Case Study - Lynbrook Estate
Background
Lynbrook Estate is a greenfield residential development approximately 35 kms south east of Melbourne in the city's major growth corridor. The estate is an 800 lot development, of 55 Ha, that incorporates WSUD principles adopted at the streetscape and sub-catchment scale. The Urban and Regional Land Corporation (URLC) is the estate developer and has been an enthusiastic party in the design and implementation of this project.
The bioretention system five years after installation
Several early stages of the Estate were designed with a conventional stormwater system. Lynbrook was subsequently chosen by the URLC for a WSUD trial after an approach by Melbourne Water to set up a demonstration project. Three stages of the development were initially approved by City of Casey as part of the demonstration project.
Lynbrook Estate is the first residential development in Melbourne to fully integrate some principles of WSUD.
The CRC for Catchment Hydrology (CH) is in the process of carrying out a 3 year monitoring program to compare the performance between the water sensitive and the conventional drainage systems atLynbrook. The study will look at the quantity and quality of runoff, as well as costs of construction, ongoing issues of maintenance and community acceptance of WSUD.
Lynbrook won the UDIA Presidents Award for its WSUD innovation. The Urban Land Corporation (ULC), Melbourne Water Corporation (MWC) and CRC CH received the National CRC Technology Transfer Award.
Aim
The design of the drainage system aims to attenuate and treat stormwater flows for the protection of the receiving waters.
The URLC is now planning for all remaining stages of Lynbrook to incorporate WSUD and is reviewing the design of stormwater systems in all its estates with a view to adopting WSUD as standard practice.
Technical Information
| Size of WSUD Site : | Less than 55 ha (Includes Stages 12- 14) |
|---|---|
| Average Lot Size : | 600 m2 (271 Lots) |
| Drainage System : | Roof and street runoff is directed towards WSUD treatment systems. Standard 16m road reserves applied. |
| Primary Treatments : | Grass swales and underground gravel trench system (0.6m .deep) collects, infiltrates and conveys road/roof runoff via a 150mm diameter perforated PVC pipe from local streets to the main boulevard. Main Boulevard acts as a bio-retention system with underground gravel filled trench and a 150mm perforated pipe which allows infiltration and conveyance. |
| Secondary Treatments : | Catchment runoff through wetland system prior to discharge into ornamental lake. |