Irrigation is the Science of providing water to the lands in accordance with the requirements of the crops grown therein. It has been found to increase the productivity of rain-fed lands by as much...
Tekla Structures 19 - Civil Engineering Community
Tekla Structures 19 - Civil Engineering Community
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Studies the various Data Structures and Algorithms to unleash their performance and suitability.
Studies the various Data Structures and Algorithms to unleash their performance and suitability.
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'I V T
943
RESERVOIRS AND PLANNING FOR DAM RESERVOIRS
(xi) Outflow ordinates are plotted so as to obtain the outflow hydrograph. The point at which it crosses the inflow hydrograph gives the peak outflow rate. From this time, the rate of outflow begins to fall due to decrease in the inflow rate. (xii) The time lag between the two peaks is evaluated as to give the time lag.
An example has been solved to make the procedure very clear. Example 18.13. The inflow flood discharges for a possible worst flood are tabulated in Table 18.22 at suitable intervals starting from 0.00 hours on august 20, 1975. Table 18.22 T ~ m efrom stari in hr
Thisflood approaches a reservoir with an uncontrolled spillway, the crest of which is kept at RL 140.0 m. Determine the maximum reservoir level and the hydrograph of the routed flood. Values of reservoir capacity'(above spillway crest) and outflow discharge at various elevations are tabulated in Tables 18.23 and 18.24 respectively. Table 18.23
.
Elev~~tion in metres
140.0
141.0
142.0
143.0
Reservoir storage with spillway crest as datum inmillion crtblc metres (m.c.rn.)
0.0
15.0
35.0
-60.0-
145.0
146.0
95.0----140.0-
240.0
144.0
I
Table 18.24 Elevation
Outfow discharge in cumecs
140.0
0
Solution. The elevation storage curve and the elevation outflow curve are plotted with the help of Tables 18.23 and 18.24, as shown in Fig. 18.20 and 18.21 respectively. The hydrograph of the given flood is plotted in Fig. 18.22. Flood routing is carried out by hit and trial method as shown in Table 18.25 and as explained earlier. This table is otherwise self-explanatory.
