dc water 2013 02 20-divp-mag presentation
TRANSCRIPT
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District of Columbia Water and Sewer AuthorityGeorge S. Hawkins, General Manager
Briefing on:
Northeast Boundary NeighborhoodProtection Project
Briefing for:
McMillan Advisory Group
February 21, 2013
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Agenda
Mayors Task Force
Northeast Boundary NeighborhoodProtection Project (NEBNPP) Currently at Concept Design Stage
McMillan Stormwater Storage
First Street Tunnel
Channing St Mining Shaft Staging Area
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District and DC Water Commitments for NEBNPP
4 storms caused major
flooding: July 10, 18, 19
and Sept 2, 2012
Mayor formed Task
Force in Aug 2012
Task Force report
delivered end of Dec
2012
Over 25 Recommendations:
Engineering MeasuresRegulatory Code ChangesOperations &
MaintenancePublic
Outreach
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Flooding Has Been A Chronic Problem
Rhode Island Metro
1st & P St NW
1st & V St NWFlagler St NW
Rhode Island & 1st St NWRhode Island & T St NW
Rhode Island Ave Bet 1st & 2nd St
Rhode Island & T St NW
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What Is the McMillan Stormwater Storage Project?
Short term improvement Storage Capacity
Up to 6 Million Gallons
Construction Cost
Approximately $12M
In Service By
March 2014
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Phase I - Sand Removal Operation
Anticipated Start: Mid-February 2013
Extended Work Hours
Anticipated Duration:
Mid-March 2013
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Phase II Construction of Diversion Structures
Anticipated Start: June 2013
Anticipated Completion:
March 2014
Traffic Coordination withDDOT:
Ongoing
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First Street Tunnel Overview
V St
W St
Adams St
Bryant St
U St
Thomas St
Michigan AveN
1stS
tN.
Cap
St
23 Dia. Northeast
Boundary Tunnel
First Street Tunnel
19 Dia tunnel, 2,800
ft long, 6 mg storage
Temp.
Pumping
Station
Demolition of 2 sand
Filters required for
Construction
McMillanReservoir
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DC Clean Rivers
Tunnel Boring Machine
First Street Tunnel
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Tunnel Boring Machine(TBM) Constructs Tunnelfrom Below Ground
18.5 Feet Min. Inside
Diameter Over 100 Feet Deep
2800 Linear Feet
300 to 400 Feet ofTrailing Gear
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Channing Street Mining ShaftStreet Grade - Plan
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Channing Street Mining ShaftStreet Grade - Section
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Channing St Mining ShaftMaintain EL 170 - Plan
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Channing St Mining ShaftMaintain EL 170 - Section
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What Are The Project Schedules?
Proj. Activity 13 14 15 16 17 18 19 20 21 22
1 McMillan Stormwater Storage
2 First Street Tunnel
3 Northeast Boundary Tunnel
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Next Steps
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Historic Preservation Review Board Meeting March 28, 2013
Complete Design
Continue Public Outreach Program
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Questions?
Project EMail
NE Boundary Neighborhood Protection Project Website
http://www.dcwater.com/mcmillan
DC Clean Rivers Project Website
http://www.dcwater.com/cleanrivers
DC Clean Rivers Project Phone #
(202) 787-4447
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mailto:[email protected]://www.dcwater.com/mcmillanhttp://www.dcwater.com/cleanriversmailto:[email protected]:[email protected]://www.dcwater.com/cleanrivershttp://www.dcwater.com/mcmillanmailto:[email protected] -
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What Is The Clean RiversProject?
Clean Rivers Project: Control combined sewer overflows to: Potomac River Anacostia River Rock Creek
Meet nutrient discharge limits ofChesapeake Bay Program
Relieve flooding the Northeast BoundaryArea
Schedule: 2005-2025 Implemented under a Federal Consent
Decree among: United States Environmental Protection
Agency (US EPA) United States Department of Justice (US
DOJ) District of Columbia DC Water
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What Is A CSO?
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What Are The Benefits Of The Projects?
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100%
50%
20%
10%7%
4% 2% 1%0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
1 yr 2 yr 5 yr 10 yr 15 yr 25 yr 50 yr 100 yrProbabi
lityofOccurringinanyYear
6-hour Duration NOAA Storm Return Interval
Approx. capacityof current system
Capacity provided by short &medium term improvements
Capacity provided by long term improvements(Northeast Boundary Tunnel) Flooding is still
possible for larger
storms, but impact
will be greatly
mitigated.
1.86" 2.25" 4.66"4.05"3.72"3.33"2.84" 5.33"