The table below represents long-term average water balance components for Centra
ID: 235407 • Letter: T
Question
The table below represents long-term average water balance components for Central Long Island, New York. For this problem, estimate a) Gout (groundwater outflow), R (net recharge), and RI (recharge from infiltration) in inches/yr (if you have any difficulties reading the numbers, please just let me know), b) assuming that most of the ground-water flow occurs in the surficial sand and gravel aquifer, which has an average thickness of 200 feet and Sy=0.28, what is the average residence time of water ?
Quantity
in/year
P
44
ET
21.3
Q
9.8
CR
0.4
QGW
8.8
RSW
0
Gin
0
Quantity
in/year
P
44
ET
21.3
Q
9.8
CR
0.4
QGW
8.8
RSW
0
Gin
0
Explanation / Answer
a gout( ground water outflow)
QGW= Gin -Gout
=8.8=0- gout
gout= 8.8 inches/year
Net recharge=P-ET-Q+CR-QGW
=44-21.3-9.8+0.4-8.8
=4.5.inches/year
recharge from infiltration
recharge from infiltration+ CR=ET+QGW
=ET+QGW-CR
=21.3+8.8-0.4
29.7 inch/day
b.Sy=0.28
Residence time= Ratio of reservoir volume/input or ouput of reservoir
=0.28/P+CR
=0.28/44+0.4
=0.28/44.4
=6.3*10(-3)
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