This item consists of an extensive tract of open space/parkland, with of wetlands, including Sydney Airport, The Australian Golf Course, Lakes Golf Course, Eastlakes Golf Course, Bonnie Doon Golf Course,
Astrolabe Park, and Mutch Park. Other areas of wetlands in the vicinity are substantially smaller in extent – the Eve Street wetlands, Arncliffe (south of Kogarah Golf Club) and the chain of ponds in Sir Joseph Banks Park, Botany. Important surviving elements of non-indigenous heritage include remnants of the water supply Engine House and
chimney (late 1850s) (no longer owned by Sydney Water); spillway/weir, remnants of the Engine and Mill Ponds; the sequence of ponds between the Mill Pond and Gardeners Road; 1915 Sewer Pumphouse; twin sewer syphons and easements; partial evidence of old Cooks River edge (evident through comparing early and recent aerial photography; 1869 plantings of
Norfolk Island pines (
Araucaria heterophylla), Moreton Bay fig trees (
Ficus macrophylla) and Port Jackson fig trees (
Ficus rubiginosa). Given the period, important government institutional use and the choice of tree species there is strong circumstantial evidence for the involvement of
Charles Moore – Director of the Royal Botanic Gardens (1848–1896) in advising on these plantings. Canary Island date palms (
Phoenix canariensis) also survive near the Engine Pond and may be remnants – or progeny – of 1910s plantings associated with the reuse of the site for the main southern sewer system. There is likewise strong circumstantial evidence for the involvement of
Joseph Henry Maiden – Director of the Royal Botanic Gardens (1896–1924) in recommending the choice of these plantings. A comparison of current aerial photographs and the Sydney Water Commission's 1869 topographic plan of the Lachlan Swamp from No 6 Dam to Botany Bay shows that there is a substantial degree of correlation between the layouts of many of the dams. Despite the bisection of the Engine Pond by Southern Cross Drive, it is still possible to appreciate the basic outline of the earlier pond. A similar observation holds for the former Bridge Pond as the present Mill Pond and the western half of the "New Pond" retain the earlier basic form. The embankment separating the Mill and New Ponds preserves part of the alignment of the old Sydney-Botany road (shown on the 1869 SWC plan) with its tollhouse site just south of the embankment. (Archaeological evidence of the former tollhouse may still exist.) The present Nos 1 and 2 Ponds closely reflect the earlier form of the 1869 No 1 Pond while most of the present Nos 3a, 3 and 4/5 Ponds almost exactly retain the earlier form of the 1869 Nos 2, 3, 4 and 5 Ponds respectively. The northern part of the old No 6 Pond has been filled. Generally, the present wetland layout retains a close indication of the original 1860s dam forms. Earlier pond formations existed some decades before, and were absorbed into, this system however surviving evidence is difficult to discern from both (non-intrusive) site inspections and an analysis of aerial photography. Archaeological investigations – if ever required – may reveal evidence of these early 19th century structures. A "Plan of the Botany & Lachlan Watersheds" signed by Francis Bell in June, 1875 shows that the Lachlan Water Supply (Centennial Park) links with the Botany Pond system as does the area of land containing the present Australian Golf Course. Several remnant areas of the famous and now rare
Eastern Suburbs Banksia Scrub (still featuring the trademark Grass Trees (
Xanthorrhoea resinosa) as well as various communities of reed and sedgeland species are represented within the open space boundaries. Other important indigenous vegetation vestiges include areas of Paperbark swamp featuring
Melaleuca quinquenervia, marshland and wet heath and large areas of the aquatic herb
Ludwigia. As at 21 May 2004, major elements (the sequence of ponds) of Sydney's third main water supply system are substantially intact. Particular elements of the system – its architectural and planted elements – are only partially intact.
Modifications and dates Although the pre-European wetland ecosystem was modified during the 1860s and 1870s pond construction, there has been only limited major modification – mainly for the expansion of the airport and construction of new arterial roadways – since then. Major elements (the sequence of ponds) of Sydney's third main water supply system are substantially intact. Particular elements of the system – its architectural and planted elements – are only partially intact. Yet the little that remains of these are particularly poignant and serve as important local landmarks. == Heritage listing ==