Analysis And Design Of Canal Structures (Cross Drainage Works)

Abstract

On it's alignment, a canal meets a number of natural drains, rivulets, streams and other obstructions such as roads, railways, valleys etc. When canal crosses any obstruction out of these, a suitable structure has to be provided to enable the canal to pass over or below the obstruction. This is referred as cross drainage works. Syphon and aqueduct are two different sub categories of cross drainage work. When the canal is made to pass below the drain the structure so built is called canal syphon. Canal syphon is underground type structure, which consists of upstream transition walls, inclined barrel, horizontal barrel, downstream transition walls, breast walls. When the canal is made to pass over the drain the structure so built is called aqueduct. Aqueduct is a bridge like structure. Aqueduct can use for both purpose, to pass water and vehicle traffic across an interception. Aqueduct consists of mainly two components like superstructure and substructure. Super structure consists of pipe, trough or box shaped barrel through which water flows depending upon the discharge. Sub structure consists of pier and foundation. Pier may be column type, wall type, hollow cellular type etc. The foundation can be open foundation, pile foundation, well foundation etc. depending upon the soil condition. Focus of the present study is to perform analysis and design of Canal syphon and Aqueduct. Two shapes such as Rectangular box shape and Circular shape are considered for canal syphon. In ordered to understand economy of both shape, comparison is done in terms of cost and head loss. Aqueduct is designed for both canal water and vehicle traffic load by considering rectangular barrel. Parametric study for economical design of aqueduct is performed. Span of aqueduct is varied to find the economical span.