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Event mean concentrations for total suspended solids

Event mean concentrations for total suspended solids
Event mean concentrations for total suspended solids.
Land cover/land use Range (mg/L) Recommended value (mg/L) Notes
Commercial 42-164 75 If applicable to models being used, adjust curve numbers/runoff coefficients when calculating loads
Industrial 70-170 93 If applicable to models being used, adjust curve numbers/runoff coefficients when calculating loads
Residential 42-101 73  
High-density/Multi-family residential   Calculate Insufficient information to recommend a specific emc
Medium density residential   Calculate Insufficient information to recommend a specific emc
Low density residential   Calculate Insufficient information to recommend a specific emc
Freeways/transportation 50-90 87  
Mixed 47-188 76 or calculate
  • Residential land use was the primary land use in most studies that cited values for mixed land use
  • If the study area can be delineated into specific land uses and impervious area for each land use is know, we recommend calculating the emc
Parks and recreation   Use value for open space or calculate emc will be a function of vegetative cover
Open space 11-70 21  
Conventional roof   <20  
Institutional 17-140 80  
Forest/shrub/grassland 26-140 72 Sediment concentrations from forested areas vary widely with factors such as slope and forest condition. Concentrations may be very high, but the annual volume of runoff is typically much less than non-forested areas.
Open water and wetlands   see Notes (next column)
  • If data exist, use the TSS concentration for the water body of interest
  • If data for a specific water body do not exist, use data from similar lakes in the area
Cropland (row crops) 50-160   Literature review was not adequate to recommend an emc
Pasture 75-150 84 Concentrations are a function of intensity of use.
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