الفهرس Only 14 pages are availabe for public view
 |  | from | 115 |  |  |
| | | from | 115 | | |
Abstract
The Irrigation Improvement Project (lIP) is one of the large-scale projects to help Egypt in order to sustain its ambitious development plan. The project involves a combination of technical changes and infrastructure investments, together with institutional and organizational changes in the way irrigation water is managed.
The main objective of the present study is to develop the existing improvements applied to the main and tertiary irrigation systems of Bisintaway command area. located in Damanhour district, in El-Beheira governorate. The selection of this command area is based on the fact that it is one of the pilot areas under improvement in the West Delta. It ICrVCS a moderate gross area of about 5500 feddans which is served through eleven sub¬bnnches and 115 mesqas. To achieve the goal of the study, different operation scenarios are introduced to the main irrigation system to investigate the effect of different factors on the performance of the existing lIP applied to Bisintaway branch canal. Whereas, proposed design criteria arc applied to the tertiary irrigation system to provide modified design guidelines at the mesqa level.
For the main irrigation system, HYDRO-lIP canal simulation model, which is currently used by the Ministry of Water Resources and Irrigation (MWRI), is introduced in this study. It is used to design the waterline along Bisintaway branch canal, to calculate the maximum discharges and velocities and to simulate the different operating scenarios. Among these scenarios is introducing the effect of the storage capacities of the sub¬branches of the canal on the water levels, discharges and velocities. The effect of decreasing the bed widths of Bisintaway canal is also studied along with an estimation of percentage of land saving. The effect of changing Manning’s roughness coefficient due to presence of weeds and canal lining is studied, in addition to the introduction of different abstraction patterns. Eight different abstraction patterns arc studied with significant variations noticed between the different cases and the existing waterline and the designed discharges and velocities through the canal. Field measurements of the water levels along Bisintaway canal arc also introduced to verifY the simulation model and check the actual performane of the canal under the lIP improvements.
Proposed design criteria are introduced at the tertiary level aiming to reduce the construction and operation costs. The proposed design criteria introduced in the study included the introduction of smaller capacity pumps to reduce the total installed capacity, and the total cost. Modifications arc introduced to the design criteria of the low pressure pipeline mesqas through decreasing the diameter of the used PVC pipes and increasing the maximum design velocity, as well as using pipelines under a pressure rating of 2.5 bar instead of the existing 4.0 bar pipes. These proposals arc proved to have significant effects on the cost of pipelines’ raw material, the hydraulic losses through pipes as well as the stands heights at the head of the pipeline mesqas. The existing raised-lined mesqas of Bisintaway canal arc proposed to be changed to pipelines whenever possible. A cost comparison between raised and pipeline mesqas is presented along with an estimation of the quantity of water lost by evaporation due to the exposed water surface of the raised mesqas and the percentage of land saving after the conversion of raised-lined mesqas to pipelines.