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Modeling LID-units in SWMM

Mogenfelt, Petter LU (2017) In TVVR 17/5022 VVR820 20171
Division of Water Resources Engineering
Abstract
The LID control in US EPA SWMM5 includes modeling of Green-Ampt infiltration through the soil layer which assumes that only matrix flow is present. The LID control also models drainage through perforated underdrains. In this study, data and premade PCSWMM models, utilizing the SWMM5 engine, were provided for two test sites in North America. The models showed limitations in modeling soil flow and the comprehensiveness of modeling underdrains. Literature research and runs with modifications to the PCSWMM models indicated that macropore flow was also present for both sites due to the in-situ observed rapid percolation response. Furthermore, the underdrain flow modeling in the LID control was perceived as insufficient in addition to lacking... (More)
The LID control in US EPA SWMM5 includes modeling of Green-Ampt infiltration through the soil layer which assumes that only matrix flow is present. The LID control also models drainage through perforated underdrains. In this study, data and premade PCSWMM models, utilizing the SWMM5 engine, were provided for two test sites in North America. The models showed limitations in modeling soil flow and the comprehensiveness of modeling underdrains. Literature research and runs with modifications to the PCSWMM models indicated that macropore flow was also present for both sites due to the in-situ observed rapid percolation response. Furthermore, the underdrain flow modeling in the LID control was perceived as insufficient in addition to lacking options for two outlets. Hence, modified code with additional options was developed for the underdrain code in the LID control including partially submerged orifices, Manning’s equation and dual outlets. The code was tested in the provided models with promising results. Although dual outlets are not commonly mentioned in design manuals, the results in the study showed potential gains both in terms of water treatment and reduced peak flows (Less)
Please use this url to cite or link to this publication:
author
Mogenfelt, Petter LU
supervisor
organization
course
VVR820 20171
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
DRAINMOD, SWMM, storm water modeling, LID, LOD, SUDS, bio-retention cells, EPA, underdrains
publication/series
TVVR 17/5022
report number
17/5022
ISSN
1101-9824
language
English
additional info
Examiner: Professor Ronny Berndtsson
id
8928265
date added to LUP
2017-11-29 13:59:44
date last changed
2017-11-29 13:59:44
@misc{8928265,
  abstract     = {The LID control in US EPA SWMM5 includes modeling of Green-Ampt infiltration through the soil layer which assumes that only matrix flow is present. The LID control also models drainage through perforated underdrains. In this study, data and premade PCSWMM models, utilizing the SWMM5 engine, were provided for two test sites in North America. The models showed limitations in modeling soil flow and the comprehensiveness of modeling underdrains. Literature research and runs with modifications to the PCSWMM models indicated that macropore flow was also present for both sites due to the in-situ observed rapid percolation response. Furthermore, the underdrain flow modeling in the LID control was perceived as insufficient in addition to lacking options for two outlets. Hence, modified code with additional options was developed for the underdrain code in the LID control including partially submerged orifices, Manning’s equation and dual outlets. The code was tested in the provided models with promising results. Although dual outlets are not commonly mentioned in design manuals, the results in the study showed potential gains both in terms of water treatment and reduced peak flows},
  author       = {Mogenfelt, Petter},
  issn         = {1101-9824},
  keyword      = {DRAINMOD,SWMM,storm water modeling,LID,LOD,SUDS,bio-retention cells,EPA,underdrains},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVVR 17/5022},
  title        = {Modeling LID-units in SWMM},
  year         = {2017},
}