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 Visitwith

Shandong Province Department of Housing and Urban Rural Development

October 24, 2016

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Maintenance and Stormwater Management Division/DPWES

Agenda 会议日程

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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

4Maintenance and Stormwater Management Division/DPWES

Fairfax County, Virginia 费尔法克斯郡地图Stormwater Management in Fairfax County, Virginia


Fairfax County, Virginia Overview 费尔法克斯郡概览Fairfax County Overview

• 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


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Growth following WWII 二战后人口增长

SWM (1973)

BMPs (1993/1994)

Occoquan Watershed BMPs (1982)

Infrastructure (1950’s)

GI

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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)


Maintenance and Stormwater Management Division/DPWES 8

• 2014 Impaired List is 105

17 Streams1 Reservoir

6 Tidal Embayments24 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


Maintenance and Stormwater Management Division/DPWES 9

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%

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Inventory – By Maintenance Responsibility 辖区设施 - 按维护责任

68%

32%

6,204 SWM/BMP/LID Facilities

Private (4,236)

Public (1,968)公共的私有的

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Inventory – By Type 辖区设施 - 按设备种类Private Facilities by Type Public Facilities by Type

BR13%

FB0%DP

13%

GR0%MB

4% PL1%PP0%RF0%

RT10%

SF5%

TF5%

TR28%

UG13%

0%1%

0%WP7%

BRFBDPGRMBPLPPRFRTSFTFTRUGVFVSWLWP

AS0%

BR5% CS

0%

DP70%

0%0%

GR0%

1%

OS0%

PP4%

RF1%

RT0%

SF0%

TF8%

TR3%

UG4%

VS2%

WL0%

WP1%

ASBRCSDPFC-PL566FTWGRMBOSPPRFRTSFTFTRUGVSWLWP

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Inventory – by Owner Type 辖区设施 - 按所有者种类Type

Private Residential

Total Private

Res PublicPrivate

Non Res TOTALIndiv 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

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Inventory – Conveyance 辖区设施 - 输水设备 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

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PL566 Flood Control Facilities 洪水控制设施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)

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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

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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 .

A Fairfax County, VA, publication

Department of Public Works and Environmental Services

Working for You!

Partnership with FCPSProject No. SD-000031-039Providence 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

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George C. Marshall High School Rainwater Harvesting Project


Project Detail 项目详述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

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Project Site – Tax Map No. 039-2 项目地点

Cistern Location

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Cistern Installation 贮水池安装

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Irrigation Installation 灌溉系统安装

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Pump and Treatment System Installation 泵和水处理系统安装

Pre Treatment System 预处理系统

Pump & Disinfection System水泵和消毒系统



Before 工程前 After 工程后

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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.

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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

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Metrics – Maintenance Unit Costs 度量 - 维护成本

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

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Conveyance Pre-Lining Pipe Conditions 维修前输水管状况

Waldo Dr, Dogue CreekLee District

Fort Hunt Rd, Little Hunting CreekMount 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

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Conveyance System Projects 输水系统工程

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.

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FY14 Conveyance System Projects 2014 财年输水系统完成工程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 CtAltura Ct Duncraig Ct Purple Beech DrAnson Ct Dusty Wheel Ln (2) Quietway CtAppledore Ct Easton Dr (2) Quincy AdamsArbor Glen Way Fort Hunt (4) Ravensworth RdAriel Way Freetown Dr Ronald StBachan Ct Frye Rd Saint Trinians CtBeech Tree Dr Gunsmith Sq Sanford CtBirchlake Ct (2) Gwynedd Way (2) Sanibel CtBirchtree Ct (2) Harwood Ct (2) Shaker Dr (2)Bluestone Ct Henderson Ct Shannon CtBluestone Pl Hobart Ct Skokie LnBrian Jac Ln Holly Leaf (7) South BayBristow Dr (2) Horton Hill Rd SouthamptonBrockham Dr Hughes Ct (2) Southgate Sq (3)Buffalo Trace Hunters Square Ct Southridge DrBurnside Landing Dr Indian Run Pkwy (3) Spinning Wheel CtCampus Commons Dr John Eppes Rd (3) Springhouse PlCandlewood Dr Kerns Rd Squiredale SqCastle Rock Sq Lee Highway Still Meadow Rd (3)Cedar Chase Rd Lofty Heights Swinks CtCedarlake Ct Lt Nichols Ct Sycamore Valley DrCentral Park Ci MacArthur Dr (4) Terrymill DrCentreville Rd Matera St The Midway (3)Centrillion Dr Mauck Ct (2) Thomas AshleighChestnut Hill Av Mock Orange Ct Valley Mill CtCheviot Dr (2) Mount Olive Ct Venice St (2)Chimney Wood Ct Murray Ln (2) Wagon Wheel Rd (2)Clara Barton Ct (2) Northgate Sq WaldoClermont Dr Northwind Dr Water St (2)Coleraine Ct (2) Old Stage Rd Waters EdgeColts Neck Rd Olney Rd Willet DrConcordia St Ordinary Ct Winstead LnCoopers Ct Overbrook Woodlawn LnDartford Dr (2) Perch Pl Woodside RdDaviswood Dr Picot Rd Yvonne's Way

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Completed Projects FY09- FY15 2009 - 2015 财年总完成工程

PracticesNumberInstalled TN TP TSS

Stream Restoration30 $ 2,100 $ 17,800 $ 53

Pond Retrofits55 $ 5,000 $ 92,200 $ 48

Dry Swales14 $ 8,280 $ 92,300 $ 135

Infiltration Swales & Trenches7 $ 10,000 $ 93,000 $ 124

Bioretention (Rain Gardens)33 $ 24,700 $ 203,000 $ 268

Pervious Pavement14 $ 50,600 $ 437,000 $ 569

Capital Cost ($/lb)

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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

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Stream Restoration - Wakefield Run 河道整修 - 案例 2

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Stream Restoration - Government Center 河道整修 - 案例 3

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Outfall Restoration – Crestleigh Way 排水口整修 - 案例 1Before & AfterCompleted 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

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Outfall Restoration – Lenox Drive 排水口整修 - 案例 2Before & AfterCompleted 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

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Outfall Restoration – Peppercorn Drive 排水口整修 - 案例 3

Before & AfterCompleted 8/12/15



Outreach – Schools 外展服务 - 学校

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http://www.fairfaxcounty.gov/dpwes/publications/stormwater/stormy_book_2_ada.pdf

http://www.fairfaxcounty.gov/dpwes/publications/stormwater/stormy_book_1_ada.pdf

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

http://www.fairfaxcounty.gov/dpwes/stormwater/maintenance/




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


http://www.fairfaxcounty.gov/dpwes/stormwater/maintenance-training.htm

http://www.fairfaxcounty.gov/dpwes/stormwater/maintenance-training.htm



Questions / Comments?问答环节

Maintenance and Stormwater Management Division, DPWES


Thank You 谢谢 !Chad Crawford, DirectorMaintenance & Stormwater Management Division10635 West Dr., Fairfax, VA 22030Direct: (703) 877-2800Email: [email protected]

Karlee Copeland, ChiefStormwater Management BranchMaintenance & Stormwater Management Division10635 West Dr., Fairfax, VA 22030Direct: (703) 877-2859Email: [email protected]

Charles Smith, ChiefWatershed Projects Implementation BranchStormwater Planning Division12000 Government Center Pkwy., Fairfax, VA 22035Direct: (703) 324-2467Email: [email protected]

Todd Nelson, Project ManagerStormwater Management BranchMaintenance & Stormwater Management Division10635 West Dr., Fairfax, VA 22030Direct: (703) 877-2877Email: [email protected]

Michael Allen, Safety AnalystMaintenance & Stormwater Management Division10635 West Dr., Fairfax, VA 22030Direct: (703) 877-2889Email: [email protected]

Ta-En Huang, EngineerStormwater Infrastructure BranchMaintenance & Stormwater Management Division10635 West Dr., Fairfax, VA 22030Direct: (703) 877-2849Email: [email protected]

Wen Wang, Programmer AnalystMaintenance & Stormwater Management Division10635 West Dr., Fairfax, VA 22030Direct: (703) 877-2836Email: [email protected]

Val Tucker, ChiefStormwater Infrastructure BranchMaintenance & Stormwater Management Division10635 West Dr., Fairfax, VA 22030Direct: (703) 877-2843Email: [email protected]

Matthew Kaiser, Public Information OfficerDirector’s OfficeDep. of Public Works & Environmental Services12055 Government Center Pkwy., Fairfax, VA 22035Direct: (703) 324-8255Email: [email protected]

mailto:[email protected]









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