Event mean concentrations for total suspended solids

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Event mean concentrations for total suspended solids.
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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		<10
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 lake 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.