Engineering Design Manual - loudounwater.org

1 44865 LOUDOUN WATER WAY ASHBURN, VA 20147 TEL: | FAX: Engineering Design Manual Originally Adopted September 2010 October 2016 Edition Engineering Design Manual October 2016 Change Log This Engineering Design Manual was originally adopted in September 2010. From time to time, new editions are issued. During the life of an edition, limited revisions will be made and adopted. The table below lists the editions, with all revision dates. The date appearing in the footer of the each page reflects the current edition. Where a page has been revised since adoption of the full edition, the page s footer will list the date of most recent revision to that page.

2 Edition Dates of Components Chapters 1-9 Appendices A B C D E F G September 2010 Sept. 2010 Sept. 2010 Sept. 2010 (including figures dated Apr. 2010) Sept. 2010 Feb. 2012 Feb. 2012 Oct. 2012 Apr. 2013 Jul. 2013: UER form October 2013 Oct. 2013 Oct. 2013 Oct. 2013 Oct. 2013 Oct. 2013 Oct. 2013 Apr. 2014: Page 63- revised allowable leakage formula May 2016: figure W-20 October 2016 Oct. 2016 Oct. 2016 Oct. 2016 Oct. 2016 Oct. 2016 Oct. 2016 Oct. 2016 Oct. 2016 TABLE OF CONTENTS PAGE Engineering Design Manual October 2016 i Chapter 1: Loudoun Water s Role .. 1 MISSION .. 1 INTRODUCTION .. 1 A. Basis and Intent.

3 1 B. Limitations ..1 C. Legal Authority .. 2 D. Statement of Policy .. 2 E. Rates, Rules and Regulations .. 2 SERVICE AREAS .. 2 A. Central System .. 3 B. Landfill Water Service District .. 3 C. Community Systems .. 4 D. Systems Not Belonging to Loudoun Water .. 4 E. Private Facilities .. 5 F. Reclaimed Water .. 8 THE PLANNING & Engineering 9 PUBLIC INQUIRIES .. 9 INITIATION OF SERVICE .. 10 CONNECTION PERMIT .. 10 A. Work Requiring Loudoun Water s Connection Permit .. 10 B. Applying for a Connection 11 C. Fees and Charges .. 12 D. Installation and Inspections .. 14 E. Acquiring the Meter ..15 Chapter 2: Project Administration.

4 17 EXTENSION OF PUBLIC FACILITIES .. 17 A. Applicant to Furnish Facilities within the Development Area .. 17 B. Public Main Required at the Property Served .. 17 C. Public Gravity Sewer Required .. 17 D. Easements for Proposed and Future Extensions .. 18 E. Enlarged Facilities .. 18 F. Determining Project Scope .. 18 OFFSITE FACILITIES .. 18 A. Construction by Loudoun Water .. 19 B. Construction by Applicant .. 19 SPECIAL CONTRACTS .. 19 SERVICE TO DEVELOPED COMMUNITIES .. 19 A. Direct Funding by Users .. 20 B. Funding by a Public Body .. 20 AGREEMENTS .. 20 BONDING .. 20 A. Facilities Requiring 100% Guarantee.

5 21 TABLE OF CONTENTS PAGE Engineering Design Manual October 2016 ii B. Subdivision of Land .. 21 C. Multifamily, Commercial, or Industrial Site Plan .. 21 D. Reduction for Work Completed .. 22 E. Acceptance of Facilities .. 23 CURRENT CONSTRUCTION PLANS REQUIRED .. 23 CONSTRUCTION PERMIT .. 23 PRECONSTRUCTION MEETING .. 24 CONSTRUCTION .. 24 A. Notification .. 24 B. Approved Construction Plans .. 24 C. Protection of Existing Utilities .. 25 D. Safety .. 26 E. Responsible Supervision .. 26 F. Protection of New Work .. 26 G. Operations within VDOT Right of Way or Private Roadways .. 26 PROGRESS MEETINGS .. 26 FIELD Engineering .

6 27 INSPECTION .. 27 A. Progress Inspections .. 27 B. 27 C. Beneficial Use ..28 D. Final Inspection ..28 CONNECTION PERMIT .. 28 PROJECT CLOSEOUT .. 28 A. As-built Survey and Record Drawings ..28 B. Bond Release .. 29 C. Land Use Permit .. 29 D. Maintenance Bond Release .. 30 Chapter 3: Application and Plan Preparation .. 31 PURPOSE .. 31 LOUDOUN COUNTY PLANNING AND LAND DEVELOPMENT REFERRALS .. 31 APPLICATION PROCEDURES .. 31 A. Initial Application .. 31 B. Subsequent Submissions .. 32 C. Signature Sets .. 32 D. Easement Documents .. 32 E. Revisions to Approved Construction Plans .. 32 CALCULATION OF REVIEW FEES.

7 33 A. Pipeline Projects .. 33 B. Pumping, Treatment and Other Non-linear Facilities .. 34 LOCAL REVIEW AUTHORITY .. 34 A. Water .. 34 B. Wastewater and Reclaimed Water .. 34 TABLE OF CONTENTS PAGE Engineering Design Manual October 2016 iii REQUIREMENTS FOR CONSTRUCTION PLANS .. 34 A. Cover Sheet .. 35 B. Vicinity Map .. 35 C. Revision Block .. 35 D. Zoning Tabulations .. 35 E. Scale .. 35 F. North Arrow and Coordinates .. 35 G. Horizontal Control .. 35 H. Vertical Control .. 36 I. Property Identification .. 36 J. Easements .. 36 K. Topography .. 36 L. Natural Features .. 36 M. Manmade Features .. 36 N. Existing Utilities.

8 36 O. Proposed Site Work and Utilities .. 36 P. Plan and Profile of Water and Sewer .. 37 Q. Phased Work .. 37 R. Standard Notes .. 37 S. Standard Details .. 38 DIGITAL DATA .. 38 A. When Required .. 38 B. CAD Files .. 38 C. PDF Files .. 39 REVIEW PROCESS .. 39 A. Pre-application Conference .. 39 B. Reviews .. 39 C. Conferences During Design .. 39 Chapter 4: Water Distribution .. 41 41 A. Intent .. 41 B. Minimums .. 41 HYDRAULIC REQUIREMENTS .. 41 A. Flows and 41 B. Estimating Customer Demand .. 42 C. Sizing Transmission Mains .. 43 D. Sizing Distribution Mains .. 43 E. System Layout .. 44 F. Hydraulic Models.

9 44 LAYOUT OF PUBLIC WATER MAIN AND APPURTENANCES .. 45 A. Definitions .. 45 B. Plan View .. 46 C. Profile ..51 D. Easements .. 55 E. Corrosion Control .. 56 F. Miscellaneous .. 57 HYDRANTS .. 57 A. Plan View .. 57 B. Profile .. 60 TABLE OF CONTENTS PAGE Engineering Design Manual October 2016 iv C. Miscellaneous .. 61 WATER SERVICE CONNECTIONS AND METERS .. 61 A. Definitions .. 61 B. Water Service Connection .. 62 C. Metering and Meter Placement .. 63 D. Sizing Meters .. 64 E. Fire Service .. 67 F. Cross Connection and Backflow Prevention .. 67 INSTALLATION REQUIREMENTS .. 68 A. Excavation, Bedding and Backfill.

10 69 B. Acceptance Tests .. 71 C. Joining to the Active Water System .. 73 Chapter 5: Wastewater Collection .. 75 SCOPE .. 75 A. 75 B. Minimums .. 75 HYDRAULIC REQUIREMENTS .. 75 A. Tributary Population .. 75 B. Flow Projections and Capacities .. 76 C. Hydraulic Design Criteria .. 78 PUBLIC SEWER LAYOUT .. 79 A. Definitions .. 79 B. Plan View .. 79 C. Profile ..82 D. Easement ..83 E. Miscellaneous .. 84 MANHOLES .. 84 A. Plan View .. 84 B. Profile .. 85 SEWER SERVICE CONNECTIONS AND BUILDING SEWERS .. 86 A. Definitions .. 86 B. Plan View .. 87 C. Profile .. 89 D. Metering As Basis of Continuing Sewer Service Charges.