Authors
Abstract
Al Husa'chi River is one of the three main branches of Al Ka’hla River in Maissan
governorate. Its length is 25 km. the river directly feeds Al Huwayza Marsh by overpass
pipes at its end. It is also used for irrigating the nearby agricultural areas. A study for
evaluating the hydraulic performance of the river has been carried out in order to develop
its ability to accommodate the excess inflow required for feeding the marsh and the
surrounding agricultural projects. All the necessary hydraulic measurements, needed to
construct rating curves, at stations along the river course were carried out for a period of
six months. A steady one dimensional hydraulic model has been prepared to simulate
the flow in this river using the HEC-RAS software (Version 3.1.3). The calibration and
verification processes of the model have been carried out by making use of the field
measurements. The obtained maximum allowable discharge of this river for the present
conditions is ranged from 20m3/sec to 35m3/sec for the water surface elevation of the
marsh from 7.0m to 2.8m amsl, respectively, and the first flood section is located at
23.5km downstream of the river inlet. The required cross sections to develop the capacity
of the river have been obtained considering the marsh and agricultural requirements
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