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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For lands having mild slopes or flat lands. Weirs for reducing water slope in steep lands. I- Hydraulic Design of Weirs.

Percolation length is the path fatoum from a to b. Of soil under water. Ability of fluid to move in the soil under certain head dimensions of velocity. Scour may be defined as deepening and widening of water channel under the influence of the flowing water with high velocities.

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Undermining Piping is to carry away wash soil particles with flowing water below the ground surface causing collapse or failure of the above structure. Actual percolation length is smaller than designed. Determination of Percolation Length To determine the critical head: T he length of the seepage path transversed by the water is known as the length of creep percolation length. Classification According to Crest Length B. Therefore we carry the 2nd experiment. Classification According to Position in Plan.


Two weirs have to be constructed at the entrance of each canal. Proper distribution of water carried by a faylum canal among the branch canals depending upon it.

For lands having steep slopes Regulators: Bligh supposed that the dissipation of head per unit length of creep is constant throughout the seepage path. Percolation is the flow of water under the ground surface due to an applied differential head. Fayoim of Wei rs in I rrigation Canals. Percolation length creep length is the length to dissipate the total hydraulic pressure on the structure. Seepage or percolation below weirs on previous soils: Design of Weirs is divided to 3 parts: Soil i cr F.

For lands having steep slopes. Reducing head on existing structures.

The scour continues until the energy of the flowing water reaches the normal channel energy. 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. Classification of Weirs According to Geometrical Shape. Reducing the hydraulic slope gradient in a canal if canal water slope is greater than the allowable water slope. For proper Design of Water Structures: Must cause minimum Loss in Head. Hydraulic Design determination of crest level and weir length according to head.


Structural Design Empirical Dimensioning — check of stability. Flow of Water in a Channel is controlled either by: Design head H is the biggest of 12and 3. 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. III — Detailed Drawings. Collecting sediments at US of structures sand strap.