The Working Paper classified natural resources into a number of categories, including bushland and wetlands. As to wetlands, it was noted that:
' ... only in latter years has the real value of certain natural features been recognised, and hence their subsequent incorporation into regional parks has occurred. Wetlands are perhaps the best example. Historically most were considered worthless as landscapes, having social value mainly as sites for market gardens around their peripheral margins. Their ecologies, revered by pre-european Aboriginal society, were neither understood nor appreciated by the colonial community at large except in a purely utilitarian sense. This has quite recently changed. Wetlands today are a principal focus of community concern with the region's environment. Hence, from alienated tenure following first settlement, many wetland environments are now being incorporated into new reserves and being acquired back into public ownership. Major portions of Lake Joondalup and the East Cockburn wetland chain for example, have only been reserved in the MRS and acquired by governments in the last two decades.'
Later in the Working Paper, there was a description of the wetlands and an explanation of their importance:
'The wetlands of the coastal plain are surface expressions of the groundwater table. They are numerous, varied in physical character and changeable in size and occurrence. Size varies from the largest such as Lake Joondabup at over 1km width or Lake Joondalup at +3kms in length, to the smallest swamps which sprinkle portions of the region in large numbers. Some are permanent with open water to 2m depth but most are shallow and lose their standing waters each summer as the water table drops and massive summer surface evaporation rates (3 metres per year) take their toll. Some 67% of 15,700 hectares of all wetlands on the Swan Coastal Plain are lost each summer in this way.
The wetlands are important because they are biologically the most productive environments of the plain. They are therefore a significant part of the region's ecology. They feature a diversity of vegetation in their waters, along their margins and on adjacent drier ground. Their function as waterfowl habitats and summer refuges for inland and migratory birds is recognised internationally.
The occurance [sic] of wetlands reflects the changing land form. Many occur in chains running parallel to the coast in association with the different dune systems. Hence wetlands of one type or another are found throughout the coastal plain, and as such represent an important opportunity for landscape interest and wildlife value.'
And later again:
'In the last 10 years the wetlands have gained great conservation interest. Although it is estimated that between 60 to 80 percent of the original stock of wetlands have disappeared, there still remains a large wetland resource. Wetlands located within the urban area have mostly been substantially modified, and inevitably so. Retention of wetlands in unchanged, natural condition requires almost total isolation from all surrounding land use. Even then regional changes in groundwater quality over the wide area can still influence the character and condition of a wetland.
The greatest risk to the overall capacity of the wetland system is that it will diminish due to excessive lowering of the water table. This could result from continued, unchecked pumping of water from the aquifer, particularly from private bores.
Another concern is that individual decisions will continue to be made to drain, fill in or clear the associated vegetation of small and ephemeral wetlands, especially those in rural locations. It is easy to compromise and attach little importance to the loss of any one wetland. But over a long period the cumulative effect may lead to a serious depletion of the total stock. The varied wildlife dependent on them, particularly waterfowl, will consequently diminish also.'
The Working Paper referred also to the geological setting of the Swan Coastal Plain:
'The coastal plain has been the focus for the majority of urban development in the region.
The plain is comprised of sedimentary rocks culminating in a geologically very recent series of dune systems running parallel to the coastline. These form the dominant but variable landscape character of the plain (Figure 2).
Nearest the coast are the most recent Quindalup and Spearwood Dune Systems. These are relatively fertile and exhibit the steepest terrain and most interesting topography of the plain. Midway occurs a broad band of Bassendean Sands. These are extremely infertile, higher in elevation (up to 60m AHD) and feature an open landscape with wide horizons.'
The Mount Lawley land is situated on the infertile Bassendean Sands. However, the Working Paper noted the importance of the northern banksia woodlands on the Bassendean Sands.
Reference was made also to the importance of groundwater in the Swan Coastal Plain, and in particular, the superficial or unconfined aquifer mentioned above: the Gnangara Mound:
'The larger Gnangara Mound to the north has a north south ridge rising to 70 metres AHD, a total volume of 65,000 million cubic metres and volume of stored water estimated at 13,000 million cubic metres. The southern, smaller Jandakot Mound has an elevation of 25 to 30 metres only and a storage capacity estimated at 5000 million cubic metres.
These two water bodies are not only principal sources of water for the urban population, but are essential components of the region's ecology. The vegetation and animals of the region are directly dependent upon the groundwater. They are also a dominant feature of the water balance of the region. Without their existence the coastal plain would be barely habitable.
Seepage from the aquifers supplies water into the few surface water courses that exist, and where the water table is exposed at the ground surface there occur the distinctive swamps and lakes of the plain.'