Half Moons

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How Half Moons and Bundts Restore Groundwater

• Water Capture and Infiltration: These structures are dug with the opening facing uphill. When rain falls, water collects in the bunds where it slows down, sinks into the ground, and replenishes underground water reserves. ^{[f90l2o] [6gfsvy]}
• Erosion Control: By arresting surface runoff, bunds prevent soil erosion—a major problem in arid areas—and ensure water remains on-site long enough to percolate. ^{[3omvuf] [6gfsvy]}
• Vegetation Recovery: Increased soil moisture within and around the bund encourages natural vegetation growth, which further decreases evaporation and enhances the local microclimate—supporting long-term groundwater recharge. ^{[3omvuf] [vo4dh1]}

Quantified Success and Case Studies

• In the Amboseli region (Kenya), the WWF-Kenya project aims to restore 20,000 hectares using Half Moon Bunds. Experts report not only increased green cover and biodiversity but that these structures "conserve rainwater runoff, replenish groundwater, and provide a sustainable water source for local communities and wildlife". ^[vo4dh1]
• In Odisha, India, the introduction of modified crescent bunds has enabled the harvest of up to 6,000 cubic meters (6 million liters) of water per rainfall event. This has led to noticeable increases in cashew yields and soil moisture, promoting more groundwater recharge. ^[ayhb2h]

Additional Benefits and Broader Impacts

• Biodiversity and Microclimate: Return of vegetation and habitats helps cool the microclimate, improve biodiversity, and provide fodder/fruit resources for local communities and wildlife. ^{[3omvuf] [vo4dh1]}
• Climate Resilience: Enhanced soil moisture and vegetation cover mitigate drought effects, store carbon, and improve land productivity. ^[vo4dh1]

Summary Table: Advantages of Half Moons and Bundts

Citations