Question

Water in a canal, 5.4 m wide and 1.8 m deep, is flowing with a speed of 25 km/hour. How much area can it irrigate in 40 minutes, if 10 cm of standing water is required for irrigation?

Answer 1

Hi !

Speed = 25 km/hr = 2500 m/hr
Volume of water flowing out of the canal in 1 hr (60 min)  = 5.4*1.8*2500
                                                                                           = 24300 m³

Volume of water flowing out of the canal in 40 min = 24300*40/60               
                                                                                = 16200 m³

Height of standing water = h = 10 cm = 10/100 m = 0.1 m

Area irrigated in 40 min * h = Volume of water flowing out of the canal in 40 min

Area irrigated in 40 min = volume/height
                                      = 16200/0.1
                                      = 162000 m²
                                      = 16.2 hectares

Area irrigated in 40 min is 16.2 hectares.

Answer 2

Refer the above attachment

Hope it helps

Regards,
Shobana