Date: 10 December 2020, Thursday
Time: 1700 hours – 1900 hours (Registration starts at 1645 hours)
1. Lakeside Gardens: water treatment and flood mitigation design
By Mr Abby Ng, Deputy Director, Jurong Lake Gardens Development, National Parks Board
Synopsis
The 54 ha Lakeside Garden, bordering the western shore of Jurong Lake, celebrates water, the key characteristics of the site. A extensive suite of water treatment features are deployed to deal with stormwater runoff treatment from the surrounding catchment as well as from the park itself. These include the naturalisation of a concrete canal on site, maximising the use of vegetated and bioretention swale to treat storm water run-off and the use of cleansing wetlands to treat lake water for a children play area.
The Garden is also designed to be inundated during extreme storm events. The talk will also present the design of the landscape to deal with floods, and work with fluctuating lake water level to create landscape attractions.
2. ABC Waters design features at Bukit Timah First Diversion Canal
By Ms Poh Li Ping, Environmental Engineer/Deputy Project Manager Jacobs Engineering Singapore Pte Ltd
Synopsis
Bukit Timah First Diversion Canal was completed in the 1970s to alleviate flooding in Bukit Timah catchment area. The diversion canal is about 3.2 km long diverts the flow from Upper Bukit Timah area into Sungei Ulu Pandan. There are 2 main ABC Waters features nodes within the project, namely Holland Plain and Holland Green. These 2 nodes have successfully exhibited the functions of 4 different types of ABC Waters design features: vegetated swale, rain garden, sedimentation basin and surface flow constructed wetland. A vegetated swale and rain garden are grouped as a pair in the Holland Plain node, while a sedimentation basin and constructed wetland are designed as a treatment train at the Holland Green node. This is to maximize the effectiveness in improving the water quality of stormwater runoff while reducing the maintenance efforts. Apart from improving the quality of runoff, these features help in detaining the peak stormwater flow during a heavy downpour.
Jacobs Engineering will be sharing the experience gained from the Bukit Timah First Diversion Canal project. The design procedures based on ABC Waters design guidelines will be demonstrated. The implementation challenges faced by the project team will also be further elaborated in the presentation.
3. ABC Waters Design at The Woodleigh Residences and Woodleigh Mall
Synopsis
The Woodleigh Residences and The Woodleigh Mall is an up and coming Mixed-Use integrated development nestled within the future Bidadari estate. This development comprises of 11 residential towers with a total of 667 units, 3 levels of retail, the Bidadari Community Club and the Bartley Neighbourhood Police Centre. The challenge behind Woodleigh’s ABC Waters design was to treat runoff from at least 50% of the project’s site area.
The roof of the commercial podium on which 11 residential towers and communal facilities are designed upon serves as an expansive landscape deck that overlooks Alkaff Lake opposite the development. Runoff from this expansive deck and from the residential blocks are treated by ABC Waters Design Features strategically designed across this landscape deck. Besides contributing to the softscape design and bio-diversity of the development, stormwater runoff treated by these ABC Waters Design Features, using plants and soil media, improves the water quality prior to discharging it into Alkaff Lake.