ESE 2021 Technical Quiz || Reservoir and Channel Routing

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Question 1

A new reservoir has a capacity of 12 Mm³ And its catchment area is 400 km². The annual sediment yield from this catchment is 0.1 ha m/km² and the trap efficiency can be assumed constant at 90%. The number of years it takes for the reservoir to lose 50% of its initial capacity is, nearly

• A177 years
• B77 years
• C17 years
• D7 years

Question 2

Which of the following is incorrect regarding linear reservoir?

• AThe weightage factor, x= 0
• BStorage S depends only on Q (outflow rate)
• CStorage S depends on both Inflow and Outflow rate
• DAll the options are incorrect

Question 3

A channel has an inflow of 50 cumec at time t=0, at the same time the channel has an outflow of 30cumec after certain time it was observed to have an inflow of 60 cumec with an outflow 45cumec. The change in storage depth is 20m³. The flood hydrograph with the weighing factor 0.3. Determine the storage time constant.

• A1.55h
• B1.48h
• C1.25h
• D1.65h

Question 4

The routing expression as per Muskingham method of the channel routing is given as

Determine value of C₁ considering storage constants k = 10hrs and x = 0.22 and time step Δt for routing is 6hrs

• A0.12
• B0.27
• C0.35
• D0.48

Question 5

The plan area of a reservoir is 1 km². The water level in the reservoir is observed to decline by20 cm in a certain period. During this period the reservoir receives a surface inflow of 10 hectare–meters, and 20 hectare–meters are abstracted from the reservoir for irrigation and power. The pan evaporation and rainfall recorded during the same period at a near by meteorological station are 12 cm and 3 cm respectively. The calibrated pan factor is 0.7. The seepage loss from the reservoir during this period in hectare–meters is

• A0.0
• B1.0
• C2.4
• D4.6

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