Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Pays Bas → Impact of rainwater harvesting on downstream flow and crop production in Bhadar river basin Saurashtra, Gujarat (India)

UNESCO-IHE Institute for Water Education, Delft (2011)

Impact of rainwater harvesting on downstream flow and crop production in Bhadar river basin Saurashtra, Gujarat (India)

Kamboj S.

Titre : Impact of rainwater harvesting on downstream flow and crop production in Bhadar river basin Saurashtra, Gujarat (India)

Auteur : Kamboj S.

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science 2011

Résumé
In the last two decades, the Government of India, State Governments and NGOs have supported the construction of large number of check dams and small structures. More than four thousand check dams have been constructed in Bhadar River basin of Saurashtra area of Gujarat (India) by different departments till 2010. The total storage capacity of these structures has increased ten folds from 10 Mm3to over 100 Mm3in last decade. Generally these schemes are considered as benign (Batchelor et al., 2002 ; van der Zaag & Gupta, 2008). However, upstream shift in water partitioning may have complex and unpredicted downstream environmental and hydrological impact (Rockström et al., 2003). The combined effect of the check dams may be positive or negative depending upon the catchment characteristics and level of development. Bhadar River basin lies in a semi arid area of India, having average rainfall of 480 mm/a. This area is characterized by high temporal variability of rainfall, with 75% falling in less than 120 days. On average, there are less than 30 rainy days in a year (Kumar et al., 2006). Data collected for this study contains Hydrological data, information on check dams and crop data. The increase of storage in the catchment due to the construction of check dams was obtained from the check dam information. GIS software was used to identify the location of check dams within the catchment area. The crop area and total crop production were computed from the crop data (1990 to 2009). The hydrological data of 22 stations (1981 to 2009) was validated using cumulative mass plots. Trend analysis of rainfall and discharge has been carried out using Pettit’s trend test with the help of XLSTAT software (trial version). Comparison was made between before and after of check dams’ construction using monthly flow duration curves (FDCs).

Mots clés : rainwater harvesting ; crop production ; river basins ; India

Présentation

Version intégrale

Page publiée le 26 décembre 2014, mise à jour le 16 octobre 2018