Flood Routing And Flood Control Practice Questions

A flood control structure having an expected life of n years is designed by considering a flood of return period $T$ years. When $T=n$ , and $n\rightarrow \infty$ , the structure's hydrologic risk of failure in percentage is . (round off to one decimal place)

Muskingum method is used in

In a homogeneous unconfined aquifer of area 3.00 $km^2$ , the water table was at an elevation of 102.00 m. After a natural recharge of volume 0.90 million cubic meter ( $Mm^2$ ), the water table rose to 103.20 m. After this recharge, ground water pumping took place and the water table dropped down to 101.20 m. The volume of ground water pumped after the natural recharge, expressed (in $Mm^2$ and round off to two decimal places), is ______.

Superpassage is a canal cross-drainage structure in which

The probability that the annual maximum flood discharge will exceed 25000 $m^3/s$ , at least once in next 5 years is found to be 0.25. The return period of this flood event (in years, round off to 1 decimal place) is ____

For routing of flood in a given channel using the Muskingum method, two of the routing coefficients are estimated as $C_{0}=-0.25$ and $C_{1}= 0.55$ . The value of the third coefficient $C_{2}$ would be ______

A culvert is designed for a flood frequency of 100 years and a useful life of 20 years. The risk involved in the design of the culvert (in percentage, up to two decimal places) is______

The type of flood routing (Group I) and the equation(s) used for the purpose (Group II) are given below. The correct match is

In reservoirs with an uncontrolled spillway, the peak of the plotted outflow hydrograph

The Muskingum Model of routing a flood through a stream reach is expressed as $O_{2}=K_{0}I_{2}+K_{1}I_{1}+K_{2}O_{1}$ , where $K_{0}$ , $K_{1}$ and $K_{2}$ are the routing coefficients for the concerned reach, $I_{1}$ and $I_{2}$ are the inflows to reach, and $O_{1}$ and $O_{2}$ are the outflows from the reach corresponding to time step 1 and 2 respectively. The sum of $K_{0}$ , $K_{1}$ and $K_{2}$ of the model is

A conventional flow duration curve is a plot between

A 1-h rainfall of 10 cm magnitude at a station has a return period of 50 years. The probability that a 1-h rainfall of magnitude 10 cm or more will occur in each of two successive years is:

The correct match of Group I Group II is

A flood wave with a known inflow hydrograph is routed through a large reservoir. The outflow hydrograph will have

When the outflow from a storage reservoir is uncontrolled as in a freely operating spillway, the peak of outflow hydrograph occurs at

A linear reservoir is one in which

The stage-discharge relation in a river during the passage of flood is measured. If $q_f$ is the discharge at the stage when water surface is falling and $q_r$ is the discharge at the same stage when water surface is rising, then