Pine Valley Country Club Stream Restoration:Phase 2 Proposal

Presented March 17, 2003

Greg Jennings, NC State UnivBarbara Doll, NC Sea GrantDave Bidelspach, NC State UnivDan Clinton, NC State UnivMac Haupt, NC WRPDave Mayes, City of Wilmington

Overview Goal: Improve the water quality, stability,

ecological function, and aesthetics of streams flowing through the Pine Valley Country Club

Location: Middle Branch of Hewletts Creek including approximately 3,300 feet of perennial stream channel

Purpose of Presentation:Describe proposed stream restoration projectSeek feedback on proposed stream

restoration, vegetated buffer enhancement, and stormwater management

NC Wetlands Restoration Program Established in 1996 to restore wetlands, streams and

riparian buffer areas for the purposes of improving: Water Quality Aquatic and Terrestrial Habitat Floodwater Prevention Pollution Prevention Overall Watershed Function

Through State resources the NCWRP can fund: design, permit acquisition, construction and long term management of the site.

Defining the Problem Watershed Issues:

Closed and impaired shellfish watersUrban stormwater runoffNutrient inputs resulting in algal bloomsSediment inputs Growth and developmentChannelized streams

Land Based Physical Impacts: Eroding stream channel = loss of golf course

property and loss of aesthetic values

Existing Stream Conditions Unstable eroding streambanks Poor water quality Poor vegetation (exotic species)

Project Objectives & Benefits

Stabilize streams on PVCC property Improve water quality in Hewletts Creek and

downstream shellfish waters Improve natural stream & floodplain functions Improve stormwater management & provide

additional water source for PVCC Establish native vegetation Improve stream crossings (culverts & bridges) Improve aesthetics of stream corridor

Stream Restoration

Adjust stream conditions based on reference reaches such that natural stream functions are improved:

Channel geometry modificationInstream structuresBank stabilizationRiparian vegetation

transports the water and sediment produced by its watershed

maintains its dimension, pattern, and profile while neither degrading nor aggrading

Rosgen, 1994

Stable Stream

Problems Water quality Habitat loss Floodplain functions Land degradation

Causes Channelization Land use changes Loss of buffer

Unstable Streams

BKF

Not Incised BHR = 1.0 ER > 2.2

Water Table

Stable Stream

BKF

BHR > 1.0 ER < 1.4

Incised Channel

Water Table

Priority 2 RestorationNew Stable Channel with Lower Floodplain

Bankfull BenchBKF

Incised Channel

Priority 2 RestorationPlan View

Top of Bank

New Excavated Channel & Floodplain

Top of Bank

Replace Old Channel Incised Channel

Pine Valley Golf Course Phase 1

Length = 1000 ft Construction Cost = $125,000 Completed May 2001

Proposed Schedule

Spring 2003: Complete design & permit applications

Summer 2003: Hire construction firm November 1, 2003: Begin construction January 2004: Complete construction February 2004: Plant streambanks & floodplain

What Can the Project Provide for PVCC? New stormwater pond can be used for irrigation New culvert replacements will provide vehicle

crossings New footbridge replacements Cart path relocations Fill soil used to enhance driving range drainage Ornamental plants (large trees & shrubs)

City of Wilmington Perspectives If NCWRP constructs this project:

Technique – stream restoration for mitigation credits Schedule – now Cost – paid by State (8,000,000 population)

If City constructs this project: Technique – stream restoration or other environmentally friendly

method Schedule – Council approval of Capital Improvement Budget;

$70+ M of identified needs; $500,000/yr of new projects Cost – paid by City (92,000 population)

If PVCC constructs this project: Technique – your choice as long it is permittable Schedule – based on priorities of the Country Club Cost – paid by members of the club (400 members -

$1500/member)