Materials * Silt curtain fabric: manufactured from a woven geotextile, canvas/tarp material, or a commercially available silt curtain such as nylon reinforced polyvinyl chloride (PVC) or equivalent. * Ballast chain: 10 to 13mm galvanised chain with minimum 1.9 to 3.3kg/m weight. * Land anchor: minimum 100mm diameter timber post (or equivalent). * Marine anchor: minimum 5kg lightweight (Danforth) type anchor with 10 to 13mm nylon tie rope and minimum 3m length of 8mm galvanised connecting chain. Installation Installation procedures should be provided by the product manufacturer or distributor. A typical installation procedure is described below, but should be confirmed with the product manufacturer or distributor. 1. Prior to commencing any works, obtain all necessary approvals and permits required to conduct the necessary works including permits for the disturbance of riparian and aquatic vegetation, and the construction of all permanent or temporary instream barriers and instream sediment control measures. 2. Prior to the installation, check weather reports for a suitable windless, calm day. Do not proceed with the installation unless safe to do so. 3. Refer to approved plans for location and dimensional details. If there are questions or problems with the location, dimensions or method of installation contact the engineer or responsible on-site officer for assistance. 4. Clear the immediate launching area of rock and debris. Avoid disturbing groundcover vegetation. 5. Layout a plastic launching pad (spillway) at right angles to the watercourse bank and peg or anchor it down. This is to protect the curtain and reduce friction when launching. 6. Unfold the curtain in an open area prior to its installation. Ensure the barrier is fabricated with sufficient dimensions to be in good contact with the bottom of the channel. The depth of the barrier should be approximately 10% greater than the water depth to ensure it rests on the bed. 7. Ideally, the length of the barrier is 10 to 20% longer than the measured length of the proposed enclosure. 8. Unfold the first curtain panel on the slipway. 9. Insert the floats both ends for ease of installation. 10. Pull through the steel chain in the bottom sleeve using the draw cord. 11. Pull through the rope using the draw cord. 12. Prior to deploying the barrier, gather up the curtain and tie the curtain with lightweight straps or rope every 1 to 1.5m. The aim of this is to enable the curtain to be set in place in the water easily without the curtain being dragged along the channel bed. 13. Set the upstream bank anchor point and tie off one end of the barrier, ensuring no water will be able to flow into the upstream end. 14. Deploy the barrier from the end of a boat. Fasten the free end of the barrier to the downstream anchor point, then anchor the barrier at intermediate points. 15. Taper the ends of the barrier to the shape of the shoreline, otherwise tie the ends of the barrier with furling straps so the depth of the barrier can be adjusted to the shape of the bank. 16. After the barrier has been anchored, check to see that the skirt is not twisted around the flotation units. When the barrier is properly deployed, cut the tie ropes and let the ballast weights sink to the bed. 17. Ensure the skirt (at maximum water level) is free of large pleats that may collect sediment causing the barrier to be pulled under the water surface. Alternative land-based installation procedure: 1. Unfold the first curtain panel on the slipway. 2. Insert the floats both ends for ease of installation. 3. Pull through the steel chain in the bottom sleeve using the draw cord. 4. Pull through the rope using the draw cord. 5. Prior to deploying the barrier, gather up the curtain and tie the curtain with lightweight straps or rope every 1 to 1.5m. The aim of this is to enable the curtain to be set in place in the water easily without the weights being dragged along the bottom. 6. Set the upstream bank anchor point and tie off one end of the barrier, ensuring no water will be able to flow into the upstream end. 7. Install an extra length of rope or cable in the final curtain position in the water. 8. Tie the end of the curtain rope to the extra length already in position and pull the curtain into the water stopping when the end of the first section of curtain is still on the bank. 9. Unfold the second section of curtain on the slipway making sure the curtain is correctly orientated with the first section of curtain 10. Insert the floats, chain and rope as before. 11. Using the draw cord from the first section, tie up the ends using the eyelets already in the curtain. 12. Gather up the curtain and tie together with twine or thin rope. 13. Launch as before. 14. Continue until the entire curtain is installed. 15. Anchor well to shore anchors. 16. Using a suitable boat, move along the curtain and cut the ties holding the chain and curtain and allow the weighted end to sink. 17. Ensure the skirt (at maximum water level) is free of large pleats that may collect sediment causing the barrier to be pulled under the water surface. Maintenance 1. Inspect the silt curtain daily for damage. 2. Ensure the top of the barrier remains above the water surface, and the curtain is free of tears or gaps. 3. Ensure the barrier remains in the specified location. 4. Check for turbidity leaks. 5. Check all anchor points. 6. Repair or replace any torn segments. 7. Check for sediment build-up on the bottom of the skirt that may begin to pull the curtain under the water. 8. Dispose of any excessive sediment or debris deposits in a manner that will not create an erosion or pollution hazard. 9. Repair any places in the isolation barrier that have weakened or that have been subjected to damage from inflows or overtopping water. Removal 1. The silt curtain should be removed as soon as possible after it is no longer needed. 2. If excessive sediment or debris has collected around the barrier, then remove such material before the barrier is removed and dispose of such material properly. 3. Ensure the channel water contained within the enclosure has achieved a suitable water quality before removing the silt curtain. 4. Ensure the release of sediment and the damage to the channel's bed and banks is minimised during removal of the silt curtain. 5. If it is not feasible to wait for adequate settlement of suspended sediments, then where practicable, pump the sediment-laden water to an off-stream de-watering sediment control system for treatment. This treatment area should ideally be located at least 50m from the channel. 6. Remove all construction materials, excessive sediment deposits and debris and dispose of in a suitable manner that will not cause an erosion or pollution hazard. 7. Restore the watercourse channel to its original cross-section, and smooth and appropriately stabilise and/or revegetate all disturbed areas.