CHAPTER8. GROUNDWATBR FLOW 9. The aquifer of Fig.(88) has a yield porosity of 34

Question

CHAPTER8. GROUNDWATBR FLOW 9. The aquifer of Fig.(88) has a yield porosity of 34.0%, a retention porosity of 19.2% and a hydraulic conductivity of 160 m/d. (a) How long does it take for water to move from well A to well B? (b) What volume of water passes any cross section in 10.0 d? (c) Assuming that all pores below the water table are filled, find the total volume of water trapped in the rock between the wells. 3.27 km 660 m 47.0 .28.0 m 35.0 ml . Fig.(8.8) Problem 9 ollt emressed either in units

Explanation / Answer

Answer- Given- Yield Porosity = 34% , Retention Pososity = 19.2%

total porosity = yield porosity+ retention porosity = 34+19.2= 49.2%

Hydraulic conductivity= 160m/day

the horizontal distance between Well A and B is = 3.27km = 3270m

hi = 35+28m = 63m, h2= 35m

dh = h1-h2 = 63-35 = 28m

velocity v = k*i (hydraulic gradient = dh/l) = 160*28/3270 = 1.37m/day

time taken by the flow of water from well A to Well B = distance/velocity = 3270/1.37= 2386.8day

Answer- the volume water trapped in the rocks between the wells = 660*(35+28)*0.492 = 20457m3

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