HYDROLOGICAL MODELLING FOR KHUSHKHERA-BHIWADI-NEEMRANA INVESTMENT REGION, RAJASTHAN USING SWAT
In India the availability of accurate information of observed runoff is insufficient. However due to water scarcity great emphasis is now placed on preparation of proper watershed management program for conservation and development of land and water management. For the present study, watershed spanning Jaipur and Alwar districts of Rajasthan state of India, with outlet in Khushkhera-Bhiwadi-Neemrana Investment Region (KBNIR) in Rajasthan, under proposed Delhi-Mumbai freight corridor has been selected as the study area for deriving the optimum water use policies. Basic data of the study area were generated with the help of freely available remotely sensed information. Total watershed area is 2995.84 km2, in which 73.27% is agriculture area. The major soil in watershed area is older alluvial soil. On digitization, ArcSWAT created four hundred sixty four hydrological response units by defining unique combinations of the land use, soil cover and slope conditions. By providing all the inputs for model set up, SWAT model was run for the period of thirty five years (1979–2014). Result of actual evapotranspiration and discharge is validated with the output of other modelling exercises of same area. Total average annual surface runoff is calculated to be 94.79 mm out of which highest average monthly runoff is 34.79 mm in the month of July. Total average runoff for the monsoon month is 92.55 mm which is 97.63% of total runoff. Output of this model can be utilized for development of optimum water resource and agricultural management policies of newly development of KBNIR.