Kerala Rural Water Supply And Sanitation Agency Tender

Construction of rain water harvesting unit

Construction of rain water harvesting unit using ferrocement tank of capacity 10000 litres , as per the approved drawing, by constructing foundation with Random Rubble Masonry in cement mortar 1:6 over a levelling course of PCC 1:4:8 using 40mm broken stone 100 mm thick , Plinth portion plastered with 12mm thick CM 1:3, filling the basement with dry rubble packing to the required curved shape at top , placing the scour pipe suitably , providing 75mm thick PCC 1:2:4 using 20 mm broken stone to the required curved shape at the top of foundation /basement , over which constructing a Ferro cement tank of capacity 10000 litres of 3.00 m diameter and 1.50m height using 6mm M.S bars for belt , haunch , hoop , diagonal and circular for bottom, sides and dome , one layer 12 gauge weld mesh 50mmx50mm size & 12 x 24 gauge chicken mesh ( 2 layer) for bottom , sides & dome , 60cmx60cm man hole and cover at the dome , inlet chamber with filter and gratings , plastering the tank with cement mortar 1:2.5 , 12 mm thick finished with neat cement flushing coat inside and outside, having an average wall thickness of 24mm, white washing two coats to the exposed surface, providing half split 160 mm diameter gutter pipe class 2 PVC (minimum length 10.00m) , down pipe & inlet pipe with 75mm class 2 PVC pipe , scour and over flow pipe with 50mm class 2 PVC pipe , 75 mm PVC valve for down pipe, 50 mm PVC valve for scour pipe , 20mm GI out let pipe with 15mm SDB tap. Earth work excavation for recharge pit of size 1.00mx1.00mx1.00m refilled with rubble , brickbats, stone etc to collect water from overflow pipe ,(if open well available within a distance of 15m the over flow is to be connected to the well), Providing 32mm GI (M) pipe of suitable length with MS saddle piece welded to one end of the pipe so as to support 75 mm PVC pipe (inlet pipe) wherever necessary , welding MS bars at the other end to have proper anchorage and fixing the pipe with CC 1:2:4 etc including all cost and conveyance of materials and labour charges to the full finished work in all respects including Labelling-“KRWSA - RWH Tank - 10000Litres Capacity