ENGR3851/8951 Groundwater Flow and Pollution Assignment

ENGR3851/8951 Groundwater flow and pollution assignment 1
ENGR3851/8951 GROUNDWATER FLOW AND POLLUTION ASSIGNMENT
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ENGR3851/8951 Groundwater flow and pollution assignment 2
Part 1: Pump Test and Drawdown Tutorial
Question 1
Solution
Given; Pumping rate = 35 L/sec
Observation well distance = 17m
Transmissivity (T) is calculated using the Thiem Equation;
T = Kb = Q
2 π (s 1−s 2)ln ( r 2
r 1 )
Where; Q = well discharge rate in (m3/d) = 35 L/sec = 3024m3/d
r1, r2 = piezometer distances from pumping well = 17m, 5m
s1, s2 = steady-state drawdowns in piezometers (m) = 0.2m, 0.4m
T = Kb = 3024
2 π (0.4−0.2)ln ( 17
5 )
= 2943.74
Storativity (S) is derived from the Jacob’s Equations
S = 2. 25 Tto
r 2
From the graph,
T = 2.303 Q/ 4 πΔs
= 2.303 x 3024 / 4 π x 0.2
= 2769.88

ENGR3851/8951 Groundwater flow and pollution assignment 3
= 2. 25 x 2769 . 88 x 3024
17 x 17
= 65212
Question 2
Step 1
Distances of wells from spring = Spring coordinate x (m) + Well coordinate x (m)
Well 1 = 4100
Well 2 = 4100
Well 3 = 4100
Well 4 = 4200
Well 5 = 4200
Well 6 = 4200
Well 7 = 4300
Well 8 = 4300
Well 9 = 4300
Step 2
Total pump rate = 30 ML/day, divided by 9
= 3.33 ML/day
Step 3
Drawdown for each well;
Drawdown (Sw) = H-hw = Q
2 π T ln (R/r) where R is radius of influence, rw is well
radius
Well 1 = 0.4