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The New Ibrahimia Head Regulator (NIHR) is equipped with double leaf gates and the flow is planned to be passing over these gates. Sediment deposition is likely to occur upstream of the gates due to the reduction in the flow velocity in the zone of back water curve. This research aims at studying the effect of sedimentation on the flow characteristics of the NIHR. Physical modeling and regression analysis were employed to conduct this research. The sedimentation depth was taken as 25%, 50%, 75%, and 100% of the gate height. A length of 10%, 20%, 30%, 40%, and 50% of the distance between the existing and the New Ibrahimia Head Regulator was employed. The discharge coefficient increases with the increase of the sedimentation. A new stage-discharge relationship was developed in case of sediment and no sediment. A larger physical model is recommended to study the effect of upstream sediment on the downstream hydraulic jump.

This study focuses on estimating the flow discharges along the Nile River and its tributaries in Sudan. Thus, a fifteen years' data record from the year 1983/1984 to the year 1997/1998 was employed to estimate the transmission losses using the water balance approach. The Nile River and its tributaries are divided into subsequent reaches. The transmission losses are calculated as a percentage of the inflow discharges to each reach. These losses were found to be 1% to 2% on the Blue Nile, 2% to 7% on the White Nile, 1% on Atbara River, 1% to 3% on the Main Nile. A spreadsheet model was then developed to calculate the average annual flow discharges at Dongola Station on the Main Nile. Another data record of nine years was used to validate the model. A good agreement was obtained between the measured and calculated discharges. The results of this research could be a part of a mutually acceptable modeling system in the Nile Basin region.