A sandy loam soil holds water at 140 mm/m depth between field capacity and permanent wilting point. The root depth of the crop is 30 cm and the allowable depletion of water is 35%. The daily water use by the crop is 5 mm/day. The area to be irrigated is 60 ha and water can be delivered at 28 litres per second. The surface irrigation application efficiency is 40%. There are no rainfall and ground water contribution. Determine:- (i) allowable depletion depth between irrigations (ii) frequency of irrigation (iii) net application depth of water (iv) volume of water required (v) time to irrigate 4 ha plot

A sandy loam soil holds water at 140 mm/m depth between field capacity and permanent wilting point. The root depth of the crop is 30 cm and the allowable depletion of water is 35%. The daily water use by the crop is 5 mm/day. The area to be irrigated is 60 ha and water can be delivered at 28 litres per second. The surface irrigation application efficiency is 40%. There are no rainfall and ground water contribution. Determine:- (i) allowable depletion depth between irrigations (ii) frequency of irrigation (iii) net application depth of water (iv) volume of water required (v) time to irrigate 4 ha plot

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q1: The water content at the field capacity is 27.2% by weight and it was 19% by weight for irrigation (wilting point), depth of the root zone is 0.92m and the apparent specific gravity is 1.3. Find: 1. The depth of water required to reach moisture in this soil to its field capacity. 2. The time required to irrigate 12 mishara in discharge equal to 75 €/s and 65% the efficiency of irrigation (Ea).
Irrigation water is to be provided to a crop in a field to bring the moisture content of the soil from the existing 18% to the field capacity of the soil at 28%. The effective root zone of the crop is 70 cm. If the densities of the soil and water are 1.3 g/cm³ and 1.0 g/cm³ respectively, the depth of irrigation water (in mm) required for irrigating the crop is C
TQ2]// [A]: Given; the following data for an irrigated field. - Field capacity =20%) by wt. - Wilting point=10%) by wt. - Percentage of allowable depletion of available moisture content =65% - Effective rainfall = 20 mm. - Apparent specific gravity of the soil =1.5. Determine the net irrigation requirement per meter depth of soil. [B]: Prove that: Pw x 100 Pww Pw + 100
What should be the frequency of irrigation?
Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m³ and density of water as 1000 kg/m³. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), is
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