Izzard formula for the time of concentration in minutes for the plots having no channels, is
(where Lo is the length of overland flow in metres and Kp rainfall intensity in cm/hour)
(A) T = 111 b. L0
1/3/(Kp)2/3
(B) T = 222 b. L0
1/2/(Kp)1/3
(C) T = 333 b. L0/Kp
(D) T = 111 b. L0
1/3/(Kp)2/5
(where Lo is the length of overland flow in metres and Kp rainfall intensity in cm/hour)
(A) T = 111 b. L0
1/3/(Kp)2/3
(B) T = 222 b. L0
1/2/(Kp)1/3
(C) T = 333 b. L0/Kp
(D) T = 111 b. L0
1/3/(Kp)2/5