Ex 4-4: Using Blaney-Criddle formula, calculate the irrigation interval through specific interval of plant growth according to the following data: • Mean air temperature 25 Co • • Crop coefficient 0.75 • percentage of day light hour through the month 8.4% . Effective root depth 85 cm Apparent specific gravity of soil 1.4 Field capacity as equivalent water depth 20 cm • Wilting point as percentage by weight 12% Re-solve the problem by using Kharrufa formula to estimate the consumptive use.

Ex 4-4: Using Blaney-Criddle formula, calculate the irrigation interval through specific interval of plant growth according to the following data: • Mean air temperature 25 Co • • Crop coefficient 0.75 • percentage of day light hour through the month 8.4% . Effective root depth 85 cm Apparent specific gravity of soil 1.4 Field capacity as equivalent water depth 20 cm • Wilting point as percentage by weight 12% Re-solve the problem by using Kharrufa formula to estimate the consumptive use.

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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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.
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Assume any other data,not given
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.
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.
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%
Q1/By Using modified Blaney- Criddle method (prof. Najeeb kharrufa) for rice crop has growing in a farm at the climate condition are tabulated below the season consumptive use (Cu) is : Month April May June T(C ) 28 30 35 P % 9.5 9.7 9.7 A- 31.54 cm B- 96.85 cm c- 25.88 cm C- 98.45 cm
Q4) Given; fc = 20%, wp = 1O %, PAD%=50, As=1.5, and effective rainfall= 50mm. The net irrigation requirement per meter depth of soil .will be 125 mm O 50 mm O 25 mm O 75 mm O
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.
Q1 During a particular stage of the growth of a crop, consumptive use of water is 3.2 mm/day, and the PWP is 13.6 mm in terms of depth and 17% as a percentage. Find the irrigation frequency and depth of water to be applied, when the amount of water available in the soil is: (i) 10%, (ii) 20% (iii) 45 %, (iv) 80% and (v) 0% of the maximum depth of available water in the root zone. Assume irrigation efficiency to be 75%.
After how many days will you order irrigation in order to ensure healthy growth of crops, if the field capacity of soil is 29%, PWP is 11%, Density of soil is 1300 kg/m³, Effective RZ is 700 mm, daily Cu is 12 mm. For healthy growth, moisture content must not fall below 25% of the water holding capacity of soil.
Irrigation system, civil problem be accurate.