Rainfall-surface runoff estimation for the Lower Bhavani basin in south India using SCS-CN model and geospatial techniques

摘要: Rainfall and surface runoff are the two most important components, which control groundwater recharge of basin. The long-term an aquifer gets affected by population growth, irregular agriculture activities industrialization. Hence, estimation rainfall-surface is very much essential for proper management practices. In present study, Soil Conservation Service Curve Number (SCS-CN) model was employed in combination with geospatial techniques to estimate Lower Bhavani River basin South India. To develop SCS-CN model, rainfall data were obtained 33 years (1983–2015) from 22 rain gauge stations spread over IRS LISS-IV satellite 5.8 m spatial resolution used analyze land use/land cover (LU/LC) behavior. Based on soil properties, four Hydrological Groups (HSG) identified significant estimation. (CN) values various Antecedent Moisture Conditions (AMC) such as dry condition (AMC I), average II) wet III). Spatial distribution CN plotted using Geographical Information System (GIS) entire Basin assess potential. results indicate that annual varies 267 mm (2002) 1528.6 mm (2005), 102.04 mm (1985) 463.02 mm (2010). outputs predict 211.99 mm, volume 81,995,380 m3. study also indicates nearly 53% area dominated high Finally, output potential validated Average Groundwater Level Fluctuation (AGLF) observed 57 wells AGLF ranges 2.32 21.72 m. categories satisfactorily matching categories. Moderate well moderate zones mostly occupy central portion basin, possess good However, lead more water flow into river channels, reduce infiltration rate decline table. This problem can be solved constructing suitable artificial structures across channels areas.