Wairau/Awatere Resource Management Plan 5.4 Wairau (Tuamarina to Waihopai Confluence) 5.4.1 Design Intentions 5.4.1.1 Encourage commercial gravel extraction from the river channel in locations that will be of most benefit to maintaining channel waterway capacity, and/or to achieve a desirable river channel alignment. 5.4.1.2 Maintain a cleared active channel of typically 380 metres by removal of vegetation, on a defined slightly sinuous meander pattern. 5.4.1.3 Provide and maintain bank edge protection for this active channel by means of rock lined training banks on the outside of bends of the defined meander pattern; willow and poplar tree planting on the inside of the bends strengthened by rail iron retards, and as necessary strengthened by isolated rock work. 5.4.1.4 Upstream of Conders groyne where a defined meander pattern cannot be held, to build and maintain rock headed cross banks on the south bank to constrain the active channel. 5.4.1.5 To raise low stopbanks on the south bank between Selmes Road and Giffords Road. 5.4.1.6 To strengthen and raise the training banks in Barnetts area that guide Wairau flood waters away from the Tuamarina village area stopbanks. 5.4.1.7 To raise three low open ended Northbank stopbanks. 5.4.1.8 To strengthen stopbanks identified as prone to piping failure at Hillocks Road and possibly other sites. 5.4.1.9 To complete stopbanking on the south bank by erecting new stopbanking to join the lower Conders and upper Conders stopbanks. 5.4.1.10 To raise and relocate the low stopbank in the lower Conders area and also raise upper Conders stopbank, that to date have been left low until works downstream have been brought to an adequate standard. 5.4.1.11 Improve the hydraulic efficiency of the berms by partial removal of spur banks and guide banks, while leaving enough banking to counter potential stopbank erosion. 5.4.1.12 Maintaining a controlled blend of appropriate trees and vegetation on the berms to achieve good hydraulic efficiency while leaving sufficient vegetation to inhibit scour and erosion. 5.4.1.13 To carry out berm shaping works to inhibit potential channel forming erosion on the berms and promote a slope from the stopbank towards the channel edge. 5.4.2 New Works Required • Strategic gravel and sediment removal. • Extension of the 12 rock lined training banks upstream and downstream as required. • Lowering and partial removal of the ends of guide banks and spurs within the floodway; on the north bank opposite Giffords and Selmes Road; and on the south bank at McLauchlans, Wratts Road, Jeffries Road, near Selmes Road and near Cravens Road. • Raising stopbanks on the south bank upstream of Selmes Road. App F - 4