Eckhardt 2005 is a two parameters method for calculating base flow index, BFImax depends on aquifer type, is it porous or hard rock, but no information available and the catchment area is about 18 000 km2.
I would recommend using the technique that I published in 2010
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
When using a UH with two stores in parallel, if you assume that the slow flow component corresponds to baseflow (questionable - but a common assumption made by baseflow filters, including the Eckhardt filter), then the approach in this paper gives the BFI, as well as an estimate of the unit hydrograph and the effective rainfall. The approach uses a calibration method to estimate the parameters of the UH. The one used is the SRIV algorithm used in IHACRES and the Captain toolbox. However, you can use any calibration method you prefer.
Conference Paper Exploring changes in catchment response characteristics: App...
Perhaps try to apply several methods as contained in the BFI+ freeware (http://www.hydrooffice.org/Software/ListOfTools.aspx) where several tool can be applied for baseflow separation from a hydrogram. A choice of 11 separation methods are included, such as local minimum methods, fixed interval or sliding interval methods; and also methods of recursive digital filters... You can then compare results from several methods...
Thank you for answering. I know that there are several tools but I wanted to use Eckhardt 2005 method,My information is limited to only ( catchment area =18 000 km2 and I have daily flow data ). No information available for aquifer type. So how can I estimate BFImax?
if the catchment is so extensive, I as hydrogeologist would consider (nearly everywhere) the prevailng hardrock aquifer type...
Do you have any geological data for the catchment? Such as geological map..it will help to determine the aquifer type. If not you may try geological interpretation by using satellite imagery..
Thanks a lot. I have no geological map for the catchment and about 75% of the catchment area is laid out of Iraq (in Iran). I can't get the geological map, only I have 30 years daily inflow and catchment area.
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