WinSLAMM v 9.4 Catchbasins/ Hydrodynamic Devices Tab 5-D John Voorhees, PE, PH PV & Associates LLC Using WinSLAMM to Meet TMDL, LID, and MS4 Stormwater Requirements University of Wisconsin Engineering Professional Development Pyle Center, Madison, WI April 26-27, 2011
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WinSLAMM v 9.4 Catchbasins/ Hydrodynamic Devices Tab 5-D John Voorhees, PE, PH PV & Associates LLC Using WinSLAMM to Meet TMDL, LID, and MS4 Stormwater.
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WinSLAMM v 9.4 Catchbasins/
Hydrodynamic Devices Tab 5-D
John Voorhees, PE, PH
PV & Associates LLC
Using WinSLAMM to Meet TMDL, LID, and MS4 Stormwater Requirements
University of Wisconsin Engineering Professional Development
Pyle Center, Madison, WI
April 26-27, 2011
We will cover . . .
Research Results Entering
Catchbasin Data into the Model
Model Output Variable
Sensitivity
Catchbasins . . .
Are Inlets or Manholes
Must Contain a Sump
Are not very useful if streets are also swept
Are applied as drainage controls
Device Performance
Model most suited to determining device performance in parallel
Can evaluate devices in series by running separate models with increasing flows
Device performance a function of flow and area
Manholes
Parallel Collection System
Inlets with Sumps
Series Collection System
Research Results A New Jersey study (Pitt, et al, 1994)
found average removal rates of 32% for suspended solids using catchbasins with a suitable sump.
Pitt & Shawley (1982) found cleaning catchbasin twice per year reduced total residue yields between 10% and 25%.
Pitt & Field (2004) found sediment in catchbasins were the largest particles washed from streets.
Four Components to Modeling Catchbasins
1. Device Density
2. Device Geometry
3. Flow and Particle Size Data
4. Device Cleaning Information
Catchbasins
To Access Catchbasin Device Data
Access the Catchbasin or Drainage Control
Menu to view the Catchbasin Device data
Catchbasin Density
Geometry Information
Use average values for the drainage basin
you are modeling
Inflow Bypass Data
Hydrodynamic Devices Only
Inflow Bypass Data
Two Options – Either User-defined
Maximum Flow, or . . .Hydrodynamic Devices Only
Inflow Bypass Data
Defined Flow Diversion Geometry Hydrodynamic
Devices Only
Lamella Plates or Tube Settlers are also an option(See Hydrodynamic Device discussion)
Flow and Particle Size Data
Catchbasin Cleaning
Information
Calculated Settling Velocity
0.01
0.1
1
10
100
1000
10000
1 10 100 1000
Particle Size (microns)V
elo
cit
y (
ft/h
r)
Settling Velocity (ft/hr) Settling Velocity (ft/hr), R > 0.5
Catchbasin Performance Algorithms
Settling modeled as a detention basin assuming:
Vertical sides No storage
Flow rate calculated using Complex Triangular Hydrograph