الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 172 |  |  |
| | | from | 172 | | |
Abstract
Side weirs are hydraulic structures that divert a part of the main channel flow into a side channel or into the air. Side weirs have many practical functions; (i) control and distribution of water discharges in irrigation networks, (ii) stormwater overflow from urban drainage systems, and (iii) spillway for earth dames to safeguard against flash floods. The present work focuses on studying the characteristics of flow passing over sharp or broad crested side weirs, side discharge, discharge coefficient, and water surface profile, in addition to both contracted and brink depth for the broad crested weir. Three shapes for the weir opening, either sharp or broad crested, are used: rectangular, parabolic, and triangular shapes. The discharge equation for the above three shapes is greatly affects the discharge coefficient and the little extent of the height and length of the weir crest. The analytical equations obtained from the specific energy equation application are verified via the experimental values of the discharge coefficient, contracted depth, and brink depth. As a result, good agreement is found with a maximum deviation of 7.0 %. The numerical model, flow 3-D software, is applied to start with initial discharges, then the corresponding water depth is gradually increased so that the steady state condition of flow is satisfied, then the side discharge and water surface profile are measured. The comparison between the numerical results with the experimental ones reveals an acceptable agreement with a deviation of less than 20% for about 90% of the comparisons.