1. Determining Groundwater Contamination

2. Determining Groundwater Contamination
Darcy’s Law
V = K ΔH ΔL
Questions:
2a) ΔH = elevation at storage drum(ft) – elevation threatened well(ft)
ΔL = distance from storage drum to well
ΔH = rate at which groundwater flows (ft/mi)

3. 2b)
Velocity = K ΔH Final answer in ft/day ΔL
K= 100 ft/day
1 mile = 5280 ft
2c)
Time = distance Final answer in years
velocity

4. Practice Problem #1
ΔH = elevation at storage drum(ft) – elevation threatened well(ft)
ΔH = 53 ft – 49 ft = 4ft
ΔL = distance from storage drum to well *this needs to be in miles*
ΔL = ft = miles
5,280 ft/mi
ΔH = rate at which groundwater flows (ft/mi) = ft
ΔL mi
= 160 ft/mi

5. b) V = K ΔH ΔL
V = 10 ft 160 ft 1 mile
day mile 5,280 ft
= 0.30 ft/day
c) Time = distance (ft)
velocity (ft/day)
Time = 133 ft 1 day yr
0.30 ft days
= 1.21 years

6. Practice Problem #2
ΔH = elevation at storage drum(ft) – elevation threatened well(ft)
ΔH = 70 ft – 50 ft = 20 ft
ΔL = distance from storage drum to well *this needs to be in miles*
ΔL = ft = miles
5,280 ft/mi
ΔH = rate at which groundwater flows (ft/mi) = ft
ΔL mi
= ft/mi

7. b) V = K ΔH ΔL
V = 12 ft ft 1 mile
day mile ,280 ft
= 1.98 ft/day
c) Time = distance (ft)
velocity (ft/day)
Time = 121 ft 1 day yr
1.98 ft days
= years