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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Bligh supposed that the dissipation of head per unit length of creep is constant throughout the seepage path. For lands having steep slopes. Therefore we carry the 2nd experiment. Determination of Percolation Length To determine the critical head: Actual percolation length is smaller than designed.

III — Detailed Drawings.

For lands having mild slopes or flat lands. Ability of fluid to move in the soil under certain head dimensions of velocity.


Determination of the uplift diagram. Percolation is the flow of water under the ground surface due to an applied differential head.

Classification of Weirs According to Geometrical Shape. Soil i cr F. Hydraulic Design determination of crest level and weir length according to head. Lane suggested that a weight of three should be given to vertical creep and a faayoum of one to horizontal creep.

Weirs for reducing water slope in steep lands. For lands having steep slopes Regulators: T he length of the seepage path transversed by the water is known as the length of creep percolation length.

Flow of Water in a Channel is controlled either by: Classification According to Position in Plan. Reducing the hydraulic slope gradient in a canal if canal water slope is greater than the allowable water slope. Seepage or percolation below weirs on fagoum soils: Percolation length is the path length from a to b. Undermining Piping is to carry away wash soil particles with flowing water below the ground surface causing collapse or failure of the above structure.

Reducing head on existing structures. H n varies until H critical soil particles begin to move.

Fayoum Weir Drawing • Topic •

Water percolation length takes a short cut from a to b. Must cause minimum Loss in Head. Percolation length creep length is the length to dissipate the total hydraulic pressure on the structure.


Design of Weirs is divided to 3 parts: Objectives of Wei rs in I rrigation Canals. Of soil under water. Fagoum proper Design of Water Structures: Collecting sediments at US of structures sand strap. Design head H is the biggest of 12and 3. I- Hydraulic Design of Weirs. Proper distribution of water carried by a main canal among the branch canals depending upon it.

Two weirs have to be constructed at the entrance of each canal. Structural Design Empirical Dimensioning — check of stability.

Scour may be defined as deepening and widening of water channel under the influence of the flowing water with high velocities.

The scour continues until the energy of the flowing water reaches the normal channel energy. Classification According to Crest Length B.

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