Stormwater Management Information Sharing with Shandong Province, China

A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Stormwater Management in Fairfax County, Virginia
Information Sharing Visit
with
Shandong Province Department of Housing and Urban Rural Development
October 24, 2016

Maintenance and Stormwater Management Division/DPWES
Agenda 会议日程
2

Today’s Presentation… 内容提要
• Fairfax County Overview
• Regulatory Program Drivers
• Stormwater Management
Inventory
– Rainwater Harvesting
– Infiltration Practices
• Maintenance
• Stream Restoration
• Outreach and Education
• Discussion
3

Fairfax County, Virginia费尔法克斯郡地图
4

Fairfax County, Virginia Overview费尔法克斯郡概览
Fairfax County Overview
5
• Washington, DC metropolitan area
• 400 square miles
• 30 Watersheds
– Chesapeake Bay Watershed
• 1.1 Million residents
• Phase 1 Municipal Separate Storm
Sewer System (MS4) Permittee
• Permit (VA0088587) became
effective April 1, 2015

Growth following WWII 二战后人口增长
6
SWM (1973)
BMPs (1993/1994)
Occoquan Watershed BMPs (1982)
Infrastructure (1950’s)
GI

Regulatory Program Drivers 联邦, 州, 本地法规
• Corresponding Federal Regulations:
– Clean Water Act
– Chesapeake Bay TMDL
• Corresponding State Regulations:
– Virginia Pollutant Discharge Elimination System Permit
Program (VPDES)-VDEQ
– Virginia Chesapeake Bay Preservation Act (9VAC25-830)
– Virginia Erosion and Sediment Control (9VAC25-840)
– Virginia Stormwater Management Program (VSMP)
(9VAC25-870)
• And Corresponding Local Ordinances:
– Chapter 104: Erosion and Sediment (E&S) Control
– Chapter 112: Zoning Ordinance
– Chapter 118: Chesapeake Bay Preservation Ordinance
– Chapter 124: Stormwater Ordinance
– Local TMDLs (bacteria, sediment, PCBs)
7

Maintenance and Stormwater Management Division/DPWES 8
• 2014 Impaired List is 105
17 Streams
1 Reservoir
6 Tidal Embayments
24 Total Impaired Waters
Challenges - Local Water Impairments 挑战 - 受损水体持续增长
• 2014 Impaired List is 105
2004
Impaired
Waters
Fairfax County

Challenges - Local TMDLs 挑战 - 最大日负荷总量日益改善
• Bacteria WLA Reduction
• Upper Accotink Creek: 0.13 E+15 cfu/yr 92%
• Lower Accotink Creek: 1.73 E+12 cfu/yr 97%
• Bull Run: 7.61 E+10 cfu/yr 89%
• Difficult Run: 9.44 E+12 cfu/yr 90%
• Four Mile Run: 2.04 E+13 cfu/yr 98%
• Pope’s Head Creek: 6.83 E+11 cfu/yr 94%
• Sediment
• Bull Run: 4,096 tons/yr 78%
• Difficult Run: 3,595 tons/yr 32%
• Pope’s Head Creek: 1,571 tons/yr 28%
• PCBs
• Tidal Potomac: 54.7 g/yr 75%

Inventory – By Maintenance Responsibility 辖区设施 - 按维护责任
10
[CELLRANGE]
[CELLRANGE]
6,204 SWM/BMP/LID Facilities
Private (4,236)
Public (1,968)
公共的
私有的

Inventory – By Type 辖区设施 - 按设备种类
11
• Private Facilities by Type • Public Facilities by Type
BR
13%
FB
0%
DP
13%
GR
0%
MB
4%
PL
1%
PP
0%
RF
0%
RT
10%SF
5%
TF
5%
TR
28%
UG
13%
0%
1%0%
WP
7%
BR
FB
DP
GR
MB
PL
PP
RF
RT
SF
TF
TR
UG
VF
VS
WL
WP
AS
0%
BR
5%
CS
0%
DP
70%
0%0%
GR
0%
1%
OS
0%
PP
4%
RF
1%
RT
0%
SF
0%
TF
8%
TR
3%
UG
4%
VS
2%
WL
0%
WP
1%
AS
BR
CS
DP
FC-PL566
FTW
GR
MB
OS
PP
RF
RT
SF
TF
TR
UG
VS
WL
WP

Inventory – by Owner Type 辖区设施 - 按所有者种类
12
Type
Private Residential
Total
Private
Res Public
Private
Non Res TOTAL
Indiv
Lot
Subdivision
Outlot/Common
Area
Infiltration Practices (TR) 711 66 777 47 381 1,205
Bioretention (BR+TF) 320 137 457 252 256 965
Vegetated Swales 20 3 23 45 3 71
Filtering Practice (SF) 0 7 7 6 216 229
Constructed Wetland 0 1 1 0 1 2
Wet Pond 12 151 163 23 141 327
Dry Pond 0 15 15 1,357 516 1,888
Manufactured (Proprietary)
BMP 0 7 7 12 169 188
Other Types (Underground,
Rooftop, Porous Pavement, etc.) 3 13 16 194 1,037 1,247
TOTAL 1,066 400 1,466 1,936 2,720 6,122

Inventory – Conveyance 辖区设施 - 输水设备
13
62,000 storm drainage structures
1,300 miles of storm pipe
90 miles of man-made channels
1,600 publically maintained
stormwater management facilities
Inspections of 4,400 privately
maintained stormwater
management facilities
20 State regulated dams
No CSOs

PL566 Flood Control Facilities 洪水控制设施
14
State Regulated PL-566 Facilities
Storage Volume
(ac-ft)
Drainage Area (ac)
Barton 538 560
Braddock 428 554
Huntsman 1,489 1,560
Mercer 3,962 1,405
Royal 2,432 2,558
Woodglen 738 960
Total: 9,587 (ac-ft) 7,297 (ac)

Rainwater Harvesting – How They Work 雨水收集系统示意图
• Captures, diverts and stores
rainwater for later use. There are
six component of a rainwater
harvesting system:
获取, 分流, 储存雨水.系统由六部分
组成:
– Collection surface (roof or parking
lot) 收集层面(屋顶或停车场)
– Collection and conveyance system
(gutter/downspout) 收集和导流系
统(排水沟)
– Pre-screening and first flush diverter
预过滤和分流
– Storage tank 贮水器
– Distribution or outflow system 分配
流出系统
– Overflow, filter path or secondary
runoff reduction practice 溢出过滤
通道
15

Rainwater Harvesting – Maintenance雨水收集 - 维护
• Routinely inspect and repair deficiencies of structural components and connections of the RWHS
including tank, pump and pipes.
• An aboveground RWHS should be emptied prior to storm events, when possible, and disconnected
before winter.
• Gutters and downspouts should be checked twice per year to ensure they are free of leaves and other
debris.
• Inspect and clean pre-screening devices and first flush diverters four times a year.
• The condition of overflow pipes, overflow filter paths and/or secondary runoff. reduction practices
should be inspected yearly.
• The rainwater should not be used for irrigation if the roof has been treated for moss .
16

A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Partnership with FCPS
Project No. SD-000031-039
Providence District
December 10, 2014
George C. Marshall High School Rainwater
Harvesting Project
乔治马歇尔高中雨水收集工程

George C. Marshall High School Rainwater Harvesting Project
Project Detail 项目详述
18
Purpose:
• Onsite for water quality and quantity benefits – maximize the treatment of stormwater from
about 16.3 acres of school site.
• Harvest water for reuse on site to irrigate 8.7 acres of ball fields.
• Reduce stresses to the receiving stream – provide channel protection.
Project Overview:
• Installation of a 340,000 gallon underground cistern for stormwater harvesting.
• Installation of irrigation system for three ball fields.
• Installation of a pump system for irrigation.
• Installation of a UV disinfection system to treat water to ensure student safety
• Installation of storm drainage structures to divert flow to the cistern.
• Restoration of the site and installation of an access road for maintenance.
Benefits:
• Water quality benefits obtained include removal of 11.3 lbs./yr. total phosphorus, 81 lbs./yr.
total nitrogen, and 1,743 lbs./yr. sediments leading to the Pimmit Run.
• Water quantity benefits: 713,472 cubic ft. used onsite thereby improving downstream
condition of Pimmit Run
• Net saving of about $52K per year in use of potable water for irrigation

Project Site – Tax Map No. 039-2 项目地点
19
Cistern Location

Cistern Installation 贮水池安装
20

Irrigation Installation灌溉系统安装
21

Pump and Treatment System Installation 泵和水处理系统安装
22
Pre Treatment System
预处理系统
Pump & Disinfection
System
水泵和消毒系统

23
Before 工程前 After 工程后

Infiltration Practices – How They Work 渗滤实现示意图
• Replenish water and eliminate
the need for costly structures
and improvements to convey
runoff from the developed site.
• May not be constructed on fill
material or slopes steeper than
15%.
• Reduce the temperature of
urban streams.
– Encourage infiltration of
stormwater into the ground and
promote groundwater recharge;
– Stormwater travels underground
to the stream.
24

Infiltration Practices – Maintenance渗滤实现 - 维护
• Mow pretreatment devices such
as vegetated filter strips as
necessary and properly dispose
of the clippings
• Inspect pretreatment devices
and the facility at least twice
per year and remove sediment,
trash and organic debris as
needed
• Remove any plants and trees
from the facility as needed
• Replace pea gravel and topsoil
when clogged
25

Metrics – Maintenance Unit Costs 度量 - 维护成本
26

Conveyance System Reinvestment Options 输水系统再投资衡量
27
Repair 维修 Renew更新 Replace重建

Conveyance Pre-Lining Pipe Conditions 维修前输水管状况
28
Waldo Dr, Dogue Creek
Lee District
Fort Hunt Rd, Little Hunting Creek
Mount Vernon District
Adair La, Accotink Creek
Braddock District
Centreville Rd, Cub Run
Sully District
Separated
joints
Broken
pipe and
hole
Holes
and root
intrusion
Break-in
creates
voids and
cave-ins

Conveyance System Projects 输水系统工程
29
Before 维修前 After 维修后
Typical improvement to storm pipe by inserting the liners. The liners seal pipe separations and openings from
damage or corrosion, and restore structural stability to the deteriorating pipe material, extending the service life
by at least 50 years.

FY14 Conveyance System Projects 2014 财年输水系统完成工程
30
23,301 linear feet (4.4 miles) of storm sewer cured-in-place
pipe lining were completed during FY 2014 in several areas
within the County:
Adair Ln DeQuincey Dr Pinecrest (2)
Albot Rd Deerfield Pond Dr Puritan Ct
Altura Ct Duncraig Ct Purple Beech Dr
Anson Ct Dusty Wheel Ln (2) Quietway Ct
Appledore Ct Easton Dr (2) Quincy Adams
Arbor Glen Way Fort Hunt (4) Ravensworth Rd
Ariel Way Freetown Dr Ronald St
Bachan Ct Frye Rd Saint Trinians Ct
Beech Tree Dr Gunsmith Sq Sanford Ct
Birchlake Ct (2) Gwynedd Way (2) Sanibel Ct
Birchtree Ct (2) Harwood Ct (2) Shaker Dr (2)
Bluestone Ct Henderson Ct Shannon Ct
Bluestone Pl Hobart Ct Skokie Ln
Brian Jac Ln Holly Leaf (7) South Bay
Bristow Dr (2) Horton Hill Rd Southampton
Brockham Dr Hughes Ct (2) Southgate Sq (3)
Buffalo Trace Hunters Square Ct Southridge Dr
Burnside Landing Dr Indian Run Pkwy (3) Spinning Wheel Ct
Campus Commons Dr John Eppes Rd (3) Springhouse Pl
Candlewood Dr Kerns Rd Squiredale Sq
Castle Rock Sq Lee Highway Still Meadow Rd (3)
Cedar Chase Rd Lofty Heights Swinks Ct
Cedarlake Ct Lt Nichols Ct Sycamore Valley Dr
Central Park Ci MacArthur Dr (4) Terrymill Dr
Centreville Rd Matera St The Midway (3)
Centrillion Dr Mauck Ct (2) Thomas Ashleigh
Chestnut Hill Av Mock Orange Ct Valley Mill Ct
Cheviot Dr (2) Mount Olive Ct Venice St (2)
Chimney Wood Ct Murray Ln (2) Wagon Wheel Rd (2)
Clara Barton Ct (2) Northgate Sq Waldo
Clermont Dr Northwind Dr Water St (2)
Coleraine Ct (2) Old Stage Rd Waters Edge
Colts Neck Rd Olney Rd Willet Dr
Concordia St Ordinary Ct Winstead Ln
Coopers Ct Overbrook Woodlawn Ln
Dartford Dr (2) Perch Pl Woodside Rd
Daviswood Dr Picot Rd Yvonne's Way

Completed Projects FY09- FY15 2009 - 2015 财年总完成工程
31
Practices
Number
Installed TN TP TSS
Stream Restoration
30 $ 2,100 $ 17,800 $ 53
Pond Retrofits
55 $ 5,000 $ 92,200 $ 48
Dry Swales
14 $ 8,280 $ 92,300 $ 135
Infiltration Swales & Trenches
7 $ 10,000 $ 93,000 $ 124
Bioretention (Rain Gardens)
33 $ 24,700 $ 203,000 $ 268
Pervious Pavement
14 $ 50,600 $ 437,000 $ 569
Capital Cost ($/lb)

May 11, 2016
2011
2013 2015
Before
Stream Restoration – Bridal Path 河道整修 - 案例1

Stream Restoration - Wakefield Run河道整修 - 案例2
Before - Severely eroded stream banks After – Restored stream ties in nicely to the new Cross
County Trail bridge abutment repaired by FCPA
33

Stream Restoration - Wakefield Run河道整修 - 案例2
34

Stream Restoration - Government Center 河道整修 - 案例3
35

Outfall Restoration – Crestleigh Way 排水口整修 - 案例1
36
Before & After
Completed 9/14/15
- 2.12 lbs/yr reduction of Nitrogen
- 0.98 lbs/yr reduction of Total Phosphorus
- 1,861 lbs/yr reduction of Total Suspended Solids

Outfall Restoration – Lenox Drive排水口整修 - 案例2
37
Before & After
Completed 10/30/15
- 5.3 lbs/yr reduction of Nitrogen
- 2.4 lbs/yr reduction of Total Phosphorus
- 4,639 lbs/yr reduction of Total Suspended Solids

Outfall Restoration – Peppercorn Drive 排水口整修 - 案例3
38
Before & After
Completed 8/12/15

Outreach – Schools 外展服务 - 学校
39

Outreach - Maintenance Guidelines 外展服务 - 维护指导
http://www.fairfaxcounty.gov/dpwes/stormwater/maintenance/
40

Outreach - Maintenance Guidance外展服务 - 维护指导
Maintenance Contractor Training
– 31 contractors on the list.
– See http://www.fairfaxcounty.gov/dpwes/stormwater/maintenance-
training.htm for an attendance list
41

Questions / Comments?
问答环节
42

Maintenance and Stormwater Management Division, DPWES
Thank You 谢谢!
Chad Crawford, Director
Maintenance & Stormwater Management Division
10635 West Dr., Fairfax, VA 22030
Direct: (703) 877-2800
Email: Chad.Crawford@fairfaxcounty.gov
Karlee Copeland, Chief
Stormwater Management Branch
Direct: (703) 877-2859
Email: Karlee.Copeland@fairfaxcounty.gov
Charles Smith, Chief
Watershed Projects Implementation Branch
Stormwater Planning Division
12000 Government Center Pkwy., Fairfax, VA 22035
Direct: (703) 324-2467
Email: Charles.Smith@fairfaxcounty.gov
Todd Nelson, Project Manager
Stormwater Management Branch
Direct: (703) 877-2877
Email: Todd.Nelson@fairfaxcounty.gov
Michael Allen, Safety Analyst
Direct: (703) 877-2889
Email: Michael.Allen3@fairfaxcounty.gov
Ta-En Huang, Engineer
Stormwater Infrastructure Branch
Direct: (703) 877-2849
Email: Ta-En.Huang@fairfaxcounty.gov
Wen Wang, Programmer Analyst
Direct: (703) 877-2836
Email: Wen.Wang@fairfaxcounty.gov
Val Tucker, Chief
Stormwater Infrastructure Branch
Direct: (703) 877-2843
Email: Valerie.Tucker@fairfaxcounty.gov
Matthew Kaiser, Public Information Officer
Director’s Office
Dep. of Public Works & Environmental Services
12055 Government Center Pkwy., Fairfax, VA 22035
Direct: (703) 324-8255
Email: Mathew.Kaiser@fairfaxcounty.gov

Stormwater Management Information Sharing with Shandong Province, China

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