Nonparametric hydrographs, constructed by the method suggested by Archer, are usually used
for developing parametric design hydrographs. Flow changes in time are described by the UPO
ERR Gamma complex function, which denotes a Gamma curve reformulated to have a Unit
Peak at the Origin (abbreviated to UPO), supplemented by the Exponential Replacement Recession
(ERR) curve. It may be observed, that this solution does not work in some areas of the
upper Vistula and middle Odra catchments when the times of the rising limb of a hydrograph
are higher than the times of the falling limb, i.e. when the skewness coefficient approximates
0.5 or higher values. Better results can be achieved with the function suggested by Strupczewski
in 1964. It is a solution which uses two parameters of the flood hydrograph.
The objective of the present paper is to assess the Strupczewski method by comparing it
with a complex UPO ERR Gamma function for gauged cross-sections in the upper Vistula and
middle Odra catchments. The assessment was carried out for 30 gauged cross-sections (15 in
each river catchment). The parameters were optimized for width-hydrograph descriptors W75
and W50, designed by the Archer method, and for the skewness coefficient s. Optimization
using only two width-hydrograph descriptors aims to test how the Strupczewski method works
for cross-sections for which the values of width-hydrograph descriptors W75 and W50 are
known. The assessment of both methods was carried out with reference to a nonparametric
hydrograph constructed by the Archer method. The results of these assessments suggest that
the Strupczewski method may be used not only for gauged cross-sections, but also for ungauged
ones.
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