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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Seepage or percolation below weirs on previous soils: Water percolation length takes a short cut from a to b.

Classification of Weirs According to Geometrical Shape. Flow of Water in a Channel is controlled either by: Classification According to Crest Length B. I- Hydraulic Design of Weirs.

For lands having steep slopes. Percolation length is the path length from a to b. Hydraulic Design determination of crest level and weir length according to head.

Fayoum Weir Drawing • Topic •

Percolation length creep length is the length to dissipate the total hydraulic pressure on the structure. Determination of the uplift diagram. Classification According to Position in Plan. Weirs for reducing water slope in steep lands. Must cause minimum Loss in Head. Of soil under water. Ability of fluid to move in the soil under certain head dimensions of velocity. Reducing head on existing structures. cayoum


Actual percolation length is smaller than designed. For lands having mild slopes or flat lands. Undermining Piping is to carry away wash soil particles with flowing water below the ground surface causing collapse or failure of the above structure. Lane suggested that a weight of three should be given to vertical creep and a weight of one to horizontal creep. Collecting sediments at US of structures sand strap.

Objectives of Wei rs in I tayoum Canals.

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H n varies until H critical soil particles begin to move. Percolation is the flow of water under the ground surface due to an applied differential head.

Reducing the hydraulic slope gradient in a canal if canal water slope is greater than the allowable water slope. Two weirs have to be constructed at the entrance of each canal. Therefore we carry the 2nd experiment.

Bligh supposed that the dissipation of head per unit length of creep is constant throughout the seepage path.


Proper distribution of water carried by a main canal among the branch canals depending upon it. Design of Weirs is fayouk to 3 parts: Soil i cr F. Structural Design Empirical Dimensioning — check of stability. III — Detailed Drawings.

Scour may be defined as deepening and widening of water channel under the influence of the flowing water with high velocities. Determination of Percolation Length To determine the critical head: Design head H is the biggest of 12and 3. The scour continues until the energy of the flowing water reaches the normal channel energy.

T he length of the seepage path transversed by the water is known as the length of creep percolation length. For lands having steep slopes Regulators: For proper Design of Water Structures: