Test: Dam Arid Reservoirs

QUESTION: 1

The ‘dead storage’ in a dam reservoir, is the available volume for collection of silt and sediment, between

A.
bed level of the reservoir and minimum reservoir level
B.
bed level of the reservoir and the silt level in the reservoir
C.
bed level of the reservoir and the normal pool level
D.
None of the above

Solution:

QUESTION: 2

‘Bank storage’ in a dam reservoir:

A.
increases the computed reservoir capacity
B.
decreases the computed reservoir capacity
C.
sometimes increases and sometimes decreases the computed reservoir capacity
D.
has no effect on computed reservoir capacity

Solution:

When the reservoir is filled up, certain amount of water seeps into the permeable reservoir banks. This water comes out as seen as the reservoir gets depleted. This volume of water is known as bank storage. The bank storage efficiently increases the capacity of the reservoir.

QUESTION: 3

Design yield of a storage reservoir is kept:

A.
higher than its firm or safe yield
B.
lower than its firm or safe yield
C.
equal to its firm or safe yield
D.
higher or lower than the firm yield, depending upon the designer’s intuition.

Solution:

QUESTION: 4

With the reduction in reservoir capacity over the passage of time, the trap efficiency

A.
increases
B.
decreases
C.
remains unaffected
D.
may increase or decrease, depending upon the reservoir characteristics

Solution:

QUESTION: 5

Trap efficiency of a storage reservoir is defined as

A.
Total annual seiment inflow/Reservoir capacity
B.
Total sediment deposited in a given period/Total sediment inflow in that period
C.
Total annual seiment deposited in the reservoir/Dead storage capacity of the reservoir
D.
None of the above

Solution:

QUESTION: 6

Capacity-inflow ratio for a storage reservoir is defined as

A.
Reservoir capacity/Average annual flood in flow
B.
Reservoir capacity/Average annual sediment in flow
C.
Dead storage capacity of the reservoir/Average annual sediment deposited
D.
None of the above

Solution:

Capacity-inflow ratio can be defined as the ratio of the reservoir capacity to the total inflow of water. The trap efficient is a function of the capacity-inflow ratio which is represented by a graph between them.

QUESTION: 7

With the increase in its capacity-inflow ratio, the trap efficiency of a reservoir: