South Buffalo Creek Water Quality and Habitat Improvement Project

Transcription

1 South Buffalo Creek Water Quality and Habitat Improvement Project A Decade of Lessons Learned and Applied Using Adaptive Management and Design Jeremy McCall, P.E., CFM Greensboro, NC Water Resources Department Jeremy.McCall@greensboro-nc.gov Jennifer Murphy, P.E. Kimley-Horn Jennifer.Murphy@kimley-horn.com

2 Presentation Outline Project Background and Overview Construction of Phases I-III Repairs to Previous Phases Phase IV Lessons Learned

3 Project Background and Overview History and Project Goals Site Location and Acquisition Greensboro s Goals and Requirements Design Approach and Objectives

4 Clean Water Management Trust Fund Grant Applied for grants in 2008, 2012, 2013, 2014, and 2015 Awarded a total of $1,467,350!

5 The Original Plan: Three Phases Piedmont Creek " Phase I - Construction Completed 2013 W Meadwoview Rd Kersey Tributary South Buffalo Creek UT1 UT3 UT2 " " Phase III - Construction Completed 2015 Phase II - Construction Completed 2014 Phase Boundaries I-III Wetland Slough Bankfull Bench Structures Restored Centerlines Farragut St

6 Existing Floodplain Slough Wetlands

7 South Buffalo Constructed Slough Late Spring 2014 with sediment deposition Early Spring 2014 July 2018

8 Piedmont Creek Enhancement Piedmont Creek Map Spring 2014 Before construction

9 Kersey Tributary Relocation 3 months after construction Kersey Before construction W Meadwoview Rd Kersey Tributary Map South Buffalo Creek 5 years after construction

10 Piedmont Creek Repair During Phase IV October 2016 July 19, 2018 July 6, 2018

11 Kersey Tributary Repair During Phase IV Damage from beaver activity Immediately after repair

12 South Buffalo Creek Drainage area of 15 square miles Highly urban 30% to 35% impervious cover On 303(d) list as impaired biology (fish and benthos) Featureless bed form (poor habitat) Eroding banks

13 Incision of South Buffalo Creek Vegetated soil lift from previous phase Approximately 1.5 feet of incision from Phase III construction to Phase IV design Boulder once covered by stream invert

14 " Phase I - Construction Completed 2013 Phase IV! " W Meadwoview Rd Phase IV - Construction Completed 2018 Piedmont Creek Kersey Tributary South Buffalo Creek UT1 UT3 UT2 " " Phase III - Construction Completed 2015 Phase II - Construction Completed 2014 Structures - Phase IV Phase IV Project Boundary Phase Boundaries I-III Wetland Slough Bankfull Bench Structures - Phases I-III Restored Centerlines Farragut St

15 Incision of South Buffalo Creek Adjust profile with riffles and J-Hook structures Tie in to existing structures and bedrock Reduce channel width and construct benches

16 Inner Berm and Bankfull Bench Bankfull bench Inner berm bench

17 Rock Vane to Cross Vane with Riffle Existing vane Converted structure Urban fish habitat

18 Toe Wood Toe wood under construction Completed toe wood and bank grading South Buffalo Creek left bank looking downstream, immediately before construction of toe wood

19 Rock Toe Protection Before Phase IV Rock toe and bank grading

20 Log J-Hook with Constructed Riffle Constructed riffle Log

21 Lessons Learned Stump grave It takes a lot of staff! Don t be afraid of the big channel Include language for adjusting inverts in the field during construction Ensure structures are installed per the detail or find another way! If you build it, they will come Creative debris disposal.

22 Next Steps Final plantings Annual inspection by City Invasive species program Observation!

23 Questions? Jeremy McCall, P.E., CFM City of Greensboro, NC Water Resources Department 2602 South Elm-Eugene Street Greensboro, NC (336) Jennifer Murphy, P.E. Kimley-Horn 421 Fayetteville Street, Suite 600 Raleigh, NC (919)