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WorksheetsDay 49-Nov 9-worksheet-Diploma-infiltration,runoff,hydrograph
Total questions: 15
Worksheet time: 11mins
In Horton’s equation, infiltration capacity decreases —
Linearly
Exponentially
Logarithmically
Parabolically
Average rainfall intensity above which rainfall becomes runoff is called ————
(a)
If rainfall intensity is less than Φ-index, runoff is —
Maximum
Zero
Constant
Equal to infiltration
The falling limb of a hydrograph is controlled mainly by —
Rainfall intensity
Catchment characteristics
Wind velocity
Direction of rainfall
A fan-shaped catchment gives —
Low peak hydrograph
High peak hydrograph
Flat crest
Right-skewed hydrograph
Unit Hydrograph concept becomes unreliable when basin area —
Exceeds 5000 km2
Is free of storage
Is compact
Has uniform rainfall
Recession limb depends mainly on basin characteristics.
True
False
W-index is always greater than Φ-index.
True
False
Assertion (A): UH assumes runoff response of the basin does not change with time. Reason (R): This is known as time-invariance.
A and R true; R explains A
A and R true; R does not explain A
A true; R false
A false; R true
Point where surface flow contribution ends is (a) .
Flood hydrograph is also called ________.
Storm hydrograph
Unit hydrograph
Baseflow hydrograph
Dry weather hydrograph
Rainfall that generates runoff after satisfying all losses is (a) .
Fern-shaped catchment has (a) time of concentration.
Hourly intensities: [1, 3, 6, 2, 7, 4] cm/hr; Φ-index = 3.5 cm/hr. Find runoff depth.
(a)
Discharge (m^3/s): [20, 50, 80, 60, 40, 25]; Baseflow = 20m3/s ; Area = 180km2 . Find direct runoff depth (mm).
(a)
