Silverstream Bridges to Moonshine Bridge

This reach extends 4.2km between the Silverstream Bridges and the Moonshine The access road adjacent to the river is regularly inundated, leaving debris on the road park has a locked gate and the vehicle access road through the park is gently winding Bridge, and is characterised by its close proximity to the densely vegetated and and incurring costs to clear the debris away. The community has expectations that and undulating, with opportunities for vehicles to pull off and park under the trees.The undeveloped Wellington Fault escarpment. The escarpment and adjoining hills support debris will be cleared after each flood. Currently the section of the access road between river margins are densely planted, primarily with willows, but there are gaps in the areas of high-value indigenous forest remnants (Silverstream Scenic Reserve and 1520 and Silverstream Bridge is closed to the public. planting enabling good views of the river. Trentham Scenic Reserve) and regenerating forest, as well as exotic pine plantations. Several culverts run under SH2 and under the berm to discharge stormwater into the river. Opportunities These hills provide a dominant green and lush backdrop for river corridor users, devoid of buildings and roads. True Left Bank The close proximity of indigenous vegetation growing along the western escarpment offers the opportunity to enhance the ecological corridor across the river and the valley A groundwater influx into the river between the Whakatikei River confluence and Taita The land on the east side of the river is relatively undeveloped, with the adjoining land between the Wellington Fault escarpment and Belmont Hills to Barton’s Bush and Gorge results in a notable nitrogen gain in the river downstream of here. This increase including the Silverstream Golf Park, Royal Wellington Golf Club, Trentham Memorial beyond. Additional planting of indigenous vegetation will increase the biodiversity in nitrogen is believed to be a key driver of toxic algal blooms. Toxic algae can be Park (including Barton’s Bush and Domain Bush), Moehau Park and Moonshine Park. within this reach of the river corridor and continue the indigenous focus of the adjoining problematic in most reaches of the river in the summer, but they seem to be more UHCC manages Trentham Memorial Park, Moehau Park and Moonshine Park. Pomare/Silverstream reach. problematic between Barton’s Bush and Melling Bridge. The southern end of the berm is relatively narrow, with an easement required for the Parts of the western river berm are very damp, especially during winter. This is a True Right Bank river trail through the golf course land, which extends close to the river edge. North of potential location to establish wetland planting in place of mown grass, which in the long the golf course, Trentham Memorial Park and Barton’s Bush adjoin the river corridor. The river berm is narrow along this reach, being restricted between the river and SH2/ term could be developed into a lowland podocarp forest, a vegetation community that Barton’s Bush and Domain Bush are the largest remaining areas of lowland mixed- River Road. The road embankment forms the stopbank, with the road along its top. A was once dominant in the river floodplain. podocarp/broadleaf forest in the Hutt Valley. gravel vehicle track runs the length of the reach and accesses SH2 in several locations. Opportunities within the river corridor to reduce the incidence of toxic algae are limited These access points to SH2/River Road appear dangerous due to the steepness of The Moehau wetland and stream adjacent to Barton’s Bush, and Mawaihakona Stream given that the most effective remedies relate to catchment-wide runoff and nutrient their approach up the embankment, the lack of a formal crossing road formation and a (which passes through St Patrick’s College) cross the river floodplain and are both management, and summer water flows. lack of signage. There is one formal entrance and carpark near the Riverstone Terraces being restored by community groups that have cleared willow and other weeds and aim turn-off (chainage 1690). to restore the stream margins to lowland podocarp forest. Six stormwater outfalls discharge into the river within this reach. Willow plantings dominate the river edge, with the rest of the area open grass. Small North of Barton’s Bush, Moonshine Park occupies the berm between the stopbank and areas of indigenous plantings enclose the carpark area, and groves of poplar have the river. Moonshine Park is a popular and attractive open space. The open, grassed been established towards the northern end. The northern parts of the narrow berm areas are studded throughout with semi-mature totara and other tall trees that provide become wet in the winter. shade, shelter and enclosure, offering a multitude of picnic and play locations.The park is well serviced with a toilet block, picnic tables and play equipment for children. The

FUNDING/ # MMAP X SECTION ACTION EXPLANATION PRIORITY SUPPORT RESPONSIBILITY Focus: Enrich the ecological connections across the valley and along the river corridor. The hills on the western side of the river support high-ecological-value indigenous forest. Ongoing GWRC Toxic algae are most problematic between Barton’s Bush and Melling. Most problematic in the summer when the water is warm and river flows are reduced. GWRC's Ongoing GWRC monitoring and website alert system provides up-to-date advice to the public. 1 Enhance cross river ecology through focusing on planting of indigenous species. Focus on indigenous planting in berms on both sides of the river along the whole reach with a Ongoing GWRC view to providing year-round bird habitat and food sources. 2 Establish new wetland areas in the damper location on the west berm. Parts of the western river berm are very damp, especially during winter. This is a potential Medium GWRC location to establish wetland planting in place of grass, which in the long term could develop into lowland podocarp forest, a vegetation community that was once dominant in the river floodplain. Where practicable, plant river edge with native species to enhance fish habitat. Sections of the river margins, on the outside of river bends, are not planted and the river edge is Medium GWRC retained with riprap. These sections allow open views to the river and the opposite bank. In some of these areas it may be possible to establish low-growing riparian vegetation that will shade the river edge and maintain the open views (e.g. toi toi, Carex spp. and sedges – not flax because of the issues it creates for flood management). 3 Improve vehicle control on true right bank. Area becomes very wet in winter, attracting 4WD traffic along the berms. Rationalise vehicle use Medium GWRC and consider need for carparks, through traffic, and access to/from SH2. 4 Retain unplanted river margins where they exist. In places along the eastern river edge the river trail is close to the river and the riprap edge has Ongoing GWRC not been planted. These locations enable close contact with the river and should be retained. If planting is being considered, it should be confined to low-growing species, such as toi toi and sedges.

Te Awa Kairangi/Hutt River Environmental Strategy: Action Plan Te Awa Kairangi/Hutt River Environmental Strategy: Action Plan 41 ACTIONS – RIVER REACHES

Rock armouring along the river edge as opposed to dense stands of willows provides people using the river trail with open and unobstructed views of the river

Where practicable, plant river edge with native species to enhance fish habitat. Sections of the river margins, on the outside of river bends, are not planted and the river edge is Medium GWRC Trees planted in the river berm need to be well protected during the establishment period to Mature eucalyptus in Moonshine Park provide dappled shade and an ideal environment for Vehicle access up the road embankment to SH2 has poor visibility retained with riprap. These sections allow open views to the river and the opposite bank. In some avoid damage from vandalism and also from mowers picnickers of these areas it may be possible to establish low-growing riparian vegetation that will shade the river edge and maintain the open views (e.g. toi toi, Carex spp. and sedges – not flax because of the issues it creates for flood management). 3 Improve vehicle control on true right bank. Area becomes very wet in winter, attracting 4WD traffic along the berms. Rationalise vehicle use Medium GWRC and consider need for carparks, through traffic, and access to/from SH2. 4 Retain unplanted river margins where they exist. In places along the eastern river edge the river trail is close to the river and the riprap edge has Ongoing GWRC not been planted. These locations enable close contact with the river and should be retained. If planting is being considered, it should be confined to low-growing species, such as toi toi and sedges.

Te Awa Kairangi/Hutt River Environmental Strategy: Action Plan 42

Silverstream Bridges to Moonshine Bridge

The swimming hole under the Silverstream road bridge is a popular destination

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M o o n s h i n e ACTIONS – RIVER REACHES

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Te Awa Kairangi/Hutt River Environmental Strategy: Action Plan