The error in the discharge coefficient (including C,) of a rectangular profile weir, con- structed with reasonable care and skill, may be obtained from the equation. Weirs in the irrigation system of The Fayoum Governorate in Egypt have been modified: crests have been widened and pipes have been installed. As a result. Weirs in the irrigation system of The Fayoum Governorate in Egypt have been Hydraulic theory on flow over weirs and through pipes was subsequently used.

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Of soil under water. Classification of Weirs According to Geometrical Shape. Determination of the uplift diagram.

Lane suggested that a weight of three should be given to vertical creep and a weight of one to horizontal creep. I- Hydraulic Design of Weirs. Two weirs have to be constructed at the entrance of each canal.

Objectives of Wei rs in I rrigation Canals.

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Therefore we fahoum the 2nd experiment. Reducing head on existing structures. The scour continues until the energy of the flowing water reaches the normal channel energy. Classification According to Crest Length B. Ability of fluid to move in the soil under certain head dimensions of velocity. Must cause minimum Loss in Head. Bligh supposed that the dissipation of head per unit length of creep is constant throughout the seepage path.


Flow of Water in a Channel is controlled either by: Structural Design Empirical Dimensioning — check of stability.

For lands having mild slopes or flat lands. For lands having steep slopes Regulators: Weirs for reducing water slope fqyoum steep lands. H n varies until H critical soil particles begin to move. Proper distribution of water carried by a main canal among the branch canals depending upon it.

Classification According to Position in Plan. Scour may be defined as deepening and widening of water channel under the influence of the flowing water with high velocities.

Design head H is the biggest of 12and 3. Percolation is the flow of water under the ground surface due to an applied differential head. For proper Design of Water Structures: Determination of Percolation Length To determine the critical head: Reducing the hydraulic slope gradient in a canal if canal water slope is greater than the allowable water slope. wfirs

Soil i cr F. T he length of the seepage path transversed by the water is known as the length of creep percolation length. Seepage or percolation below weirs on previous soils: Percolation length creep length is the length to dissipate the total hydraulic pressure on the structure.


Undermining Piping is to carry away wash soil particles with flowing water below the ground surface causing collapse fayojm failure of the above structure.

Fayoum Weir Drawing • Topic •

Hydraulic Design determination of crest level and weir length according to head. Collecting sediments at US of structures sand strap.

Actual percolation length is smaller than designed. For lands having steep slopes. Water percolation length takes a short cut from a to b. Design of Weirs is divided to 3 parts: III — Detailed Drawings.

Percolation length is the path length from a to b.