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--- infiltration_modeling [2022/05/24 14:42] – admin
+++ infiltration_modeling [2025/09/30 14:48] (current) – admin
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 ====== Infiltration Modeling ======
+:!: The current version of WinSLAMM (10.5.0) overestimates evapotranspiration (ET) volume. Until a fix is implemented, ET may not be turned on in the model. :!:
 =====Regulatory Approach to Infiltration=====
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-[{{ :wiki:images:target_stay_on.jpg |Figure 1: Target stay-on requirements}}]
+{{:wiki:images:target_stay_on.jpg?800}}
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 =====Approved Models for Calculating Infiltration and Recharge=====
+====WinSLAMM====
+WinSLAMM (Source Loading and Management Model for Windows) was developed to evaluate nonpoint source pollutant loading in urban areas using small storm hydrology. The model and parameter files are made available through the DNR [[https://dnr.wi.gov/topic/stormwater/standards/slamm.html|website]].
+The model uses series of normal rainfall events to calculate the pollutant loading and runoff volumes generated. The user is able to route runoff through a  approved control devices, such as [[infiltration basin|infiltration basins]], [[bioretention device|bioretention devices]],  [[wet pond|wet ponds]], [[permeable pavement]], or catchbasins to determine how effectively these devices remove pollutants and infiltrate stormwater.
+WinSLAMM is an approved model for calculating infiltration and sediment control.
 ====RECARGA====
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 P<sub>p</sub> = Percent pervious\\
 R<sub>Native</sub> = Site recharge rate, in/yr (from LWRD viewer)
-====WinSLAMM====
-WinSLAMM (Source Loading and Management Model for Windows) was developed to evaluate nonpoint source pollutant loading in urban areas using small storm hydrology. The model and parameter files are made available through the DNR [[https://dnr.wi.gov/topic/stormwater/standards/slamm.html|website]].
-The model uses series of normal rainfall events to calculate the pollutant loading and runoff volumes generated. The user is able to route runoff through a  approved control devices, such as [[infiltration basin|infiltration basins]], [[bioretention device|bioretention devices]],  [[wet pond|wet ponds]], [[permeable pavement]], or catchbasins to determine how effectively these devices remove pollutants and infiltrate stormwater.
-WinSLAMM is an approved model for calculating infiltration and sediment control.
 =====Modeling Assumptions and Guidance=====
-*As with the use of any modeling software, it is important to understand the underlying principals and assumptions used to generate the model’s results.  Designers utilizing RECARGA or WinSLAMM modeling software are expected to read and understand the user manual prior to submitting plans that include modeling results.
+As with the use of any modeling software, it is important to understand the underlying principals and assumptions used to generate the model’s results.  Designers utilizing RECARGA or WinSLAMM modeling software are expected to read and understand the user manual prior to submitting plans that include modeling results.
-*The DNR's Technical Standard [[https://dnr.wi.gov/topic/stormwater/documents/1002SiteEvalForInfiltr.pdf|Site Evaluation for Stormwater Infiltration 1002]] must be used to determine all design infiltration rates.
+The DNR's Technical Standard [[https://dnr.wisconsin.gov/sites/default/files/topic/Stormwater/1002SiteEvalForInfiltr.pdf|Site Evaluation for Stormwater Infiltration 1002]] must be used to determine all design infiltration rates.
-*Guidance for designing infiltration facilities can be found on the [[infiltration guidance]] page.
+Guidance for designing infiltration facilities can be found on the [[infiltration guidance]] page.