The field experiments were conducted to compute the Manning‟s roughness coefficient initiated during the flow in lined and unlined watercourses located at the Chhounia field near the field of AICRP on IWM and the Brick field beside the KV, Dr. RPCAU, Pusa (Bihar). The average bed slope of the lined watercourse was found to be % whereas that of unlined watercourse was observed to be %. . The discharge . rate of water flow was determined in both the lined and unlined watercourses with the help of the weir and the Parshall flume, respectively. | Estimate roughness coefficient and water lost during the flow in the watercourse situated in the Pusa Farm
