WorksheetsIrrigation problem based on water requirement
Total questions: 12
Worksheet time: 2hrs 32mins
10 m^3/s of water is diverted to a 32 hectare field for 4 hours. Soil probing after irrigation showed that 0.3 m of water had been stored in the root zone. Water application efficiency in this case would be
33.37%
100%
66.67%
50%
A canal was designed to supply irrigation needs of 1000 hectare of land drawing rice of 140 days base period and having a delta of 130 cm. If canal water is used to irrigate wheat of base period 119 days and having a delta of 50cm, the area that can be irrigated is
1200 ha
2210 ha
3220 ha
2500 ha
What is the moisture depth available for evapotranspiration in root zone of 1m depth soil, if dry weight of soil is 1.5 g/cc, field capacity is 30% and permanent wilting point is 10%?
300 mm
150 mm
250 mm
30mm
If discharge required for different crops is 0.4 cumec in the field and capacity factor and time factors are 0.8 and 0.5 respectively, then what is the design discharge of distributary at its head?
0.5 cumec
1 cumec
0.8 cumec
0.1 cumec
In a canal irrigation project, 76% of CCA remained without water during Kharif season and 58% of CCA remained without water during rabi season in a particular year. Rest of the areas got irrigated in each crop respectively. What is the intensity of irrigation for project in the year?
22 %
42%
66%
134%
An identified source of irrigation water has iron concentration of Na+, Ca2+ & Mg2+ as 20, 10 and 8 milliequivalent per litre respectively. The SAR of this water is approximately
2.5
6.67
10.8
5.3
The optimum kor water depth for Kharif crop is 19cm with an allowed kor water period of 3 weeks, the outlet discharge factor for this crop will be
955 ha/cumec
1050 ha/cumec
860 ha/cumec
665 ha/cumec
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 a field capacity of 30%, permanent wilting=15% and density of soil= 1.5g/cc ?
The consumptive use for crop is 5mm/day and only 60% of available moisture is permitted to be availed.
16 days
10 days
21 days
30 days
The following data were noted from an irrigation field:
1. Field capacity=20%
2. Permanent wilting point=10%
3. Permissible depletion of available soil moisture=50%
4. Dry unit weight of soil=15kN/m^3
5. Effective rainfall=50mm
The net irrigation requirement per metre depth of soil will be
75mm
50mm
25mm
125mm
Which among the following statements are true?
Soil moisture tension is the pressure which must be exerted on the soil in order to extract water from it.
At field capacity moisture tension is about 1/10 to 1/3 atm.
At permanent wilting point moisture tension is 7 to 32 atm.
Soil moisture tension is also known as capillary potential.
Soil moisture tension is a measure of tenacity with which the water is held by the soil.
The moisture tension for a soil is 8 atmospheres. The soil is then at
Permanent wilting point
Field capacity
Optimum moisture content
Equivalent moisture
A soil sample has an exchangeable sodium percentage of 16%, its electrical conductivity is is 3.2 milli-Mhos/cm and pH of 9.5. How is the soil classified?
Saline soil
Saline alkaline soil
Alkaline soil
None of the above
