Preamble

The existing Thotapalli Regulator on River Nagavali was constructed in the year 1908. The Govt. of Andhra Pradesh have accorded Revised administrative approval for Rs 774.90 Cr vide G.O Ms No 78, I & CAD PW - M&MI CA.I(2) Dept, Dated 05-11-2012 for construction of Thotapalli Barrage Project to provide additional irrigation facilities to new ayacut of 1,35,000 Acres(136191) including 15,000 Acs of Gajapathinagaram Branch Canal under the project (9300+47,958+15,000 =72,258 Acres in Vizianagaram District, 13 Mandals & 63933 Acres in Srikakulam District,7 Mandals) besides stabilizing existing ayacut of 64,000 Acres (8715 Acres in Vizianagaram District & 55285 Acres in Srikakulam District) under Thotapalli regulator and providing drinking water supply to 24 Villages en route of the canal by feeding 42 Nos. of tanks.

Salient features:

Source	:	River Nagavali (Langulya)
Location	:	Thotapalli(v), Garugubilli (M),Vizianagaram District
Catchment area	:	4455 sqkm.
Latitude	:	18° 47' 30'' N
Longitude	:	83° 25' 24'' E
Total available yield from catchment area	:	44.000 TMC.
Yield allocated for Andhra Pradesh as per Inter state Agreement	:	16.000 TMC
Proposed yield to be utilised in this Thotapalli Barrage Scheme	:	15.895 TMC
Storage capacity of Barrage at FRL/MWL (+105.00 Mts)	:	2.509 TMC (71.05 M.Cum)
C.C.A. Under this Project	:	1,84,000 Acers
Existing Ayacut (Khariff Paddy)	:	64,000 Acres
Proposed additional Ayacut (Ground nut in Khariff)	:	1,20,000 Acres
Spillway
Type of spillway	:	Ogee
Total length	:	117 Mts
No.of Radial Gates	:	8 No.s
Size of vent	:	12.00Mts x 7.00Mts
Crest level	:	+98.00Mts
Designed Discharge	:	3234Cumecs
Foundation level	:	+87.50Mts
Earth Dam
Total Length	:	8.20Km (Both sides)
Top width	:	6.00Mts
Maximum height	:	20.20Mts (R/S Earth Dam)
F.R.L/M.W.L	:	+105.00Mts
T.B.L	:	+109.00Mts
M.D.D.L.	:	+100.00Mts
Left Head Sluice
Sill level	:	+97.00 Mts
No.of vents	:	2 No.s (Size 2.00Mx2.25M)
Right Head Sluice
Sill level	:	+97.40 Mts
No.of vents	:	2 No.s (Size 4.30Mx2.50M)
Discharge	:	34.23 Cumecs
Length of Right Main Canal	:	107.00 Kms