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Reservoir sedimentation & its control
1. • Name : Zahin Rana
• ID NO : 17CE120
• Division : 2 (C2)
• Subject :- Hydrology and Water Resource Engg.
• Subject code :- CE302
• Submitted to :- Prof. Neha Patel
BVM ENGINEERING COLLEGE
3. CONTENT :
• Introduction
• Reservoir Sedimentation
• Types of sediment
• Causes of sedimentation
• Reservoir sedimentation control
• References
4. INTRODUCTION
“ What is a reservoir? “
It is an area developed by water
body due to construction of dam.
• A reservoir is, most commonly, an enlarged natural or
artificial lake, pond or impoundment created using a dam
or lock to store water.
• Reservoirs can be created in a number of ways, including
controlling a watercourse that drains an existing body of
water, interrupting a watercourse to form an embayment
within it, through excavation, or building any number of
retaining walls or levees
5.
6. RESERVOIR SEDIMENTATION
• All rivers carry certain amount of water of sedimentation
which is produced due to erosion in their catchment areas.
• These sediments are deposited in the reservoir on the
upstream of the dam because of reduction of velocity.
Sedimentation available reduce the capacity of the
reservoir.
• Continuous sedimentation, the useful life of the reservoir
goes on decreasing.
• If the soil in the catchment is loose and erodible, the
sediment load is large.
(Cont’d)
7. RESERVOIR SEDIMENTATION
• In case of catchments having steep slopes, the sediment
load is large because of high velocity of water.
• If the catchment area has no vegetal cover, the soil is easily
eroded and the sediment load is large.
• If the intensity of rainfall is high, the discharge in the river
is increased and the sediment load is large.
8. TYPES OF SEDIMENTATION
The sediment load carried by a river may be divided
into the following two parts:-
1) Suspended load
2) Bed load
1.) Suspended load :-
The rive The suspended load is that part of
the sediment load which does not move in contact with
the bed of r It consists of relatively finer materials
2.) Bed load :-
The bed load is that part of the sediment load
which moves in contact with the bed of the river. It
consists of relatively coarser materials.
9.
10. CAUSES OF SEDIMENTATION
The following are the different causes of
sedimentation :
• Nature of soil in the catchment area
• Vegetation cover in the catchment area
• Topography of the catchment area
• Intensity of rainfall
• Cultivation of land
11.
12. SEDIMENTATION CONTROL
• Selection of suitable site
• Proper design
• Control of sediment inflow
a) check dam b) vegetation screens
• Control of sediment deposition
• Removal of sediment deposits
• Soil conservation
13. REFERENCES
1. Reservoir sedimentation – Wikipedia
https://water.fandom.com/wiki/Reservoir_sedimentatio
n
2. Reservoir sedimentation and its control – Wikipedia
https://en.wikipedia.org/wiki/sediment_control
3. 3. Reservoir capacity – Wikipedia
https://en.wikipedia.org/wiki/Reservoir
Book
1. Engineering hydrology By k. Subramanyam
2. Physical Hydrology - S. Lawrence Dingman
3. Hydrology: principles and processes - M. Robinson, RC
Ward
