KANHIRAPUZHA IRRIGATION PROJECT



Salient features

1. General

State

Kerala

District

Palakkad

Taluk/Village

Mannarkkad/ Kanhirapzha

Latitude

58rsquo;N

Longitude

720 32rsquo;E

River

Kanhirapuzha

Year of Completion

1983

2. Structural Features of Dam

Type

Earth dam 1896m, Masonry dam 231.60m

Top Width

E-6.50m M- 4.30m

Bottom Width

E-146.00m M- 28.95m

Length

E-1896.40m M-231.60m

Maximum Height from bed

30.78m

level

Volume Content of Dam Body

1511000 M3

Slope ndash; upstream

E-1: 2.5 to 1:3.50 M- 10:1

down stream

1:2 to 1:2.50 10:6 to 10: 8.5

3. Hydrological Features of Dam

Catchment Area

70.00 Sq. Km

Probable Maximum Flood

504.00 cumecs

4. Spillway

Location

Centre portion

Type

Ogee type

Total length

36.6 m

Crest level

+ 92.5 m

Design capacity of spillway

512.50 cumecs

Number, type and sizes of gates

Vertical lift gate 3x 12.20 x 4.5744 m

5. Reservoir Features

Top of dam

100.28 m

Maximum water level

+97.535 m

Full reservoir level

+97.535 m

Minimum drawdown level

+77.400m

Dead storage capacity

1.6 Mm3

Gross storage capacity

70.8274 Mm3

Freeboard over F.R.L

2.745 m

Reservoir Area at F.R.L

4.65 m

Free board over M.W.L

2.745 m