Water quality in the Richmond

Rous County Council takes a leading role in water quality monitoring in the Richmond and has commenced a new partnership with the NSW Department of Planning Industry and Environment (DPIE) and Southern Cross University (SCU). Rous County Council has installed a new system of water quality data loggers in the lower Richmond River and will discontinue weekly manual sampling.

A series of permanent monitoring sites within the Richmond River estuary and upstream catchment areas have been installed. These will measure pH, salinity, temperature, dissolved oxygen and turbidity. Results from the new data loggers are available at this water quality dashboard.

Disclaimer: 

"The water quality dashboard contains live data and information that is not actively reviewed. Accordingly, Council does not certify the accuracy of the data and information or warrant that it is free from error or omission. The data and information is provided for general information purposes only and should not be construed as professional, specialist or technical advice. Any reliance placed on the data and information shall be at the sole risk of the user and the accuracy of the data and information should be verified prior to using it.

The data and information contained in the water quality dashboard will periodically be reviewed and the subsequent QA/QC data reports made available via this webpage as they become available. While all reasonable care will be taken in reviewing the data contained in these reports, similarly, no warranty will be given that the review and the reports are free from error or omission."

The number of Rous County Council data logger locations is increasing from five to seven, with loggers at Rocky Mouth Creek, Tuckean Barrage (upstream), Tuckean Barrage (downstream) , and new sites at North Creek (Ross Lane), Bungawalbin Creek, Wardell and Woodburn.

Rous County Council is undertaking water quality monitoring in the lower Richmond floodplain with data loggers designed and serviced by SCU. Rous County Council were successful with winning a 3-year grant under the NSW Coast and Estuary Grants program titled 'Richmond River water quality monitoring project', for implementation from 2020. The new grant and partnership has been made with consultation with our constituent councils, technical advice from DPIE, SCU and the UNSW Water Research Laboratory.

Richmond River salinity results

November 2020: Current real time data of salinity in the Richmond River can be accessed from two locations (Coraki and Oakland Road) at the WaterNSW website.

Search under the Rivers and Streams option and navigate to the Richmond River via the online map. The two-point source locations of Coraki and Oakland Road provide current salinity results.

Real time dataloggers being deployed by Rous County Council late in 2020 will measure salinity at two further lower river locations, being Wardell and Woodburn. A user-friendly summary of real time salinity levels in the lower river, combining the two WaterNSW and Rous County Council sites, will be provided in 2021 and displayed on this website.

Local Land Services can provide assistance to landholders regarding acceptable salinity levels for stock and irrigation purposes. See Water for livestock: Interpreting water quality tests or contact Local Land Services for more information. Best practice for landholders is to obtain a handheld salinity meter to test river salinity prior to any drawing of water for livestock or irrigation purposes. Suitable salinity meters range in price from around $100-$300 and are available at numerous locations online.

Historical water quality data

The Richmond River’s water quality is influenced by natural processes such as the tide, rainfall and season, and by anthropogenic (human induced) clearing, draining and management, which can result in high nutrients, turbid water, acid water and blackwater. This link to turbidity shows filtered samples of river water before and after rain. Historical water quality data is available below, or please see this Review of Water Quality in Rocky Mouth Creek.

Historical water quality monitoring graphs

2020 Coraki Kilgin Rocky Mouth Creek Swan Bay Woodburn Bagotville Barrage
2019 Coraki Kilgin Rocky Mouth Creek Swan Bay Woodburn Bagotville Barrage
2018 Coraki Kilgin Rocky Mouth Creek Swan Bay Woodburn Bagotville Barrage
2017 Coraki Kilgin Rocky Mouth Creek Swan Bay Woodburn Bagotville Barrage
2016 Coraki Kilgin Rocky Mouth Creek Swan Bay Woodburn Bagotville Barrage
Note: Records are available dating from 2013.

Historical salinity reports

2020 January February March April May June
July August September October November December
2019 January February March April May June
July August September October November December
2018 January February March April May June
July August September October November December

12-month historical water quality data

January 2020 Summary        
December 2019 Summary        
November 2019 Summary        
October 2019 Summary        
September 2019 Summary        
August 2019 Tuckean Swamp
Site 1
Tuckean Swamp
Site 2
Tuckean Swamp
Site 4
Rocky Mouth Creek

North Creek

July 2019 Tuckean Swamp
Site 1
Tuckean Swamp
Site 2
Tuckean Swamp
Site 4
Rocky Mouth Creek  
June 2019 Tuckean Swamp
Site 1
Tuckean Swamp
Site 2
Tuckean Swamp
Site 4
Rocky Mouth Creek

North Creek

May 2019 Tuckean Swamp
Site 1
Tuckean Swamp
Site 2
Tuckean Swamp
Site 4
Rocky Mouth Creek

North Creek

April 2019 Tuckean Swamp
Site 1
Tuckean Swamp
Site 2
Tuckean Swamp
Site 4
Rocky Mouth Creek North Creek
March 2019 Tuckean Swamp
Site 1
Tuckean Swamp
Site 2
Tuckean Swamp
Site 4
Rocky Mouth Creek

North Creek

February 2019 Tuckean Swamp
Site 1
Tuckean Swamp
Site 2
Tuckean Swamp
Site 4
Rocky Mouth Creek North Creek

These parameters are used in the above data graphs to determine water quality levels:

  • Electrical conductivity
    Electrical conductivity (EC) is a measure of the concentration of ion in solution. EC is temperature-dependant (increasing approximately 2-3% per degree Celsius). International convention dictated that the measurements are to be standardised to 15oC; this is known as specific conductivity. The electrical conductivity of sea water is 55-60mS/cm, which converts to 35 parts per thousand (ppt). EC below 1.8mS/cm is considered fresh by the Australian and New Zealand Environment Conservation Council (ANZECC) Water Quality Guidelines.
     
  • pH
    pH is a measure of acidity/alkalinity, with values ranging from 0 to 14. pH; values below 7 indicate acidic conditions. ANZECC guidelines for the protection of aquatic ecosystems indicated that a pH range between 6.5 and 9 is acceptable.
     
  • Dissolved oxygen
    Dissolved oxygen (DO) in terms of mg/L is a measure of the concentration of oxygen dissolved into the water. The concentration of oxygen in water can be influenced by temperature, pressure and ionic concentration. The DO concentration can vary greatly with biological activity. ANZECC guidelines recommend that DO is above 6mg/L over a diurnal cycle. DO is one of the most important water quality parameters to measure the health of a water body.
     
  • Temperature
    The ANZECC guidelines for the protection of aquatic ecosystems for temperature of fresh and marine waters is <2oC change. While for a fully marine system this sounds reasonable, most waterways can vary up to 10oC over the daily cycle, as a result of solar radiation inputs and convection by atmospheric temperature. This is especially noticeable in shallow or stratified waters without shading riparian vegetation.
     
  • Total dissolved solids (TDS)
    TDS is a measure of the combined content of all inorganic and organic dissolved molecular, ionized or suspended micro-granular substances in the water, including minerals, salts or metals measured in parts per thousand (ppt).
     
  • Turbidity
    Turbidity is a measure used to quantify the degree to which light travelling through the water column is scattered by suspended particles. Increasing turbidity will reduce light penetration into a water body, and therefore have a detrimental effect on the potential for photosynthesis. If turbidity is mainly caused by organic particles, there is a high risk of oxygen depletion.The ANZECC guidelines for the protection of aquatic ecosystems for turbidity of fresh and marine waters is <10% seasonal change. This idea of seasonal change allows for flood events where there is an increase suspended load that will be settled out after the fresh has passed.
     
  • Water level
    This parameter measures the rises and falls in water level. These variations can be attributed to the incoming and outgoing tides, as well as rainfall events.
     
  • Rainfall
    Rainfall is often a trigger for changes in water quality.

Definition sources: Manly Hydraulics Laboratory.