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National Champion Test: Hydrology & Irrigation
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Question 1
Following data are given:
1. Available moisture holding capacity of soil=12.5cm/m depth of soil
2. Root zone depth of crop=0.8m
3. Consumptive use=5mm/day
If moisture depletion is allowed to 50% of available moisture then the frequency of irrigation will be ___days.
1. Available moisture holding capacity of soil=12.5cm/m depth of soil
2. Root zone depth of crop=0.8m
3. Consumptive use=5mm/day
If moisture depletion is allowed to 50% of available moisture then the frequency of irrigation will be ___days.
Question 2
If a bridge is designed for a 50 year flood, then the probability that only one flood of the design capacity or higher will occur in the 75 years life of the bridge is …………..
Question 3
To obtain the lake evaporation in cm, the evaporation observed from an ISI pan under similar climatic and exposure condition is found to be 12.60 cm. The lake evaporation will be in the range of
Question 4
A reservoir has a catchment area is about 150 hectares. The rainfall is 2.5times of run-off and the catmint gets 10 cm rainfall, a stream flow at the catchment outlet lasts for 10 hours, what is average stream flow in the period?
Question 5
Wheat crop requires 55 cm of water during 120 days of base period. The total rainfall during this period is 100 mm. Assume the irrigation efficiency to be 60%. The area (in ha) of the land which can be irrigated with a canal flow of 0.01 m3/s is
Question 6
The culturable command area for a distributary channel is 20,000 hectares. Wheat grown in the entire area and the intensity of irrigation is 50%. The kor period for wheat is 30 days and the kor water depth is 120mm. The outlet discharge for the distributary should be
Question 7
The culturable commanded area for a distributary is 2 x 108 m2. The intensity of irrigation for a crop is 40%. If k or water depth and k or period for the crop are 14cm and 4 weeks, respectively, the peak demand discharge is
Question 8
A triangular irrigation canal carries a discharge of 25m3/s at bed slope = 1/6000. If the side slopes of the canal are 1:1 and Manning's coefficient is 0.018, the central depth of flow is equal to
Question 9
A four hour unit hydrograph of a catchment is triangular in shape with base of 80 hours. The area of the catchment is 720km2. The base flow and f-index are 30m3/s and lmm/h, respectively. A storm of 4cm occurs uniformly in 4 hours over the catchment.
The peak flood discharge due to the storm is
Question 10
For a catchment, the S-curve (or S-hydrograph) due to a rainfall of intensity 1 cm/hr is given by
Q = 1–(1 + t) exp (-t) (t in hr and Q in m3/s).
Q = 1–(1 + t) exp (-t) (t in hr and Q in m3/s).
What is the area of the catchment ?
Question 11
For a catchment, the S-curve (or S-hydrograph) due to a rainfall of intensity 1 cm/hr is given by
Q = 1–(1 + t) exp (-t) (t in hr and Q in m3/s).
Q = 1–(1 + t) exp (-t) (t in hr and Q in m3/s).
What will be the ordinate of a 2-hour unit hydrograph for this catchment at t = 3 hour?
Question 12
The storage time constant of the flood hydrograph is 24h with the weighing factor 0.20. Find the outflow discharge on 24h and the rate of outflow is 10 cumec at time t = 0.
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May 12ESE & GATE CE
