1. GANDHINAGAR INSTITUTE OF TECHNOLOGY
“Reservoir”
Enrollment No Name
Anish Bhavsar
Internal Guide: prof. Hetal Dave Rajan Daxini
Ravi Gajjar
Nakul Kavaiya
Gandhinagar Institute of Technology: Department of Civil Engineering

2. Gandhinagar Institute of Technology : Department of Civil Engineering
Topics covered
Introduction
Types
Investigation
Site selection
Zones of storage
Gandhinagar Institute of Technology : Department of Civil Engineering

3. Gandhinagar Institute of Technology : Department of Civil Engineering
What is reservoir?
A reservoir is a artificial lake created by constructing a dam across a river.
A reservoir is created on upstream of a dam, built across a river or stream to impound part of the runoff from the catchment up stream of the dam site.
Gandhinagar Institute of Technology : Department of Civil Engineering

4. Gandhinagar Institute of Technology : Department of Civil Engineering
Purpose to provide Reservoir
Irrigation
Water supply
Hydroelectric power generation
Flood control
Navigation
Recreation
Development of fish and wild life
Soil conservation
Gandhinagar Institute of Technology : Department of Civil Engineering

5. Gandhinagar Institute of Technology : Department of Civil Engineering
Types Of Reservoirs
Depending upon the purposes served , reservoir may be classified as under:
Storage or conservation reservoirs
Flood control reservoirs
Distribution reservoirs
Gandhinagar Institute of Technology : Department of Civil Engineering

6. Gandhinagar Institute of Technology : Department of Civil Engineering
Storage or conservation reservoir
They store the water in the rainy season and to release it later when the river flow is low.
They used for supply of water for irrigation development, of hydro electronic power and domestic and industrial water supply.
Storage reservoir are also called conservation reservoir because they are used to conserve water.
Gandhinagar Institute of Technology : Department of Civil Engineering

7. Gandhinagar Institute of Technology : Department of Civil Engineering
Flood control reservoirs
A flood control reservoir is constructed to protect the area lying on its down-stream side from damages due to floods and hence it is known as flood protection reservoir or flood mitigation reservoir.
This reservoir is designated to moderate the flood and not to conserve water.
Gandhinagar Institute of Technology : Department of Civil Engineering

8. Gandhinagar Institute of Technology : Department of Civil Engineering
This type of reservoir serve only one purpose i.e. flood control hence these are designated as single purpose reservoir.
The flood control reservoir may be of two type:
Retarding reservoir
Detention reservoir
Gandhinagar Institute of Technology : Department of Civil Engineering

9. Gandhinagar Institute of Technology : Department of Civil Engineering
a) Retarding reservoir
This reservoirs stores a portion of flood when the flood is rising and releases it later when the flood is receding.
The high flood discharge is retarded and it takes long time for the flood water to flow completely towards the downstream area.
Gandhinagar Institute of Technology : Department of Civil Engineering

10. Gandhinagar Institute of Technology : Department of Civil Engineering
b) Detention Reservoir
This is one which is provided with outlets and spillway controlled by gates or valves.
The spill ways with adjustable gates are provided with the dam so that the flood water may be detained for sometime and then released according to the situation of downstream area by operating the gates of spillways.
Gandhinagar Institute of Technology : Department of Civil Engineering

11. Gandhinagar Institute of Technology : Department of Civil Engineering
3. Distribution Reservoirs
It is a small storage reservoir used for water supply in a city. Water is constantly pumped into the reservoir at constant rate and is supplied to consumers from reservoir.
Gandhinagar Institute of Technology : Department of Civil Engineering

12. Gandhinagar Institute of Technology : Department of Civil Engineering
Investigation for reservoir planning
Gandhinagar Institute of Technology : Department of Civil Engineering

13. Gandhinagar Institute of Technology : Department of Civil Engineering

14. Gandhinagar Institute of Technology : Department of Civil Engineering
2. Geological Investigation
Suitability of foundation for the dam
Water tightness of the reservoir basin
Location of quarry sites for construction materials
3. Hydrological Investigations
Study of runoff pattern of river at proposed dam site to determine the storage capacity of reservoir corresponding to a given demand.
Determination of the hydrograph of worst flood to determine spillway capacity and design.
Gandhinagar Institute of Technology : Department of Civil Engineering

15. Gandhinagar Institute of Technology : Department of Civil Engineering
Selection of site for reservoir
Topography is suitable for reservoir.
River valley should be narrow so, length of construction will be less.
Quantity of leakage is minimum. free from cracks, fissures, less percolation.
Basin should not submerged valuable land and properties.it should minimum.
Site should be avoid water from tributaries which carry high sediment.
On site adequate capacity is available for desired purpose.
Gandhinagar Institute of Technology : Department of Civil Engineering

16. Gandhinagar Institute of Technology : Department of Civil Engineering
Deep reservoir can be formed to reduce cost/unit area, water evaporation , less likelihood of weed growth.
Soil or rock should not contain soluble material, which reduce water quality.
Quality of water stored should satisfy desired purpose.
Easily accessible by road , by railway.
Construction material should be available nearby site.
Cost of associated work like road, rail, housing colonies ,etc. should be low.
Gandhinagar Institute of Technology : Department of Civil Engineering

17. Gandhinagar Institute of Technology : Department of Civil Engineering
Levels of Reservoir
Normal pool level (N.P.L.)
Minimum pool level
Maximum pool level
Gandhinagar Institute of Technology : Department of Civil Engineering

18. Gandhinagar Institute of Technology : Department of Civil Engineering
Zones of Storage
Various zones are as follows
Useful storage
Dead storage
Surcharge storage
Bank storage
Valley storage
Gandhinagar Institute of Technology : Department of Civil Engineering

19. Gandhinagar Institute of Technology : Department of Civil Engineering
THANK YOU
Gandhinagar Institute of Technology : Department of Civil Engineering