Single and Two parameters hydrography separation method
Digital filtering method could be used to separate the quickflow (high frequency) and baseflow (low frequency) components from the total flow for a continuous hydrograph over a long term period.
1.Single parameter separation (Nathan and McMahon, 1990) a: baseflow filter parameter
2.Two parameters separation (Eckhardt,2005) a: baseflow filter parameter BFImax: maximum value of long term ratio of baseflow to total streamflow
References:
Nathan, R.J. and T.A. McMahon, 1990. Evaluation of Automated Techniques for Baseflow and Recession Analysis. Water Resources Research, 26(7):1465-1473.
Eckhardt, K., 2005. How to Construct Recursive Digital Filters for Baseflow Separation. Hydrological Processes, 19(2):507-515.