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Natural Environment: 0% Impervious Surface Built Environment:

Published byCassandra Perry Modified over 6 years ago

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Presentation on theme: "Natural Environment: 0% Impervious Surface Built Environment:"— Presentation transcript:

1 DC Clean Rivers Project Overview: Why Stormwater is a Problem in DC and Other Cities
Natural Environment: 0% Impervious Surface Built Environment: 75-100% Impervious Surface Separate Sewer System

2 DC Water Overview: Sewer Systems in DC
*Discharge occurs when pipe’s capacity is exceeded

3 DC Water Overview: Where is the Combined Sewer System Located?
Combined Sewer System Covers 1/3 of the District (12,478 acres) 47 Active CSO outfalls 13 to Anacostia 10 to Potomac 24 to Rock Creek Three receiving waters Anacostia River Potomac River Rock Creek

4 DC Clean Rivers Project Overview: Magnitude of the Problem
CSO 017 Overflowing Trash in the Anacostia River Trash on Anacostia CSO 049 Overflowing 96% Reduction (DC Water Formed) Predicted Progress in Controlling CSOs

5 DC Clean Rivers Project Overview: Amended Consent Decree
CSO 049: Manage volume equal to 1.2” of rain falling on 365 impervious acres CSO’s 027, 028, 029: Manage volume equal to 1.2” of rain falling on 133 impervious acres CSO’s 025, 026: Separate sewers CSO’s : Control using Potomac River Tunnel

6 DCCR GI Implementation: What is Green Infrastructure?
Mimics natural water processes: Filtration, infiltration, slowing water, storage, and evapotranspiration Rain Gardens and Bioretention Downspout Disconnection and Rain Barrels Green Roofs Pervious Pavement

7 Green Infrastructure Overview: GI Technologies to be Constructed
GI Application in Right-of-Way Planter Bioretention Also known as a rain garden. Captures and cleans stormwater runoff allowing it to infiltrate into the ground before entering the combined sewer system. Curb Extension Bioretention Extension of the curb with bioretention that collects stormwater runoff and allows it to infiltrate in the ground. It also serves to calm traffic. Separate Sewer System

8 Green Infrastructure Overview: GI Technologies to be Constructed
GI Application in Right-of-Way Alley Permeable Pavement Also known as a green alley. Allows stormwater runoff to infiltrate through the pavement and into the ground before entering the combined sewer system. Parking Lane Permeable Pavement Parking lane permeable pavement allows stormwater runoff to infiltrate through the pavement before entering the combined sewer system. Separate Sewer System

9 Green Infrastructure Overview: Maintenance
Oglethorpe St NW Green Infrastructure Overview: Maintenance DC Water is responsible for maintenance of GI facilities. Anticipated GI maintenance activities (following construction) are listed below. Bioretention: Removal of trash, leaves, weeds, debris, sediment and animal waste- anticipated monthly Other activities may include (as needed): Cleaning of system and inspections Inspections for disease/pests and treatment Trimming of vegetation and plants Watering of vegetation Replacement of mulch, rocks and gravel Permeable Pavement: Vacuum sweeping- anticipated monthly (March-December) Removal of leaves, weeds and sediments Cleaning of underdrains and inspections Typical GI Facility Sign Note: Maintenance and repairs for traditional pavement will remain the District’s responsibility.

10 DC Clean Rivers Project Overview: Program Drivers
Volume Management (Gallons) Control Combined Sewer Overflows Cost Effectiveness Responsibility to Rate Payers Maintenance/Asset Management Safety Aesthetics Performance Outreach Build Public Awareness and Stewardship Triple Bottom Line Benefits Deliver Multiple Benefits to the Community Curb Extension Bioretention Planter Bioretention Permeable Parking Lane Permeable Alley

11 DC Clean Rivers Project Overview: GI Feasibility and Effectiveness
$14 M+ investment in GI TM 2 – Modeling TM 4 – District Experience TM 5 – Foreign Experience TM 6 – Technologies TM 7 – Screening Analysis Construct first GI project in Potomac and Rock Creek sewersheds Evaluate GI in terms of constructability, operability, efficacy, public acceptability and cost effectiveness Make determination regarding practicability of completing GI Prepare Program Plan (facility plan) Submit post construction monitoring report with determination (on sewershed basis) to EPA for approval GI is practicable GI is impracticable Rock Creek (Piney Branch) Potomac River Construct Potomac Tunnel at 40 mg instead of 30 mg, and intercept CSO 027, 028 & 029 Construct 9.5 mg storage facility Construct remaining GI projects Complete all projects by same end date (3/23/2030) with performance equivalent to LTCP

12 Other DCCR GI Projects: Kennedy Street Revitalization Project
Oglethorpe St NW Other DCCR GI Projects: Kennedy Street Revitalization Project DC Water has awarded over $2 million for construction of GI on the 100 block of Kennedy Street NW under the Kennedy Street Revitalization Project Benefits Manage stormwater to reduce CSOs into the District's waterways Improve traffic and safety conditions Contribute to the revitalization of the historic Kennedy Street NW Completion anticipated early 2018 More information: dcwater.com/greenchallenge

13 Other DCCR GI Projects: Drain the Rain!
Oglethorpe St NW Other DCCR GI Projects: Drain the Rain! Downspout Disconnection Program: Voluntary and free program with free rain barrel Timeline: Pilot Program completed Next Phase of Program continues in 2018 Canvassers will visits residents to promote program and determine eligibility beginning in March 2018

14 RC-A Project Overview: Green Jobs Update
DC Water has established a goal to have 51% of new jobs created by the GI project to be filled by GI Certified District residents The RC-A Contractor is meeting this goal by... Hiring 6 National Green Infrastructure Certification Program (NGICP) graduates Participating in Q&A sessions with NGICP candidates Hosting targeted interview sessions with NGICP graduates DC Water continues to champion NGICP by facilitating the bi-annual training sessions with, local training partner, University of the District of Columbia The 3rd training session was completed in Fall 2017 followed by the exam on November 14, 2017 NGICP Training Session – Fall 2017 NGICP Train-the-Trainer Session – Fall 2017

15 RC-A Kickoff Event - October 23, 2017
Questions RC-A Kickoff Event - October 23, 2017 Permeable Parking Lane – It Works!

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