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SWC 222 Surface Hydrology and Soil Conservation (2+1)

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Part 1 of 3 - 7.0/ 7.5 Points

Question 1 of 31 0.5/ 0.5 Points

Thiesson polygon is

A. A polygon obtained by joining adjoining raingauge stations

B. A representative area used for weighing the observed station precipitation

C. An area used in the construction of depth-area curves

D. The descriptive term for the shape of the hydrograph

Answer Key: B

Question 2 of 31 0.5/ 0.5 Points

A stilling well is required when the stage measurement is made by employing a

A. bubble gauge

B. float gauge recorder

C. Vertical staff gauge

D. inclined staff gauge

Answer Key: B

Question 3 of 31 0.5/ 0.5 Points

Which of the following instruments is not connected with stream flow measurement

A. hygrometer

B. echo depth recorder

C. electro-magnetic flow meter

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D. sounding weight

Answer Key: A

Question 4 of 31 0.5/ 0.5 Points

Orographic precipitation occurs due to air masses being lifted to higher altitudes by

A. the density difference of air masses

B. a frontal action

C. the presence of mountain barriers

D. extra tropical cyclones

Answer Key: C

Question 5 of 31 0.5/ 0.5 Points

An intermittent stream

A. Has water table above the stream bed throughout the year

B. Has only flash flows in response to storms

C. Has flows in the streams during wet season due to contribution of ground water

D. Does not have any contribution of groundwater at any time.

Answer Key: C

Question 6 of 31 0.5/ 0.5 Points

An isohyets is a line joining points having

A. equal evaporation value

B. equal barometric pressure

C. equal height above the MSL

D. equal rainfall depth in a given duration

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Answer Key: D

Question 7 of 31 0.5/ 0.5 Points

A hyetograph is a plot of

A. cumulative rainfall vs time

B. rainfall intensity vs time

C. rainfall depth vs duration

D. discharge vs time

Answer Key: B

Question 8 of 31 0.5/ 0.5 Points

A storm hydrograph was due to 3 h of effective rainfall. It contained 6 cm of direct runoff. The ordinates of

DRH of this storm

A. When divided by 3 give the ordinates of a 6-h unit hydrograph

B. When divided by 6 give the ordinates of a 3-h unit hydrograph

C. When divided by 3 give the ordinates of a 3-h unit hydrograph

D. When divided by 6 give the ordinates of a 6-h unit hydrograph

Answer Key: B

Question 9 of 31 0.5/ 0.5 Points

Base flow separation is performed

A. On a unit hydrograph to get the direct runoff hydrograph

B. On a flood hydrograph to obtain the magnitude of effective rainfall

C. On flood hydrograph to obtain the rainfall hydrograph

D. on hydrographs of effluent streams only

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Answer Key: B

Question 10 of 31 0.5/ 0.5 Points

Virgin flow is

A. The flow in the river downstream of a gauging station

B. The flow in the river upstream of a gauging station

C. The flow unaffected by works of man

D. The flow that would exist in the stream if there were no abstractions to the

precipitation

Answer Key: C

Question 11 of 31 0.5/ 0.5 Points

The monthly rainfall at a place A during September 1982 was recorded as 55 mm above normal. Here the

term normal means

A. The rainfall in the same month previous year

B. The rainfall was normally expected based on previous months data

C. The average rainfall computed from past 12 months record

D. The average monthly rainfall for September computed from a specific 30 years of

past record

Answer Key: D

Question 12 of 31 0.0/ 0.5 Points

Evaporation is confined to

A. to daylight hours

B. Night time only

C. land surfaces only

D. none of these

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Answer Key: A

Question 13 of 31 0.5/ 0.5 Points

The term base flow denotes

A. delayed groundwater flow reaching a stream

B. delayed groundwater and snow melt reaching a stream

C. delayed groundwater and interflow

D. the annual minimum flow in a stream

Answer Key: A

Question 14 of 31 0.5/ 0.5 Points

The depth of rainfall excess under a unit hydrograph is

A. 1 cm

B. 0.1 cm

C. 10 cm

D. 100 cm

Answer Key: A

Question 15 of 31 0.5/ 0.5 Points

The standard recording raingauge adopted in India is of

A. weighing bucket type

B. natural siphon type

C. tipping bucket type

D. telemetry type

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Answer Key: B

Part 2 of 3 - 6.5/ 6.5 Points

Question 16 of 31 0.5/ 0.5 Points

Due to sheet erosion shallow soils suffer greater reduction in productivity than deep soils.

True

False

Answer Key: True

Question 17 of 31 0.5/ 0.5 Points

When intensity of rainfall exceeds the infiltration rate of soil, there is no runoff.

True

False

Answer Key: False

Question 18 of 31 0.5/ 0.5 Points

Frequent rains will not increase the runoff and soil erosion.

True

False

Answer Key: False

Question 19 of 31 0.5/ 0.5 Points

Virgin flow is the flow in the river stream upstream of a gauging station.

True

False

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Answer Key: False

Question 20 of 31 0.5/ 0.5 Points

A mass curve of rainfall is always a raising curve.

True

False

Answer Key: True

Question 21 of 31 0.5/ 0.5 Points

Direct runoff is made up of surface runoff, prompt interflow and channel precipitation.

True

False

Answer Key: True

Question 22 of 31 0.5/ 0.5 Points

Base flow is separated from a Direct Runoff Hydrograph.

True

False

Answer Key: False

Question 23 of 31 0.5/ 0.5 Points

About 95% of the soil is splashed by falling rain drops.

True

False

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Answer Key: True

Question 24 of 31 0.5/ 0.5 Points

The presence of roots of vegetation helps in reducing soil erosion.

True

False

Answer Key: True

Question 25 of 31 0.5/ 0.5 Points

The coarse sandy soil will lead to heavy runoff.

True

False

Answer Key: False

Question 26 of 31 0.5/ 0.5 Points

The ground water depletion curves are not of the same pattern for all the storms in a drainage basin.

True

False

Answer Key: False

Question 27 of 31 0.0/ 0.0 Points

The inflection point signifies gradual withdrawal of catchment storage.

True

False

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Answer Key: True

Question 28 of 31 0.5/ 0.5 Points

An ephemeral steam does not have base flow contribution.

True

False

Answer Key: True

Question 29 of 31 0.0/ 0.0 Points

The annual soil erosion rate in India is 2052 M tons.

True

False

Answer Key: False

Question 30 of 31 0.5/ 0.5 Points

The Double mass curve technique is adopted to check the consistency of raingauge records.

True

False

Answer Key: True

Part 3 of 3 - 0.0/ 1.0 Points

Question 31 of 31 0.0/ 1.0 Points

Answer any FIVE of the following questions 1. What is W index? What are its uses?. 2. Consider the

statement: The 50 year 24 hour maximum rainfall at Bangalore is 160 mm. What do you understand by

this statement? 3. Discuss any two factors affecting soil erosion. 4. Define direct runoff and base flow. 5.

Define unit hydrograph and mention its components. 6.Write the equation for USLE? Explain the terms.