| 词条 | Cotter Dam |
| 释义 |
| name = Cotter Dam | name_official = | image = Cotter Dam from below.JPG | image_size = 250px | image_caption = Cotter Dam, 2013 | image_alt = | location_map = Australia Australian Capital Territory | location_map_size = 250px | location_map_caption = Location of the Cotter Dam in the ACT | coordinates = {{coord|35.31955|S|148.93853|E|type:landmark_region:AU-ACT|display=inline,title}} | location = Australian Capital Territory, Australia | purpose = Potable water supply | status = O | construction_began = | opening = {{start date|1912|df=y}}; {{start date|2013|df=y}} | demolished = | cost = | owner = ACTEW Corporation | dam_type = G | dam_height = {{convert|87|m|abbr=on}} | dam_height_thalweg = | dam_height_foundation = | dam_length = {{convert|330|m|abbr=on}} | dam_width_crest = | dam_width_base = | dam_volume = {{convert|380|e3m3|abbr=on}} | dam_elevation_crest = | dam_crosses = Cotter River | spillway_count = 1 | spillway_type = Uncontrolled | spillway_capacity = {{convert|5670|m3/s|abbr=on}} | res_name = Cotter Reservoir | res_capacity_total = {{convert|78|GL|impgal USgal|abbr=on}} | res_capacity_active = | res_capacity_inactive = | res_catchment = {{convert|482|ha|acre|abbr=on}} | res_surface = {{convert|285|ha|acre|abbr=on}} | res_elevation = {{convert|550.8|m|abbr=on}} | res_max_depth = | res_max_length = | res_max_width = | website = {{URL|http://www.actew.com.au/Water%20and%20Sewerage%20Systems/ACT%20Water%20Supply%20System/The%20Water%20Network/Water%20storage/Cotter%20Dam.aspx|Cotter Dam}} at ACTEW Water | extra = }} The Cotter Dam is a concrete gravity and rockfill embankment dam across the Cotter River, located in the Australian Capital Territory, Australia. The impounded reservoir is called the Cotter Reservoir which is a supply source of potable water for the city of Canberra and its environs. Original dam completed in 1912The original concrete gravity Cotter Dam was built in 1912 when the city of Canberra was established. The height of the dam wall was raised to a height of {{convert|31|m}} in 1951 in order to increase capacity of the reservoir. The {{convert|26|e3m3|adj=on}} dam wall was {{convert|118|m}} long and created a reservoir with a surface area of {{convert|500|e3m3}}. The uncontrolled spillway was capable of discharging {{convert|850|m3/s}}. At that time, the top water level of the dam was {{convert|501|m}} above sea level and the reservoir had a capacity of {{convert|3856|ML|impgal USgal}}.[1] A subsequent review in October 2006, using more accurate mapping methods, resulted in capacity being re-estimated downwards from the previous estimate of {{convert|4700|ML|impgal USgal}}. Additional galleries and drains were constructed between 1984 and 1986.[1] In order to supply the city with potable water, water from the reservoir was pumped to Mount Stromlo, and from there the water flowed by gravity to fill the city's reservoirs. From the 1960s onwards, better quality water could be supplied without pumping using the newly completed Bendora and Corin dams, and Cotter Dam was only used when water was in short supply. However, in December 2004, ACTEW Corporation brought the dam back on line in response to the ongoing drought.[2] Enlarged dam completed in 2013Completed in 2013, the enlarged Cotter Dam comprises a new {{convert|87|m|adj=on}} high roller compacted concrete (RCC) dam wall built downstream from the old {{convert|26|m|adj=on}} high dam wall, along with two auxiliary embankment dam walls along low-lying adjoining valleys. Constructed on rock foundations by Abigroup{{endash}}John Holland joint venture, with engineering design by GHD, the main dam wall is {{convert|330|m}} long, with the two rockfill embankments {{convert|340|m}} and {{convert|300|m}} long and {{convert|15|m}} and {{convert|18|m}} high respectively, both with internal earthen cores.[1] The enlarged dam walls increased the storage capacity of the Cotter Reservoir from the previous {{convert|3.9|GL|impgal USgal}} to {{convert|78|GL|impgal USgal}};[3] while the catchment area remains {{convert|482|ha|acre}}.[1] The old dam wall remains, inundated by the water held behind the new dam wall and acting as a sediment trap for the new dam's intake tower. The old dam may only be visible in exceptional circumstances of drought. Completion was originally scheduled for the end of June 2011,[4] however construction was delayed until August 2013[5] due to heavy rainfalls in the summer of 2010/2011,[6] the discovery of an unexpectedly large rock seam at the site of the foundations in 2011,[7] and severe flooding in March 2012.[8] The uncontrolled spillway is capable of discharging {{convert|5670|m3/s}} from the {{convert|285|ha|acre|adj=on}} Cotter Reservoir,[1] with a high water level approximately {{convert|550.8|m}} above sea level.[2] See also{{portal|Australian Capital Territory}}
References1. ^1 2 3 4 {{cite web|url=http://www.ancold.org.au/wp-content/uploads/2012/10/Dams-Australia-2010-v1-for-website.xls|format=Excel (requires download)|title=Register of Large Dams in Australia|publisher=Australian National Committee on Large Dams|year=2010 |accessdate=4 April 2014|work=Dams information}} 2. ^1 {{cite web |url=http://www.actew.com.au/Water%20and%20Sewerage%20Systems/ACT%20Water%20Supply%20System/The%20Water%20Network/Water%20storage/Cotter%20Dam.aspx | archiveurl=https://web.archive.org/web/20140414222046/http://www.actew.com.au/Water%20and%20Sewerage%20Systems/ACT%20Water%20Supply%20System/The%20Water%20Network/Water%20storage/Cotter%20Dam.aspx |title=Cotter Dam |work=ACTEW Water |publisher=ACTEW Corporation |date=2011 |accessdate=4 April 2014 | archivedate=14 April 2014 | deadurl=yes}} 3. ^{{cite web|title=Enlarged Cotter Dam|url=http://www.actew.com.au/Our%20Projects/Enlarged%20Cotter%20Dam.aspx|work=ActewAGL|accessdate=20 October 2013}} 4. ^{{cite web |title=Enlargement of the Cotter Reservoir - Development application |publisher=ACTEW Corporation |accessdate=4 January 2013 |url=http://www.actew.com.au/Our%20Projects/Enlarged%20Cotter%20Dam/Project%20Approval%20Documents/Enlarged%20Cotter%20Dam%20Development%20Application.aspx |date=July 2009}} 5. ^{{cite news |url=http://www.canberratimes.com.au/act-news/405m-dam-operational-but-more-work-to-be-done-20130806-2rdrt.html |title=$405m dam operational, but more work to be done |work=The Canberra Times |date= |accessdate=6 September 2013 }} 6. ^{{cite press release |title=Rain delays Enlarged Cotter Dam by three months |url=http://www.actew.com.au/News%20and%20Publications/News%20and%20Events/2011/February/14/Rain%20delays%20Enlarged%20Cotter%20Dam%20by%20three%20months.aspx |publisher=ACTEW Corporation |date=14 February 2011 |accessdate=4 April 2014 }} 7. ^{{cite web |title=Enlarged Cotter Dam construction and schedule update |url=http://www.actew.com.au/News%20and%20Publications/News%20and%20Events/2011/July/11/Delays%20to%20the%20completion%20of%20Enlarged%20Cotter%20Dam.aspx |publisher=ACTEW Corporation |accessdate=4 January 2013}} 8. ^{{cite news |url=http://www.canberratimes.com.au/act-news/cotter-spills-as-deluge-hits-region-20120301-1u6am.html |work=The Canberra Times |title=Cotter spills as deluge hits region |author1=Kretowicz, Ewa |author2=Downie, Graham |date=2 March 2012 |accessdate=13 February 2013 }} External links{{commons-inline}}
9 : Roller-compacted concrete dams|Dams completed in 1912|Dams in the Australian Capital Territory|Embankment dams|Gravity dams|Rock-filled dams|Dams completed in 2013|Murray-Darling basin|1912 establishments in Australia |
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