[[Image:intake icon.png|right|80px]][[Image:AriverIntake.png|thumb|right|300px200px|A river intake on the Sankhulani scheme, shown with Mr. Alizeo (repair team member) and Mr. Utumbe (government water supervisor). Photo: [http://thoughtsfrommalawi.blogspot.com/2009/08/how-it-works.html Thoughts from Malawi blog.]]]__NOTOC__<small-title />
A protected side intake provides a stable place in the bank of a river or lake, from where water can flow into a channel or enter the suction pipe of a pump. It is built to withstand damage by floods and to minimize problems caused by sediment. Side intakes are sturdy structures, usually made of reinforced concrete, and may have valves or sluices to flush any sediment that might settle. Often, a protected side intake is combined with a weir in the river to keep the water at the required level, a sand trap to let the sand settle, and a spillway to release excess water. The river water may enter the side intake through a screen, and a spillway overflow may be provided. Sometimes, protected side intakes are combined with a dam and a flushing sluice, which allows the upstream part of the river to be flushed.
===Suitable conditions===
* The main purpose of an intake is to ensure a constant water supply that can be adjusted to suit local conditions.
* Avoid large rivers with a fluctuating water level. Be very careful to make sure the intake is not set above the minimum water level of the river.
===Resilience to changes in the environment===
====Drought effects on cement====
'''Effects of drought''': When water levels are low, problems can occur if the concrete was badly made, which also leads to cracked linings (e.g. in tanks, dams, waterways, wells, and other structures).
More information on managing drought: [[Resilient WASH systems in drought-prone areas]].
===Construction, operations and maintenance===[[Image:protectedSideIntake.jpg|thumb|right|300px200px|Protected side intake diagram. Click to zoom. <br> Drawing: WHO.]]
— Operation of a protected side-intake system is usually carried out by a caretaker; <br>
— a valve or a sluice may have to be adjusted daily, the inlet to the channel or pump checked for obstructing debris, and any damage repaired; <br>
— the river or lake water may be polluted.
===Costs===
==Manuals, videos, and links==
[ftp://ftp.fao.org/fi/CDrom/FAO_Training/FAO_Training/General/x6708e/x6708e07.htm Main water intake structures.] FAO.
===Acknowledgements===
* Brikke, François, and Bredero, Maarten. [http://www.washdoc.info/docsearch/title/117705 Linking technology choice with operation and maintenance in the context of community water supply and sanitation: A reference document for planners and project staff] or ([http://www.who.int/water_sanitation_health/hygiene/om/wsh9241562153/en/ alternative link]). World Health Organization and IRC Water and Sanitation Centre. Geneva, Switzerland 2003.
* CARE Nederland, Desk Study: [[Resilient WASH systems in drought-prone areas]]. October 2010.