Travel Time Problem

Solution:

head change = dh ~ 119-106 = 13 m --> 13m*3.28ft/m = 42.6 ft

length = 20 miles --> 20mi*5280ft/mi = 105600 ft

hydraulic gradient = dh/dl = 42.6ft/105600ft = 0.0004034

hydraulic conductivity = K = 150 ft/day

porosity = n = 0.3

seepage velocity = v = Ki/n = 150ft/day0.0004034/0.3 = 0.2017 ft/day

travel time = t = length/v = 105600ft/0.2017ft/day = 523,538 days = 1434 years