Hydrology & flood engineering
Hydrologist — Albany, Western Australia
Overview
Fiord Group provides hydrologist and flood engineering services in Albany, Western Australia. The practice is based in Denmark, about 55 kilometres west along the south coast, and works throughout Albany and the Great Southern on flood studies, catchment and floodplain modelling, stormwater and drainage design, and the hydrology supporting development and environmental approvals. Principal Blake Marxsen is an environmental engineer and hydrologist, MIEAust, with a delivery record spanning mining, energy, infrastructure and government projects in Australia and overseas.
Services in Albany
- Flood studies and flood impact assessment for development applications — Flood Impact Assessment
- Catchment and floodplain modelling to Australian Rainfall & Runoff (ARR) 2019 — Flood Hydrology & Modelling
- Stormwater and surface water management plans for subdivision and industry — Surface Water Management
- Culvert, levee and detention basin design through to construction drawings — Hydraulic Structure Design
- Watercourse realignment and creek diversion design — River & Creek Diversions
- Flood immunity assessment for roads, rail and critical assets — Flood Resilience of Infrastructure
- Hydrological input to DWER and EPA Western Australia approvals — Hydrology for Approvals
The Oyster Harbour and King George Sound catchments
Albany drains to three receiving waters, and which one a site sits above changes the assessment. Oyster Harbour takes the two largest systems to the north-east; Princess Royal Harbour takes the city and port catchment to the south-west; Torbay Inlet sits further west along the coast.
Oyster Harbour carries the volume. The Kalgan River runs about 140 kilometres through a catchment of roughly 2,560 square kilometres and is the region’s fourth largest river by average annual flow at around 53,400 megalitres. The King River is much shorter — about 27 kilometres, fed principally by Mill Brook. Both discharge to Oyster Harbour and from there to King George Sound.
Both catchments are heavily cleared: around 66 per cent of the Kalgan and about 83 per cent of the King River catchment, with the King discharging at roughly 800 mg/L salinity. On the Kalgan there is a detail worth knowing before any model is built — a rockbar at the Upper Kalgan bridge separates the freshwater upper reach from the tidal lower one. It sets the downstream boundary condition for the lower river, and getting that control wrong is one of the more common ways an Albany flood assessment produces confident numbers that do not survive review.
Groundwater is managed formally here and it constrains surface water work. The Albany Groundwater Area has been proclaimed since 1973 across roughly 280 square kilometres of the coastal strip, with the unproclaimed Albany Hinterland covering a further 1,200 square kilometres inland toward Redmond, Napier and Manypeaks. The South Coast Water Reserve — proclaimed in 1968 and realigned in 2001 — and the Marbelup Brook drinking water source protection area both limit what can be done on the land above them. A drainage strategy drawn up without checking those overlays tends to meet them later, during assessment, at the worst possible time.
Fiord Group is a surface water practice rather than a general environmental consultancy — it does not do bushfire planning, flora and fauna survey, or soil testing for effluent disposal. For those, Albany is well served locally. Where the question is about flooding, catchment behaviour, drainage or hydraulic design, that is the whole of what this practice does.
Common questions
- Who does flood studies in Albany, Western Australia?
- Fiord Group prepares flood studies and flood impact assessments for Albany and the Great Southern from its base in Denmark, WA. Work includes 1% AEP assessments for development applications, calibrated catchment and floodplain modelling to Australian Rainfall & Runoff (ARR) 2019, and hydrological input to development and environmental approvals.
- Is there a hydrologist in Albany?
- Fiord Group services Albany from Denmark, about 55 kilometres west along the south coast. Principal Blake Marxsen (MIEAust, BEng Environmental Honours) is a hydrologist and environmental engineer specialising in surface water — flood hydrology, hydraulic modelling, drainage and surface water management.
- What is the difference between a hydrologist and a hydrogeologist?
- A hydrologist works with surface water — rainfall, runoff, catchments, rivers, flooding and drainage. A hydrogeologist works with groundwater — aquifers, bores, water table behaviour and groundwater licensing. Fiord Group is a surface water practice. If your question is about a bore, a groundwater licence or soil testing for effluent disposal, a hydrogeologist is the right call.
- Do I need a flood study for a development in the City of Albany?
- Generally when a proposal sits on or near a mapped floodplain, alters drainage or overland flow paths, or when the City or the Department of Water and Environmental Regulation (DWER) requests one as a condition of assessment. Requirements vary by site, and parts of the Albany area also sit under groundwater and drinking water source protection overlays that affect what a drainage strategy can propose.
- What does a flood study cost and how long does it take?
- It depends almost entirely on whether suitable terrain data and a calibrated model already exist for the catchment, and on the standard the assessing authority expects. The honest answer is that the scope has to be set against the specific site and the specific reviewer before a number means anything — which is a conversation worth having before you commission anything.
Sources
Every catchment figure on this page comes from a published agency record. Where two agencies publish different numbers for the same catchment, the more recent is used and the earlier is stated alongside it rather than quietly dropped.