Oratia Catchment Stormwater Asset And Cross-Section Survey
Fraser Thomas Ltd were engaged by Auckland Council to undertake a stormwater catchment survey for the Oratia district, Waitakere.
The scope of works included the surveying of cross-sections, bridge structures, inlet/outlet pipes and detention ponds. There were an estimated 530 features to survey.
Part of our brief was to also identify any additional feature that would affect the stormwater flood model while onsite. A significant number of new features were identified which increased the surveyed total to some 710 items.
A wide range of difficulties were encountered which included high foot bridges, wide and deep streams, access to private properties and heavy bush in the upper catchment.