Pohangina

The Pohangina sub-catchment:

  • is 55,000ha in area,
  • land use is 51% sheep and beef, 46% forest (native and exotic), 2% dairy,
  • has a number of popular swimming spots,
  • contains significant wāhi tapu and customary fisheries throughout its length. It is of major significance to Rangitāne O Manawatū,
  • has six sites of rare/threatened native fish,
  • is an important trout fishery and spawning area,
  • contains 21 high priority bush and 1 high priority wetland sites, including the Tōtara Reserve, and
  • includes part of the Pohangina-Ōroua scheme.

The water quality of the Pohangina sub-catchment is characterised by high suspended sediment loads, and moderate-high phosphate and nitrate levels. Pathogen levels are generally safe for swimming. Sediment and nutrient levels are the result of non-point source run-off.

THE WATER QUALITY STATE IS EXPLAINED BY:

  • this sub-catchment contains approximately 19,000ha of unprotected erosion prone land (16% of the unprotected erosion prone land in the entire Manawatū Catchment) and is contributing 11% of the total suspended sediment load to the Manawatū Catchment,
  • there are 2 consented discharges to water in the sub-catchment, neither of which is considered significant,
  • there are 7 consented dairy shed effluent discharge consents, all of which are discharges to land. Inspections so far this season show 100% compliance in this sub-catchment, and
  • the exact level of progress towards the Dairying and Clean Stream Accord targets (around stock exclusion from waterways, stock crossing, and nutrient management) by dairy farmers in this sub-catchment is unknown, but there is extensive riparian fencing and stock crossings (bridges and culverts). Farmer surveys in the Manawatū-Whanganui region indicate the majority of Dairying and Clean Stream Accord targets are achieved.

IN ADDITION:

  • 4 man-made barriers are having a moderate to high impact on native fish migration,
  • public access to the Pohangina River is good,
  • only 5% of high priority bush remnants and no high priority wetlands are protected, and
  • the water quantity resource of the Pohangina sub-catchment is 32% allocated. All major takes are metered and automatically monitored.

 

 

REDUCE SEDIMENT RUNOFF FROM EROSION PRONE FARMLAND, THE RURAL ROAD NETWORK AND AREAS OF MAJOR EARTHWORKS THROUGH:

  • adoption of best practice management for earthworks
  • meeting resource consent conditions, compliance monitoring and enforcement
  • adoption of road maintenance and earthworks best practice management practices
  • continuation of Horizons Regional Council's Sustainable Land Use Initiative

REDUCE THE IMPACT OF FLOOD CONTROL AND DRAINAGE SCHEMES BY:

  • making greater use of plants on river banks
  • meeting resource consent conditions, compliance monitoring and enforcement
  • ensuring all works are undertaken in accordance with Codes of Practice

PREVENT OVER USE OF WATER BY:

  • ensuring metering of all major water takes
  • meeting resource consent conditions, compliance monitoring and enforcement
  • ensuring consented takes meet regional standards

REDUCE THE RUN-OFF OF SEDIMENT, NUTRIENTS AND BACTERIA FROM INTENSIVE LAND-USE SUCH AS DAIRYING AND CROPPING THROUGH:

  • adoption of Nutrient Management Plans and promotion of nutrient use efficiency
  • achieving the Dairying and Clean Streams Accord targets
  • meeting resource consent conditions, compliance monitoring and enforcement

PROTECT AREAS OF HABITAT FOR NATIVE FISH, BIRDS AND TROUT BY:

  • meeting resource consent conditions, compliance monitoring and enforcement
  • removing fish barriers
  • fencing and planting streams and bush/wetland areas, and pest control