Author(s): K; Banasik; L. Hejduk; L. Gradowski; A. Sikorska
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Abstract: Two flood flow hydrographs generated by rainfall events of probability of occurrence of 1% and duration 2 hours in a small (A= 26,9 km2) urban catchment of Sluzew Creek (south part of Warsaw) have been routed by detention pond of total flood storage of 27 100 m3. The IUH, and CN SCS methods were used to estimate the inflow hydrographs. The IUH has been estimated based on catchment characteristics according to SCS formulae. The inflow to the system has been reduced by the lateral outflow to detention part of the pond, when the water level in the channel was over the crest of the side overflow, and when there was free volume in the detention space. Level pool routing (modified Puls) procedure has been used for calculating the outflow hydrograph from the reservoir of known storage-outflow invariable relationship and given inflow hydrograph. Estimated reduction of the peak flow has been about 10% for the smaller flood hydrograph (QD max=6,28 m3/s, generated by rainfall on part of the catchment), and below 3% for the larger flood hydrograph (QD max=9,73 m3/s, generated by rainfall on the whole catchment).
Year: 2009