PERIYAR VALLEY IRRIGATION PROJECT



Salient Features

1.GENERAL

State

KERALA

District

ERNAKULAM

Taluk / Village

Kothamangalam

Latitude

10ordm; 0839;16quot;

Longitude

76ordm; 4039;00quot;

River

Periyar

2.STRUCTURAL FEATURES OF DAM

Type ndash; If more than one type give details of each type

Masonry barrage.

Top Width (pillars)

2.44 m-12 pillars side span, 3.96 m-2

.

Bottom Width (-do-)

3.04m-12 pillar side span, 3.96m-2

Length

210.92 M

Height of barrage

11.79 M

Slope :Upstream

Down stream

3.HYDROLOGICAL FEATURES OF DAM

Catchments Area

Total 3048 sq.km,Free catchment 938 sq.km.

7079 cumecs

Probable Maximum Flood (PMF)

Method of Estimating PMF

4.SPILLWAY- VENT WAYS

Location

Type

Total Length

173.7 M

Crest Level

Central span-24.59m, side span-25.81

Design Capacity of spill way

7370cumecs

Number, type and size of gates

15nos. ventways provided with electrically operated framed steel shutters with vertical lifting arrangements Size of gates: 3nos. - 9.14*10.36m.12nos - 12.19m*9.14m

5.RESERVIOR FEATURES

Top Bank Level

36.43 M

Maximum Water Level

34.95 M

Full Reservoir Level

34.95 M

Minimum draw down level

Dead Storage Capacity

Gross storage capacity

169.79 mm3

Free board over F R L

1.48 M

Free board over M W L

1.48 M

Area of Reservoir at F R L

16.4 Sq.Km

6.HEAD SLUICE

Spill way

Spill Channel

Nil

Instrumentation

Nil