Runoff and Peak Discharge Estimation of Kakaramanahalli Milli Watershed
In the present study an attempt is being made to carry out the morphometric analysis, runoff estimation and peak discharge estimation of Kakaramanahalli milli watershed which is located in Ramanagara district, Karnataka. From morphometric analysis, the drainage network shows that the terrain exhibits dendritic drainage pattern, Stream order ranges from 1st to 4th order, drainage density is 2.97 km/km2, the watershed is elongated in nature. For the runoff estimation the daily rainfall data of influencing rain gauge station (1980 to 2015) was used to estimate the daily runoff from the catchment using NRCS-CN method. The maximum runoff of 473 mm and a minimum runoff of 8.2 mm occur during a period of 36 years. The value of coefficient of correlation between rainfall and runoff is 0.7252. The peak discharge is estimated using two methods one is empirical and other is Rational method. The peak discharge obtained from the empirical method is greater than the peak discharge obtained from Rational method for different return periods.