water in a canal, 3m wide and 1.5m deep is flowing with a speed of 5km/hrs. how much area will it irrigate in 30 minutes. if 4cm of standing water is needed
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volume of water flowing through the canal per hour = l×b×speed
= 3×1.5×5000 = 22500 m^3 per hour
converting into volume of water per minute
= 22500/60 = 375 m^3 per min.
volume of water delivered to the field in 30mins
= 375×30 = 11250 m^3 per min.
now the volume of the field = area × height
as the volume of field is equal to volume of water delivered in 30 mins , we get
11250 = a × 0.04
a = 281250 m^2
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