25 Sep A hydrogeological investigation- Proposed development adjacent to RAMSAR wetland.
MYRUP FLY-IN ESTATE, Esperance, Western Australia.
A proposed fly-in residential estate to be constructed adjacent to Lake Warden RAMSAR wetland northeast of Esperance, required that a hydrogeological & hydrological investigation was undertaken.
THIS IS AN HISTORICAL PROJECT
Lake Warden is a RAMSAR designated wetland with high ecological values. The site development incorporates effluent treatment systems with disposal via on-site irrigation through a constructed wetland to treat the water and
remove/ reduce the nutrient and sediment load.
A site investigation determined the hydrogeological and soil conditions. Site soils are duplex type, comprising shallow soils overlying silty clays. The soils possess adequate infiltration capacity and depth to water to permit effluent disposal. Nutrient absorption rates in soils were estimated from the
Phosphate Retention Index (PRI) and Cation Exchange Capacity (CEC) of soils.
Brackish to saline unconfined groundwater is present at shallow depth beneath superficial dune sands, and also unconfined to semi-confined
groundwater within silty and sandy clays of the Pallinup Siltstone. Groundwater flow occurs to the southwest, discharging into Station & Mullet Lakes to the south.
Lake water is chemically similar to groundwater, although pH indicates that groundwater comprises only a minor portion. Surface water has a lower average turbidity, is oxygenated and low in nutrients.
Site run-off has been altered through the construction of roadways, however major drainage lines to the southerly wetlands are retained. Run-off volumes are estimated for various storm events.
A surface water feature is proposed at a topographic low through excavation of soils to form an engineered wetland. This will be beneficial in
improving the surface water quality discharged to the Lake Warden wetland through the removal of sediments and nutrients. A monitoring network was established to determine baseline conditions prior to development.
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