General Fund 2024-2025

Drilling of Borewells anywhere in Tamilnadu including transportation from one place to another with in Tamilnadu in alluvial soil sedimentary strata of clay and sand stone shale pebbles boulders etc. By first taking a pilot bore of 150 mm/200mm dia and then enlarging to required dia direct or reverse rotary mud circulation method using rotary rigs fuel, labour and drilling bentonite and water required for drilling at site. Site will be shown by the TWAD Board officers including construction of mud pit.

Upto 60 mt. Depth ending below ground level

From 60 m upto 90 m Depth ending from ground level

From 90 m upto 120 m Depth ending from ground level

From 120m to 150m Depth ending from ground level

From 150m to 180m Depth ending from ground level

From 180m to210m Depth ending from ground level

From 210m to240m Depth ending from ground level

Reaming 200 mm dia pilot bore to 350mm dia bore as directed by the Departmental Officer

Upto 60 mt. Depth ending below ground level Sl.No 12 b - i

60 mt.to 90 m Depth ending below ground level Sl.No 12 A - i

90 mt.to 120 m Depth ending below ground level Sl.No 12 A - i

120 mt.to 150 m Depth ending below ground level Sl.No 12 A - i

From 150m to 180m Depth ending from ground level

From 180m to210m Depth ending from ground level

From 210m to240m Depth ending from ground level

Supply of the following casing pipes of ISI approved quality with wall thickness not less than 7.5mm to 8.5mm with PVC couplers and cement Paste etc. Complete and including packing the annular space with pebbles quality and size of pebbles and the PVC pipe should be approved by the departmental officer.

200mm dia OD PVC Plain casing Pipe (CM)

200mm dia OD PVC slot casing Pipe (RS)

200mm dia OD PVC end cap

Labour Charges for inserting PVC Casing pipes assembly (with slots or without slots) in the drilled hole including jointing the pipes with PVC Couplers with Cement paste etc., complete supply and packing the annular space with pebbles of size and quality as approved by the executive engineers

Charges for developing the borewell with air compressor of 600 cfm capacity (Minimum 8 Hours) including transportation labour and fuel charges for compressor as directed by TWAD Board officers and conducting yield test by 'V' notch method. TWAD Board SL.NO 13B