What functions do catchment areas and wetlands have in getting water to our villages, towns and cities? mention three.

Catchment areas are essential for bring water to our villages, towns, and cities because they help to collect and push water resources into a centralized location for humans to use. These areas are essential to supporting life as well because catchments help to refill groundwater resources that are used in many processes of human life. In addition wetlands help to process water that is polluted making it safer for human use and also better for the environment to prevent damage. 

1296 of water

Explanation:

Area of landfill is 6000

Rain fall depth is 300 mm = 300 x m

volume of water that fall on the landfill is area x depth of water

v = 6000 x 300 x = 1800 of water

20% of this precipitate is runoff i.e 0.2 x 1800 = 360

total volume that infiltrates is 1800 - 360 = 1440

the leachate treatment is 90% effective in treating infiltrates, i.e 90% of 1440 = 0.9 x 1440 = 1296 of water water is treated yearly