ACESACES--PUB Seminar on Managing Urban RunoffPUB Seminar on Managing Urban Runoff

Date: 21 May 2014 (Wednesday) Duration: 2.00 pm to 5.30 pm Venue: LT301, NTU@OneNorth Campus 11, Slim Barracks Rise S 138664 Accreditation Points : PDUs TBC

ACES Member : $50/pax

Non-Member :

$80/pax

Overview of PUB’s Stormwater Management Strategies

Moving towards a holistic approach towards stormwater management for Singapore, PUB has made revisions to the Code of Practice on Surface Water Drainage. The changes include a requirement for developers to implement on-site measures to slow down surface runoff and reduce stormwater peak flows into the public drainage system. This is part of the source-pathway-receptor approach to stormwater management to build flexibility and adaptability into our drainage systems to cope with higher-intensity storms, where measures are taken at the areas where runoff is generated (i.e. the source), to the pathways through which stormwater flows (i.e. our drains and canals), and at areas where floodwaters may impact infrastructure (i.e. the receptors). Besides this new clause, there are also administrative amendments made to some existing clauses to enhance their implementation. These revisions have been effective since 1 June 2013, with the new Clause 7.1.5 Maximum Allowable Peak Runoff taking effect from 1 Jan 2014. PUB will be sharing on the holistic approach towards stormwater management and methods to control peak runoff including the design of detention tank systems, as well as the submission procedures for compliance.

Brought to you by:

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“Pathway” solutions

• Canal widening or deepening

• Diversion of waterways

“Receptor” solutions• Minimum platform and

crest levels• Flood barrier systems

Overview of Stormwater Management

“Source” solutions • On-s ite stormwater

detention features

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Overview of Stormwater Management

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• Detention features include:

– Detention tanks

– Retention ponds

– Wetlands

– Green roofs

– Planter boxes

– Bioretention basins or swales– Rain gardens

On-site Measures to Manage Peak Runoff

Underground detention tank schematic

Green roof

Rain garden

Planter boxes

Bioretention swale

Dry pond with underground retention tank

Implementation of ABC Waters Design Features – provide water detention & treatment

The Active, Beautiful, Clean Waters (ABC Waters) Programme is a long-term strategic programme spearheaded by PUB, Singapore’s national water agency. With an increasing area in Singapore becoming water catchments, PUB is adopting a sustainable stormwater management approach to detain and treat runoff closer to their source before discharging to nearby drains and waterways. PUB will share on ABC Waters design features such as bioretention systems, vegetated swales and rain gardens that use natural elements like plants and soil to achieve cleaner waters.

Besides improving water quality, the ABC Waters design features can also be integrated as part of stormwater management to detain runoff. To demonstrate ABC Waters design concepts in a precinct, PUB and HDB have embarked on a pilot project in Punggol East. This four-hectare pilot project at Waterway Ridges demonstrates how the collection, detention, treatment and conveyance of stormwater runoff can be integrated within a residential development at a precinct level. Besides maintaining the pre-development hydrology of the site for all storm events up to a ten years return period, the design features would also bring additional benefits to the community and the environment by improving runoff quality, creating multifunctional spaces, enhancing aesthetics and promoting biodiversity. PUB’s consultant for the project, Atelier Dreiseitl Asia, will present this as a case study.

Time Programme Outline Speaker Speaker Profile

2.00 pm Registration

2.30 – 3.00 pm

Overview of PUB’s Stormwater Management Strategies

Mr Chris Chow

Senior Assistant Director

Drainage Planning, Catchment & Waterways Dept, PUB

Mr Chris Chow is a Senior Assistant Director at PUB and is the Head of the Catchment Planning unit in the Catchment & Waterways department. He oversees the review of drainage policies, implementation of the Code of Practice on Surface Water Drainage, the screening process for Development Control/Building Plan submissions and overall drainage catchment planning for Singapore. He was also with the Best Sourcing Department previously where he oversaw the implementation of NEWater Pipeline, Water Reclamation Plant, ABC Waters and Drainage projects in Singapore.

3.00 – 3.30 pm

Design of Stormwater Detention Systems and Submission Procedures

Ms Joanne Siew

Senior Engineer Drainage Planning, Catchment & Waterways Dept, PUB

Ms Joanne Siew is a Senior Engineer with the Drainage Masterplanning unit within the Catchment & Waterways Department. She is involved in the development of the Drainage Masterplan for major waterways in Singapore and the review of drainage policies for long-term adaptability and resilience of Singapore’s drainage system. She was also part of the team that developed the Handbook on Managing Urban Runoff and the Technical Guide to On-Site Stormwater Detention Tank Systems.

3.30 – 4.00 pm

ABC Waters Design Features

Mrs Ong Geok Suat Principal Engineer ABC Waters, Catchment & Wa-terways Dept, PUB

Mrs Ong Geok Suat is a Principal Engineer at PUB and was involved in the ABC Waters Programme since 2007. She was instrumental in the formulation and implementation of ABC Waters Design Guidelines, ABC Waters Certification Scheme and ABC Waters Professional Programme. She has been actively involved in the pilot testing of ABC Waters Design features and the review of “Engineering Procedures for ABC Waters Design features”. She also initiated R&D work on soak away rain gardens, engineering soil and the precinct- scale ABC Waters pilot project at Punggol Waterway Ridges. Mrs Ong is also one of the trainers for ABC Waters Professional Programme organized by IES and Green Mark Manager Course organized by BCA.

4.00— 4.15 pm

Tea Break

4.15 – 5.00 pm

Sharing of case study by Atelier Dreiseitl Asia

Mr Tobias Baur

Tobias Baur AKBW, SILA Managing Director Singapore, Landscape Architect Before becoming director of Atelier Dreiseitl Singapore in February 2008, Mr. Tobias was a key member of the firm’s headquarters in Ueberlingen, Germany. During this time, he acted as both designer and project manager for several challenging, multi-faceted projects within Europe as well as Asia. To every project, he brings unique leadership abilities that have proven invaluable in organizing large consultant teams exceeding client expectations of design quality and time and budget management. With a focus on urban planning and design, Tobias offers particular expertise in areas of public open space design, urban waterways and their connection to the urban environment, natural river restoration, and sustainable design.

5.00 – 5.30 pm

FAQ panel session

ACESACES--PUB Seminar on Managing Urban RunoffPUB Seminar on Managing Urban Runoff Date: Wednesday, 21 May 2014, 2.00 pm—5.30 pm

Venue: LT301, NTU@OneNorth Campus

Closing date for Registration: 16 May 2014, 12.00 noon Fee: $50 (ACES Member); $80 (Non-member)

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