Making a difference with
in the ground projects

City Storm Water Projects



Andover
Edwards Branch
County Storm Water


Hidden Valley Ecological Garden
Westfield Stream Restoration
Andover Storm Drainage Project


446 Acre Drainage Area
Problems:




20+ structures subject to flooding
7 roads subject to flooding
Pipe failures
Goal: Reduce structural and road flooding
and replace deteriorating pipe systems.
Andover Storm Drainage Project
Andover Storm Drainage Project

Phase I



Phase II



Constructed 2002
Total Cost - $1.4 million (Construction $1.0 million)
Constructed 2006
Total Cost - $7.2 million (Construction $5.2 million)
Phase III


Construction began Fall 2007
Total Estimated Cost - $5.4 million (Construction $3.0
million)
Andover Storm Drainage Project

Installation of 3-sided box culvert (14 x 8)
Andover Storm Drainage Project

Boring under Wendover Road (60-inch pipe)
Andover Storm Drainage Project
Grading and Seeding after installation of
two 60-inch pipes under Vernon Drive.
Edwards Branch Project








Watershed approach to storm water management
One square mile watershed
Fully developed – residential, some commercial
Structural BMPs – Wetland, Detention Basin
Stream restoration and buffer preservation
Mitigation Credit – Stream and Watershed Credits
Public education and involvement
Total cost: $3.8 million
Edwards Branch Project






Amenities for the neighborhood
Coordination with parks and schools
Monitoring BMPs and watershed to measure
success
Results promising, meeting watershed TSS targets
Future phases of Project considering additional
stream restoration and BMP opportunities
Continue monitoring to measure long-term benefits
Edwards Branch Project
#
#### #
##
#
## #
Edwards
Branch
Watershed
##
#
## #
#
#
#
#
#
##
#
#
#
#
#
###
#
#
#
##
##
##
BMP Sites
for
Field Review
#
500
##
0
500 1000 Feet
Edwards Branch Project
Stormwater Wetland
Edwards Branch Project
Stream Restoration
Edwards Branch Project
Stream Restoration
Urban Stream Restoration
Little Sugar Creek
“Hidden Valley”
Project History/Goals



Hidden Valley
neighborhood plagued
by flooding problems
for decades
Little Sugar Creek
placed on 303d list for
impaired water quality
in 2000
County used FEMA
funds to purchase and
demolish 12 floodprone houses in 2001



Improve water quality
Improve aquatic and
terrestrial habitat
Provide educational
opportunity
Hidden Valley Project

Restoration Drainage Area



Collecting 1.5 square miles
30% impervious
Project Team (Funding/Design)


Storm Water Services
Clean Water Management Trust
Fund
Buyout
Design Highlights




1,500 linear feet stream restoration
3 wet ponds
6 wetland cells
9 pocket wetland cells
From the Ground…
…to completion




Buyout/Land Acquisition = $1.2 million
Design/Construction = $2.4 million
Total Cost = $3.6 million
Local funding = $600,000
Little Sugar/Hidden Valley
Urban Stream Restoration
Little Sugar Creek
“Westfield”
Project History/Goals



Myers Park Manor
neighborhood plagued by
flooding problems for
decades
Little Sugar Creek placed
on 303d list for impaired
water quality in 2000
County used FEMA funds
to purchase and demolish
65 flood-prone houses in
2001




Improve water quality
Provide greenway
connectivity
Improve aquatic and
terrestrial habitat
Provide educational
opportunity
Westfield Project

Restoration Drainage Area



Collecting 15.5 square miles
43% impervious
Project Team (Funding/Design)




Storm Water Services
County Park and Recreation
NC Dept. of Environment and
Natural Resources
Clean Water Management Trust
Fund
Buyout
Flood Plain Buy out
70 Structures
$12 Million
Design Highlights




5200 linear feet total reach length
3800 linear feet of greenway trail
3000 linear feet of new channel
7 BMP cells treat over 100 acres of runoff from minor
system
From the Ground…
…to completion






Stream, BMP and trail planning, design,
construction observation = $350,000
Stream/floodplain construction = $1.2 million
BMP construction = $600,000
Trail construction = $430,000
Total Cost = $2.58 million
Nearly ¾ local funding
BEFORE
AFTER
Little Sugar Creek/Westfield