Table 6.4
Sample
flood-routing computations
Line on
Fig. 6.14
Time from
start of
flood, h
Length of
time interval
t, h
Instantaneous
inflow rate I,
cfs
Mean inflow rate
during interval
(I
1 + I
2 )/2 cfs
Vol. of inflow during
interval (4)
 (2)
 t/
24 ac-ft
Reservoir elev. at
end of interval, ft
Spillway discharge
rate at end of interval,
cfs
(1)
(2)
(3)
(4)
(5)
(6)
(7)
0
12
2000
–
–
430.0
0
12
12
3800
2900
2900
430.3
500
24
12
10,400
7100
7100
431.0
2000
36
12
52,400
31,400
31,400
433.6
12,000
AB
48
12
173,100
112,700
112,700
440.5
64,000
DE
54
6
221,400
197,200
98,600
444.6
106,000
GI
60
6
245,800
233,600
116,800
448.2
147,000
KJ
66
6
237,500
241,600
120,800
450.6
178,000
72
6
211,800
224,600
112,300
451.8
193,000
78
6
180,000
195,800
97,900
451.8
193,000
84
6
148,600
164,200
82,100
451.1
184,000
96
12
92,800
120,700
120,700
448.1
146,000
108
12
54,100
73,400
73,400
444.5
105,000
120
12
29,700
41,900
41,900
441.0
69,000
132
12
16,500
23,100
23,100
438.2
44,000
144
12
8800
12,600
12,600
436.1
28,000
156
12
4000
6400
6400
434.5
17,000
168
12
2500
3250
3250
433.4
11,000
180
12
2500
2250
2250
432.6
8000
192
12
2000
2000
2000
432.0
5000
6 Basic Hydrology, Water Resources, and DAF Boat Plant for Lake Restoration
263