Example 1.4 The storage capacity in a reservoir at certain period is given as 9.5 ha-m. The inflow and outflow of reservoir is recorded as 25 m³/s and 16.5 m³/s, respectively. However, the inflow and outflow is changed to 20 m3/s and 22 m3/s, respectively after four (4) hours. (a) Calculate change of storage capacity in the reservoir during the four hours period. (a) Calculate total storage at the end of four hours Give answers in cubic-meter.

7. When just full, a reservoir has a surface area of 0.8 km², and this area is approximately constant as the water depth above this level, h, increases (where h is in metres). The outflow from the reservoir is given (in m³/s) by the formula O = 90 h¹² Consider a scenario in which this reservoir is subjected to a flood with flow rates given in the table below. 0 1 3 4 5 Time (hours) Inflow (m³/s) 2 22 12 0 18 6 0 a) What is the total volume of water represented by this flood? b) Carry out a flood storage routing calculation. Find the maximum water depth in the reservoir and its maximum outflow rate, and the time when this occurs.

The average annual discharge of a river for 11 years is as follows: 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 Discharge(m/s) 1750 2650 3010 2240 2630 3200 1000 950 1200 4150 3500 Determine the storage capacity required to meet a demand of 2000 m'/s throughout the year using Mass Curve Method? Years

The flow net constructed for a dam is shown in the figure below. Taking coefficient of permeability as 3.8 x 10-6 m/s, the quantity of flow (in cm3/ sec) under the dam per m is 50m 6.3m |1.6m :4 9.4m 17.2m Impermeable stratum