Civil Engineering - Water Resource Engineering

Question - 1

What is the moisture depth available for evapotranspiration in root zone of 1 m depth soil, if they dry weight of soil is 1.5 g/cc, field capacity is 30% and permanent wilting point is 10%?

  • A 450 mm
  • B 300 mm
  • C 200 mm
  • D 150 mm

Question - 2

A agricultural land of 437 ha is to irrigated for a particular crop. The base period of the crop is 90 days and the total depth of water required by the crop is 105 cm, if rainfall of 15 cm occurs during the base period, the duty of irrigation water is

  • A 437 ha/cumec
  • B 486 ha/cumec
  • C 741 ha/cumec
  • D 864 ha/cumec

Question - 3

An outlet irrigates an area of 20 ha. The discharge (litre/s) required at outlet to meet the evapotranspiration requirement of 20 mm occurring uniformly in 20 days neglecting the other field losses is

  • A 2.52
  • B 2.31
  • C 2.01
  • D 1.52

Question - 4

The plan area of a reservoir is 1 km2. They water level in the reservoir is observed to decline by 20 cm in a certain period, the reservoir receives a surface inflow of 10 ha-m and 20 ha-m are abstracted from the reservoir for irrigation and power. The pan evaporation and rainfall recorded during the same period at a nearby metrological station are 12 cm and 3 cm respectively. The calibrated pan factor is 0.7. The seepage loss from the reservoir during this period in hectare-m is

  • A 0.0
  • B 1.0
  • C 2.4
  • D 4.6

Question - 5

The time required to irrigate a strip of area 0.203 ha by a stream discharge of 0.043 cumec to provide an average depth of 6.35 cm the field is (rate of infiltration=5 cm/h)

  • A 2.75 h
  • B 3.10 h
  • C 3.39 h
  • D 1.35 h

Question - 6

With the increase in supplied irrigation water, the yield of crops

  • A increase continuously
  • B decrease continuously
  • C Increase upto a certain limit and then becomes constant
  • D Increase upto a certain limit and then decrease

Question - 7

A soil has a field capacity of 25%, permanent wilting point of 15% and specific weight of 14.7 kN/m3. If the root zone depth of the grown crop is 90 cm, then its available moisture holding capacity is

  • A 10 cm
  • B 13.5 cm
  • C 16.67 cm
  • D 20 cm

Question - 8

After how many days will you recommend supplying irrigation water to a crop having 0.8m root zone depth and grown in a soil having field capacity of 30%, permanent wilting=15% and density of soil=1.5 g/cc? The consumptive use for the crop is 5 mm/day and only 60% of available moisture is permitted to be availed.

  • A 9 days
  • B 15 days
  • C 21 days
  • D 40 days

Question - 9

If in a certain irrigation project and in a given year 72% and 56% of the culturable command remain unirrigated in Kharif and Rabi seasons respectively, then the intensity of irrigation for that year and for that project would be

  • A 36%
  • B 64%
  • C 72%
  • D 128%

Question - 10

A canal was designed to supply the irrigation needs of 1000 ha of land growing rice of 140 days base period and having a delta of 130 cm. If the canal water is used to irrigate wheat of base period 119 days and having a delta of 50 cm. The area that can be irrigated is

  • A 452 ha
  • B 904 ha
  • C 1105 ha
  • D 2210 ha
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