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Water Portal / Rainwater Harvesting / Groundwater recharge / Contour trenches

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{{Language-box|english_link=Water Portal / Rainwater Harvesting / Groundwater recharge / Contour trenches | french_link= Coming soon | spanish_link= Coming soon Trincheras de contorno | hindi_link= Coming soon वाटर पोर्टल / वर्षाजल संचयन / भूजल पुनर्भरण / समोच्च-कंटूर खत्तियाँ | malayalam_link= Coming soon | tamil_link= Coming soon | korean_link= Coming soon | chinese_link=等高沟 | indonesian_link= Coming soon Parit kontur | japanese_link= Coming soon 水のポータル サイト / 雨水貯留 / 地下水涵養 / 等高線濠}}

[[Image:contour trch icon.png|right|80px]]

Experience from Vietnam showed that in 5 out of 7 shallow wells that were near the trenches with water tables of between 3 and 18 metres below ground level, showed an increase in water levels after rainfall events of over 60mm because of infiltration from the contour trenches. It seems that recharge of groundwater is not certain according to local sub-surface conditions – in Vietnam, water levels in 2 out of the 7 wells near the trenches were unaffected. This is probably due to certain geological layers blocking infiltration. So it is always a possibility that trenches will not affect water levels.

[http://web.archive.org/web/20151019103949/http://www.ektitli.org/2011/11/21/successful-water-conservation-in-awalkhed-village-nasik/ Successful Water Conservation in Awalkhed Village, Nasik.]

===Manuals, videos, and links===

* Manual: [http://www.bebuffered.com/downloads/sussman_contour_trenches.pdf Design Manual: Contour Trenches] - Using the "A" frame and how to make a contour trench.

* Large wiki on water use for agriculture: [http://web.archive.org/web/20151025174729/http://agropedia.iitk.ac.in:80/ Agropedia]

===Acknowledgements===

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Winona

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