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(Sustainable Urban Drainage System).
Improve water quality and slow down water, thus reducing flood risk.

--> Encourage water to pass into the ground and aquifer.
-->  Slow the velocity of runoff into soak-away or infiltration trenches.
--> Provides protection from polluted water and can create green spaces.

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- This human activity has the largest impact on the hydrological cycle.
- As population rises and there is a change to a meat-based diet, more water is required for the production and distribution of food.
- Poor drainage alongside excessive irrigation increases soil salinity levels.
---> Soil becomes sterile
- Water runs through agriculture land and accumulates pesticides.
---> Aquatic ecosystems and organisms are harmed.
---> Eutrophication is caused by fertilizers.
---> "Blue baby syndrome" (methaemoglobinaemia) is caused by an increased level of nitrates.
-Water comes into contact with animal waste.
---> There are pathogens and disease in animal waste.
---> Photosynthesis cannot happen as well, because light penetration to plants is reduced.

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4.1.3.7 Potential impacts of use of water in agriculture.0f6e7a7cbc493b6ce7f2

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Reduce the amount of fertilizer used in crops.

Reuse animal waste is a sustainable way - preventing pollution run-off.

Limit the amount of pesticides used to control pests, and instead use integrated pest control (IPM) which is far more natural against pests.

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The movement of people from rural areas to town and cities.

--> Implementation of concrete and tarmac prevents water from passing through.
--> Run-off is often diverted into drainage systems which discharge into nearby rivers and streams.
--> Increased volume of water entering surface waters can increase the risk of flooding.
--> Aquatic habitats can also become degraded by the polluted run-off.

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Forest deforestation affects the hydrological cycle by:
- Trees intercept rainfall. When deforestation occurs, there is more soil erosion.
- Trees impede the movement of water which allows for infiltration
- Trees absorb water through the root system.

The forest absorbes water and reduces run-off.

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- Replanting forest vegetation can protect soil and reduce soil erosion because it intercepts rainfall
---> less erosion = less sediment = less water pollution

- Slows the movement of water
---> Allows time for infiltration

- Plant roots absorb run-off
---> reduced water flow and risk of floods

- Reforestation increases air moisture
---> prevents droughts