Question

1.A 1000 ephemeral stream segment along the Town Creek near Tupelo, MS has a width of 30-m. The difference in elevation of the bottom channel for the upstream to the downstream section is 0.5m. A triangular hydrograph cumulating 10-cm of runoff that begins at 0m3/s reaches a peak of 35m3/s after the first hour of flow and returns to 0m3/s at the time 2.8-hr.If no lateral or overbank inflow is observed along the reach:

a.(15pts) Compute the outflow hydrograph for this reach selecting a time step of 0.1hr, a travel time constant of 0.285 hr and a weighting factor o f0.35.(use 4 decimal places for the outflow hydrograph to determine the routing time to reach the 0m3/s)(As you could submit your routingin Excel, hand/typing calculation are required for the time step that corresponds to your last digit of the net id. If 0 then 10th time step)Hint: The inflow hydrographs should have time steps of 0.1-hr from the beginning to the end.

b.(5 pts) Determine the lag time and peak flow attenuation(difference) observed between inflow and outflow hydrographs.

c.(15pts) Assuming the routing parameters remain constant, compute the outflow hydrograph for the following 1000-m reach segment.(use 4 decimal places for the outflow hydrograph to determine the routing time to reach the 0m3/s)(As you could submit your routing in Excel, hand/typing calculation sare required for the time step that corresponds to your last digit of the net id. If 0 then 10th time step

d.(5 pts) Determine the lag time and peak flow attenuation(difference) observed between inflow and outflow hydrographs.e.(5 pts) Is the runoff volume and the runoff depth changing along the reach? Validate your response with proper calculations and demonstrations.

f.(5 pts) Plot all three hydrographs in one same graph.

Answer 1