water in a canal 30dm wide and 12dm deep is flowing with a velocity of 20km/hr. How much area will it irrigate in 30 min if 9cm of standing water is desired ?
width of the canal= 30 dm=300 cm
depth of the canal = 12 dm=120 cm
the velocity of the flow of the water in canal = 20km/hr= 20 × 1000 × 100 cm/hr
amount of water irrigated in 1 hour= 300 × 120 × 2000000
amount of the water irrigated in 30 min =
the area irrigated by this water if 9 cm of standing water is desired,
therefore the area irrigated by this water if 9 cm of standing water is desired,