Compared between the Measured Seepage Losses and Estimation and Evaluated the Conveyance Efficiency for Part of the Hilla Main Canal and Three Distributary Canals (HC 4R, HC 5R and HC 6R) of Hilla-Kifil Irrigation Project

Abstract

Hilla-Kifil irrigation project in Babylon in Iraq consists of three sections: north, middle, and south. The constructed sections currently are: north, middle, and a small part of the southern section. This study was conducted on part of the Hilla main canal between two Kilometers (13.037 km) and (16.492 km) and three distributary canals are (HC 4R, HC 5R and HC 6R) in addition to the watercourses that branched thereof, these canals are lined, the aim of this study was to measured seepage losses from lined canals and checked the water conveyance efficiency. Seepage losses for lined canals that entered in this study were measured by inflow-outflow method and compared the results with the estimated losses by two empirical equations (Moritz and Davis-Wilson), using the reaches on the canals. The average seepage losses that was measured on Hilla main canal was (57.98 m³/s/10⁶m²), (39.52 m³/s/10⁶m²) for the three distributary canals (HC 4R, HC 5R and HC 6R). The standard deviation of the Hilla main canal was 22.98, (27.96) for three distributary canals. The results showed that were above the standards. The water conveyance efficiency for Hilla main canal and three Distributary canals (HC 4R, HC 5R and HC 6R) was checked. The results were (95.21, 83.68%, 81.20% and 90.33%) respectively, and when were compared with the design values ​​were less of them.

Keywords: distributary canals and watercourses, Seepage losses, conveyance efficiency, Moritz, Davis-Wilson, inflow and outflow method.