TORBAY CATCHMENT REPORT CARD 2005
This report card gives an update on the health of the Torbay catchment and efforts to improve its condition.

The community selected 6 factors as highly valued.

The current state of these factors and any changes are reported and compared to targets in the TORBAY RESTORATION PLAN.

improving getting worse no change insufficient data

Catchment Overview: Is the health of the catchment changing?
WATER QUALITY &
ALGAL BLOOMS
Lake Powell & Marbelup Brook: worst blooms in Western Australia.
Torbay Inlet improved in 2004/05 compared to the last five years.

WATER QUALITY
CATCHMENTS & WATERWAYS
NITROGEN (N) concentrations are high in four of the six sub-catchments but decreasing in two subcatchments.
PHOSPHORUS (P) remains high in five sub-catchments.

REPAIR WORK ON WATERWAYS Levels of fencing and revegetation of waterways by landholders increasing.

CONTROL OF WEEDS Areas of watsonia controlled increasing. Need to map weeds to see if control is getting on top of spread.

pH AND PHOSPHORUS IN SOILS pH levels increasing - soils less acidic.
Increasing stores of P in soils - could end up in waterways.

SATISFACTION LEVELS Many people involved in groups but need more data on satisfaction to see trends.

TORBAY CATCHMENT HEALTH REPORT CARD 2005
How are we going?
WATER QUALITY & ALGAL BLOOMS Restoration plan theme 1
Target for 2025:
Reduce algal blooms by one third.

Months in bloom 5 yr average 2004/05
Non toxicToxicNon toxicToxic
Lake Powell2.4434
Marbelup Brook1.2122
Torbay Inlet0.61.4-1
WATER QUALITY & ALGAL BLOOMS
CATCHMENTS & WATERWAYS
Restoration plan theme 1
Target for 2025:
Reduce nutrients from each sub-catchment so
total catchment nutrient load is reduced by 38%
for nitrogen and 24% for phosphorus.


1997 - 2004 concentration levels & trends
NP Total Nitrogen Total Phosphorus
Five Mile Creek High - decreasing Very High - no change
Seven Mile Creek Mod - decreasing High - no change
Cuthbert Drain High - no change Moderate - no change
Grasmere Creek High - decreasing High - no change
Marbelup Brook Low - no change High - no change
Torbay Drain High - no change High - no change
LEVEL OF REPAIR WORK ON
WATERWAYS AND DRAINS
Restoration plan themes 1 and 5
Targets for 2010:
Fence and revegetate 150kms key waterways
ie: 30 kms per year.

Total 2000 - 2005 2005
Fencing of waterways 68.5 kms 17.5 kms
Supported via Torbay Catchment Group - individual landholders are doing lots more !
CONTROL OF WEEDS Restoration plan theme 4
Target for 2015:
Map priority weeds.
Achieve 10% reduction in priority weeds per year.

2000 2001 2002 2003 2004
Kms road verge sprayed 4 30 60 65 70
Catchment group and others spray annually - road verges, Elleker townsite, railway and drain reserves with 2 years of follow up.
Is control on top of the spread of weeds? Regular mapping is needed to know!
FARMING SYSTEMS
STATUS OF pH AND PHOSPHORUS STORED IN SOILS
Restoration plan theme 5
Target for 2025:
Total catchment nutrient load is reduced
for nitrogen and phosphorus.

Status of soils Year High Medium Low
pH (acidity/ alkalinity index - high means less acidic soils higher productivity) 1988/89 17% 36% 46%
2004 26% 36% 37%
Phosphorus (P not taken up by plants is more likely to be lost to waterways) 1988/89 51% 20% 29%
2004 75% 18% 7%
SATISFACTION ABOUT LIVING IN THE CATCHMENT Restoration plan theme 7
Target:
Maintain high level of satisfaction
in catchment.
2002 landholder survey showed:
  • high levels of involvement in local groups 49% of responses,
  • 15% of respondents had volunteered for community landcare.
Needs more data on satisfaction. A repeat survey to look at trends is planned.

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