(Q2]// [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.

(Q2]// [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.

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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IQ2]// [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.
Q2-1/ An agricultural farm is cultivated by crops. Available data are: dR = 1.8 (m), A = 50 (Hectare), (wv)p=15% and (wy)F = 32%. Compute volume of irrigation water required to be added to the farm in order to raise water content in porous soil of R. Z. from (wy)p% to (wy)F%. Note/ (Wy)add (Wy)F - (Wv)p ANSWER/ = (Wy)add = (Wy)F - (Wv)p = 17% (Wv)add = {(Vw)add/(Vt} x 100 (Vw)add = 153000 (m³ of irrigation water) required to be add.
Q#2 The moisture holding capacity of the soil in a 100-hectare farm is 18 cm/m, the field is to be irrigated when 50% of t'ne available moisture in the root zone is depleted. The irrigation water is to be supplied by a pump working for 10 hours a day, and water application efficiency is 75%. Details of crops planned for cultivation area are as follows: Root z'one depth (m) Peak rate of moisture use (mm/day) 5 4 Crop X Y Solve for 1) The capacity of irrigation system required, to irrigate crop X in 36 hectares. 2) The area of crop Y that can be irrigated when the available capacity of irrigation is 40 L/s. 1 0.8
Given the following soil and crop data are provided:• Area to be irrigated = 50000 m2• Soil: medium texture, loam• Crop: Millet with peak daily water use = 6.2mm/day• Soil moisture at field capacity = 30 cm/m• Soil moisture at the permanent wilting point = 15 cm/m• Allowable portion of available moisture permitted for depletion by thecrop before the next irrigation = 50%• RZD = 80 cm• Soil infiltration rate = 5.6 mm/hr• Irrigation efficiency = 75%• Operation time per day: 2 shifts per day operating at 600 minutes pershiftDetermine:Available moisture.Net depth of water application per irrigation.Irrigation frequency. Gross depth of water application.System capacity.
The soil moisture at field capacity is 40% (volume basis) and at wilting point it is 16%. Allow ¼ of the total available moisture to be retained in the soil before applying irrigation water. For a 1-m soil depth to be wetted, compute the: A. amount of water to be applied (in cm) if water application efficiency is 80%, B. stream flow required in lps to irrigate 10 hectares in 12 hours, C. number of days for the crop to consume the available moisture before you apply another round of irrigation if rate of water consumption is 8 mm/day.
The moisture content of a soil is to be increased up to the field capacity of 28% from 21% through irrigation of the field. Determine the depth of water to be irrigated (in mm) if the effective root zone is at a depth of 70 cm. Take density of soil as 1.3 g/cm3 and that of water as 1.0 g/cm3.
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.
Q6//The farm shown in the figure is irrigated by furrow system: • FC=32% by vol. ,W P = 18% by vol. . PAD= 70% • Depth of root zone-100 cm • • • • Spacing between furrows = 80 cm The field is irrigated 2 days in week Total available discharge Qa= 60 Lps Discharge of one furrow.q=1.0 Lps Neglect any service area, calculate: a) length of one furrow and their total number b) number of furrows irrigated at the same time and number of irrigation groups c) application time of any group d) net irrigation depth el application efficiency 0.1% 288m ↑ 200m + 0.5%
Following data were noted from an irrigation field: 1. Field capacity = 30% 2. Permanent wilting point = 10% 3. Permissible depletion of available soil moisture = 50% 4. Dry unit weight of soil = 1800 kg/m3 5. Effective rainfall = 55 mm Based on the above data, the net irrigation requirement per meter depth of soil will be
Estimate the depth and frequency of irrigation required For a certain crop, given: Assume 50% depletion of available moisture as the indicator to began application of irrigation water. Root zone depth : 90 cm Field capacity : 22% Wilting point : 12% Apparent sp. gr. of soil: 1.5 Consumptive use : 22 mm/day Efficiency of irrigation : 60%
Determine the soil loss for a field at your present location if K = 015, l = 91 m, s = 10 percent, C = 0.20 and upslope and downslope farming is practiced. What conservation practice should be adopted if the soil loss is reduced to 7 Mg/ha. Show complete solution.
Q2-2/ An agricultural farm is cultivated by crops. Available data are: dr = 1.2 (m), A = 50 (Hectare), G = 1.25, Gs=2.7 and (wy) = 21.48 %. Compute values of the followings: (wy)s% and (dw)F. (Vw)s (m³ of water stored in the soil of R.Z. at its saturated condition). ANSWER/ (Wv)s = 53.7%, (Wv)d=21.48%, (Vw)s = 322200 (m³ of water stored in the soil of R.Z. at its saturation condition). (dw)F= 0.387 (m of water depth/each irrigation process)