Irrigation and Drainage Civil engineering 4. An irrigation project is planned in an arid zone. The maximum

Irrigation and Drainage
Civil engineering

  

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4. An irrigation project is planned in an arid zone. The maximum water requirements of crops are estimated in August during which no precipitation is observed. The mean river discharge is 15 m/s. Of this amount, Qr discharge is diverted to irrigate the project area as shown in Figure 1. The areal distribution of crops k values to be used in the Blaney-Criddle equation are given below for August with t-30°C. Take overall eficiency E-60%. The area is located on 38° latitudes in northern hemisphere. a) Determine the design irrigation discharge of the project area (Qir) b) Determine the section dimensions of the trapezoidal main canal at point A with Som 0.0008, z=1.5, n= 0.016 and b = 1.8 m. Consider umin= 0.5 m/s. Q-15 m/s IRRIGATION AREA 4000 ha Figure 1. Definition sketch for problem 4. 4. An irrigation project is planned in an arid zone. The maximum water requirements of crops are estimated in August during which no precipitation is observed. The mean river discharge is 15 m/s. Of this amount, Qr discharge is diverted to irrigate the project area as shown in Figure 1. The areal distribution of crops k values to be used in the Blaney-Criddle equation are given below for August with t-30°C. Take overall eficiency E-60%. The area is located on 38° latitudes in northern hemisphere. a) Determine the design irrigation discharge of the project area (Qir) b) Determine the section dimensions of the trapezoidal main canal at point A with Som 0.0008, z=1.5, n= 0.016 and b = 1.8 m. Consider umin= 0.5 m/s. Q-15 m/s IRRIGATION AREA 4000 ha Figure 1. Definition sketch for problem 4.

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