{"id":33957,"date":"2024-03-20T17:01:23","date_gmt":"2024-03-20T06:01:23","guid":{"rendered":"https:\/\/ancold.org.au\/?p=33957"},"modified":"2024-03-20T17:05:49","modified_gmt":"2024-03-20T06:05:49","slug":"news-from-tasmania-murchison-dam-spillway-upgrade","status":"publish","type":"post","link":"https:\/\/ancold.org.au\/news-from-tasmania-murchison-dam-spillway-upgrade\/","title":{"rendered":"News from Tasmania &#8211; Murchison Dam Spillway Upgrade"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"33957\" class=\"elementor elementor-33957\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-95f0b00 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"95f0b00\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f48fc38\" data-id=\"f48fc38\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-20c3f2e elementor-widget elementor-widget-text-editor\" data-id=\"20c3f2e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Hydro Tasmania\u2019s Murchison Dam on Tasmania\u2019s West Coast has been undergoing a two staged risk-based spillway capacity upgrade since 2019. Stage 1 involved a 3m dam crest wall raise which was completed in October 2020. Stage 2, a partial raise of the right chute spillway wall commenced in early 2023 and is ongoing.<\/p><p>The Stage 1 parapet crest wall raise involved insitu and precast concrete construction as shown in the typical drawing section (Figure 1). The completed wall is shown in Figures 2 and 3.<\/p><p>The primary focus of the Stage 2 work is to partially raise the right chute wall by between 2.0-5.0m through construction of fourteen structurally connected concrete monoliths. Secondary works include the following activities:<\/p><ul><li>a small raise of the transition wall between the dam crest and the chute<\/li><li>downstream dam toe erosion protection to resist damage from back water eddy action during spill events, and<\/li><li>a spillway reinforcement and anchor investigation program.<\/li><\/ul><p>As Lake Murchison has very little flood storage buffer and typically spills on an annual basis, avoiding working within the chute for long durations is a key project and construction risk. This risk has been mitigated by eliminating work within the chute for the chute wall raise, active use of lake level forecasting models and a robust Dam Safety Emergency Plan and scheduling downstream toe and spillway anchor investigation works for lower flood risk months.<\/p><p>Stage 2 works are progressing well in large part due to the established collaborative approach being applied by all parties including Hydro Tasmania as the Principal, AECOM as provider of construction design support and site engineering, and Hazell Bros Group as the constructor. Challenging site conditions, particularly in the winter months, coupled with a dynamic construction program require constant communication between project team members to anticipate and remain on top of emerging issues.<\/p><p>Completion of Stage 2 works is currently likely to be towards the end of 2024.<\/p><p class=\"MsoNormal\"><b><span lang=\"EN-US\">Author: Oliver Giudici, Acting Project Manager<\/span><\/b><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3b207f8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3b207f8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-72191cc\" 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href=\"https:\/\/ancold.org.au\/wp-content\/uploads\/2024\/03\/Spillway-chute-wall-raise-\u2013-monolith-concrete-pour-by-crane-kibble-bucket.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"584eb4b\" data-elementor-lightbox-description=\"Spillway chute wall raise \u2013 monolith concrete pour by crane kibble bucket\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MzM5NjMsInVybCI6Imh0dHBzOlwvXC9hbmNvbGQub3JnLmF1XC93cC1jb250ZW50XC91cGxvYWRzXC8yMDI0XC8wM1wvU3BpbGx3YXktY2h1dGUtd2FsbC1yYWlzZS1cdTIwMTMtbW9ub2xpdGgtY29uY3JldGUtcG91ci1ieS1jcmFuZS1raWJibGUtYnVja2V0LmpwZyIsInNsaWRlc2hvdyI6IjU4NGViNGIifQ%3D%3D\">\n\t\t\t\t\t<div class=\"e-gallery-image elementor-gallery-item__image\" data-thumbnail=\"https:\/\/ancold.org.au\/wp-content\/uploads\/2024\/03\/Spillway-chute-wall-raise-\u2013-monolith-concrete-pour-by-crane-kibble-bucket-225x300.jpg\" data-width=\"225\" data-height=\"300\" aria-label=\"Spillway chute wall raise \u2013 monolith concrete pour by crane kibble bucket\" role=\"img\" ><\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__overlay\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<a class=\"e-gallery-item elementor-gallery-item elementor-animated-content\" href=\"https:\/\/ancold.org.au\/wp-content\/uploads\/2024\/03\/DJI_0943-scaled.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"584eb4b\" data-elementor-lightbox-description=\"Monolith construction progress as of 14th March 2024\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MzM5NjAsInVybCI6Imh0dHBzOlwvXC9hbmNvbGQub3JnLmF1XC93cC1jb250ZW50XC91cGxvYWRzXC8yMDI0XC8wM1wvREpJXzA5NDMtc2NhbGVkLmpwZyIsInNsaWRlc2hvdyI6IjU4NGViNGIifQ%3D%3D\">\n\t\t\t\t\t<div class=\"e-gallery-image elementor-gallery-item__image\" data-thumbnail=\"https:\/\/ancold.org.au\/wp-content\/uploads\/2024\/03\/DJI_0943-300x169.jpg\" data-width=\"300\" data-height=\"169\" aria-label=\"Monolith construction progress as of 14th March 2024\" role=\"img\" ><\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__overlay\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Hydro Tasmania\u2019s Murchison Dam on Tasmania\u2019s West Coast has been undergoing a two staged risk-based spillway capacity upgrade since 2019. Stage 1 involved a 3m dam crest wall raise which was completed in October 2020. Stage 2, a partial raise of the right chute spillway wall commenced in early 2023 and is ongoing. The Stage [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":33963,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[33,50,57],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>News from Tasmania - Murchison Dam Spillway Upgrade - ANCOLD<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ancold.org.au\/news-from-tasmania-murchison-dam-spillway-upgrade\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"News from Tasmania - Murchison Dam Spillway Upgrade - ANCOLD\" \/>\n<meta property=\"og:description\" content=\"Hydro Tasmania\u2019s Murchison Dam on Tasmania\u2019s West Coast has been undergoing a two staged risk-based spillway capacity upgrade since 2019. Stage 1 involved a 3m dam crest wall raise which was completed in October 2020. Stage 2, a partial raise of the right chute spillway wall commenced in early 2023 and is ongoing. The Stage [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ancold.org.au\/news-from-tasmania-murchison-dam-spillway-upgrade\/\" \/>\n<meta property=\"og:site_name\" content=\"ANCOLD\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-20T06:01:23+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-20T06:05:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ancold.org.au\/wp-content\/uploads\/2024\/03\/Spillway-chute-wall-raise-\u2013-monolith-concrete-pour-by-crane-kibble-bucket.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"614\" \/>\n\t<meta property=\"og:image:height\" content=\"819\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Michelle Miller\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michelle Miller\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/ancold.org.au\/news-from-tasmania-murchison-dam-spillway-upgrade\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/ancold.org.au\/news-from-tasmania-murchison-dam-spillway-upgrade\/\"},\"author\":{\"name\":\"Michelle Miller\",\"@id\":\"https:\/\/ancold.org.au\/#\/schema\/person\/a8bdd0d7d17b131367ab134936b02e56\"},\"headline\":\"News from Tasmania &#8211; 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