General Pollutant Movement from a Snowpack

General Pollutant Movement from a Snowpack
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Early	Middle	Late	X
Character
High soluble content	Remaining solubles, beginning of fine- to medium-solids	High solids content
Low runoff volume, early infiltration	Large runoff volume	Large runoff volume (especially if rain-on-snow occurs), saturated soils
Initiated by chemical addition and/or solar radiation	Largely driven by solar radiation, aided by salt	Solar driven
Land Use Where Important
Low density	High density	High density
Residential/neighborhood	Roads, parking lots	Roads, highways
Open space	Snow storage sites	Commercial
BMP Focus
Infiltration	Pre-treatment (settling)	Pre-treatment (settling)
Dilution	Volume control	Filtration
Pollution prevention (salt, chemical application)	Detention/settling	Volume control
Retention		Pollution prevention (surface sweeping)
Wetlands/vegetation (infiltration, biological and soil uptake)		Detention/settling
Diffuse runoff paths		Wetlands/vegetation (filtration, settling)