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Environmental protection of residential areas from flash flood hazard necessitates the prior estimation of peak discharge and lag time. Thus estimation of flash flood hydrograph at a watershed outlet is essential for hydrologic flood control design and warning system design and operation. Lag time and peak discharge are the most important parameters that affect the flash flood hydrograph estimation. Hydrological models employ many different equations to calculate these parameters. This paper concerns to calculate losses parameters using measurement data of rainfall and runoff hydrographs of Wadi Sudr, Sinai, Egypt. Then watershed modeling system "WMS" is applied using all available lag time equations and adjusted losses parameters. In addition, peak discharge is estimated using the equations of SCS dimensionless synthetic unit hydrograph. The output hydrograph of these equations is compared to field data in order to propose the best equations to calculate runoff hydrograph. The output results indicate that there is no optimal method to calculate both of lag time and peak discharge in the study area. As a result, dimensional analysis is used to develop a new lag time and peak discharge equations of Wadi Sudr using the measured data of different storms. The developed equations enable the prediction of the lag time to an accuracy of 7% error and peak discharge to an accuracy of less than 14% error which enables Wadi Sudr to be environmentally protected from flash flood hazards

ESTIMATION OF LAG TIME AND PEAK DISCHARGE OF FLASH FLOOD OF WADI SUDR IN THE SINAI PENINSULA