Answer:
Given, diameter of cylinder \[(d)=2\text{ }m\] Radius of cylinder \[r=1\text{ }m\] Height of cylinder \[({{h}_{1}}\text{)=}\,5\text{ }m\]. Length of park \[l=25\text{ }m\] Breadth of park \[(b)=20\text{ }m\] Let height of standing water in the park \[=h\] Volume of water used to irrigate the park = Volume stored in cylindrical tank \[l\times b\times h=\pi {{r}^{2}}{{h}_{1}}\] \[25\times 20\times h=\frac{22}{7}\times 1\times 1\times 5\] \[h=\frac{22\times 5}{7\times 25\times 20}=\frac{3.14}{100}=0.0314\,\,m\] \[=3.14\,\,cm\] Recycling of water is very important as it saves wastage of fresh water for work like irrigation. Recycled water can be used for cleaning vehicles etc. also.
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