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Water Portal / Rainwater Harvesting / Groundwater recharge / Permeable rock dams

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{{Language-box|english_link= Water Portal / Rainwater Harvesting / Groundwater recharge / Permeable rock dams | french_link= Coming soon | spanish_link= Coming soon | hindi_link= वाटर पोर्टल / वर्षाजल संचयन / भूजल पुनर्भरण / पारगम्य चट्टान बांध | malayalam_link= Coming soon | tamil_link= Coming soon | korean_link= Coming soon | chinese_link=堆石透水坝 | indonesian_link= Bendungan batu permeabel | japanese_link= 水のポータルサイト / 雨水貯留 / 地下水涵養 / 透水性の岩ダム }}

[[Image:perm rock dam icon.png|right|80px]]

[[Image:PermeableRockDam2.JPG|thumb|right|200px|堆石透水坝Permeable rock dam, 流水flowing. Photo: [http://il.water.usgs.gov/asian_carp/images/IM_Canal/3-Illinois%20and%20Michigan%20Canal%20Flow%20Barrier_recent.JPG USGS.]]]__NOTOC__ <small-title />堆石透水坝由低矮的长形石墙构成，有数个高势位置，长度贯穿整个谷底。这样的构造能使水道侧部形成径流。这种洪水灌溉方法能分流并保留洪水，促进庄稼生长，同时控制沟蚀。堆石透水坝可被视作为一种“梯田干谷”，虽然后者通常用于更干旱地区中的水道内的结构。Permeable '''Permeable rock dams ''' consist of long, low rock walls with level crests along the full length across valley floors. This causes runoff to spread laterally from the stream course. This is a floodwater harvesting technique that spreads and retains floodwater runoff for improved crop growth, as well as controls gulley erosion. Permeable rock dams can be considered a form of ‘terraced wadi’, though the latter term is normally used for structures within watercourses in more arid areas.

堆石透水坝Permeable Permeable rock dams provide a more effective and popular technique for controlling gully erosion than gabions. Permeable rock dams, in addition to the effective control of gullies, have resulted in considerable crop yield increases behind the dams. Gullies are rehabilitated by the deposition of silt behind the dams, increasing the depth and quality of the soil immediately behind the dam as a result of the deposition of fertile silt. They have also improved the amount of moisture available for crops. Yields of sorghum from land restored with permeable rock dams range up to 1.9 t/ha compared with a yield of 1 t/ha from equivalent, untreated land. Other crops planted behind permeable rock dams include rice (on heavy soils), pearl millet and peanuts.

===Suitable conditions===

* Rufino, L., [http://www.saiplatform.org/uploads/Library/Technical%20Brief%202%20%20Rainwater%20harvesting%20%20artificial%20recharge%20to%20groundwater.pdf Water Conservation Technical Briefs: TB 2 – Rainwater Harvesting and Artificial Recharge to Groundwater]. Sustainable Agriculture Initiative (SAI). August 2009.

* Awulachew, Seleshi Bekele (IWMI); Lemperiere, Philippe (IWMI). Water harvesting and development for improving productivity. [http://www.ilriiwmi.cgiar.org/InfoServ/Webpub/fulldocs/IWMI_IPMSmodules/Module_2IWMI].pdf Water harvesting and development for improving productivity.] Tulu, Taffa (Adama University). January, 2009.

* [http://www.nzdl.org/gsdlmod?e=d-00000-00---off-0fnl2.2--00-0----0-10-0---0---0direct-10---4-------0-1l--11-en-50---20-about---00-0-1-00-0--4----0-0-11-10-0utfZz-8-00&a=d&cl=CL3.31&d=HASHa7909460293ada0236fd7d.4.2.2.5 Sourcebook of Alternative Technologies for Freshwater Augmentation in Africa (UNEP-IETC, 1998, 182 p.)] or ([http://www.washdoc.info/docsearch/title/115176 alternative link]). UNEP.

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