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Floodplain Management and Restoration in Charlotte-Mecklenburg Dave Canaan Director – Water & Land Resources.

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Presentation on theme: "Floodplain Management and Restoration in Charlotte-Mecklenburg Dave Canaan Director – Water & Land Resources."— Presentation transcript:

1 Floodplain Management and Restoration in Charlotte-Mecklenburg Dave Canaan Director – Water & Land Resources

2 Storm Water Management CHARLOTTE-MECKLENBURG STORM WATER SERVICES Mecklenburg County SWS FEMA streams (> 1 sq. mi. watershed) County areas (pipes, swales, ditches) 5 of 6 towns (pipes, swales, ditches) City of Charlotte SWS Open systems (creeks & swales) Closed systems (culverts & pipes)

3 Background County Storm Water Major Streams – FEMA or mapped streams/river – Greater than 1 square mile drainage area – County wide Minor System – Less than 1 square mile drainage area

4 Background County Storm Water Partnerships ($1.8M) – City – NPDES Permit – BMP projects – Towns – NPDES Permit – Investigations, design and construction

5 Background Municipalities ($35M+/-) Minor System – Less than 1 square mile drainage area – Programs vary greatly Water Quality per CWA

6 County Vision A safe community A healthy community A livable community A prosperous community A well-governed community Priorities in Mecklenburg County:

7 Commitment at the Top The Little Sugar Creek watershed is one of the most severely polluted watersheds in North Carolina (NCDWQ Catawba River Basinwide Water Quality Plan pp to 4-27). "The County Commission herein finds that the public policy of Mecklenburg County is that our surface waters --- creeks, tributaries, ponds and lakes --- are a natural resource to be protected as a source of natural beauty and recreation. Further, that the use of our creeks, tributaries, ponds and lakes as a stormwater disposal method shall be secondary to the preservation of creeks, tributaries, ponds and lakes.

8 Multi-objective Floodplain Planning BOCC Adopted Initiatives; Floodplain Management Guidance Doc. (Dec 97) SWIM Initiative (Dec 99) Greenway Master Plan (1999) Flood Mitigation Plans (2003) All Hazards Plan (2005)

9 Charlotte-Mecklenburg Sugar Creek Little Sugar Creek HiddenValley

10 Watersheds / Basins 330± miles of FEMA streams 32 watersheds All water in Mecklenburg County (except Catawba River) originates in Mecklenburg County

11 Mission Reducing the potential for the loss of life and property due to flooding. Enhancing the natural and beneficial functions of the floodplain. Floodplain Management strives to build a Livable Community by:

12 Floodplain Management Goals & Objectives Mitigation/Restoration (Correction) PRESERVATION (Protection) PAST FUTURE PROJECTS ORDINANCES

13 County Storm Water Services Capital Program Three Components: Flood Mitigation Program Water Quality Program Engineering Program (Stream Restoration /Repairs)

14 PARTNERSHIP S Floodplain Management Partners

15 Floodplain Management Elements Creek Maintenance Rainfall / Stream Gauges Flood Information and Notification System Floodplain Remapping Customer Service Requests Stream Restoration Flood Mitigation Planning Floodplain Buyout Program

16 Maintenance Storm Water Operations Division Blockage Removal Encroachments / Notices of Violation Vegetation Management Acquired parcel maintenance

17 Floodplain Management Elements Creek Maintenance Rainfall / Stream Gauges Flood Information and Notification System Floodplain Remapping Customer Service Requests Stream Restoration Flood Mitigation Planning Floodplain Buyout Program

18 Rainfall / Stream Gauges PARTNER United States Geologic Survey (USGS)

19 Floodplain Management Elements Creek Maintenance Rainfall / Stream Gauges Flood Information and Notification System Floodplain Remapping Customer Service Requests Stream Restoration Flood Mitigation Planning Floodplain Buyout Program

20 Early Warning System

21

22 Floodplain Management Elements Creek Maintenance Rainfall / Stream Gauges Flood Information and Notification System Floodplain Remapping Customer Service Requests Stream Restoration Flood Mitigation Planning Floodplain Buyout Program

23 Re-Mapping : Flood Insurance Rate Maps (FIRM) Community Rating System (insurance discounts) :

24 Re-Mapping

25 Re-Mapping STUDY RESULTS Existing Conditions +2.0 feet Future Conditions +4.6 feet 3, ,000 structures in the floodplain

26 Floodplain Management Elements Creek Maintenance Rainfall / Stream Gauges Flood Information and Notification System Floodplain Remapping Customer Service Requests Stream Restoration Flood Mitigation Planning Floodplain Buyout Program

27 Service Requests Irwin Creek at I-77 FloodingErosionBlockages Property Damage

28 Floodplain Management Elements Creek Maintenance Rainfall / Stream Gauges Flood Information and Notification System Floodplain Remapping Customer Service Requests Stream Restoration Flood Mitigation Planning Floodplain Buyout Program

29 History Overview 1890s s: Catawba River dams Duke Energy 1910s s: creek dredging, widening drainage, irrigation, agricultural districts 1950s: chemical deodorizers Meck County Dept. of Environmental Protection 1960s : riprap engineering department present: soil bioengineering Storm Water Services

30 1890s s Catawba River dams - Duke Energy Series of 11 dams/reservoirs drinking water, hydro power, flood control, navigation created setbacks & buffers from water bodies swimming, fishing & recreation

31 1910s s US Army Corps of Engineers Creating navigable waters of the state & U.S. Dredge on Briar Creek

32 Dredge, Widen, Straighten Agricultural Districts better field drainage eliminated swamps & marshes no more groundwater recharge Drainage Work in Mecklenburg County circa 1911

33 Dredge, Widen, Straighten Old creek alignment for Little Sugar Creek New & improved alignment for Little Sugar Creek Sewer Department centralized collection & treatment, first WWTP, 1923

34 Dredge, Widen, Straighten Federal Funding North Carolina Emergency Relief Administration, 1936 Clearing Little Sugar Creek & tributaries Cleaning out Long Creek Clear & ditch Toby Creek Briar Creek drainage Drainage of McDowell Creek $16, $3, $95, $2, $3,447.10

35 1950s Chemical deodorizers should take of it! Meck County Dept. of Environmental Protection County streams had little aquatic life, minimal vegetative cover and strong odors.

36 1960s Riprap - King of the Queen City! Worked for just about any engineering solution Fixes the stream horizontally Environmental consequences of flush & gush werent understood Environmental movement was in its infancy Clean Water Act

37 Bio Engineering Irwin Creek (1998)

38 Natural Channel Design Hydraulic response ….. altered dimension A narrower thalweg forms in Briar Creek TWO months after placing SIX alternating rock vanes (2000). Briar Creek, August 12, 2000

39 Floodplain Management Elements Creek Maintenance Rainfall / Stream Gauges Flood Information and Notification System Floodplain Remapping Customer Service Requests Stream Restoration Flood Mitigation Planning Floodplain Buyout Program

40 Flood Mitigation Purpose Community Health and Safety Focus Area Reduce Injury

41 Flood Mitigation Planning History 1997 Floodplain Management Guidance Document 1999 Adopted original Watershed Plans 2000 Initiate Mitigation (Buyout) Program 2004 Adopted updated Watershed Plans 2004 Expanded Flood Mitigation Capital Program

42 Floodplain Management Elements Creek Maintenance Rainfall / Stream Gauges Flood Information and Notification System Floodplain Remapping Customer Service Requests Stream Restoration Flood Mitigation Planning Floodplain Buyout Program

43 Problem Definition Doral Apartments Briar Creek July 22-24, , ,000 structures in the floodplain

44 Problem Definition Myers Park Manor Briar Creek July 22-24, 1997

45 Flood Mitigation Accomplishments Years buildings removed from the floodplain (90% participate) 80 acres of deeded public open space Buyout Funding (Awarded) $14.1M - Federal Funds $1.7M - State Funds $8.9M - Local Storm Water Funds 35 additional buildings & 40 acres of open space within the floodplain through efforts with Real Estate Services

46 Buyout Program Issues Voluntary = No Condemnation Fair Market Value Prioritizing thru Mitigation Plans Demolition vs. Relocation Owners vs. Renters Hazardous Materials Vacant Land & What to Do With It

47 Buyout Area Westfield Road Brandywine Road Future Park Road Shopping Center (1956) Future Myers Park Manor (1951) Little Sugar Creek Future Woodlawn Road MyersParkManor Future Park Road Shopping Center (1956) MyersParkManor Little Sugar Creek ParkRoadShoppingCenter

48 Buyout Area

49 BEFORE Buyout Area AFTER High Water BEFORE - July 97 AFTER

50 Buyout Area Hidden Valley - Step 1 Property Acquisition (1) Fee Title (2) Deed Restriction (3) Voluntary (4) No Condemnation

51 Buyout Area Hidden Valley - Step 2 Structure Demolition (1) Relocation (2) Habitat for Humanity (3) Fire Dept. Training (4) SWAT Police Training

52 Buyout Area Hidden Valley - Step 3 Environmental Restoration (1) Environmental (2) Water-Oriented (3) Open Space / Re-Forested (4) Greenway / Recreational

53 Buyout Area Hidden Valley Eco-Restoration Wetland $1± million acquisition cost $1.2± million construction cost $940,000 CWMTF grant 1½ sq. mile watershed 17 homes purchased & razed greenway planned additional vacant land purchases additional funds from Wetlands Restoration Program

54 THANK YOU


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