Nutrient Reduction in the District of Columbia District Nutrient - - PowerPoint PPT Presentation

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nutrient reduction in the district of columbia district
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Nutrient Reduction in the District of Columbia District Nutrient - - PowerPoint PPT Presentation

Jan 12, 2024 291 likes •481 views

Nutrient Reduction in the District of Columbia District Nutrient Nitrogen 3,000,000 Loads 2,500,000 2,000,000 District planning target 1,500,000 addresses climate 1,000,000 change impacts 500,000 ~90% pollution is from -

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SLIDE 1

Nutrient Reduction in the District of Columbia

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SLIDE 2
  • District planning target

addresses climate change impacts

  • ~90% pollution is from

wastewater

  • Much progress already
  • Wastewater pollution will

increase with growth

  • Still more work to be

done to reduce stormwater pollution

  • 500,000

1,000,000 1,500,000 2,000,000 2,500,000 3,000,000 2009 2017 WIP2 Planning Target

Nitrogen

Wastewater Developed and Natural Planning Target

District Nutrient Loads

  • 20,000

40,000 60,000 80,000 100,000 120,000 140,000 160,000 2009 2017 WIP2 Planning Target

Phosphorus

Wastewater Developed and Natural Planning Target

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SLIDE 3

Blue Plains WWTP

  • $950 Mil enhanced nitrogen removal

completed in 2015

  • Meets effluent limit of 4.0 mg/L
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SLIDE 4

Combined Sewer System

  • 1/3 of the District
  • 3.2B gallons of

sewage and stormwater overflows annually (historically)

CSS MS4 MS4 MS4

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SLIDE 5

Clean Rivers Project

  • $2.6B+ capital project
  • Will reduce combined

sewer overflows by 96%

  • Anacostia Tunnel

completed in 2018

  • Final completion in

2030

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SLIDE 6

Stormwater Runoff

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SLIDE 7

Challenges Many Years in the Making

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SLIDE 8
  • Separate Storm Sewer Sys

 2/3 of District  Direct discharge without

treatment

 $7B + GI build-out

 $10 Mil/yr public funds for GI

CSS MS4 MS4 MS4

Stormwater Runoff

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SLIDE 9

Stormwater Improvements

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SLIDE 10

Stormwater Improvements

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SLIDE 11

Stormwater Improvements

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SLIDE 12

Revised Stormwater Regulations

  • Effective January 2014
  • Land-disturbing activities must retain the first 1.2”
  • f rainfall.
  • Interior renovation projects must retain the first

0.8” of rainfall.

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SLIDE 13
  • Free to go off site after achieving

50% of required retention on site.

  • Off site options include purchase of

stormwater retention credits of fee- in-lieu payments

=

Total

  • On-Site

Achieved

10,000 gallons 5,000 gallons

Off-Site Required

5,000 gallons

Practical Approach: Off-Site Flexibility

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SLIDE 14

Stormwater Retention Credits (SRCs)

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SLIDE 15

Program Results

  • GI is now standard practice
  • 39 SRC trades completed
  • Voluntary Private Investments

in GI

  • Over 4000 residential

properties retrofit

  • Over 3.8 Mil SF of green roof

installed

  • Forecast that 30% of MS4

impervious surfaces will be retrofit by 2040

  • Monitoring demonstrates

positive trends

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SLIDE 16

Upstream Sources

  • The District of Columbia

makes up only:

 0.5% of Potomac

River Watershed

 18% of Anacostia

River Watershed

 21% of Rock Creek

watershed

  • Pollution from beyond the

District impacts our waters

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SLIDE 17

Upstream Sources

  • Federal Partnerships

 Chesapeake Bay Program  Urban Waters Initiative  Federal Stormwater MOU

  • Regional coordination and collaboration to

ensure District programs and efforts are mirrored upstream – Council of Governments

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SLIDE 18

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QUESTIONS?

Jeffrey Seltzer – jeffrey.seltzer@dc.gov Stormwater Plan - dcstormwaterplan.org SRC trading - doee.dc.gov/src Stormwater management regulations - doee.dc.gov/swregs RiverSmart Programs - doee.dc.gov/riversmart