Outlet discharge from kor table (rice, wheat)

Assumption: kor period is in days and kor depth in cm.

Formula: $Q = \dfrac{A\,d}{T\times 86400}$

Rice: $A = 5000$ ha $= 5\times10^7$ m$^2$, $T = 18$ days, $d = 19$ cm $= 0.19$ m

$$Q_r = \frac{5\times10^7\times0.19}{18\times86400} = 6.109\ \text{m}^3/\text{s}$$

Wheat: $A = 3500$ ha $= 3.5\times10^7$ m$^2$, $T = 26$ days, $d = 15$ cm $= 0.15$ m

$$Q_w = \frac{3.5\times10^7\times0.15}{26\times86400} = 2.337\ \text{m}^3/\text{s}$$

Rice (kharif) and wheat (rabi) are grown in different seasons, so the outlet is designed for the larger value.

Answer: rice needs 6.11 cumec and wheat needs 2.34 cumec; design discharge = 6.11 cumec. (If both were irrigated together, the sum would be 8.45 cumec.)