Irrigation Department Tender

Putting up cross bund (Salinity barrier)

OD21530/2024-2025:Forming bund to a width of 1.5 m and 3 m (av) height and protecting the sides with 1/2 split well matured and sound coconut post 5 m long driving down 2 m below ground level on both sides at 75 cm c/c, providing 2 rows of weiling pieces 1/4 split coconut post on both sides and tying with 1/4 split coconut cross ties at 2.0 m c/c connecting the alternate set of post , and screening the sides of bund with separation membrane of impermeable plastic sheet 125 micron thick fixed properly using coconut post and weiling pieces reeper and nails in full height including tying properly using iron wire and coir altogether and supplying and filling inside with cut earth upto 3.0 m, level and conveyed with all leads and lifts including consolidating properly and maintaining the bund properly through out the cultivation period including cutting and removing materials and clearing area etc complete as per the direction by the departmental officers at site. Width = 1.5 m , Height = 3 m Length of coconut pile = 3 m Spacing = 0.75 m c/c Length of 1/2 split coconut pile required for 10 m = (10/0.75+1)x2 = 28 Nos x 5 m =140 m Length of 1/4 Split coconut pieces for weiling pieces for 10 m = 2 x 2 = 4 Nos x 10 m = 40 m Length of 1/4 Split coconut pieces for cross ties = 10/2+1 = 6 Nos 2 x1.5 = 18 m Plastic medium sheet = 10.30x1.5x3 = 46.35 sqm Cost of 1/2 split coconut post (Details vide 60.64.2), Coconut post required for 1 m =140/10 = 14 m (average length of coconut pile 6 m and dia 25 cm ) Assuming coconut post can be used 2 times No of Coconut pile required for 1 m = 14/6 = 2.33 No.s Carriage of timber = 2.33 x 6 x 3.14 x.125x.125 = 0.685 cum 58/10= 5.8 m Total No of Coconut piles 1/ 2 split for 10 m length @ 1.0 m c/c = 10/0.75+1 = 14 Nos. on both sides = 14 x 2 =28 Nos for 1 m length - 28/10 = 2.8 No.s. Pile Driving down length = 2 m, Total length= 2 x 2.8 = 5.6 m Screening the frame with medium quality plastic sheet nailed to wailing pieces and coconut post, Sheet required = 10.3 x 1.5x 3 = 46.35 sqm, For 1 m = 46.35/10 = 4.635 sqm Quantity of earth =1.5 x 3 = 4.5 cum