Water Journal : Water Journal June 2015
JUNE 2015 WATER 91 Technical Papers Search no longer! Visit www.h2oz.org.au Managed by Searching for the beSt candidateS for your company? Searching for the lateSt job opportunitieS in the water Sector? StStS for your company? Searching for the late opportunitie There are surprising opportunities when you work in water Following the drilling, installation and development of each bore, In Situ Rugged TROLL 100 downhole dataloggers were deployed at each surface water and groundwater monitoring site. Dataloggers typically collect water level and temperature data on an hourly or six-hourly basis and are managed by Melbourne Water. CONCLUSION Melbourne Water is now familiar with the technical, logistic and planning approval requirements relevant to the development of water monitoring networks. The method adopted can be applied to other Melbourne Water priority GDE sites using the updated ‘GDE Catalogue’. This project established GDE monitoring networks at five sites in Melbourne Water’s service area. The collection of baseline data, periodic data download and review of collected data has commenced, with the objective of assessing potential GDE impacts. THE AUTHORS Tony Cauchi (email: Tony. Cauchi@ghd.com) is a Chartered Professional Engineer and Senior Hydrogeologist with GHD, with over nine years’ consulting experience working directly with water industry clients in the Victorian and South Australian governments, Federal Government, mining and infrastructure sectors. Sarah Gaskill has over 20 years of experience in environmental water management. She worked for the Environment Agency (UK) in hydrology, abstraction management and groundwater wetland investigations for 15 years, before moving to Melbourne Water in 2009. At Melbourne Water she has continued to grow her knowledge in environmental water management, planning and delivering many projects relating to rivers and wetlands. REFERENCES Victorian Department of Environment and Primary Industries (DEPI) (2013): Permitted Clearing Of Native Vegetation, Biodiversity Assessment Guidelines. Table 1. Inferred role of groundwater. GDE Site Hydrological Process Groundwater Role Boneo Swamp (Tootgarook Wetlands) Groundwater seepage from adjacent hydrogeological units maintains groundwater levels in the Quaternary Aquifer throughout the year. Identified Ecological Vegetation Classes (EVCs) are reliant on shallow groundwater levels. Seaford Swamp Stormwater inputs from surrounding urban areas periodically flush shallow groundwaters, maintaining fresh groundwater qualities in the Quaternary Aquifer. Identified Ecological Vegetation Classes (EVCs) are reliant on shallow groundwater levels. Truganina Swamp Groundwater from tidal, marine quality aquifers are hydraulically connected to regional water table aquifers, maintaining shallow groundwater levels. Identified EVCs are likely to be reliant on shallow groundwater levels and saline groundwater quality. Deep Creek (Musteys Bridge and Doggetts Bridge) Stormwater inputs from surrounding urban areas periodically flush shallow groundwaters, maintaining fresher groundwater qualities in the Quaternary Aquifer. Without this periodic flushing, Seaford Swamp may be vulnerable to salinisation. Groundwater contaminants have the potential to impact swamp water quality and EVC health. Western Port (Tooradin) The dependence of the identified ecosystems upon groundwater is not well understood at Truganina Swamp. Local aquatic fauna rely on groundwater levels to be close to or above the bed level. Changes to the existing groundwater level regimes may result in habitat loss.
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