How to Determine the Frequency of Irrigation Mathematical Problem Following data are given, determine the frequency of irrigation Field capacity of soil = 45 % Permanent wilting point = 19 % Density of soil = 1.5 g/cm3 Depth of root zone = 65 cm Daily consumptive use of water = 18 mm Solution: Available moisture…
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Find the intensity of Rainfall When the duration of Rainfall is Given First of all, we need to know the formula used to determine rainfall intensity. There are three types of empirical formula, they are a) For storm duration 5 to 20 minutes b) For storm duration 20 to 100 minutes c) Where rainfall is…
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How to Determine Runoff by using Rational Method First of all, we need to understand which formula or expression are used for determination of runoff. In rational method, the runoff is given by the following expression: Where, Q = Runoff in cumecK = Coefficient of runoffi = Intensity of rainfall in cm/hrA = Catchment area…
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How to Determine Runoff Coefficient When the nature of the surface of different areas and the impermeability factors of the areas are known or given, then the value of runoff coefficient(K) may be determined by the following expression: Where, a1, a2 = Area of different surfaces.p1, p2 = Impermeability factors of those surfaces.A = Total surface area….
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Find the Correction for Curvature Mathematic Problem Find the correction for curvature for a distance 900 m and 2.5 km. Solution 1. When the distance is 900 m 0r 0.9 km Correction for curvature (in meters) = 0.0785 D2 After Putting the value of D in the above equation [D is in Km] Correction for…
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Calculate the Horizontal Length After Slope Correction of Tape Mathematical Problem: The downhill end of the 30 m tape is held 70 cm too low. What is the horizontal length? Solution: Given, l = Length of the tape = 30 m.h = 70 cm = 0.70 m Correction for slope = = = 0.00817 m….
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Find out the Discharge of a Siphon Spillway Mathematical Problem: Find out the discharge of a siphon spillway from following data: Number of siphon units = 4 Area at throat in m2 = 3 Full reservoir level = 150 m R.L of centre of outlet = 128 Tailwater level on D/S side during rains =…
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