The data that I have collected came from height gauging station which has an acquisition interval of 10 minutes and a weather station that records every 15 minutes. The site where the gauging station is located has an established rating thus I can derive stream discharge.
I am trying to create a unit hydrograph of storm and heavy rainfall events using these data sets. I have tried using the method stated from the link attached. But I am not sure if the results I have arrived at is satisfactory.
If possible, do you know any method that I could use to create a unit hydrograph? If so, what are the details of this method (procedure, etc.)?
Thanks in advance!
https://serc.carleton.edu/hydromodules/steps/derivation_unit.html
Maybe the Hydromad package in R statistical software might be intersting for you. It offers various methods for hydrograph modelling.
http://hydromad.catchment.org
There are a number of approaches you could use. Depends on what you call the unit hydrograph though. The original unit hydrograph looked only at storm flows, and required subtraction of any baseflows from the observed data. With the advent of models like IHACRES, the unit hydrograph was modified to include the slow flow component (and other components if these can be identified from the data).
Either way, one option is to use the technique described in
https://www.researchgate.net/publication/253953394_Exploring_changes_in_catchment_response_characteristics_Application_of_a_generic_filter_for_estimating_the_effective_rainfall_and_unit_hydrograph_from_an_observed_streamflow_timeseries
This is included in the Hydromad package. One question - what is the size of your catchment? Given that you have 10 and 15 minute resolution data (30 minute if you put them on the same timestep), then if the catchment is large enough, you should be resolving the flow peak. This may cause problems with the technique above, and if so, you will need to modify it to include something like a Nash cascade.
Conference Paper Exploring changes in catchment response characteristics: App...
Dear Dr. Barry Croke,
Thank you for your answer. I'll try to use this method.
For your question, the area for the catchment area is around 377 hectares. Is the area large enough?
Stream flow in the river as base flow and add hydrograph from rain fall data
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