Property Plan – Location
The assessment for the property requires an accurate plan
of the property (scale 1 : 2000) and a district location. Certificate of Title or
Litho plan is useful.
Aerial Photos/Contour Plan
The latest aerial photos with 2 – 5 metre contour plans
are available from the Department of Land Administration –
Midland – Perth WA. They are an excellent base plan for property assessment.
Contour plans and stereoscopic coverage of the catchment
areas assist with the property assessment for catchment area,
topography, vegetation, natural features such as large rock outcrops, ridge lines, valley depressions. Land capability plans where available are used to assess soil types.
Surface & Sub Surface Flows
The information provided from the contour plans and the stereoscopic photos help to assess the potential winter surface runoff from
the catchment areas. The soil types and profiles are used for potential recharge
rates of the sub surface aquifers.
Agency Regulation & Requirements
The private and Government agencies involved in the hydrological
assessment of a property for subdivision include Property Planners,
Department of Water, Agriculture Department, Department of Environment and Conservation, Department of Planning and Infrastructure, Environmental
Protection Agency, Local Shires and Land Care Groups.
Potential Water Use
The water demand for property development is assessed from annual rainfall, potential crops, soil types, topography, location.
Water quality assessment is undertaken by an independent Laboratory
for Salinity, pH – acidic or alkaline, Iron content, chemicals,
nutrients and solids.
Different proposed property uses require different water quality.
E.g. Domestic or grey water, stock or irrigation demands.