| ENVIRONMENTAL ISSUES |
POSSIBLE SOLUTIONS |
| Water extraction |
| Water extraction |
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| Bore water quality |
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| Need to maintain flows in Marbellup Brook |
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| Nutrients |
| Nutrient runoff into waterways |
- Trial application of zeolites along riparian corridors
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| Water quality not appropriate for irrigating natives/wildflower due to high nutrient levels |
- New farming practices eg. use of Allrock
- Increase micro-organisms in the soil
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| Fertiliser use - need to apply to get pasture growth - don't want to be stopped from applying fertiliser |
- Apply minimum - soon after season breaks eg. 90lb/acre for hay, 60lb/acre for pasture
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| Finger being pointed to piggeries/dairies etc. BUT this is an agricultural catchment where nutrients are a critical input. These industries provide employment and economic income |
- Test nutrients coming off specific land uses
- Test amount of nutrients used by pasture species eg. kikuyu
- Provide information to landholders on best practice nutrient reduction and improving productivity
- Subsidies to implement best management practices
- Demonstration sites targeted to new practices
- Claying sandy soils
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| Nutrient loss from farmland and low Fe soils |
- Education, soil testing, perennials
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| Accurate information to target hotspots not available |
- Make information accessible to the public and promote discussion
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| High nutrient levels in waterbodies eg. pool in waterways with high N levels |
- Trial zeolite application to take out N from water column
- Will allow slow release for plant use. Macrophytes (eg. pond biofilter) will use N off the zeolite. Zeolite flocculant into water, then add microbes to break down algae blooms
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| Horticulture around lake Powell |
- Protect existing trees by fencing
- Paperbarks
- Industry guidelines
- Compliance
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| Point sources |
- Stream restoration and revegetation (don't use wire tree guards)
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| Alternative lifestyle people moving into the catchment - additional effluent from small blocks |
- Controls/planning guidelines for sub-division in Elleker - city rural planning strategy
- Self contained on-site effluent systems
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| Stocking rates influences by finance |
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| Drainage system |
| Management of lower drainage district - nutrients and water levels and volumes affect a range of issues |
- Develop a management plan including how the new plan differs from the current management
- Redesign the three levels of drainage
- Dredging
- Open Lake Manarup back into the system
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| Pressure to maintain drainage due to urban encroachment |
- Purchase properties in low lying areas and remove plugs to re-instate free flow toward more natural flow system
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| Deep drains |
- Restore back to creeks eg. Unndiup Creek
- Reinstall ponds, meanders, replant wetlands to reduce algae
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| Water quality of North Creek drain bridge, siltation, nutrients |
- Reduce algal blooms
- Flushing to increase the flow
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| Drainage system delivering water too fast - nutrients get into drains too quickly |
- Education and awareness
- Sluice gates/flow control structures
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| Drainage management |
- Drainage design - wetlands, rehabilitate swamps, straight in some places and meandering in others, use natural swamps where possible
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| Weeds and ferals |
| Blackberries on watercourses and other weeds |
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| Weeds - watsonia, taylorina |
- Two way action needed to delete weeds but replant with suitable native vegetation
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| Weeds |
- Map weed infestations and develop weed management program
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| Taylorina, weed invasion in fenced areas, blackberries. Watsonia spreading, burning increases watsonia growth.
Wild cherry (tree) is spreading via birds through the bush |
- Water Corporation sprays watsonia along water reserves
- Important to revegetate with natives after weed control
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| Weeds - watsonia, taylorina, blackberry, arum lilly |
- Map weed hotspots
- Appropriate management program
- environmentally friendly
- on going vigilance
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| Council roadside drain management is spreading weeds |
- Education about proper disposal of overburden
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| Foxes especially in bluegums, emus |
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| More foxes, rabbits with bluegum plantations they provide habitat for vermin |
- Vermin control or less plantations
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| Vermin - foxes, rabbits, cats |
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| Foxes especially on shire land, cats, domestic ducks |
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| Chemicals |
| Chemical wash-off from bluegums |
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| Chemical sprays from bluegums - effect of overspray on waterways and aquaculture |
- Waterways and aquaculture etc. need protection from sprays
- We need more information about the damage sprays do to waterways, effect of the sprays on the operators, children, neighbours, animals and how plantations are sprayed
- Also chemical levels in beef cattle
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| Algae |
| Smell off Lake Powell (also public health issue) |
- Reduce nutrient inputs
- Phoslock treatment
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| Lake Powell - nutrients, smells, algae, impact on environment |
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| Nutrients into lakes and inlet |
- Compare anecdotal evidence with scientific information particularly information from more than 50 years ago
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| Reduced water levels in Lake Powell - reduced flushing and increased blooms |
- Dredge out Lake Powell and Manarup to provide more compensating capacity
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| Bar opening |
| Bar opening impact on whiting and other marine species - influx of cold water |
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| Bar opening - impact on blooms |
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| Bar openings for potato farms |
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| Fish stocks |
| Trout in creeks preying on marron |
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| Water quality at Inlet mouth ruins fishing - can't eat the catch |
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| Fish numbers and species not like they used to be - don't catch Murray cod any more |
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| Nutrient discharge to the ocean - environmental and industry effects |
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| Laws/regulations re nutrient pollution need to be stronger |
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| Lake Manarup was let to dry this year (breeding area for mullet) |
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| Waterways |
| Instability of creek banks |
- Fence all creeks - should be heavily subsidised especially labour
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| Erosion on watercourses and banks |
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| Riparian degradation |
- Target most degraded riparian areas and provide incentives to restore these areas
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| Lack of information about what goes into creeks |
- Monitoring of creeklines with information updated regularly
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| General water quality of creeks |
- Eliminate aerial spraying
- Fence all creeks - should be heavily subsidised especially labour
- Zeolite and microbes for riparian areas
- Community awareness program about the effects of fertiliser practices especially for hobby farmers
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| Use of creeks for recreation - swimming, marroning |
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| Access for marroning potential to damage creeks |
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| People do not know what is in the water and what the impact of their land uses is |
- Need to have district monitoring and a monitoring centre so people can get an idea of what is in their creeks
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| Vegetation |
| Some creeks have no native vegetation |
- Fence and revegetate or grass with perennial pastures eg. kikuyu to stop erosion
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| Native vegetation dying through lack of fencing |
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| Lack of vegetation along creeks |
- Fund fencing, plant vegetation, plant to attract birdlife
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| Condition of native vegetation |
- Fence off native vegetation - seek funding opportunities
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| Clearing of native vegetation |
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| Need broadscale revegetation, not individual trees |
- Revegetate with native plant species and return fauna to increase tourism
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| Overclearing of land |
- Approach farmers to replant
- Quality control system to encourage revegetation
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| Clearing of hill tops for residences (planning issue) |
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| Fires leading to erosion |
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| Surface water management |
| Surface water on farmland |
- Better perennials, combination with alternative grasses
- Surface drainage and deep ripping
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| Speed of water flow off land |
- Wetlands, dams to slow flow
- Flood/sluice gates on creek systems to control flows and hold water back
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| Salinity |
| Salinity? |
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| Increasing salt levels in creeks when low flow |
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| Lowering the groundwater tables is good for salt but not for nutrients |
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| Acidity |
| Soil acidity |
- Education, soil testing, perennials
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| Land use changes |
| Significant land use change in a short time period (eg. <5 years) |
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| Bluegums are a monoculture with no understorey - more nutrients running off from bluegums - bluegums plantations taking up valuable agricultural land |
- Planning controls needed regarding location of plantations
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| Urban impacts |
| Urban pollution |
- Strategic revegetation
- Rivers of green
- Rationalise the width of the drain reserve
- Buffer zones for development
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