Volume Two 21. Floodway Zone receiving water of more than 5 Munsell units or a decrease in clarity of more than 20% for more than 8 hours in any 24 hour period and more than 40 hours in total in any calendar month. 21.3.7. Land disturbance works to facilitate the diversion of water. 21.3.7.1. The works must only be carried out working in an upstream direction. 21.3.7.2. Redundant channels must be left open at the downstream end in a manner that ensures that fish stocks are not entrapped. 21.3.7.3. The full length of a redundant channel must be surveyed for stranded fish. Any stranded fish found must be relocated to the same river immediately upstream of the diversion. 21.3.7.4. The Nelson Marlborough Fish and Game Council and the Department of Conservation must be informed of the proposed works at least 5 working days prior to the works commencing. 21.3.7.5. The diversion must be necessary for maintaining the stability of the riverbank in the vicinity, or for facilitating the removal of gravel or sediment for river control purposes. 21.3.7.6. Any discharge of sediment into water associated with the land disturbance works must not, after reasonable mixing, cause a change in colour of the receiving waters of more than 5 Munsell units or a decrease in clarity of more than 20% for more than 8 hours in any 24 hour period and more than 40 hours in total in any calendar month. 21.3.8. Gravel and sediment removal within a dry part of a riverbed. 21.3.8.1. Gravel and sediment must be extracted in strips and layers from the inside of bends, working from the water’s edge towards the land and with a perceptible slope rising away from the water edge, alternatively, a buffer strip of 1m width must be left between the water’s edge and the start of excavation. 21.3.8.2. The removal must not disturb flowing water. 21.3.8.3. Any removal must take place from the downstream end of the gravel beach, working upstream. 21.3.8.4. No secondary braid or flow pattern must be opened up during the removal operation. 21.3.8.5. A vertical face of an area of gravel removal must not exceed one metre in height. 21.3.8.6. Gravel must not be stockpiled within the active riverbed for a period exceeding 24 hours. 21.3.8.7. Oversize boulders or other sediment excavated must be removed from the riverbed. 21.3.8.8. Access across the Wairau floodway bars for gravel extraction is not permitted from Boyces Road, Pauls Road, Giffords Road, Cravens Road, Hillocks Road or State Highway 1 (North Bank). 21.3.8.9. An access route to a removal point must not cross or cut off flow into a minor channel or backwater, not adversely affect riparian vegetation or not disturb native birds using riparian vegetation for nesting. 21.3.8.10. The removal of gravel must be limited to the hours of 7.30 am - 5.00 pm from Monday to Saturday (inclusive). No gravel must be removed on a public holiday or between 24 December and 3 January (inclusive). 21 – 5