Here is a graphical view of the nonlinear runoff processes in InfoSWMM and SWMM5:
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1. Three runoff surfaces
a. Impervious with Depression Storage
b. Pervious
c. Impervious without Depression Storage
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2. Evaporation
a. Constant
b. Time Series
c. Monthly
d. Temperature
e. Climate File
f. Monthly Adjustments for Climate Change
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3. Slope (same for all runoff surfaces) |
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4. Infiltration
a. Horton
b. Modified Horton
c. Green Ampt
d. Modified Green Ampt
e. Curve Number or SCS or CN
f. Monthly Adjustments for Climate Change for all Infiltration Methods
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5. Roughness (Manning’s n)
a. Impervious
b. Pervious
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6. Width or the Dimension of the Subcatchment (same for all runoff surfaces) |
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7. Wind Speed for Snowmelt
a. Climate File
b. Time Series
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8. Depression Storage
a. Impervious
b. Pervious
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9. Temperature for Snowmelt
a. Climate File
b. Time Series
c. Monthly Adjustments for Climate Change
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10. Other connected processes
a. LID Controls
b. Groundwater
c. Snowmelt
d. Water Quality
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11. Outlet
a. Node
b. Pervious Runoff Surface
c. Impervious Runoff Surface
d. Another Subcatchment
e. LID Controls
- i. Rain Garden
- ii. Green Roofs
- iii. Porous or Permeable Pavements
- iv. Bio Retention Cells
- v. Infiltration Trench
- vi. Vegetative Swales
- vii. Rain Barrel
- viii. Rooftop Disconnection
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12. Rainfall
a. Design Storms
b. Historical Storms
c. Long term NWS data or a Climate File
d. User Time Series
e. Monthly Adjustments for Climate Change
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