How have others solved their issues of water in agriculture, managed their wastewater, developed their watersheds successfully, built innovative models for sanitation, etc.? The case studies are an insight into learning from others' experiences without having to reinvent the wheel.
"Water and Livelihoods: SRI in Large Irrigation Projects in Andhra Pradesh, India" -- the experience of the organisation JalaSpandana
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  JalaSpandana website
A case study from IWMI on the use of untreated urban wastewater for agriculture in Haroonabad, Pakistan.
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A collection of papers comprising both research and farmers experiences on SRI in Orissa, presented at the National Symposium on SRI in 2007. Size 2 MB
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Baba Amte Centre For People's Empowerment - a Support Voluntary Organisation powered by Samaj Pragati Sahayog
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Swadhina helped the Adivasis of Jharkhand start afresh on hostile terrain by introducing a novel method to conserve water and enhance agricultural production for self -sufficiency.
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Ramakrishna Mission Lokasiksha Parishad (RKMLSP) undertook a unique project of Land Shaping that provided sufficient rain water for crop irrigation as well as prevented water stagnation.
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Improved quality of life through bunding activities- Maragondanaguni Micro Watershed
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The Land Shaping Project (LSP) in the coastal part of Sundarbans helped in creating year round crop production, aqua-culture, generating income throughout the year, controlling migration, better diet and balancing the mono-cropping risk.
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In Nayakatenithe, a small village in Orissa, the community took development into their own hands and were able to design, implement and construct a water harvesting structure.
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Read about the effort made by the farmers of Kamasamudram to increase organic matter in the soil by using leaves as manure by planting trees on bunds.
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Case study on the experience of RASTA in Wyanad, Kerala, in System of Rice Intensification (SRI).
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WASSAN's experiences with SRI in Andhra Pradesh. Size 0.9MB
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Advocating traditional water harvesting as a solution to Western Orissa's perennial drought - a case study of Padiabadmal village in Sambalpur district
  http://www.worldproutassembly.org/archives/2006/05/traditional_wat.html
The Sustainet project of the German Council for Sustainable Development produced a book: "Sustainable Agriculture: A pathway out of poverty for India's rural poor" with examples of sustainable agricultural approaches. These include the following case studies of good water (and land) management initiatives:

Krushi, an NGO focusing on rights of marginalized communities, is combining a rights-based approach with watershed management techniques in a watershed in Andhra Pradesh.
Agragamee in Orissa bases watershed management work on local people's own knowledge.
Cecoedecon has helped farmers get organized so they can overcome problems of drought and erosion, shortage of food and fodder, and even polluted wells. The low-lying wetlands of the Sundarbans of West Bengal suffer from too much water for much of the year. The Ramakrishna Mission Ashrama has developed a technique called "landshaping" that enables farmers to grow a variety of crops on raised or sunken beds.
The Indo-German Bilateral Project (IGBP) worked in four states at different levels: national, state and local, and was a pioneer in integrating the different approaches used by NGOs and government agencies to promote watershed development.
Vikasa was one of the NGOs involved in the IGBP in Andhra Pradesh. It helped farmers in one watershed halt erosion and grow more food - and helped the villagers understand and collaborate in the work of the government agencies in the same watershed.
  Part 1: http://www.sustainet.org/download/sustainet_publication_india_part1.pdf
  Part 2: http://www.sustainet.org/download/sustainet_publication_india_part2.pdf
Sharing Best Practices in Rural Development - Case studies of few success stories in Rajasthan and UP
  http://planningcommission.nic.in/reports/sereport/ser/stdy_bstpRD.pdf
Western India Rainfed Farming Project focused on the introduction of new crop varieties, improved livestock breeds, micro irrigation, tree planting and joint forest management and soil & water conservation in the first phase. The second phase has evolved a more holistic and sustainable approach to livelihoods support.
  http://www.dfidindia.org/success/wirfp.htm