Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search


Better ‘banking’, better water

Better ‘banking’, better water

By Bala Tikkisetty

Winter weather can place increased strain on the banks of farm waterways, increasing the risk of erosion from them affecting water quality.

So it’s timely to look at the issues involved in erosion generally and land management practices that can contribute to contamination of waterways.

Some of our Waikato rivers, lakes and streams have eroding banks, silted beds, water weed infestation and debatable water quality, often the result of sub-optimal land management practices.

Such practices – whether related to farming, forestry, roading or horticulture – can cause soil erosion and a build-up of contaminants such as bacteria and chemicals which end up being washed into watercourses during heavy rain.

Stock wading in water, poor cowshed effluent treatment, overgrazing, inappropriate fertiliser application, pugging and poor runoff control on cultivated land, roads and tracks can all contribute to the contamination of water bodies. Bacteria can cause water-borne diseases like giardia and cryptosporidium which in turn can cause serious health problems, while nitrates and phosphates can also create severe health disorders both for people and stock, and contribute to algal growth.

Good management of the banks of waterways can reduce these types of effects by stabilising the banks and providing a filter for contaminants washing off the land. Effective management of the banks – or riparian strips – is a key to protecting aquatic life and improving water quality generally.

Careful selection of the mix of species planted within riparian areas makes it possible to beneficially modify what’s happening with light, temperature, nutrient and sediment loads, channel and bank stability, carbon inputs, and habitat for terrestrial species.

A well-managed riparian margin will filter out contaminants, such as sediments and nutrients from farm run-off, including soil, animal dung and urine, and agricultural chemicals.

Shrubs and trees with extensive root systems, which tolerate moist soil conditions and frequent silt deposits, are ideal for stream bank erosion control. They physically hold the stream banks together and some tree roots also protect the streambed, limiting the scouring effect of running water.

Streamside vegetation provides shade which cools the water, improves dissolved oxygen levels, helps aquatic life and reduces the risk of algal blooms.

Suitable plant species beside waterways also provide cover for spawning fish, and food and habitat for nesting and juvenile birds. Such planting helps water plants and invertebrates become numerous, providing a better food supply for fish. Streamside trees can link areas of native vegetation together, extending habitat for native birds.

Besides environmental benefits, riparian planting can also help a farm’s economic bottom line.

Well designed riparian fencing can be used to improve subdivision, help with mustering, and protect animals from drowning or getting stuck in wet areas. The provision of shelter and shade is recognised as an important aspect of animal production and health.

Improved milk grades are documented where dairy sheds no longer draw water from contaminated streams. On sheep and beef properties, stock are in better health and have faster weight gain when water sources are no longer contaminated.

The council’s catchment management officers are available through our freephone 0800 800 401 to provide advice on good riparian management.

Bala Tikkisetty is a sustainable agriculture coordinator at Waikato Regional Council. Contact him on 0800 800401 or email bala.tikkisetty@waikatoregion.govt.nz


© Scoop Media

Parliament Headlines | Politics Headlines | Regional Headlines



Relevant Consents Gained: Government Unveils RMA Reform Package

The government has formally hauled down the flag on its attempts to alter the balance of environmental and economic priorities in the Resource Management Act, unveiling a 180-page Resource Legislation Amendment Bill containing reforms that have been largely endorsed by most political parties. More>>


Closing Schools And Such: Interim Redcliffs Decision Announced

“While the school’s board has argued that circumstances that could give rise to potential disruption are extremely unlikely, advice from technical experts has shown these concerns cannot be ruled out." More>>


Jane Kelsey: High Court Can’t Make Groser Provide TPPA Information Faster

‘This week we went back to court to challenge Trade Minister Groser’s stalling tactics over the release of information on the Trans-Pacific Partnership Agreement negotiations, following a High Court order that he reconsider the Official Information Act request I made last January’, said University of Auckland law professor Jane Kelsey, first applicant in the case. More>>

Werewolf 58: No Climate For Change

The last time the global community tried to take collective action on climate change the world’s leaders finally came to agree that every not-too-onerous effort should be made to hold global warming to 2°C above the pre-industrial average. At Paris, all 150 participant countries nations will have put forward their pledges... On the information available, New Zealand's is the second weakest contribution of any nation in the developed world. More>>


Lambton Quay Shutdown: Object Was Made To Look Like Bomb

Police cordoned off part of Lambton Quay Wednesday afternoon, saying that a suspicious package had been found. Buildings were evacuated and buses were detoured. The army’s explosive ordnance disposal unit was brought to the Quay. More>>


Public Sector Still Shrinking: Record Low Number Of 'Backroom Bureaucrats'

Ongoing restraint in the public sector and a focus on better frontline services has seen a further reduction in the number of core Government employees, State Services Minister Paula Bennett says. More>>


Disobeying The Law: Police Censorship Of Crime Research “An Outrage”

The Green Party is calling on Police Minister Michael Woodhouse to ensure Police scrap controversial contracts that place onerous restrictions on academic researchers’ access to Police data, the Green Party says. More>>


Get More From Scoop



Search Scoop  
Powered by Vodafone
NZ independent news