A discussion on the issue of salinity

soil salinity effects on agriculture

The capacity of a drainage system should be based on the amount and frequency of heavy rains. Other subsurface drains: These include any type of buried conduit with open joints or perforations that collect and convey excess water from the soil. This can have a significant impact on council planning activities and can restrict funding available for other essential services provided by councils.

A river draining a particular soil type, however, may bring to the oceans only certain salts that will locally alter the salt composition.

This results in dehydration of the plant, causing yield decline or even death of the plant.

Soil salinity problems

The range of salinity observed in the open ocean is from 33 to 37 grams of salt per kilogram of seawater or psu. It is anticipated that this situation will present local government with a significant and unfunded problem in the not-to-distant future. Whilst I agree that we need professional people, we also need to be able to get that simple message across to people. WSROC is particularly concerned about that issue because of the previous environmental issues for that area. Building codes 6. Because many salts are also plant nutrients, high salt levels in the soil can upset the nutrient balance in the plant or interfere with the uptake of some nutrients Blaylock et al. The spread of dry land salinity can be contained by reducing the amount of water passing beyond the roots. We are very concerned that it is a major problem in the Western Sydney area—or a potential problem. Mrs Sharon Fingland from WSROC claimed that the issue of urban salinity was so large that it required all levels of government to be involved as planned urban development often occurs with little regard of possible effects: Sometimes some of the decisions that are made at that level actually have consequences at the lower level, which we would argue are not always taken into account. Water quality The most significant off-site impact of dryland salinity is the salinisation of previously fresh rivers. Often it is more economic to replace the entire plugged section.

Mr Forbes from the Department of Environment and Heritage told the Committee: Local governments, clearly, are very interested in some of the infrastructure questions, and I think local governments can actually learn a great deal from the regional construct and planning which has gone into the regional investment strategies and the underpinning work which has gone into creating those regional plans.

There was an identified need to try to improve the connectivity there and provide technical support to both the NRM regions and the local governments so that, over time, they can better incorporate those NRM considerations into their local planning strategies and town planning schemes.

It addresses things like the size of lawns, which is the landscaping side of it. A natural grade or fall is needed to carry the water away from the area to be drained. Good quality clay tiles have been found to last indefinitely in the soil.

How do humans cause salinity

Eleven booklets have been produced in the LGSI series, which bring together a range of information on urban salinity management. We told people that we had four programs that we were going to put in place, which we were hopeful could manage the rising water tables under the urban area. While criticisms were levelled at some local governments, the Committee heard evidence that many local governments are actively engaged with the issue of urban salinity. This water then returns to the ocean as superheated water carrying dissolved salts from the magmatic material within the crust. This was a salinity alleviation project that has had great biodiversity consequences. Plants absorb essential nutrients in the form of soluble salts, but excessive accumulation strongly suppresses the plant growth. The major growth centre that they are proposing in the Bringelly area in the south-west of Sydney will impact on the other part of the South Creek catchment. As in other situations, capillary action will assist to draw the salt-laden water to the surface. The impacts of salinity include—low agricultural productivity, low economic returns and soil erosions, Hu and Schmidhalter, However the water intake rates of soils should be kept as high as possible so that water which could be stored will not be drained off.

These costs will impact on local government, domestic households, commercial and industrial businesses, state government agencies and public utilities. Irrigated agriculture can be sustained by better irrigation practices such as adoption of partial root zone drying methodology, and drip or micro-jet irrigation to optimize use of water.

A discussion on the issue of salinity

The South West Catchments Council and the Swan Catchment Council have two projects, the Perth Biodiversity Project, and now the South West Biodiversity Project, which is looking at building the capacity of local governments in relation to their natural area management and having a strategy for how they reflect that in town planning schemes and their rezoning of some land In Wagga Wagga the Committee heard that the City Council has worked with the NSW State Government to develop salinity planning maps: In essence, prior to the CMA the government department of the day assisted Wagga City Council to develop a land and water management plan, and all those sensitive areas have been mapped.

Urban salinity has significant costs for both councils and their communities, in terms of salt affected infrastructure such as roads, housing and drainage

irrigation salinity
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