Used for ppt

1. DAM AND
IT'S TYPES
PRESENTED BY:-
SANU BISWAS
B- TECH (CE) ,4th YEAR, 26301319102

2. DAM:
 A dam is a hydraulic structure of
impervious material built across a river or
stream to create a reservoir on its
upstream side for storing water for
various purposes.
 These purposes may be irrigation,
hydropower,water supply,flood control,
navigation,fishing and recreation.

3. STRUCTURE OF
DAM:

4. TYPE OF DAM:
Dams are classified on the basis of following
types:
 By structure
 By material

5. BY STRUCTURE:
 Arch dams
 Gravity dams
 Earth & Rockfill
dams
 Arch - Gravity dams

6. ARCH DAMS:
 Situated at narrow
canyon with steep side
walls
 Constant angle dams are
more common than
constant radius
 Double curvature
 Require good rock
foundation

7. GRAVITY DAMS:
 Force that holds dam is
earth's gravity pulling down
on mass of dam
 Well suited for blocking
rivers in wide valleys
 Dam is made from concrete
or masonry or both
 Foundation must have high
bearing strength

8. EARTH AND ROCKFILL DAMS:
Further classifications
Homogeneous
Constructed of only one
materials
 usually of sufficiently
impervious materials
Zoned Composed of a
central impervious core
flanked by zones of
considerably pervious

9.  It has characteristics of
arch dam and gravity dam
 They are made up of
conventional concrete or
RCC or masonry
 It is thinner than pure
gravity dams and require
less internal fill
ARCH - GRAVITY DAMS:

10. BY MATERIAL:
 STEEL DAMS
 TIMBER DAMS

11. STEEL DAM:
 Steel dams are also used as
temporary structures like
timber dams.
 Maintenance cost is high
due to rust and corrosion
 Steel dams an
experimentwhich failed

12. TIMBER DAM:
 Timber dam is a
temporary structure
constructed to divert
water for a temporary
period so the
construction of the main
dam can take place.
 Suitable location for
construction
 Timber dams were
widely used in early part

13. OTHER TYPES OF
DAMS:
Storage Dam :These dams are not mean to divert
or keep water out, but to keep water in.Storage
dams are the most common types of dams.
Cofferdam:A cofferdam is a temporary, portable
dam used for a variety of projects including
bridge repair, shoreline restoration, pipeline
installation, and many other construction
projects.They are reusable and compact for
transportation.
Detention Dam:Detention dams are specifically
constructed for flood control by retarding flow
downstream, helping reduce flash floods .

14. THANK YOU