Determine the Gross irrigation requirement for an irrigation system if consumptive use of crop is 200 cm in terms of depth and the rainfall excess is 30 cm. assume water application efficiency = 50% and conveyance efficiency = 90%.

← Prev Question Next Question →

1 Answer

Related questions

+1 vote

1 answer

A pump was installed in a field to supply water to the crops. The duty for this crop is 432 hectares/cumec on the field and the efficiency of pump is 50%. The sown area of the field is 5 hectares. Determine the maximum output required (H.P) of the pump, if the highest water level is 4 meters below the highest portion of the field. Assume negligible field channel losses.

asked Aug 16, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

The moisture holding capacity of the soil in a 100-hectare farm is 20 cm/m. The root zone depth of the crop is 1.0 m and peak rate to moisture use is 5 mm/day. The field is to be irrigated when 40% of the available moisture in the root zone is depleted. Calculate the frequency of irrigation.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

What is the consumptive use for a crop in the month of April having a consumptive use coefficient equal to 0.80 and pan evaporation is 35 cm?

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Compute the total consumptive use for a drainage basin by Penman’s formula. The slope of saturation vapour pressure V/s chart at 40°C is 2.95 mm of Hg/°C and the net incoming solar radiation is 5.705 mm of evaporative water/day. Assume, Ea = 18.07 mm/day and Psychrometric constant = 0.49 mm of Hg/°C.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Furrows of 150 m long and 2 m apart, have longitudinal slope of 0.5 percent are initially irrigated by non-erosive stream for 100 minutes. The stream size is reduced to 50% and continued for another 40 minutes. Determine the average depth of irrigation.

asked Aug 16, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Given that a particular crop requires about 20 cm depth of water at an interval of 40 days, and the base period is 400 days. Find the delta for the crop? Now using this delta find the duty of water for the crop?

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

The mean depth of water is 1.5 cm and the mean deviation from the mean is 0.1 cm. Determine its distribution efficiency.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Determine the distribution efficiency, if the depths of water in the field are 1.1 cm and 1.8 cm.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Determine the discharge required at the head of the distributary in a canal where Kharif area to be irrigated is 2400 hectares and Rabi area to be irrigated is 1800 hectares, for fulfilling maximum crop requirement. Assume suitable values for kor depth and kor period.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

The value of consumptive use may be different for different crops and different for the same crop at different times and places.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

What is the correct formula for Gross irrigation requirement?

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

At a certain place, the transplantation of a crop takes 15 days, and the total depth of water required by the crop is 90 cm on the field. During the plantation rain falls and about 20 cm is utilised to fulfil the demand. Now determine the duty of irrigation water required during the plantation.

asked Aug 15, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

The quantity of water that is pumped into a farm distribution system is 2 cumec. 1.6 cumec is delivered to a turn-out, 1km from the well. Compute the conveyance efficiency.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

It is said that a particular type of crop requires a depth of 6 cm of water every 24 days and the crop period is 168 days. Find the delta of the crop?

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

The Gross Command Area for a distributary is 8000 hectares 80% of which is culturable irrigable. The intensity of irrigation for Rabi season is 50% and the average duty at the head of the distributary is 2000 hectares/cumec. Determine the discharge required at the head of the distributary.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

The transplantation of rice takes 18 days and the total depth of water required by the crop is 60 cm on the field. During this transplantation period, rain starts falling and about 10 cm of rain is being utilized to fulfill the rice demand. Find the duty of irrigation water required for rice assuming 25% losses of water in watercourses.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Let us consider in a given area the plantation of a certain crop takes 20 days, and the total water depth required by this crop is 80 cm on the field. Find the duty of irrigation water required for the crop during this period. (a) Assuming 20% losses of water in the water courses, find duty at the head of the course. (b) Find the duty of the water at the head of the distributary, assuming 10% losses from the distributary head.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Which of the following statement is wrong about consumptive use efficiency?

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Determine the volume of water stored in unit area if unit weight of water is 9.8 KN/m^3, dry unit of soil is 17 KN/m^3, field capacity (F) is 2.35 m^2, and depth of root zone of the plant is 9 m.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Estimate the leaching requirement when electrical conductivity (EC) value of a saturated extract of soil is 10 m mho/cm at 25% reduction in the yield of the crop. The EC of irrigation water is 1.5 m mho/cm.

asked Aug 25, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

What is water conveyance efficiency?

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

The monthly consumptive use values for paddy are 26.69, 8.76, 14.38, 22.73, 21.29, 25.50 and 15.06 for the duration of month from June to July. What is the average daily consumptive use?

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

Which of the following is not an empirical method of determining consumptive use?

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

+1 vote

1 answer

What is total depth of water, for complete growth of crop called?

asked Aug 15, 2023 in Irrigation Engineering by Carter (75.2k points)

0 votes

0 answers

Which method is widely used in India for the computation of consumptive use?

asked Mar 16 in Irrigation Engineering by Carter (75.2k points)

...