InfoSWMM

#INFOSWMM

InfoSWMM

Building a DWF Pattern in InfoSWMM and InfoSWMM SA

Building a DWF Pattern

Time Patterns allow external Dry Weather Flow (DWF) to vary in a periodic fashion. They consist of a set of adjustment factors applied as multipliers to a baseline DWF flow rate or pollutant concentration. The different types of time patterns include:

  • Monthly – one multiplier for
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InfoSWMM, InfoSWMM, InfoSWMM_SA, SWMM5

APPENDIX A – Useful Tables for InfoSWMM and SWMM5

APPENDIX A – Useful Tables for InfoSWMM and SWMM5

A.1 Units of Measurement

Parameter US CUSTOMARY SI/METRIC
Area (Subcatchment) acres Hectares
Area (Storage Unit) square feet square meters
Area (Ponding) square feet square meters
Capillary Suction inches millimeters
Concentration mg/L

ug/L

Count/L

mg/L

ug/L

Count/L

Decay Constant (Infiltration) 1/hours 1/hours
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