Modelling Small-Scale Storage Interventions in Semi-Arid India at the Basin Scale

Horan, R and Wable, P S and Srinivasan, V and Baron, H E and Keller, V J D and Garg, K K and Rickards, N and Simpson, M and Houghton-Carr, H A and Rees, H G (2021) Modelling Small-Scale Storage Interventions in Semi-Arid India at the Basin Scale. Sustainability (TSI), 13 (11). pp. 1-28. ISSN 2071-1050

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There has been renewed interest in the performance, functionality, and sustainability of traditional small-scale storage interventions (check dams, farm bunds and tanks) used within semi-arid regions for the improvement of local water security and landscape preservation. The Central Groundwater Board of India is encouraging the construction of such interventions for the alleviation of water scarcity and to improve groundwater recharge. It is important for water resource management to understand the hydrological effect of these interventions at the basin scale. The quantification of small-scale interventions in hydrological modelling is often neglected, especially in large-scale modelling activities, as data availability is low and their hydrological functioning is uncertain. A version of the GlobalWater Availability Assessment (GWAVA) water resources model was developed to assess the impact of interventions on the water balance of the Cauvery Basin and two smaller sub-catchments. Model results demonstrate that farm bunds appear to have a negligible effect on the average annual simulated streamflow at the outlets of the two sub-catchments and the basin, whereas tanks and check dams have a more significant and time varying effect. The open water surface of the interventions contributed to an increase in evaporation losses across the catchment. The change in simulated groundwater storage with the inclusion of interventions was not as significant as catchment-scale literature and field studies suggest. The model adaption used in this study provides a step-change in the conceptualisation and quantification of the consequences of small-scale storage interventions in large- or basin-scale hydrological models.

Item Type: Article
Divisions: Research Program : Asia
Uncontrolled Keywords: Demi-arid hydrology, Small-scale storage, Check dams, Tanks, Farm bunds, Cauvery, GWAVA
Subjects: Others > Watershed Management
Others > Water Resources
Others > Water Conservation
Depositing User: Mr Arun S
Date Deposited: 19 Aug 2021 08:56
Last Modified: 19 Aug 2021 08:56
Official URL:
Projects: UPSCAPE project
Funders: UK Natural Environment Research Council (NERC-UKRI), India Ministry of Earth Sciences (MoES)
Acknowledgement: UNSPECIFIED
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