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Excellence in Water Engineering for the Northern Territory

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Excellence in Water Engineering for the Northern Territory EXCELLENCE IN WATER ENGINEERING FOR THE NORTHERN TERRITORY WRM UNDERSTANDS WATER IN THE TERRITORY WRM Water & Environment has a wealth of Julian joined WRM in 2006 and has worked as a experience in the Northern Territory ever since surface water specialist throughout his career. His completing a comprehensive flood study of the broad experience in all aspects of surface water Katherine River in the late 1990s. We have advised assessment spans the government, mining and miners, developers and government agencies on how development sectors. Long-time Territorian Phill to best manage water in the wide range of climatic Piper has over 40 years’ experience working as a conditions that occur across the top end. professional engineer with the NT Public Service and as a consultant. Our Darwin office was established in 2018 to better service our NT clients. In 2021, our office relocated to Our Darwin-based modelling team enables us to offer larger premises in Whitfield Street. The NT office team dedicated local resources to our NT clients. We are has expanded to include WRM Principal Julian Orth also able to call on the wider WRM team of more than (NT Office Manager), a specialist Project Engineer, 20 specialist engineers to take on the largest and most and NT Business Development Manager Phill Piper. complicated projects in the Territory. KNOTTS CROSSING UPSTREAM OF KATHERINE 3 WRM KNOWS WATER Our specialist team has resolved water management We have demonstrated high-level expertise in: issues for the private sector and all levels of • flood hydrology government throughout Australia. We deal with water at all scales, from a single allotment to an entire • regional water strategy and policy development river basin. • mine water management We have developed planning and policy tools, designed • erosion and sediment control water management infrastructure and provided • water quality monitoring and management detailed advice to help our clients achieve their goals. Our plain-language reports are technically sound • floodplain management and comprehensive. • flood damage assessment We help our clients manage risk and give them a • flood mitigation options assessment well-researched, logical basis to deal with competing interests for water resources. • stormwater drainage and management • natural channel design • flood risk assessment and minimisation • water sensitive urban design • stormwater harvesting • accurate hydrological and hydraulic modelling • design and planning evaluation • peer review • acting as expert witnesses • water balance and contaminant transport modelling • water supply planning and security assessment. 4 WRM KNOWS WATER McARTHUR RIVER WET SEASON FLOWS AT THE NATIONAL HIGHWAY CROSSING AT BORROLOOLA 5 COMPREHENSIVE UNDERSTANDING Our knowledge isn’t limited to water engineering. Our key NT experience includes: By bringing an understanding of policy development, • McArthur River Mine government procedures and legislative requirements to • Katherine Flood and Flood Mitigation Studies our work, we are able to give advice and prepare reports • Adelaide River Flood Study which minimise risk and are ready to implement. • Jervois Base Metals Project • Kilgariff development We’ve helped federal, state and local governments to • Alice Springs Flood and Flood Mitigation Studies have confidence in their planning and decision making. • Tennant Creek Stormwater Investigation This has included managing catchments and river • Darwin CBD Stormwater Investigation systems, reviewing development proposals, preparing • Yuelamu Water Supply Investigations for future flood events and ensuring that water quality • Nathan River Resources Project is managed effectively throughout a region. • Elizabeth River Flood Studies • Litchfield Council Stormwater Investigations • Batchelor Solar Farm Flood study • Livingstone Solar Farms Flood Study • Flood insurance assessments • GEMCO Flood Impact Assessments • Gove closure plan. EXAMPLES OF OUR SKILLS AND EXPERIENCE INCLUDE: Developing water management strategies in a Identifying and managing major river floods challenging environment We completed a comprehensive set of flood depth As we did for McArthur River Mine. The water and hazard maps for events up to the Probable management strategy identified the required Maximum Flood across the Adelaide River infrastructure and management approaches to floodplain. The flood model results were used to deal with the complex interactions of flooding, identify the existing flood risk and flood hazards groundwater and mine process water across the throughout the Adelaide River town area including site. Our work included additional drainage and the Stuart Highway and to determine the potential flood studies, designing new water management for development in the town area. In addition, flood infrastructure, preparing annual water balances and emergency response classifications and potential providing advice on regulatory matters. flood evacuation routes were determined for the Adelaide River Town for different magnitudes of flooding. 6 COMPREHENSIVE UNDERSTANDING Assessing water use and impacts for new Managing flooding and stormwater in the mining development urban environment WRM advised on water impacts for the Jervois We developed a flood and stormwater management Base Metal Project, a proposed copper, lead and plan for the Kilgariff estate, about 9 km south of zinc mine located about 270 km northeast of Alice Alice Springs. A key challenge was to define a Springs. Surface water management at the project drainage strategy that was sympathetic to the local needs to ensure adequate water supply for operations environment but maximised the developable areas while managing runoff during the wet months, and is with sufficient immunity from flooding from the Todd complicated by legacy infrastructure on the site. A River and St Marys Creek. Stormwater management comprehensive surface water management system was problematic, given the very low relief and was developed for the project which will ensure ill-defined drainage lines. The study delivered a water supply, minimise import water and protect provisional development layout for future demand, as downstream ecosystems. well as flood mitigation measures. MINERALISED ROCK OUTCROP AT JERVOIS BASE METAL PROJECT 7 SOLUTIONS TO COMPLEX PROBLEMS KNOWLEDGE SPECIALISATION We understand policy development as well as water Skills to handle the most complex of problems Faced with many complex inputs and vast areas, We’ve spent many years studying and working in all it’s vital that engineers understand the specific aspects of water engineering, and have developed a requirements of government. Our experience set of skills and experience which set us apart from working with all levels of government across Australia other engineering firms. In fact, we’re often hired by and internationally means that our work is always other consulting companies to peer review their work. relevant to a policy framework. We are able to overcome complex and rare problems That experience also extends to working across with competing priorities, that are simply beyond the diverse climates and geologies. scope of more generalist companies. 8 SOLUTIONS TO COMPLEX PROBLEMS INNOVATION RELIABILITY Clever thinking, underpinned by thorough research Robust, impartial advice that stands up to scrutiny We know when – and how – to modify existing We’re proud of our reputation for thorough methods and designs to come up with original ways to preparation and review of our technically robust meet each project’s unique challenges. reports, advice and recommendations. We do thorough research and take nothing for To our clients, it adds up to confidence. We provide granted, resulting in tailor-made solutions that stand solutions that don’t have to be revisited, with all the the test of time. delays that entails, and which stand up to public scrutiny and in court. We also have extensive experience as expert witnesses to back up our work. VICTORIA RIVER AT TIMBER CREEK 9 THE 1998 KATHERINE RIVER FLOOD INUNDATED MOST OF KATHERINE FLOOD MAPS IDENTIFY THE EXTENT AND DEPTH OF FLOODING FOR DIFFERENT SIZED FLOODS 10 CASE STUDY KATHERINE FLOOD INVESTIGATIONS Detailed flood and flood mitigation study for the Northern Territory Department of Infrastructure, Planning and Logistics. THE CHALLENGE THE RESULT Katherine has experienced significant flooding in the The flood modelling results were also used to identify past, including in 1931, 1940, 1957, 1998 and 2006. the existing flood risk and flood hazards throughout the The 1998 flood event, which is the largest on record Katherine town, to determine potential flood mitigation with an annual exceedance probability of less than measures and then to select and design the most 0.5%, inundated almost the entire town and caused appropriate structural mitigation measures. extensive damage. The flood modelling showed that it is possible to The key challenge for this project was to identify cost- significantly reduce flooding of properties in Katherine effective flood risk management measures to reduce during smaller, more frequent floods, such as a 5% AEP the risk of damage, disruption and costs associated with flood event. However, structural mitigation options major flooding in Katherine. would not work for larger floods such as the 1% AEP or rarer flood events. The study identified potential Detailed calibrated flood models were used to identify mitigation measures which included a combination flood-affected properties, potential
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