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.
- 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.