Blowering Reservoir

Blowering Reservoir
Name	Blowering Dam
Location	Tumut River, New South Wales, Australia
Coordinates	35°27′S 148°12′E
Type	Rock-fill with clay core
Length	1,071 m
Height	112 m
Volume	14,500,000 m³
Opening	1968
Operator	Snowy Hydro Limited
Reservoir	Blowering Reservoir
Capacity	1,628,000 ML
Catchment	2,566 km²

Blowering Reservoir Blowering Reservoir is a large impoundment on the Tumut River in the Snowy Mountains region of New South Wales, Australia. It was formed by the construction of a rock-fill dam completed in the late 1960s and is integrated with infrastructure for flood mitigation, irrigation, and hydroelectricity. The site is associated with major engineering works and environmental management efforts within the Murray–Darling Basin.

Overview

Blowering Reservoir lies on the Tumut River near the town of Tumut and the Snowy Mountains Highway, within the Riverina and the Murray–Darling Basin system. The reservoir is linked to regional water infrastructure including the Snowy Mountains Scheme, the Murrumbidgee Irrigation Area, and downstream nodes such as Wagga Wagga and Hay. The catchment involves rivers and localities associated with the Kosciuszko National Park area and is relevant to agencies like Snowy Hydro Limited and the New South Wales Water Directorate.

History and Construction

The decision to construct the dam was made during an era of post-war development associated with the Snowy Mountains Scheme and other major Australian public works. Construction commenced in the mid-1960s and the project was completed in 1968, reflecting engineering practices contemporary with projects such as the Snowy Scheme and other major dams in New South Wales and Victoria. Contractors, consulting engineers, and state authorities coordinated logistics through regional centres including Canberra and Wagga Wagga. The project influenced local communities such as Tumut and the Wiradjuri Traditional Owners, and is part of the broader narrative of Australian water resource development alongside works like the Hume Dam and Dartmouth Dam.

Dam and Hydroelectric Facilities

The wall is a rock-fill embankment with a central clay core, comparable in typology to other Australian embankment dams. The impoundment serves as a regulating storage for upstream and downstream hydroelectric stations linked to the Snowy Mountains Scheme, and operates in concert with power stations on the Tumut River cascade. The structure includes a gated spillway and outlet works that supply regulated flows for hydroelectric generation and irrigation. Operation is overseen by Snowy Hydro Limited and coordinated with New South Wales state water authorities and Commonwealth water portfolio arrangements.

Reservoir Ecology and Environment

The reservoir and its foreshore sit within ecosystems influenced by the Snowy Mountains and Riverina bioregions, with native species of flora and fauna subject to altered flow regimes resulting from impoundment. Aquatic habitats have been modified, influencing fish assemblages that include species noted in regional fish surveys. Riparian zones and wetland habitats downstream interact with environmental water allocations administered under frameworks linked to the Murray–Darling Basin Plan and state conservation statutes. Stakeholders such as the NSW Department of Planning and Environment and local landholders have engaged in programs addressing salinity, erosion, and revegetation to support habitat values and Traditional Owner cultural heritage.

Water Management and Uses

Blowering Reservoir functions as a multi-purpose storage providing regulated releases for irrigation in the Murrumbidgee Irrigation Area, environmental flows under basin planning arrangements, and water supply security for regional towns. It plays a role in flood mitigation for downstream centres including Gundagai and Wagga Wagga by attenuating high inflows, and interfaces with water trading and allocation systems administered by state water authorities. Coordination with Commonwealth water policy instruments and river operations similar to those governing the Snowy Mountains Scheme is critical for seasonal and inter-annual management.

Recreation and Tourism

The impoundment and surrounding reserves support recreational uses such as recreational fishing, boating, camping, and caravanning, attracting visitors from regional centres like Canberra, Wagga Wagga, and Tumbarumba. Local tourism operators and councils promote activities that tie into regional attractions including the Snowy Mountains, Kosciuszko National Park, and heritage trails. Facilities around the reservoir are managed in collaboration with local councils and state agencies to balance visitor services with conservation and cultural heritage considerations.

Safety and Incidents

Operational safety and emergency planning for the dam are part of state dam safety frameworks that also govern infrastructure like Hume Dam and Burrinjuck Dam. Emergency action plans, spillway inspections, and periodic safety reviews involve engineers, emergency services such as New South Wales State Emergency Service, and regulatory oversight. The site has been subject to routine safety works and operational adjustments in response to extreme rainfall events and seasonal inflows, reflecting broader regional flood risk management practices.

Category:Dams in New South Wales Category:Reservoirs in Australia Category:Snowy Mountains