What are some threats to the Nepean River?
The rivers and riparian lands of the Hawkesbury Nepean are experiencing significant pressure from urban and rural residential development; extraction of water for metropolitan water supply and agriculture; nutrient input from sewage treatment plants, on-site sewage systems and run-off from agricultural and urban areas; …
What do we know about the future of the Hawkesbury Nepean catchment area?
The future climate of the Hawkesbury- Nepean Catchment is likely to be warmer (Figure 2). Although projected changes in average rainfall are currently not clear, given projected increases in evaporation, the catchment is likely to be drier.
Who manages the Nepean River?
Hawkesbury–Nepean Catchment Management Authority
The total catchment area of the river is approximately 21,624 square kilometres (8,349 sq mi) and the area is generally administered by the Hawkesbury–Nepean Catchment Management Authority.
What was the Hawkesbury Nepean river used for?
The river then flows north through the gorge adjacent to Wallacia and enters Bents Basin before it is joined by the Warragamba River and changes its name to the Hawkesbury River. The Nepean River is economically important to the Sydney Basin and is used for mining, irrigation, recreation and other activities.
Is the Nepean River polluted?
Both the Nepean River and the Yarra River are exposed to many potential sources of contamination, such as faecal wastes from farm livestock, wildlife, and domestic animals, and pollution from urban streams and sewage. We calculated flows in the Nepean River can contain up to 30% treated sewage.
How clean is the Nepean River?
The Nepean River E. coli bacteria results showed river water quality was generally very good, particularly at the sites upstream of urban and agricultural development. We also compared bacteria results according to rainfall.
What are three things the Hawkesbury Nepean Flood Risk Management Strategy aims to do?
Flood Strategy
- Regional, coordinated flood risk management.
- Warragamba Dam Raising Proposal.
- Strategic and integrated land use and road planning.
- Contemporary flood risk information.
- An aware, prepared and responsive community.
- Improved weather and flood predictions.
- Best practice emergency response and recovery.
Why did the Hawkesbury flood?
Downstream of Sackville, the Hawkesbury-Nepean River flows through sandstone gorges and narrows in width. This creates a pinch-point that partially blocks the river channel. Just as a bath plug sitting half-way over a plughole slows an emptying bath, the Sackville pinch-point causes the bathtub to fill during floods.
What are the key water management issues in the Hawkesbury Nepean Catchment?
Specific water management issues include: water quality: pollution, algae and weed growth. river bank management: urban and agricultural development, construction of ‘instream’ development such as pontoons and wharves. environmental water: sufficient flows and freshes to maintain river health.
Does the Nepean river flow into the Hawkesbury?
Hawkesbury River
Grose River
Nepean River/Mouths
Is Nepean River safe?
While the water quality is generally better in the Nepean River, NSW doesn’t provide guidance on whether it’s safe for swimming. So in this regard, Victoria’s Yarra River could be considered safer.