The Government have accorded Administrative Approval for SLBC Tunnel Scheme vide G.O.Ms.No. 147,I & CAD Dept., Dt. 11.08.2005 for Rs. 2813.00 crs to serve an ayacut 1.09 Lakh Ha (2.7 Lakhs acre).

Salient Features

Sl.No.	Details	Tunnel-I	Tunnel-II
1	Length of Tunnel	43,900 m	7,120m
2	Shape of Tunnel	Circular	Horse shoe
3	Finished Diameter	9.20 m	8.758 m
4	Tunnel length	43.90 kms	7.12 kms
5	Carrying capacity	113.28 cumecs(4000 cusecs)	113.28 cumecs(4000 cusecs)
6	Surface fall	1 in 3200	1 in 2870
7	Velocit	1.951 m/sec	2.03 m/sec
8	Concrete Lining	Precast segmental	Cast-in-Situ
9	Invert level at Tunnel entry	+251.351 m	+233.49 m
10	Exit level of Tunnel	+237.762 m	+230.965 m
11	F.R.L. Srisailam Reservoir	+269.75 m
12	Minimum drawdown level of Srisailam Reservoir for Head Regulator of SLBC	+260.3 m
13	FRL Dindi Balancing Reservoir	+245.00 m

Power required : 30 MW