Exam 8: Floods, Catchment, and Irrigation

When the full supply level (F.S.L.) of the canal is much below the bed level of the drainage trough, then the cross drainage provided is called syphon aqueduct.

A unit hydro graph has one unit of

The capacity of escape channel should not be less than

For a catchment area of 120 km², the equilibrium discharge in m³/hour of an S-curve obtained by the summation of 6 hour unit hydro graph is

In order to estimate the high flood discharge in fan-shaped catchment, the formula used is

Interception losses are due to i. evaporation ii. transpiration iii. stream flow The correct answer is

To determine the discharge at a section in a stream from its rating curve, the required data are i. slope of water surface at the section ii. stage at the section iii. current meter readings at the section The correct answer is

The whole period of cultivation from the time when irrigation water is first supplied for preparation of the ground to its last watering before harvesting, is called

The primary cause of meandering is the excess of total charge during floods, when excess of turbulence is developed.

The flow-mass curve is graphical representation of

For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is

Instantaneous unit hydrograph is a hydrograph of i. unit duration ii. unit rainfall excess iii. infinitely small duration iv. infinitely small rainfall excess The correct answer is

When the drain is over the canal, the structure provided is known as

The crest level in a barrage is kept at a

If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be

A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If

The shape of recession limb of a hydrograph depends upon

A levee on flood

The stream which does not have any base flow contribution is called

The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000)willbe