flow hydrograph from peak flow

[misteranderson]

Hello everyone,
im new to HEC-RAS. im working on 2D unsteady flow analysis for floodplain mapping of future flows. using historical data i performed flood frequency analysis from which i got peak flow for 50 years. now i need to input flow hydrograph data in unsteady flow data editor at upstream boundary condition but i have only the peak flow value.
can anyone guide me through the process how can i get flow hydrograph ordinates from just peak flow value?
thankyou.

[cameron]

Do you have any nearby gages that have hydrograph data? If so you could just pick representative event and use a multiplier for your peak flows.

Are there any studies of nearby streams that have a hydrograph? You could use that with a multiplier.

You could also just create a single basin hydrology model and calibrate the lag time and CN value to match your peak flow.

you could also just run the 2D model with a constant flow of your peak and simulate a “Steady State” scenario.

[misteranderson]

thankyou for your response, i have chosen historical peak flood wave hydrograph and for the future return periods i used its factors times peak flow

[Author]

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