Irrigation & Drainage important questionsMost repeated in SPPU papers
These 40 questions appeared in more than one SPPU Irrigation & Drainage paper we have: 9 papers, from Feb 2023 to Nov 2025. The most-asked come first. Each one links to the papers it was asked in.
Repeated questions
Endsem questions (33)
- 6×asked
- 6×asked
It is required to design surface drainage for a new agricultural farm to drain out irrigation tail-water and seasonal rainfall runoff. The maximum rainfall intensity at the site in 30 years record is 38 mm/h. The tertiary drain would have to carry runoff from 6.0 ha land. The secondary drain would have to carry thrice of tertiary, and the main drain to carry discharge of five secondary drains (of similar flow). Determine the design discharge capacity of the (i) tertiary, (ii) secondary, and (iii) main drain.
- 5×asked
Determine the system capacity for a sprinkler irrigation system to irrigate 25 hectares of a crop. Design moisture use rate is 7.5 mm/day. Moisture replaced in soil at each irrigation is 8 cm. Irrigation efficiency is 75 %. Irrigation period is 11 days in a 14-day interval. The system is to be operated for 19 hours per day.
- 5×asked
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- 3×asked
A sprinkler irrigation system is to be designed to irrigate 8 hectares of vegetables crops in deep silt loam soil in moderate dry climate. The field is flat. Determine the irrigation period, the net depth of water per application, the depth of water pumped per application and the required system capacity in hectare-cm per day. Assuming that the system is operated for 15 hours each day, determine the pump capacity in lit/sec. Assume following data: Limiting application rate = 1.3 cm/hr Moisture holding capacity of the soil = 9.5 cm/meter depth Root zone depth = 60 cm Irrigation to be stated at 50 % moisture depletion.
- 3×asked
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- 2×asked
- 2×asked
Determine the depth of irrigation water which would change 25 cm depth of loam soil into saline soil condition, if the electrical conductivity of irrigation water is 1.5 millimhos/cm. The bulk density of the soil is 1.21 gm/cc and the density of water is 1gm/cc. The saturation percentage of the soil is 40. 3
- 2×asked
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Insem questions (7)
- 3×asked
Estimate the potential evapotranspiration (PET) of an area for the month October and November in which sugarcane is grown. The latitude of the area is 18ºN. The average value of crop coefficient K = 0.95 in Blaney- Criddle formula. The mean monthly temperature for the month October and November is 75ºF (=23.89ºC) and 72ºF (=22.22ºC). Use Table (3a) to calculate monthly daytime hours percentage. Table 3a: Monthly daytime hours percentages, Ph, for use in Blaney- Criddle formula North latitude (deg) Oct. Nov. 0 8.50 8.22 10 8.34 7.91 15 8.26 7.75 20 8.18 7.58 2
- 2×asked
A crop has effective root zone depth of 1200 mm and monthly (30 days) crop evapotranspiration of 260 mm. The effective rainfall during the 30 days period is 20mm. The field capacity and permissible soil moisture depletion (volume basis) are 16% and 8% respectively. Determine the irrigation interval in days for the crop.
- 2×asked
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- 2×asked
Questions count as repeated when their wording matches closely across papers. Numericals that depend on a figure are left out, since the figure changes from paper to paper.