Xayaburi Dam is located along the Mekong basin and reflects the balance between the stream self-cleaning potential and human pressure on the riparian zone. The issues that will arise with Xayaburi dam were; the disruption of fish spawning routes, the blocking sediment flow and the allowance of the incursion of saline water upstream. The dam could also affect the communities downstream and the people working along the Mekong such as fishmen.
The Dam will impact; flow dynamics, water quality, nutrients, sediment, habitat fragmentation and aquatic biodiversity. Due to these environmental impacts the EIA stated, ‘It is recommended to identify and describe the physical characteristics of these habitats for future habitat recovery before impoundment.' Due to these discovered impacts a few management strategies have been established to decrease the impact that the dam will have on the ecosystem. The main and most influential strategies include; a fish pass, built with 2 fish ladders both 3m deep x 10m wide, one 600m long, other 800m long, which would allow for migration and any necessary aquatic movement and the water being kept largely flowing so the daily flow regime is not affected.
Warragamba dam is located south of the Blue Mountains and about 65 kilometres west of Sydney. The Australian Government maintains the water quality, according to Australian Drinking guidelines, through a systematic and standardised approach. The Australian Government is also required to Implement programs to reduce risks and issues relating to water quality. The main ecological issues that affect the dam include; Livestock and grazing, fertilizers and Mining and Quarries. These issues are each combated using specific and effective strategies such as community education, monitoring-water testing, Financial assistance and Planning and regulations. However, because the dam supplies water to 80% of Sydney, it is essential to maintain the water quality so it does not have negative effect on someone's health. WaterNSW protects the health of the catchments to ensure reliable, quality drinking water is available for the 4.5 million people of Sydney and the Illawarra, Blue Mountains, Southern Highlands, Goulburn and Shoalhaven regions. A multi-barrier approach incorporating; the catchment, reservoirs, delivery, treatment, tap is taken to guarantee safe, drinkable water.
Xayaburi dam construction started in 2012 and will be finished in 2020.
Xayaburi dam cost $3.8 Billion for full construction and is owned by a private power company called Xayaburi Power Company.
The dam's construction will ultimately cause around 2,100 people to be resettled, and more than 202,000 people living in the dam's area will experience impacts due to the loss of agricultural land and riverbank gardens.
Warragamba dam took 12 years and 1,800 workers to build the dam, which opened in 1960.
It took $1 billion to raise the dam to a safe height.
The concrete used was mixed on site using 305,000 tonnes of cement and 2.5 million tonnes of sand and gravel. The sand and gravel was transported from McCann's Island in the Nepean River via an aerial ropeway.