WATER RESOURCES AND AGRICULTURE IN WESTERN INDIA
Impact assessment of climate change on the water resources and agriculture in Banas basin in Western India
The Banas river basin located in the State of Rajasthan in western India has been selected for applying the products of C3S Global Service. The basin falls in an arid region of the country, with low water availability and recurrent droughts. Bisalpur drinking water cum irrigation project is constructed across river Banas. Climate indicators namely, temperature (min & max), rainfall, solar radiation, soil moisture, water temperature and drought indicators will be used in the Banas basin to assess the future climate impacts on the water availability in the Bisalpur reservoir and crop yields in the command area.
CASE STUDY DESCRIPTION
Issue to be addressed
Project Area (Banas River Basin) is the largest river basin (45,833 sq km area) within the Rajasthan State of India. Banas is a seasonal river that dries up during the summer, but it is nonetheless used for irrigation. Bisalpur drinking water cum irrigation project is constructed across river Banas with an ultimate irrigation potential of 55224 hectare (irrigation during the months of October to March for the Rabi crop), besides providing 458.36 MCM of drinking water for Jaipur, Ajmer, Beawar, Kishangarh, Nasirabad and other enroute cities/town/villages. An estimated 150 Million US$ of extra agriculture was produced in year 2014-15. An increase in both the maximum and minimum temperature in this region has been observed from historical data. This may lead to shortening of the crop growth period, increase in crop water requirement and reduction in crop yield. The water availability in this reservoir in coming years will play a crucial role in the overall economy of the entire region including other socio-economic issues.Therefore, it is important to assess the water availability of this reservoir using climate impact indicators for future years and suggest suitable adaptation options.
Decision support to client
This study will help in planning for future Water Resources Management of the Bisalpur Dam Project using the CIIs developed specific to the Banas basin.
Temporal and spatial scale
The results of this case study will help decision making at a local/regional scale (approximately 40,000 sqkm area including Banas catchment upto Bisalpur dam and the downstream irrigation command area). The adaptation measures will be implemented over 20 years period.
Field visits are made to interact with client and other stakeholders. The field visits will be made before the monsoon period and after the monsoon to assess the water availability in the catchment for irrigation and drinking water. The best way of exploring the clients issues will be through regular interaction (through field visits and emails/video calls) and communicating the results of climate impact study, taking their feedback on the usefulness of the form of study results and modifications in the format of results to make them more generalized and useful for decision support. A stakeholder workshop/ user interaction workshop can be organized in the study area, in which user groups, stakeholders and policy makers can be invited. However, the present funding does not support this activity and can be taken if extra funds are available for the purpose.