PLEASE SHOW ALL YOUR WORK 623 Suppose an unconfined aquifer

PLEASE SHOW ALL YOUR WORK!!

6.2.3 Suppose an unconfined aquifer lies over a confined aquifer as shown in Figure P6.2.3. Determine the flow out of both aquifers. GS K1 30 m/day Impervious layer 82 m 75 m 50 m K2 = 60 m/day 900 m Figure P6.2.3

Solution

Solution:

We know darcy formula

q=kiA

K=coefficient of Permeability

i=hydraulic gradient

A=cross section area

Find k_{equivalent: When flow is parallel to bedding plane,}

K_eq=(K₁z₁+K₂Z₂)/(Z₁+Z₂)

=(30*32+60*50)/82

=48.29m/day

=48.29/(24*3600)

=5.59*10^-4m/s

i=h₁-h₂/ L

=82-75/900

=0.007

A=75*1=15m²

^{Discharge Is:}

q=5.59*10^-4 *0.007*75

=2.94*10^-4 m/s