baseflow filter using the recursive digital filter technique

baseflow separation from the river gauge measured streamflow

% This is a matlab version of Baseflow filter
% Based on Recursive digital filter techniques
% references:
% -J.G. Arnold and P.M Allen. Automated methods for estimating baseflow and groundwater recharge from streamflow records. Journal of the Americam Water Resources Association vol 35(2) (April 1999): 411-424
% -J.G. Arnold, P.M. Allen, R. Muttiah, and G. Bernhardt Automated base flow separation and recession analysis techniques. Ground Water vol 33(6): 1010-1018.
% Users can find more information about the technique at the SWAT website: http://swat.tamu.edu/software/baseflow-filter-program/