Untitled Document
 
PROJECTS AND PROGRAMMES UNDER THE CHIEF ENGINEER, PROJECTS II, THIRUVANANTHAPURAM
 
   

 

PERIYAR VALLEY IRRIGATION PROJECT
 
       

         

 

               
The Periyar valley Irrigation project in Ernakulam district envisages the utilization of the tail race discharge from the completed Hydel scheme in the Muthirapuzha tributary of river Periyar together with the controlled release from Ennackal dam constructed by Kerala State Electricity Board under Hydel scheme across the Idamalayar tributary and the dependable run off from the uncontrolled catchment of Periyar river, for irrigating an area of 32800 Ha of land lying on the left bank of Periyar river through a net work of canal system and controlling devices. The above project helps in stabilization of first and second crops in an area of 32800 Ha and raising an additional crop in an area of 20000 Ha of 3rd crop (Puncha). Thus the gross potential ayacut of the scheme will be 85600 Ha and is spread over in Kothamangalam, Muvattupuzha , Kunnathunadu, Aluva, Kanayannoor and Parur Taluk in Ernakulam district.

Apart from Irrigation on left bank of Periyar, the Project also enables in the right bank of Periyar, supply of water to FACT, supply of minimum quantity of water through the river to check the intrusion of salinity at lower reaches as well as to meet the requirements of many lift Irrigation scheme of river Periyar. Supply of water for drinking purpose, Industrial purpose etc will be met by a portion of storage water by the barrage of Bhoothathankettu.

Details of the Project

       1. Periyar Barrage at Bhoothathankettu
           Length : 210.92m
           F.R.L : 34.95m
           Capacity : 169.791Mm 3.
       2. Main canal
           The existing Main canal up to the Head regulator having a length of 8 km is partially lined canal.
       3. Low level canal
           The balance length of the existing Main canal from 8 km to 28.78 km is an unlined canal.
       4. High level canal
           The High level canal starts from the Head regulator at 8 th km of the Main canal and having length of            24.312 km. This canal is fully lined.
      5. Branch canals
           13 Nos Branch canals 178.15km
           4 Nos Major distributories 42.3 Km
           126 Nos River distributories 464.731 Km

The project was declared as completed during the year 1992.

Salient features

Name

Periyar valley

1

ID

2

Type

Barrage

3

Composition

Masonry barrage at Bhoothathankettu

4

Purpose

Irrigation

5

Ayacut area

6

Catchment area

3048Km²

7

Completion

1966

8

Location

Kothamangalam

9

District

Ernakulam

10

Basin

Periyar

11

Sub-basin

12

Longitude

76° 40’

13

Latitude

10° 08’ 16”

14

Length of the dam

15

Crest level

Central span +24.59m,

Side span +25.81m

16

Maximum Water Level

+34.95 m

17

Full Reservoir Level

+34.95 m

18

Dead Storage Level

19

Water Spread Area

16.4Km²

20

Gross storage

169.79 MCM

21

Live storage

Diversion

22

Dead storage

23

Spillway Length

173.7 m

24

Spillway gates

15 Nos

25

Spillway type

Vent ways provided with electrically operated framed steel shutters with vertical lifting arrangements.

26

spillway gate size

3 no.s - 9.14m x 10.36m

12 no.s - 12.19m x 9.14m

27

Spillway discharge