الفهرس Only 14 pages are availabe for public view
 |  | from | 134 |  |  |
| | | from | 134 | | |
Abstract
Hydraulic roughness of alluvial channels is considered one of the
main factors affecting the flow discharge.
Therefore, the ann of the present study is to evaluate the hydraulic
roughness of some canals in Sharkia Governorate. After careful surveying
and site inspection, five canals were selected to represent the irrigation
network III Sharkia the selection was including different degrees of
canals. The selected canals are Bahr Abou EI- Akhdar , Bahr Faqous and
Bahr Mowais, as main canals. EI- Samaana and Bahnabay canals were
chosen as distributary canals. It’s discharge covered a wide range of flow
discharge which was from 3.11 to 82.87 m 3/s.
Samples of soil of the boundaries material were collected and analysed
for determining the grain size distribution.
A regression analysis was carried out for field collected data. The
data included water levels of the canal intake structure, water depths
within the cross sections, average velocity, top width of the flow cross
section, and water surface slope. The relationship between the flow
discharge versus down stream water level, cross- sectional area, hydraulic
radius, and average velocity were plotted. Manning’s equation was used
to estimate the hydraulic roughness coefficient ”n” in the study.
Buckingham’s Pi theorem was used to develop a relationship to be
correlated with hydraulic roughness n. Two empirical equations were
developed for estimating the hydraulic roughness n as a function of the