Barrage Presentation 1v426c

A PRESENTATI ON ON

DESIGN OF BARRAGE

BY GROUP-7

CONTENTS WHAT IS BARRAGE WORKING PROCESS OF A BARRAGE ADVANTAGES AND DISADVANTAGES INVESTIGATION AND DATA REQUIRED LOCATION AND ALIGNMENT PLANNING AND LAYOUT HYDRAULIC DESIGN CONCLUSION REFERENCES

WHAT IS BARRAGE ? A barrage is a low type of diversion dam which consist of large gates that can be opened or closed to control the amount of water ing through the structure. The gates are set between flanking piers which responsible for ing the water load of the pool created.

DIFFERENCE BETWEEN DAM AND BARRAGE  Dams and barrages are barriers

constructed across a river or a natural water course for diverting water into a canal for the purpose of irrigation or water supply, or into a channel or tunnel for generation of electricity.

A barrage is an artifcial obstruction at the mouth of a river that is used to increase its depth to assist in navigation or for irrigation purposes.

Dams are artifcial barriers across a flowing river or any other natural water body that are meant to obstruct, direct, or slow down the flow of water, thus creating a reservoir or a lake.

DAM

VS BARRAGE

WORKING PROCESS OF A BARRAGE

ADVANTAGE S

The main advantages of the barrage is to supply the water for irrigation purpose It provide protection against coastal flooding Electric power can be generated

DISADVANTA GES

Salt water causes corrosion. Maintenance of a power facility can be difficult. A barrage is very expensive to build and affects a very wide area.

INVESTIGATION AND DATA REQUIRED

TYPES OF INVESTIGATION

Preliminary investigati on

Detailed investigati on

PRELIMINARY INVESTIGATION

Study of available maps. Study of available hydrological data. Assessment of water requirement. Availability of construction materials. Communication to the site of work.

DETAILED Detailed topographic survey(index map, site survey plan, cross sections & INVESTIGATION longitudinal section) Hydrological data-Rain fall, Discharge data (daily, monthly, annual), flood hydrographs, observed flood marks Surface and subsurface investigations including laboratory tests. Bore holes up to hard rock level or 10 to 25 m below river bed level . One or two bores for each bay, at body wall, U/s & D/s cutoff line . Availability of clay and its extent, depth & location . Rock strata: Trial pits to be excavated to know the over burden depth, loose deposits, depth of weathered zone, extent of ts & fissures for treatment to prevent seepage.

Water table.