Thread by @jamewils

#KSEBL Reservoirs Statistics in the backdrop of probability of cyclogenesis in Arabian Sea.

KSEBL own 59 dams.

Out of which only 33 numbers are qualified as large dams, rest are diversion structures for augmentation.

We have only 18 reservoirs formed under above dams.

The combined live storage capacity of these 18 reservoirs is 3532.47 MCM.

The biggest reservoir is Idukki with 1460 MCM and the smallest one is Sengulam with 0.39 MCM.

The above 18 reservoirs are divided based on storage capacity as follows:

Major ones (5 Nos.) - Idukki, Idamalayar, Kakki, Banasurasagar and Sholayar (92.3% of total capacity)

Medium ones (6 Nos.) - Madupetty, Anayirankal, Ponmudi, Kuttiyadi, Pamba & Poringalkuthu (7% of total)

Minor reservoirs (7 nos.)- Kundala, Kallarkutty, Lower Periyar, Moozhiyar, Kallar, Erattayar and Sengulam (0.7% of total capacity.

Today all these 18 reservoirs together hold 1130.55 MCM, ie, 32% of their total capacity

There are enough rooms in all major 5 reservoirs.

The live storage position as of today is as follows:

Idukki - 475.799 MCM (32.6%)
Idamalayar - 304.440 MCM (29.91%)
Kakki - 193.650 MCM (43.37%)
Banasurasagar - 19.550 MCM (10.54%)
Sholayar - 45.53 MCM (30.34%)

As far as medium reservoirs are concerned

Madupetty - 31.94%
Anayirankal - 7.82% (unregulated one)
Ponmudi - 79.61%
Kuttiyadi - 46.59%
Pamba - 0.90%
Poringalkuthu - 25.48% (shutters kept in open position)

We are monitoring Ponmudi, Poringalkuthu & Kuttiyadi closely.

As far as minor reservoirs are concerned, Kundala has 8.77% storage and no chance of spill.

Rest are receiving cascading flow from upstream powerhouses & they have no holding capacity. So if they fill with rains, shutters will be opened after all observing all formalities.

It is important to understand that the spillway are provided to manage the excess inflow coming to the reservoir.

A reservoir is formed with multiple dams. Example Idukki reservoir is having Idukki Arch Dam, Cheruthoni Dam & Kulamavu dam.

The spillway is given in Cheruthoni

Banasurasagar reservoir in Wayanad is formed with 8 dams and it is also having only one spillway.

As far as Sengulam & Anayirankal reservoirs are concerned, they have no gates and spill water will freely flow once it reach FRL.

At present Poringalkuthu reservoirs gates are kept in open position and that reservoir is also function as an ungated one.

So at present, 15 reservoirs are having a regulated spillways, which can be open to discharge water.

So don't confuse them with number of dams.