Correlation of Radial Watershed Physical Parameters to the Unit Hydrograph Time Base

M. Firman, Mohammad Bisri, Ussy Andawayanti, Runi Asmaranto

Abstract

This study intends to investigate the radial watershed physical parameters that affect the unit hydrograph time base. The methodology consists of (1) determining the time base based on the unit hydrograph derived from data rainfall - the single peak of the flood, using the Collin method, (2) identifying the physical characteristics of the radial watershed, using Arc. GIS-based on topography map scale 1:50,000, and (3) investigating the relationship between the radial watershed physical parameters and the unit hydrograph time base, using the Pearson correlation method. The research locations are ten radial watersheds spread across South Sulawesi Province and several watersheds in Java Island. Ten radial watershed physical parameters have been tested. As a result, seven radial watershed physical parameters have a strong (R = 0.60 - < 0.80) to very strong (R ≥ 0.80) correlation, namely (1) topographic factors (T); (2) watershed area (A); (3) watershed perimeter (P); (4) the main river length (L); (5) factor of the main river length and the river length from outlet to nearest the center gravity of the watershed [L.Lc]; (6) river slope (S); (7) the main river length from outlet to nearest the center gravity of the watershed (Lc) and the remaining three parameters, namely upstream area of the watershed (RUA), the ratio between of the main river length and the river length from outlet to nearest the center gravity of the watershed [L/Lc] and drainage density (Dd) have a moderate to low correlation relationship (R < 0.60).

 

Keywords: radial watershed, time base, unit hydrograph, correlation.


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