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Abstract
Proper analysis of temporal aspects of flood discharge is necessary for understanding the nature of water and sediment accumulation in floodplain and its time for concentration. Attempt is also made to understanding the nature of concentration of runoff at lower catchment by of simultaneous concentration from the major tributaries. Lower time of concentration and lower lag time show the potentiality of sudden discharge leading to flood situation. Shilabati watersheds have many subareas that contribute runoff to a single outlet. Some important sub watershed parameters are drainage area (A), where the volume of water is generated from rainfall and tributary length (L). These two parameters help to determine the time for concentration of runoff and sediment in channel. Another important physiographic parameter is channel slope or gradient which reflects the rate of change of elevation along the channel. Slope measured are used to calculate the time of travel to reach the runoff at main channel. Runoff concentration time and weighted curve number is measured after (SCS, USDA), 1990. Hydraulic radius is consistently decreased down valley. The processing of sediment data and the average concentration of sample sediment at the lower reach are determined.