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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Lane suggested that a weight of three should be given to vertical creep and a weight of one to horizontal creep.

Determination of the uplift diagram. I- Hydraulic Design of Weirs. Percolation length is the path length from a to b. For proper Design of Water Structures: Scour may be defined as deepening faypum widening of water channel under the influence of the flowing water with high velocities.

T he length of the seepage path transversed by the water is known as the length of creep percolation length. Objectives of Wei rs in I rrigation Canals. Classification According to Position in Plan. For lands having steep slopes Regulators: Reducing head on existing structures. Collecting sediments at US of structures sand strap. Undermining Piping is to carry away wash soil particles with flowing water below the ground surface causing collapse or failure of the above structure.


Design of Weirs is divided to 3 parts: Flow of Water in a Channel is controlled either by: Structural Design Empirical Dimensioning — check of stability. Design head H is the biggest of 12and 3.

Hydraulic Design determination of crest level and weir length according to head.

Ability of fluid to move in the soil under certain head dimensions of velocity. Soil i cr F.

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Proper distribution of water carried by a main canal among the branch canals depending upon it. For lands having steep slopes.

Classification of Weirs According to Geometrical Shape. For lands having mild slopes or flat lands. Of soil under water.

Fayoum Weir Drawing • Topic •

Actual percolation length is smaller than designed. III — Detailed Drawings. Therefore we carry the 2nd experiment.

Percolation length creep length is the length to dissipate the total hydraulic pressure on the structure. H n varies until H critical soil particles begin to move. Two weirs have to be constructed ewirs the entrance of each canal. Bligh supposed that the dissipation of head fatoum unit length of creep is constant throughout the seepage path. The scour continues until the energy of the flowing water reaches the normal channel energy. Classification According to Crest Length Fzyoum.


Seepage or percolation below weirs on previous soils: 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. Must cause minimum Loss in Head.

Water percolation length takes a short cut from a to b. Determination of Percolation Length To determine the critical head: Weirs for reducing water slope in steep weits.