Question 1 The storage - outflow relationshipfor a small dam is given in Table 1. The inflow hydrograph for theuncontrolled spillway of this dam is tabulated in Table 2.Determine:
- the outflow hydrograph from the spillway (fill the table andadd more rows if necessary),
- attenuation, translation, and lengthening in the base time ofthe outflow hydrograph.
- Draw inflow and outflow hydrographs on the same figure and showthe parameters asked in part b on this figure (draw in Excel andpaste it here).
- Comment on the location of peak discharge of outflowhydrograph, i.e. why is it coincident with the inflowhydrograph?
Hint: Use Table 1 values to obtain S=f(Q).
Table 1
Q (m³/s) | 50 | 100 | 150 | 200 | 250 |
2S/Δt(m³/s) | 300 | 450 | 600 | 750 | 900 |
Table 2
t
(hr) | Inflow
(m³/s) | |
0 | 45 | |
2 | 175 | |
4 | 370 | |
6 | 540 | |
8 | 390 | |
10 | 280 | |
12 | 215 | |
14 | 175 | |
16 | 135 | |
18 | 100 | |
20 | 70 | |
22 | 45 | |
