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Kerry Centre - Beloit, WI

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Kerry Centre - Beloit, WI, Ryan Kloth

Nov 2010

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Kerry Centre - Beloit, WI

  1. 1. Kerry Centre-Beloit, WIStormwater Management and Floodplain Analysis Presented By: Ryan Kloth, P.E., CDT Presented At: WAFSCM Annual Conference – November 4, 2010 Copyright © 2010 Graef-USA, Inc. All Rights Reserved.
  2. 2. About the Speaker • Ryan Kloth, P.E., CDT – Member of Water Resources Group at GRAEF for 5 years – Specialties include: Hydrologic and Hydraulic Analysis, Floodplain Analysis, Stormwater Design, and Best Management DesignCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  3. 3. Discussion Summary • Project Details – Location, Permits – Stormwater Management Aspects – Hydraulics/Floodplain Management associated with Stream RelocationCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  4. 4. Location, Permits – City of Beloit, Wisconsin – 130 Acre parcel-SE corner of Interstate 43 and Interstate 90 – Construction for Proposed Conditions in two phases due to WDNR Chapter 30 permit requirements – Phase 1-Two permit packages – Phase 2-Construction packageCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  5. 5. Location, Permits – Package PP-1 – Paved parking areas – Building – Driveway connections to existing roadways – Stormwater Management Facilities – Floodplain Compensatory AreasCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  6. 6. Location, Permits – Package PP-2 – Completion of paved parking areas – Relocation of a portion of Spring BrookCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  7. 7. Location, Permits – Phase 2 – Ultimate, full build-out conditions – Potential development east of the current project consisting of additional building and paved surfaces. – 11.35 Ac. Of impervious area included with Phase 1 – Phase 2-23.60 acresCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  8. 8. Completed BuildingCopyright © 2009 Graef-USA, Inc. All Rights Reserved.
  9. 9. Ultimate Stormwater Conditions Copyright © 2009 Graef-USA, Inc. All Rights Reserved.
  10. 10. Proposed Stormwater Conditions Copyright © 2009 Graef-USA, Inc. All Rights Reserved.
  11. 11. Stormwater Management Aspects – Existing Conditions-Farmland – HSG B Soils north of Spring Brook; HSG C south of Spring Brook – Spring Brook-Tributary to Turtle Creek- Bisects site NE-SW – Location of Spring Brook and associated floodplain restricted development-Spring Brook relocatedCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  12. 12. Stormwater Management Aspects • Design Criteria – Quantity-City of Beloit-100-Yr Post to 10-Yr Pre – Quality-TSS 80% based on Ave. Annual Rainfall compared to no management runoff controls – Infiltration-Non-res development shall infiltrate 60% of pre-development infiltration volumeCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  13. 13. Stormwater Management Aspects • Design Criteria – Exempt from Beloit and NR 151 infiltration requirements based on existing soils and local groundwater depth in relation to proposed basins – However, provided bio-infiltration islands consisting of engineered soils and underdrain systems within green spaces of parking areas for treatment and storageCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  14. 14. Stormwater Management Aspects – Detention for Ultimate Conditions req’d a 3.6 ac-ft expansion of the wet detention basin east of the main bldgs in Phase I. – Wet detention basins-WDNR Conservation Practice 1001. – Prop. Cond-Pre-Dev-13.35 cfs/Post Dev- 8.41 cfs – Ult. Cond-Pre-Dev-28.25 cfs/Post-Dev- 14.60 cfsCopyright © 2010 Graef-USA, Inc. All Rights Reserved.
  15. 15. Stormwater Management Aspects – Water Quality-Proposed Conditions- 88%TSS removal from wet-detention and bio-infiltration – During Ultimate Conditions the amount of TSS removal was 89%Copyright © 2010 Graef-USA, Inc. All Rights Reserved.
  16. 16. Hydraulics/Floodplain Managementassociated with Stream Relocation – WDNR required hydraulic analysis to determine if elevations and velocities would increase – WDNR provided hydraulic model in 2007 – Proposed conditions hydraulic based on Kerry Centre design – Iterations performed to determine relocation cross-section-no impacts Copyright © 2010 Graef-USA, Inc. All Rights Reserved.
  17. 17. Hydraulics/Floodplain Managementassociated with Stream Relocation – 1400’ of Spring Brook relocated – Model provided by WDNR used to develop FIRM Map for the Turtle Creek Watershed; part of the Rock County floodplain study (1982) – Model revisions based on survey data Copyright © 2010 Graef-USA, Inc. All Rights Reserved.
  18. 18. Hydraulics/Floodplain Managementassociated with Stream Relocation – Model provided 10 and 100-year discharges; 2-year flows were not developed – 2-year flows; water surfaces required as part of Chapter 30 – 2-year was calculated using Conger (Regression Analysis) as detailed in Flood- Frequency Characteristics of Wisconsin Streams Copyright © 2010 Graef-USA, Inc. All Rights Reserved.
  19. 19. Stream Relocation DesignCopyright © 2009 Graef-USA, Inc. All Rights Reserved.
  20. 20. Proposed Floodplain/Floodway Copyright © 2009 Graef-USA, Inc. All Rights Reserved.
  21. 21. Proposed Floodplain/Floodway Copyright © 2009 Graef-USA, Inc. All Rights Reserved.
  22. 22. ACTION PLANEMERGENCY Hydraulics/Floodplain Management associated with Stream Relocation • With WDNR approval, we submitted to FEMA to obtain a CLOMR which was required for building occupancy • LOMR will be applied for once building is complete Copyright © 2009 Graef-USA, Inc. All Rights Reserved.
  23. 23. Thank you! Questions?Copyright © 2009 Graef-USA, Inc. All Rights Reserved.

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