Estimation of Evaporation Losses on Dharoi Dam

Abstract

In this study, the Evaporation losses at Dharoi dam is studied. The data like temperature, wind speed,
relative humidity and pan evaporation are collected and analysis is done taking in account five different
methods for computation, those methods are Meyer’s method, Rohwer’s method, Papadakis method,
BlaneyCriddle method, Thornthwaite method and Evaporation rates are estimated using these five
different methods. The computed values of evaporation rates are compared with the values of evaporation
measured by Pan.The most efficient method is Papadakis method for the period of 2001 to 2014. The
average evaporation rate isfromPapadakis method evaporation values obtained from the calculation were
ranging from 0.15 mm/day to 5.96 mm/day with an average of 3.16 mm/day. These values are near to the
Pan Evaporation values. For improving the results of the values of the Evaporation (mm/day) from the
different methods. In season wise computation, the Thornthwaite method is suggested for winter season
and Papadakis method is suggested for summer and monsoon season. The Correction factors are
determined for all the seasons of each method. The Statistical analysis is also done for each method. From
statistical analysis, Thornthwaite method is the most efficient method for computing evaporation rate.