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{{Language-box|english_link=Ground Catchment | french_link=Le captage de surface |spanish_link=Coming soon|hindi_link=Coming soon|malayalam_link=Coming soon|tamil_link=Coming soon | korean_link=Coming soon | chinese_link=地表集水区 | indonesian_link=Coming soon | japanese_link=Coming soon }}
Open reservoirs can be used to capture rainwater runoff for agriculture or domestic use and for recharging an aquifer. Oftentimes these natural reservoirs are the cheapest option for water storage. However, modifications can be made to increase volumes or gain access to the water. Small dams can be built or linings (to prevent infiltration) can be added. Diversions can also be created to send water to crops or nearby villages. For additional expense, [[underground tank]]s can be built in a runoff basin, which can be made with an increased depth to width ratio (more deep than wide), which means less evaporation losses overall.
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|style="background:#efefef;"|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Natural_rock_catchment_and_Open_water_reservoir|Natural rock <br>catchment and <br>Open water reservoir]]</div>
* [http://smallreservoirs.org/ Small Reservoirs Project.] Small Reservoirs Project: Planning and evaluating ensembles of small, multipurpose reservoirs for the improvement of smallholder livelihoods and food security.
* [httphttps://wwwsswm.hpscste.gov.ininfo/sites/default/files/rwhreference_attachments/Blue_Drop_Series_02_UN-_Capacity_BuildingHABITAT%202005%20Rainwater%20Harvesting%20and%20Utilisation%20Book%202.pdf Rainwater Harvesting and Utilisation, Blue Drop Series: Book 2: Beneficiaries & Capacity Builders] or ([http://www.washdoc.info/docsearch/title/154206 alternative link)]. UN-HABITAT.
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===Acknowledgements===
* [httphttps://docswww.watsangwp.netorg/Downloaded_Filesglobalassets/PDFglobal/IWMItoolbox/references/flexible-water-storage-options-and-adaptation-to-climate-change-iwmi-2009-Flexible.pdf Flexible water storage options and adaptation to climate change] or ([http://www.iwmi.cgiar.org/Publications/Water_Policy_Briefs/PDF/WPB31.pdf alternative link)]. International Water Management Institute (IWMI). Issue 31, 2009.
* CARE Nederland, Desk Study: [[Resilient WASH systems in drought-prone areas]]. October 2010.
