MALANKARA DAM PROJECT



The Moovattupuzha Valley Irrigation Project consists of a dam across Muvattupuzha River, a tributary of Thodupuzha river and a net work of canal system consisting of two main canals on either banks, its branches and distributaries to irrigate total area of 18,616 hectares of land in Idukki, Ernakulam and Kottayam districts. The dam and reservoir are located near Thodupuzha- Moolamattom road. The project area lies on the eastern side of Ernakulam; Trivandrum railway line between Piravom road and Ettumanoor stations. The Dam site is connected from MC road by Muvattupuzha ;Thodupuzha road and then by Thodupuzha - Moolamattom road. The project consists of a combination of Masonry dam having length of 254m and an earthen dam of length 206m.

Other benefits of the project are Drinking water supply, Industry (being developed), Fisheries, Tourism, Ground water Recharging, Domestic purposes and Power generation.

1.About the dam

The dam consists of a straight gravity dam of R. R Masonry on the right bank and in the river portion and earth fill in the left bank. The total length of the dam is 460m. The Earthen dam on the left 206m long has a maximum height of 12m. Masonry dam has a total length of 254 m of which 191.90m is non-overflow section and the balance 62.10 m is the overflow section. The spillway crest level is 36.9m and the top level of dam is +45.00 with a spillway section having 6 vents.

2. Salient features

1. General

State

Kerala

District

Idukki

Taluk/Village

Thodupuzha/ Muttom

Latitude

between9037,and1004;N

Longitude

between760 26;and760 49, E

River

Thodupuzha(Tributary of Muvattupuzha)

Year of Completion

1994

2. Structural Features of Dam

Type

Straight Gravity Rubble Masonry, Earthen

Top Width

Masonry 5.00m, Earth6.90m

;

Bottom Width

16.70m

Length

Masonry 254m, Earth 206m

Maximum Height

Masonry 23.0m, Earth12.00m

Slope upstream down stream

3. Hydrological Features of Dam

Catchment Area

153.5sq.km

Probable Maximum Flood

1444.32 cumec

4. Spillway

Location

Type

;Ogee with radial gate

Total length

;62.100

Crest level

+36.900m

Design capacity of spillway

1442.32Cumecs

Number, type and sizes of gates

6 nos, Straight 7.6x 6.40 m

5. Reservoir Features

Maximum water level

;+43.00m.

Full reservoir level

+42.00m.

Minimum drawdown level

+39.00m.

Dead storage capacity

27 Mm 3

Gross storage capacity

38.00 Mm 3

Freeboard over F.R.L

;3.00