Contaminant Risk Factors - Urban Watersheds: Geology, Contamination, and Sustainable Development - page 343

Areal recharge

Area
contributing
recharge

Discharging
well

Land surface

Screened
interval

Bounding
flowpaths

FIGURE 10.2
Example recharge area. (From United States Geological Survey (USGS), Estimating Areas Contributing to Recharge
of Wells , USGS Circular 1174, Denver, CO, 1998.)

Mixed effect
Residential zone (Low risk)

Industrial zone (High risk)

Well
capture
zone

Plating
industrial
site

(a)

Edge effect

Residential zone (Low risk) Industrial zone (High risk)

Well capture
zone

(b)

Parcel/standard industrial classification (SIC) based resolution

2120 Residential 5171 2810

Well capture
zone

Right of way

5514 2811 7358 3499

5171, 7358 = SIC codes =Parcel boundary

km

(c) 0 1

FIGURE 10.3
Effects of different spatial resolutions across multiple land use types on surface risk.