Where does the N and Q2 come from in part b? 5 ully penetrating a confined aquif

Question

Where does the N and Q2 come from in part b? 5 ully penetrating a confined aquifer is pumped at constant rate of transmissivity is 1,000 m2/day, and storage coefficient is 0.0004. (a) Determine 500 m from the pumped well after 1.5 days of pumping. (b) Suppose the ine the drawdown at a distance 1,500 m from the pumped well one Example 7.6 A high-capacity discharge well f 5,000 m3/day. The aquifer transmissivity is 1,000 m m/day. The aquifer the drawdown at a distance of 1, pump is shut off after 1.5 days. Determ y ater pumping has stopped. (c) Explain the difference between the results of parts (a) and cb) olution ay after pumping has stop (o) Explain the difference between the results of parts (a) and (b). (a) By using Equation 7.20 (1,500)2(0.0004) ( 1,000)( 1.5) As 11 0.15 = From Table 7.3, we obtain wou) 1.523. Therefore, by using Equation 7.21, 2 s = 4 w(11) = 5,000 ·4m( 1,000) (1.523) 0.61 m (b) For this case, we will use the concept of superposition for unsteady well flow because the well discharge is not constant during the study period. This requires the use of Equation 7.24, with 5,000 m3/day, Q2 = 0, O = 0, and ti = 1.5 days. N = 2, = 0, Qi

Explanation / Answer

Here N is taken as number of days and Q2 is the discharge.

For first day,

Number of days, N=1

Discharge,Q1=5000 m3/day

For second day,

Number of days, N=2

Discharge,Q2=0 m3/day

The reason was after first day the discharge of the well was stopped.And the discharge for the end of the day is "Zero". The second day it was starting again from "Zero" only. So that's why N=2 and Q2=0 m3/day.

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