الفهرس 
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Abstract
Studying watershed characteristics and choosing the most applicable
methods to determine the amount of excess rainfall that ran off is very
important in many engineering applications, especially hydrology
applications. That is to know the more suitable methods for protection
against floods and to maximize benefits from the excess water.
This study aims to make a comparison between the rational method
and the SCS method. A subbasin in Wadi Dahab in Sinai, Egypt is
investigated as a study area, and a comparison between the SCS typeII
distribution and Short duration rainfall distribution in arid regions.
To achieve the study aims, WMS software is chosen, which can
analyze a watershed by using DEM and delineating basins. It calculates also
important watershed parameters like area, runoff distances, and slope.
Hyfran-plus software is employed to locate the maximum depths for
different return periods. Various values for the time of concentration are
studied.
from the obtained results, for the time of concentration till 2 hours,
the difference between the two methods was great and decreased obviously
for all return periods.
For the time of concentration from 2 to 4 hours, the difference
between the two methods was 26.77: 49.97% for return periods of 200,
100, and 50 years. While the difference between the two methods was
64.83: 94.61% for return periods of 20,10,and 5 years.
For the time of concentration from 4 to 6 hours, the difference between the
two methods was 26.19: 47.51% for return periods of 200, 100, and 50
years. While the difference between the two met hods was 63.65: 92.98%
for return periods of 20,10,and 5 years.