filterstrip.str

This file contains the filter strip parameters.

A filter strip is a strip of dense vegetation located to intercept runoff from upslope pollutant sources and filter it. Filter strips remove contaminants by reducing overland flow velocity which results in the deposition of particulates. The filter strip area also acts as an area of increased infiltration, reducing both the runoff volume and non-particulate contaminants. The filter strip algorithm used in SWAT+ was derived from White and Arnold (2009). Filter strips reduce sediment, nutrients, bacteria, and pesticides, but do not affect surface runoff in SWAT+.

Field	Description	Type	Unit	Default	Range
name	Name of filter strip record	​string	​n/a	n/a	n/a
flag_fs	Currently not used	integer
fld_vfs	​Ratio of field area to filter strip area	real	ratio	10.0	0.0-300.0
con_vfs	​Fraction of flow entering the most concentrated 10% of the filter strip	real	fraction	0.50	0.25-0.75
cha_q	​Fraction of fully channelized flow	real	%	90.0	0.0-100.0

References:

White, Michael J. and Arnold, Jeff G. (2009): Development of a simplistic vegetative filter strip model for sediment and nutrient retention at the field scale. Hydrological Processes 23, 1602– 1616. DOI: 10.1002/hyp.7291