files.posterous.com/swmm5/grx8BAZQVKbdeQzcixBAU5VQgv8RaAkEkTXTA8D9D7blkhrncFpsPKCxBSPi/image004.jpg" width="632" /></span></div>
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<span style="color: #333333; font-family: Georgia,serif; font-size: 16.0pt;">Reservoirs</span></div>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Pandan Reservoir</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Kranji Reservoir</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Jurong Lake Reservoir</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">MacRitchie Reservoir</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Upper Peirce Reservoir</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Lower Peirce Reservoir</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Bedok Reservoir</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Upper Seletar Reservoir</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Lower Seletar Reservoir</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Poyan Reservoir</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Murai Reservoir</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Tengeh Reservoir</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sarimbun Reservoir</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Pulau Tekong Reservoir</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Marina Reservoir</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Serangoon Reservoir</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Punggol Reservoir</span></td>
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<span style="color: #333333; font-family: Georgia,serif; font-size: 16.0pt;">Rivers</span></div>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Singapore River</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Kallang</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Rochor River</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Whampoa</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Geylang River</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Bedok</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Ketapang</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Changi</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Selarang</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Loyang</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Tampines</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Api Api</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Blukar</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Serangoon</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Punggol</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Tongkang</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Pinang</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Seletar</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Khatib Bongsu</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Seletar Simpang Kiri</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Sembawang</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Mandai</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei China</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Mandai Kechil</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Peng Siang</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Tengah</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Kangkar</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Buloh Besar</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Jurong</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Lanchar</span></td>
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<td style="padding: .75pt .75pt .75pt .75pt;" width="150"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Pandan</span></td>
<td style="padding: .75pt .75pt .75pt .75pt;"><span style="color: #333333; font-family: Georgia,serif; font-size: 9.0pt;">Sungei Ulu Pandan</span></td>
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<td style="text-align: center;"><a href="http://getfile4.posterous.com/getfile/files.posterous.com/swmm5/s75GGMlANC8ZFxzigR9MK9wQbFxULkFY6vGzA6xEiVrOVGoqXSX4SJ0BkyTt/image003.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Image003" height="461.97" src="http://getfile4.posterous.com/getfile/files.posterous.com/swmm5/s75GGMlANC8ZFxzigR9MK9wQbFxULkFY6vGzA6xEiVrOVGoqXSX4SJ0BkyTt/image003.jpg" width="696" /></a></td>
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<td class="tr-caption" style="text-align: center;"><span style="font-family: Georgia, serif; font-size: small; text-align: left;">Figure 1. Overall Map of Singapore from </span><a href="http://caelanchewthegreat.blogspot.sg/2012/04/geography-aa-2012national-tap-1-water.html" style="font-family: Georgia, serif; font-size: medium; text-align: left;" target="_blank">http://caelanchewthegreat.blogspot.sg/2012/04/geography-aa-2012national-tap-1-water.html</a></td>
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</div>Example SWMM 5 Snowmelt Modelhttps://swmm2000.com/forum/topics/example-swmm-5-snowmelt-model2012-11-10T01:51:30.000Z2012-11-10T01:51:30.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div class="gmail_quote">
<p>Subject: Example SWMM 5 Snowmelt Model</p>
<p> </p>
<p>Attached is a simple sample snowmelt model in SWMM 5 that has built in snowfall and temperature in a one subcatcment model with snowmelt.   You define the separation of precipitation into snowfall and rainfall by setting a base temperature in the Snow Pack Editor.   The precipitation that falls with when the air temperature is below the base temperature is stored in a snow pack where it eventually will melt when the temperature rises or is moved via plowing.  You can have an initial snow cover, final snow cover and runoff from the melting snow long after the snowfall occurs.</p>
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<p><a href="http://getfile0.posterous.com/getfile/files.posterous.com/swmm5/2vOXc5pOX4AcZxdQGzhatZD6lOP3iPZmmi1K4VyMOSkerxVUeZpc3G4vzg6S/image002.jpg.scaled.1000.jpg"><img alt="Image002" height="550" src="http://getfile0.posterous.com/getfile/files.posterous.com/swmm5/2vOXc5pOX4AcZxdQGzhatZD6lOP3iPZmmi1K4VyMOSkerxVUeZpc3G4vzg6S/image002.jpg.scaled.1000.jpg" width="1000" /></a><a href="http://getfile7.posterous.com/getfile/files.posterous.com/swmm5/EGvmIAU08O41K9M4QFBvgfaLdHsSIhSBixfbzdgwOe7kJi6MMpKesD05KKwO/image001.png.scaled.1000.jpg"><img alt="Image001" height="539" src="http://getfile7.posterous.com/getfile/files.posterous.com/swmm5/EGvmIAU08O41K9M4QFBvgfaLdHsSIhSBixfbzdgwOe7kJi6MMpKesD05KKwO/image001.png.scaled.1000.jpg" width="1000" /></a></p>
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<p><strong>small_snowmet_example.inp</strong> <a href="http://getfile1.posterous.com/getfile/files.posterous.com/swmm5/zZDaIYZza4shMylHSQgqsd6lqydXT5a6jhOMlQ8BqixC41U5oLHjY5JCpinC/small_snowmet_example.inp">Download this file</a></p>
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</div>Example Groundwater Model in SWMM 5https://swmm2000.com/forum/topics/example-groundwater-model-in-swmm-52012-11-10T01:44:20.000Z2012-11-10T01:44:20.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div class="gmail_quote">
<p><b>Subject:</b>   Example Groundwater Model in SWMM 5</p>
<p> </p>
<p>The attached model shows three ways in which the groundwater model of the SWMM 5 subcatchments interact with the node depths of the hydraulic network.  The hydraulic network interaction can be either: </p>
<p><font>1.<font face="'Times New Roman'">       </font></font>At a fixed water surface elevation,</p>
<p><font>2.<font face="'Times New Roman'">       </font></font>At a time varying water surface elevation based on the inflow and geometry of the node and</p>
<p><font>3.<font face="'Times New Roman'">       </font></font>At a threshold node water surface elevation. </p>
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<p><a href="http://getfile4.posterous.com/getfile/files.posterous.com/swmm5/Uzfp5V1PJxg5PMLFIBiAfI51vvrxCDQOeBTTglZ8pWJf5PBCtj0hDODO6ohJ/image002.png.scaled.1000.jpg"><img alt="Image002" height="554" src="http://getfile4.posterous.com/getfile/files.posterous.com/swmm5/Uzfp5V1PJxg5PMLFIBiAfI51vvrxCDQOeBTTglZ8pWJf5PBCtj0hDODO6ohJ/image002.png.scaled.1000.jpg" width="1000" /></a><a href="http://getfile0.posterous.com/getfile/files.posterous.com/swmm5/rLdJe8TbvWlSYLBbRkY0D3AI28rhWcXQNb0uP8z0K4pKak0caU25Q4aDQvQR/image001.png.scaled.1000.jpg"><img alt="Image001" height="684" src="http://getfile0.posterous.com/getfile/files.posterous.com/swmm5/rLdJe8TbvWlSYLBbRkY0D3AI28rhWcXQNb0uP8z0K4pKak0caU25Q4aDQvQR/image001.png.scaled.1000.jpg" width="1000" /></a></p>
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<p><strong>GW_INTERACTION.inp</strong> <a href="http://getfile4.posterous.com/getfile/files.posterous.com/swmm5/AVRcSH2UwgjL0sb1uHDZLBvQU08qXedNrpE9VOnWLUfcgmtoRXN6HDE5Iqpl/GW_INTERACTION.inp">Download this file</a></p>
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</div>Example DUPUIT-FORCHHEIMER APPROXIMATION FOR SUBSURFACE FLOW Model in SWMM 5https://swmm2000.com/forum/topics/example-dupuit-forchheimer-approximation-for-subsurface-flow-mode2012-11-10T01:42:51.000Z2012-11-10T01:42:51.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div class="gmail_quote">
<p><b>Subject: </b>  Example  DUPUIT-FORCHHEIMER APPROXIMATION FOR SUBSURFACE FLOW Model in SWMM 5</p>
<p> </p>
<p>This example was created from an older SWMM 4 model from 1988 using the SWMM 4 to SWMM 5 converter.  The values for the coefficients in this case are A1 = A3 = 4*K/L^2, A2 = 0, B1 or the exponent or B1=2 or from Appendix X in the SWMM 4 manual from OSU (<a href="http://eng.odu.edu/cee/resources/model/mbin/swmm/swmm_6.pdf" target="_blank">http://eng.odu.edu/cee/resources/model/mbin/swmm/swmm_6.pdf</a>)</p>
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<p><a href="http://getfile1.posterous.com/getfile/files.posterous.com/swmm5/hELfS2Zw9NkSF8OePwUvKOjCWt66tBZFLbcPITVrCWqvg7V9ysEmnM450H70/image001.png"><img alt="Image001" height="314.004914004914" src="http://getfile1.posterous.com/getfile/files.posterous.com/swmm5/hELfS2Zw9NkSF8OePwUvKOjCWt66tBZFLbcPITVrCWqvg7V9ysEmnM450H70/image001.png" width="600" /></a><a href="http://getfile7.posterous.com/getfile/files.posterous.com/swmm5/zVsnI6n9ScSui4bKYPu74uCX9IhrI0foelAGQRDM0If7mQPYhWDWpShTPycs/image003.png"><img alt="Image003" height="144.0" src="http://getfile7.posterous.com/getfile/files.posterous.com/swmm5/zVsnI6n9ScSui4bKYPu74uCX9IhrI0foelAGQRDM0If7mQPYhWDWpShTPycs/image003.png" width="600" /></a></p>
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<p><strong>DUPUIT-FORCHHEIMER_APPROXIMATI.inp</strong> <a href="http://getfile3.posterous.com/getfile/files.posterous.com/swmm5/cU6tqEpg4L9ZOTcbRXn4PxZ8kN1mPYEOTwHFyWOUr5DHBPF61hiQyhuNSTjH/DUPUIT-FORCHHEIMER_APPROXIMATI.inp">Download this file</a></p>
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</div>SWMM 5 Precipitation Optionshttps://swmm2000.com/forum/topics/swmm-5-precipitation-options2012-11-10T01:35:03.000Z2012-11-10T01:35:03.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div dir="ltr" style="text-align: left;">
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<span style="background-color: white; font-family: georgia, serif;"><b>Subject:</b>  <span class="il">SWMM</span> <span class="il">5</span> <span class="il">Precipitation</span> <span class="il">Options</span></span></div>
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<span style="background-color: white; font-family: georgia, serif;">You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative <span class="il">precipitation</span>, use both <span class="il">rainfall</span> and snowfall in the same rain gage depending on temperature, use both time series or external files for the rain gage and have unlimited rain gages with the limitation of one rain gage per subcatchment .</span><span style="font-family: georgia, serif;"> </span></div>
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</div>SWMM 5 Subcatchment Runoff and Depth Relationshiphttps://swmm2000.com/forum/topics/swmm-5-subcatchment-runoff-and-depth-relationship2012-10-29T13:58:18.000Z2012-10-29T13:58:18.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div dir="ltr" style="text-align: left;">
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<b>Note:</b> The surface runoff is a non linear function of the independent depth in both the pervious and impervious areas of the subcatchments. No surface runoff occurs until the depth over either the impervious or pervious area is greater than the respective depression storage (Figure’s 1, 2, 3 and 4).<br />
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<td class="tr-caption" style="text-align: center;"><i style="font-size: medium; text-align: left;">Figure 1:</i><span style="font-size: small; text-align: left;"> Surface Runoff, Depth and Depression Storage Relationship.</span></td>
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<i>Figure 1:</i> Surface Runoff, Depth and Depression Storage Relationship.<br />
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<td style="text-align: center;"><a href="http://posterous.com/getfile/files.posterous.com/swmm5/Uep2a7KIoTEjIOXZTW2yIaRQ8YRcGb3Qnage0AuvVL0AvuGWaS7rWG9a9HLW/image002.png.scaled.1000.jpg" style="margin-left: auto; margin-right: auto;"><img src="http://posterous.com/getfile/files.posterous.com/swmm5/yJWNW2zkgWX5rLc0E7tI8CGBxjKsqfPsvxECDMRN5ZXbj7ydN27Tlmse5C90/image002.png.scaled.500.jpg" /></a></td>
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<td class="tr-caption" style="text-align: center;"><i style="font-size: medium; text-align: left;">Figure 2:</i><span style="font-size: small; text-align: left;"> Subcatchment Runoff and Depth over time with a Subcatchment Width of 500 feet.</span></td>
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<td class="tr-caption" style="text-align: center;"><i style="font-size: medium; text-align: left;">Figure 3:</i><span style="font-size: small; text-align: left;"> Subcatchment Runoff and Depth in a Scatter Graph with a Subcatchment Width of 500 feet.</span></td>
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<td class="tr-caption" style="text-align: center;"><i style="font-size: medium; text-align: left;">Figure 4:</i><span style="font-size: small; text-align: left;"> Subcatchment Runoff and Depth in a Scatter Graph with a Subcatchment Width of 2000 feet.</span></td>
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</div>How Does Horton Infiltration Work in SWMM 5?https://swmm2000.com/forum/topics/how-does-horton-infiltration-work-in-swmm-52012-08-23T05:31:06.000Z2012-08-23T05:31:06.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div dir="ltr" style="text-align: left;">
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<span style="font-family: Georgia,serif;">This sketch summarizes what happens in a SWMM 5 Subcatchment for Horton Infiltration during a storm event:</span><br />
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<span style="font-family: Georgia,serif;">1.<span style="font: 7.0pt Times New Roman;">      </span></span> <span style="font-family: Georgia,serif;">The event starts out with the potential infiltration rate at the maximum infiltration rate but</span><br />
<span style="font-family: Georgia,serif;">2.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">Decay starts happening right away and the potential infiltration rate starts decreasing until it reaches the minimum infiltration rate (assuming the storm last long enough),</span><br />
<span style="font-family: Georgia,serif;">3.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">The actual infiltration rate is the minimum of the rainfall rate or the potential infiltration rate,</span><br />
<span style="font-family: Georgia,serif;">4.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">Using the Huff distributions for rainfall the runoff does not start happening until the rainfall rate exceeds the potential infiltration rate in these models</span><br />
<span style="font-family: Georgia,serif;">5.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">The runoff ceases after the rainfall rate becomes less than the current potential infiltration rate later in the storm,</span><br />
<span style="font-family: Georgia,serif;">6.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">The maximum infiltration volume for Horton caps the storm event infiltration at 10 mm in this example, the infiltration will cease when the cumulative infiltration reaches 10 mm.</span><br />
<span style="font-family: Georgia,serif;">7.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">Horton Iniltration is a five parameter method</span><br />
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<span style="font-family: Georgia,serif;">a.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">Maximum infiltration rate in mm/hour</span></div>
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<span style="font-family: Georgia,serif;">b.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">Minimum infiltration rate in mm/hour</span></div>
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<span style="font-family: Georgia,serif;">c.<span style="font: 7.0pt Times New Roman;">      </span></span> <span style="font-family: Georgia,serif;">Decay rate for the change from maximum to minimum infiltration rate</span></div>
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<span style="font-family: Georgia,serif;">d.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">Regeneration rate for the change from minimum to maximum infiltration rate after the storm event ends and</span></div>
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<span style="font-family: Georgia,serif;">e.<span style="font: 7.0pt Times New Roman;">     </span></span> <span style="font-family: Georgia,serif;">A maximum infiltration volume per storm event in millimeters</span></div>
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<td class="tr-caption" style="text-align: center;">Figure 1.  Sketch of Horton Infiltration in a SWMM 5 Subcatchment.</td>
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<a href="http://swmm5.posterous.com/how-does-horton-infiltration-work-in-swmm-5"><img alt="" src="http://posterous.com/images/filetypes/unknown.png" /></a><br />
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<strong>Horton import_10MM_MaxInfil.inp</strong> <a href="http://getfile1.posterous.com/getfile/files.posterous.com/swmm5/cBQMLJ9D3lbBIzd7ZKNN1xuUKwLIQQPJdcyJWQB5HLQmYU7zj3SkjNDOaNS1/Horton_import_10MM_MaxInfil.inp">Download this file</a></div>
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</div>Fifty Years of Watershed Modeling – Past, Present and Futurehttps://swmm2000.com/forum/topics/fifty-years-of-watershed-modeling-past-present-and-future2012-08-17T03:54:09.000Z2012-08-17T03:54:09.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div class="planeth">Fifty Years of Watershed Modeling – Past, Present and Future</div>
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<p><strong>Fifty Years of Watershed Modeling –</strong></p>
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<p><strong>Past, Present and Future</strong></p>
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<p><b><font color="#0000CC">September 24-26, 2012<br />
Boulder, Colorado</font></b></p>
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<p><font face="georgia,serif">On behalf of Engineering Conferences International and the conference chairs, </font><b>Anthony S. Donigian, Jr.</b><font face="georgia,serif"> (AQUA TERRA Consultants), and</font><b>Richard Field</b><font face="georgia,serif"> (US Environmental Protection Agency/ORD [retired], Michael J. Baker Jr., Inc.), it is my pleasure to extend this invitation to you to participate in </font><b>Fifty Years of Watershed Modeling – Past, Present and Future</b><font face="georgia,serif"> to be held September 24-26, 2012 at NCAR (National Center for Atmospheric Research – Center Green Campus) in Boulder, Colorado.</font></p>
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<p><b>Continuous Simulation using SWMM 5 LID and Groundwater Features in a Linked 1D/2D Network using InfoSWMM 2D for a 50 Year Period</b></p>
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<p>has been accepted for <b>Poster Presentation</b> at the forthcoming conference <b>Fifty Years of Watershed Modeling: Past, Present and Future</b> to be held September 24-26, 2012 at <font>National Center for Atmospheric Research (NCAR – Center Green Campus) in Boulder, Colorado.</font></p>
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<div class="planeth">Continuous Simulation using SWMM 5 LID and Groundwater Features in a Linked 1D/2D Network using InfoSWMM 2D for a 50 Year Period</div>
</div>How is the Soil Saturated Conductivity Used in SWMM 5 Green-Ampt?https://swmm2000.com/forum/topics/how-is-the-soil-saturated-conductivity-used-in-swmm-5-green-ampt2012-07-10T20:24:00.000Z2012-07-10T20:24:00.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><p><b><font face="Verdana, sans-serif">Subject:</font></b><font face="Verdana, sans-serif">   How is the Soil Saturated Conductivity Used in SWMM 5 Green-Ampt?</font></p>
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<p><font face="Verdana, sans-serif">How sensitive is the infiltration loss and rate to the Soil Saturated Conductivity parameter in the SWMM 5 Green-Ampt  infiltration method (Figure 1).   Figure 2 shows how the total infiltration loss and total loss rate vary as you change the soil saturated conductivity from 1 to 0.1 to 0.01 inches/hour.  Internally, Ks is used to check saturation and in the computation of the soil infiltration rate. Two of the checks are:</font></p>
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<p><font face="Symbol"><font>·<font face="'Times New Roman'">         </font></font></font><font face="Verdana, sans-serif">In low rainfall everything infiltrates as irate less than Infil < Infil/</font><font face="Verdana, sans-serif">Ks and</font></p>
<p><font face="Symbol"><font>·<font face="'Times New Roman'">         </font></font></font><font face="Verdana, sans-serif">In the check to see if the soil is already saturated.</font><font face="Verdana, sans-serif"> </font><span style="font-family: Verdana, sans-serif;"> </span></p>
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<td class="tr-caption"><b><font face="Verdana, sans-serif">Figure 1.</font></b><font face="Verdana, sans-serif">  The three parameters for Green-Ampt Infiltration in SWMM 5</font> </td>
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<td class="tr-caption"><b><font face="Verdana, sans-serif">Figure 2.</font></b><font face="Verdana, sans-serif">  The sensitivity of the total infiltration loss to the soil saturated conductivity in a continuous simulation</font></td>
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</div>How is Capillary Suction Head Used in SWMM 5 Green-Ampt?https://swmm2000.com/forum/topics/how-is-capillary-suction-head-used-in-swmm-5-green-ampt2012-07-10T17:41:46.000Z2012-07-10T17:41:46.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><p><b>Subject:</b>   How is Capillary Suction Head Used in SWMM 5 Green-Ampt?</p>
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<p>How sensitive is the infiltration loss and rate to the capillary suction head parameter in the SWMM 5 Green-Ampt  infiltration method.   Figure 1 shows how the total infiltration loss and total loss rate vary as you change the suction head from 12 to 6 to 3 inches.    Internally the suction head is used in infil.c of SWMM 5 by adding the suction head to the ponded water on the pervious area in the parameter c1 of the implicit Green-Ampt SWMM5 solution.</p>
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<p>C1 =  (Suction Head + Depth of Ponded Water) * IMD or Initial Moisture Deficit<span> </span></p>
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<td class="tr-caption"><b>Figure 1.</b><span>  The sensitivity of the total infiltration loss to the capillary suction head in a continuous simulation</span> </td>
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</div>How Does Green Ampt Cumulative Event Infiltration work in SWMM 5?https://swmm2000.com/forum/topics/how-does-green-ampt-cumulative-event-infiltration-work-in-swmm-52012-07-06T20:02:17.000Z2012-07-06T20:02:17.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><p><font face="Verdana, sans-serif">Subject:   How Does Green Ampt Cumulative Event Infiltration work in SWMM 5?</font></p>
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<p><font face="Verdana, sans-serif">This graph shows the values of the internal SWMM 5 parameters for Green Ampt Infiltration for the pervious area of a Subcatchment during a simulation.  The parameters are:</font></p>
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<p><font color="#9BBB59" face="Symbol"><font>·<font face="'Times New Roman'">         </font></font></font><b><font color="#9BBB59" face="Verdana, sans-serif">F or FTOT which is the cumulative event infiltration at the start of a time interval in the internal units of feet in SWMM 5,</font></b></p>
<p><font color="#9BBB59" face="Symbol"><font>·<font face="'Times New Roman'">         </font></font></font><b><font color="#9BBB59" face="Verdana, sans-serif">FU or current moisture content of the upper zone of the of the soil</font></b></p>
<p><font face="Symbol"><font>·<font face="'Times New Roman'">         </font></font></font><b><font color="#9BBB59" face="Verdana, sans-serif">FUMAX which is the saturated moisture content of the upper zone in feet and stays constant during the simulation</font></b></p>
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<td class="tr-caption"><b><font face="Verdana, sans-serif">Figure 1.</font></b><font face="Verdana, sans-serif">  How FTOT, FU and F change over time</font></td>
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<td class="tr-caption"><b><font face="Verdana, sans-serif">Figure 2.</font></b><font face="Verdana, sans-serif">  A closer look at how FTOT or F and FU Change over time in a Green Ampt Pervious Area Simulation.</font></td>
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</div>How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt?https://swmm2000.com/forum/topics/how-does-the-infiltration-maximum-time-to-drain-the-upper-soil-zo2012-06-30T23:08:19.000Z2012-06-30T23:08:19.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><p><b>Subject:</b>  How does the <b>Infiltration Maximum Time to Drain the Upper Soil Zone</b> Work in SWMM 5 Green Ampt? </p>
<p>You can use the monthly soil recovery factor (Figure 1) in SWMM 5 to change how the Infiltration Maximum Time to Drain the Upper Soil Zone (Figure 2) is computed each month during a continuous simulation.  </p>
<p>The  depth of the upper soil zone in the internal  SWMM 5 units of feet is calculated at the start of the simulation based on the Green Ampt Soil Saturated Hydraulic Conductivity</p>
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<p><b>Upper Soil Zone Depth</b> = 4  * (Soil Saturated Hydraulic Conductivity * 12 * 3600)^0.5 / 12</p>
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<p>And the <b>Upper Zone Moisture Depletion Factor</b>  and <b>Infiltration Maximum Time to Drain the Upper Soil Zone </b>is calculated at each hydrology time step in SWMM 5.</p>
<p> </p>
<p><b>Upper Zone Moisture Depletion Factor</b>  = Upper Soil Zone Depth / 300 * 12 /3600 * <b>Monthly Evaporation Recovery Factor</b></p>
<p> </p>
<p><b>Infiltration Maximum Time to Drain the Upper Soil Zone</b> = 6 / (100 * Upper Zone Moisture Depletion Factor  )</p>
<p> </p>
<p><b>Figure 1.</b>  Monthly Soil Recovery Factor </p>
<div class="p_embed p_image_embed">
<p><a href="http://getfile3.posterous.com/getfile/files.posterous.com/swmm5/gHgalQtfqEsB49hKEa3IxMHtg8G7vnvpMUownEQLsY8I3jxyQKsrdxOzQZ1R/image001.png"><img alt="Image001" height="263.225806451613" src="http://getfile3.posterous.com/getfile/files.posterous.com/swmm5/gHgalQtfqEsB49hKEa3IxMHtg8G7vnvpMUownEQLsY8I3jxyQKsrdxOzQZ1R/image001.png" width="600" /></a></p>
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<p> </p>
<p><b>Figure 2</b>.  Infiltration Maximum Time to Drain the Upper Soil Zone for a Subcatchment</p>
<p> </p>
<div class="p_embed p_image_embed">
<p><a href="http://getfile9.posterous.com/getfile/files.posterous.com/swmm5/FULJLObclRpX6JeP9Vcw7Hv3Vqoko29PRtdmKNibXjdlqr60TRNDDRnLAJk2/image004.jpg.scaled.1000.jpg"><img alt="Image004" height="568" src="http://getfile9.posterous.com/getfile/files.posterous.com/swmm5/FULJLObclRpX6JeP9Vcw7Hv3Vqoko29PRtdmKNibXjdlqr60TRNDDRnLAJk2/image004.jpg.scaled.1000.jpg" width="1000" /></a></p>
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</div>Aquifer in SWMM 5https://swmm2000.com/forum/topics/aquifer-in-swmm-52012-01-24T09:57:58.000Z2012-01-24T09:57:58.000ZZhao Chenhttps://swmm2000.com/members/ZhaoChen<div><p><span>I am trying to use SWMM 5 to calculate the ground water flow in my model. </span>In the aquifer portion, it's required to input conductivity slope and tension slope. Robert, would you please advice me on how I can get these two data? thanks a lot!!</p></div>Water Related InfoGraphicshttps://swmm2000.com/forum/topics/water-related-infographics2011-12-24T22:25:38.000Z2011-12-24T22:25:38.000ZRobert Dickinsonhttps://swmm2000.com/members/doonePlace<div><div class="visually_embed"></div>
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