A retarding basin has storage and discharge characteristics as given below. The dam has an ungated sluice 1.5 m diameter with its center at elevation 157.5 m and a spillway at crest elevation 226.5 m. Discharge given below for pool elevations above 226.5 m include both sluice and spillway discharge. The inflow hydrograph is also given below. Route the flood through the reservoir using ISD and Modified Puls Method. Determine the maximum pool elevation reached, the reduction in flood peak and the reservoir lag. Pool elevation at commencement = 157.8 m (for which the discharge = 5.95 cumec).
A retarding basin has storage and discharge characteristics as given below. The dam has an ungated sluice 1.5 m diameter with its center at elevation 157.5 m and a spillway at crest elevation 226.5 m. Discharge given below for pool elevations above 226.5 m include both sluice and spillway discharge. The inflow hydrograph is also given below. Route the flood through the reservoir using ISD and Modified Puls Method. Determine the maximum pool elevation reached, the reduction in flood peak and the reservoir lag. Pool elevation at commencement = 157.8 m (for which the discharge = 5.95 cumec).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A retarding basin has storage and discharge characteristics as given below. The dam has an ungated sluice 1.5 m diameter with its center at elevation 157.5 m and a spillway at crest elevation 226.5 m. Discharge given below for pool elevations above 226.5 m include both sluice and spillway discharge. The inflow hydrograph is also given below. Route the flood through the reservoir using ISD and Modified Puls Method. Determine the maximum pool elevation reached, the reduction in flood peak and the reservoir lag. Pool elevation at commencement = 157.8 m (for which the discharge = 5.95 cumec).
Transcribed Image Text:Storage (ham)
(= 10'm)
Pool Elun.
Discharge
(ситее)
(m)
157.5
0.085
3.9
159
0.368
17.3
162
1.33
29.8
168
7.6
45.5
174
21.2
57.0
180
43.8
66.7
186
80.4
75.0
192
136.0
82.8
198
208
89.5
204
297
96
210
400
102
216
520
108
299
655
114
225
728
116
226.5
764
117
227.4
787
119
298.0
805
289
Pool Elevation vs Storage and Discharge data
Time
Inflow
Time
Inflow
(ситее)
(hr)
(ситес)
(hr)
15
36
141
57
42
93
12
159
48
60
18
258
54
33
24
240
GO
18
30
198
Inflow hydrograph Data
Hint: Take Routing period t = 6 hours or ¼ day
Also, draw the curves of "pool elevation vs. outflow", "outflow vs S+ Ot/2" for ISD Method and
"outflow vs. 25/t ± 0" for modified Puls method.
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