POTHUNDY IRRIGATION PROJECT



Salient features

1.General

State

Kerala

District

Palakkad

Taluk/ Village

Chittur

Latitude

100 32.5rsquo;N

Longitude

700 36.5quot; E

River

Ayilur (Tributary of Bharathapuzha )

2.Structural features of dam

Type

Homogenous earth dam

Top width

7.32 m

Bottom width

133.8 m

Length

1680 m

Maximum height from bed level

32.61 m

Slope - upstream amp; downstream

2:1, 2:1

3.Hydrological Features of dam

Catchment Area

31 sq.kms

Probable Maximum Flood

680 cumecs

Method of estimating PMF

Current Meter Method

4.Spillway

Location

Right flank of dam

Type

Gravity Type with ogee curve

Total length

40 m

Crest level

+104.09 m

Design capacity of spillway

682.44 cumecs

Number, Type, amp; Size of gates

3, (12.19X 4.11), Level shutters

5.Reservoir Features

Top bank level

+110.642 m

Maximum water level

+108.204 m

Full reservoir level

+108.204 m

Minimum draw down level

+91.44 m

Dead storage capacity

7.014 Mm3

Gross storage capacity

50.914 Mm3

Freeboard over FRL

2.42 m

Area of reservoir at FRL

2.75 sq.kms

6.Head sluice

Sillevel

+91.44m

7.Spill Channel

Artificial river existing for carrying discharges of spillway