Presentation on theme: "Slide 1 An Overview of the GWK Retention Treatment Facility and The August 11, 2014 Wet Weather Event August 19, 2014."— Presentation transcript:
Slide 1 An Overview of the GWK Retention Treatment Facility and The August 11, 2014 Wet Weather Event August 19, 2014
Slide 2 Overview Elements 1.Brief History of the GWK Drainage District and GWK Retention Treatment Facility 2.Design 3.Operations 4.August 11, 2014 Wet Weather Event 5.Next Steps
GWK Drainage System
GWK System Map
GWK System Map: Clawson Vicinity Towards GWK RTF
Slide 6 GWK RTF Design: Criteria The GWK RTF is a Pollution Control Facility that screens out sanitary trash and other solids and provides disinfection using chlorine before discharging to the Red Run Drain. Chlorine contact time and wet weather volume storage provided using the 124 Million Gallons of storage capacity available in the facility.
Slide 7 GWK RTF Design: Criteria Designed to address flows from a 10-year, 1-hour design event. Peak flow rate into the GWK RTF ≈ 3.1 Million Gallons per Minute (7,000 cfs). GWK RTF construction and upgrades were required to reduce Combined Sewage Overflows (CSOs) and be in compliance with MDEQ rules and the Federal Clean Water Act.
Slide 8 GWK RTF Design: Extent of Pollution Control Facility
Slide 11 August 11, 2014 Wet Weather Event: Event Statistics WRC has a network of rain gauges that provide rainfall depth from every wet weather event. Rain Gauge 0880 is located at the GWK RTF and is used to determine rainfall amounts for much of the GWK RTF service area.
Slide 12 August 11, 2014 Wet Weather Event: Event Statistics Rainfall frequency is determined by referencing published texts. At the time of the GWK RTF design “Technical Paper 40” was a reference text. Today. “NOAA Atlas 14” is the reference text.
Slide 15 August 11, 2014 Wet Weather Event: Comparison to Design Event
Slide 16 August 11, 2014 Wet Weather Event: Effect on GWKDD and RTF
August 11, 2014 Wet Weather Event: Effect on GWK RTF
Slide 18 August 11, 2014 Wet Weather Event: Effect on GWK RTF
August 11, 2014 Wet Weather Event: Effect on Red Run Drain Red Run at GWK Outlet (Dequindre)
August 11, 2014 Wet Weather Event: Effect on Red Run Drain Red Run at MoundRed Run at Van Dyke
Slide 21 August 11, 2014 Wet Weather Event: WRC Next Steps Collect community data from basement flooding Hydraulic study of the GWK facility
Slide 22 Oakland County Executive Office Announcement “The flooding impacted thousands of individuals who now have many questions about how to recover from this disaster. The Multi-Agency Resource Center (MARCs) will be an opportunity to meet with experts who can answer some of those questions.” – L. Brooks Patterson The Southfield MARC will be open 11 a.m. – 7 p.m. Wednesday and Thursday at the Southfield Pavilion, Evergreen Road south of the I-696 expressway.