Mumbai needs 1.4 times 10^{12} L of water ann | vedclass

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Question

(b) Surface area over which rain is received, $A=600 \,km ^2$

$=600 	imes\left(10^3ight)^2 \,m ^2$

$=6 	imes 10^8 \,m ^2$

Average rainfal

Vedclass · Accepted Answer

$10 \%$ of Mumbai's water needs

Vedclass · Answer

(b) Surface area over which rain is received, $A=600 \,km ^2$

$=600 	imes\left(10^3ight)^2 \,m ^2$

$=6 	imes 10^8 \,m ^2$

Average rainfall, $h=2.4 \,m$

Volume of water received by rain, $V$

$=A 	imes h=6 	imes 10^8 	imes 2.4 \,m ^3$

Water conserved $=10 \%$ of volume received by rain

$=6 	imes 10^8 	imes \frac{10}{100} 	imes 2.4 \,m ^3=1.44 	imes 10^8 \,m ^3$

$=1.4 	imes 10^8 	imes 10^3 L =1.4 	imes 10^{11} L$

Percentage of total water consumption received by rain is

$=\frac{1.4 	imes 10^{11} 	imes 100}{1.4 	imes 10^{12}}=10 \%$

Mumbai needs $1.4 \times 10^{12} L$ of water annually. Its effective surface area is $600 \,km ^2$ and it receives an average rainfall of $2.4 \,m$ annually. If $10 \%$ of this rain water is conserved, it will meet approximately

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