* Introduction InfraGeo Silt Fence is specially designed for the purpose of environmental preservation and protection of ocean resources by preventing diffusion of pollution originated from dredging or reclamation works. * Structure 1) Float Part ① Assembled Type - Consisting of two semicircular polystyrene foams inside polyethylene covers. ② Single Body Type - Consisting of circular polystyrene foams covered by tarpaulin sheets. 2) Canvas Part : High tenacity polyester woven fabric which maintains a good filtration and durability. 3) Connection Part : Consists of some accessories to connect between canvas part and anchor blocks. * Design of Silt Fence Determination of a proper canvas based on the external conditions of the site. 1) Calculation of the external force ρ x C0 x V2 P = ---------------- COS2Q 2g where, P : External force ( kg/cm3) C0 :Coefficient of resistance g : Acceleration of gravity ( m/sec2) ρ: Density of the sea and the air (kg/m3) V : Velocity of the wave, the wind and the ocean current (m/sec) Q : Influx angle of the wave, the wind and the ocean current 2) Calculation of the canvas tension P0 X a T = -------- 2 x f where, T : Canvas tension (kg/m) 2a : Interval of each anchor (m) P0 : Resultant force for external forces (kg/m2) f : Variation (m) * Installation Method of Silt Fence 1) Preparation Mark the proper places after consideration of the site such as ocean current direction and velocity from silts occuring area. 2) Placement of anchor blocks Place the main(sub) anchor blocks at intervals of ten( five)meters. The weight of anchor blocks should be over than the total load of canvas external - forced. 3) Towing and installation of silt fence Tow the silt protector to the site and then install it at the designated place by using a small tug boat. And connect the anchor blocks and the silt fence with wire ropes.