IPWEAQ

The program will provide attendees with valuable design, construction and operational insight into sediment basins including the newly adopted Type A & B basins. Aspects covered will include how to size sediment basin varieties, how to select appropriate coagulants and flocculants, how to maximise basin performance and efficiency and how to adapt to constrained site conditions.

Attendees will gain an in-depth understanding of key design and operational parameters. The course will also provide guidance on construction and operation of Type A & B sediment basins, building on performance assessment and troubleshooting tools provided in the draft Appendix B document.

Each attendee will be supplied with a copy of a sediment basin sizing

tool as well as a jar testing kit to assist in selection and use of coagulants and flocculants. The presenters will provide insight based on experience

of designing and operating Type A, B & D basins to assist designers and operators in improving design and effectiveness of sediment basins whilst reducing risk and cost.

INTRODUCTION

• ‘Why’ sediment basin standards have changed
• ‘What’ are the current basin standards specified within various specifications and       guidelines and what do they mean for your site
• ‘What’ the change in standards mean (80th%ile five day event Vs 80%

     hydrological effectiveness)

• Overview of sediment basin options (Type A, B & D) to achieve new

     design standards

• Basin selection and design triggers

BASIN DESIGN 

• Process for sizing Type A, B and D sediment basins
• Designing basin inlet arrangements, including forebays and level spreaders
• Designing basin outlets, including decants, risers and emergency spillways
• Discussion of key design parameters to maximise performance and reduce                 potential for resuspension and short-circuiting, including clear water zone 

     and baffles

• Comparison of sizing for Type A, B and D basins

COAGULENTS AND FLOCCULANTS

• Coagulation and flocculation process
• Coagulant and flocculant types and effectiveness
• How to determine what to use (attendee exercise to perform jar tests)
• Active and passive dosing

BASIN OPERATION

• Dosing systems (rainfall activated Vs flow activated)
• Adaptive management and trouble shooting
• Retro fitting existing basins and storage structures
• Basin decommissioning

• Understanding of current construction

     phase sediment control standards, per updated SPP (Qld) and Appendix B

• Appreciation of design inputs and process for sizing Type A, B and D sediment          basins
• Ability to size Type A, B and D sediment basins using the sediment basin sizing        tool
• Understanding of key design consideration

     to maximise basin performance and efficiency, including basin configuration             and use of baffles and flow controls structures

• Improved knowledge of basin construction

     and operational aspects to improve effectiveness and reduce cost and risk

• Skills and tools to select coagulents and flocculants suitable for site conditions
• Ability to monitor basin performance

     and implement adaptive management to trouble shoot poor performance