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Protecting Water Resources with Higher-Density Development
Lynn Richards. 2006. EPA 231-R-06-001
DUA Ia
                                               4     0.3
                     Acres/100 units
                     ...
Tysons Corner, VA 1DUA
Houston, TX 4-5 DUA
8-9 DUA
Civano, Tuscon. 18DUA
New Orleans, French Quarter, 38 DUA
Dallas—Mockingbird Station, 64 DUA
199 DUA
Runoff Volume per acre versus DUA
               120,000


               100,000
                                        ...
Pollutant Load (lbs/year/acre)
            20
            18
            16
            14
                               ...
Runoff Volume per 100 units
                            90
cf ÷ 1000/100 units/ year


                            80
    ...
20%




                                            TN per 100 Units
                              120
      lbs TN/100 un...
upper
                 Water Quality Swales
                                           lower


                           ...
%Reduction Runoff Volume versus 4DUA
100%
 90%
 80%
 70%
 60%
 50%
 40%
 30%
 20%
 10%
  0%
        4    8     16    32   ...
% Load Reduction, Density vs. 4DUA
                         100%
Percent load reduction




                          90%
...
% Load Reduction for TN, Density versus 4DUA
                          120%
                          100%
% reduction ver...
Henry David Thoreau




Jennifer Lorenz
Impervious Cover Model
                  Good
 Stream Quality




                  Fair



                              ...
Impervious Cover Model
                  Good
 Stream Quality




                                                        ...
Impervious Cover Model
                 Good
Stream Quality




                                                          ...
John Jacob Handout
John Jacob Handout
John Jacob Handout
John Jacob Handout
John Jacob Handout
John Jacob Handout
John Jacob Handout
John Jacob Handout
John Jacob Handout
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John Jacob Handout

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John Jacob handout Gulf Coast Green Symposium 2009, Houston, Texas

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  • John,
    I was wondering where you got your numbers for slide 16. My data comes out very different.
    Thanks,
    Kelsey
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John Jacob Handout

  1. 1. Protecting Water Resources with Higher-Density Development Lynn Richards. 2006. EPA 231-R-06-001
  2. 2. DUA Ia 4 0.3 Acres/100 units 8 0.45 25.0 16 0.60 20.0 32 0.70 64 0.80 15.0 128 0.90 25.0 256 1.00 10.0 12.5 5.0 6.3 3.1 1.6 0.8 0.4 0.0 4 8 16 32 64 128 256 DUA
  3. 3. Tysons Corner, VA 1DUA
  4. 4. Houston, TX 4-5 DUA
  5. 5. 8-9 DUA
  6. 6. Civano, Tuscon. 18DUA
  7. 7. New Orleans, French Quarter, 38 DUA
  8. 8. Dallas—Mockingbird Station, 64 DUA
  9. 9. 199 DUA
  10. 10. Runoff Volume per acre versus DUA 120,000 100,000 256 128 cf/acre/year 64 80,000 32 16 60,000 8 40,000 4 20,000 - 0 50 100 150 200 250 300 DUA
  11. 11. Pollutant Load (lbs/year/acre) 20 18 16 14 TN lbs/year/acre 12 TSS/100 10 TP 8 6 4 2 0 4 8 16 32 64 128 256 DUA
  12. 12. Runoff Volume per 100 units 90 cf ÷ 1000/100 units/ year 80 70 60 50 40 30 20 10 0 0 50 100 150 200 250 300
  13. 13. 20% TN per 100 Units 120 lbs TN/100 units/year 100 80 60 40 20 0 4 8 16 32 64 128 256 DUA
  14. 14. upper Water Quality Swales lower upper Infiltration Practices lower TSS TP upper TN Stormwater Wetlands lower upper Stormwater Dry Ponds lower 0 20 40 60 80 100 120 BMP % Pollutant Removal, median, 25th and 75th percentiles National Pollutant Removal Performance Database, Center for Stormwater Protection, 2007
  15. 15. %Reduction Runoff Volume versus 4DUA 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 4 8 16 32 64 128 256 DUA
  16. 16. % Load Reduction, Density vs. 4DUA 100% Percent load reduction 90% 80% 70% TN 60% TP 50% 40% TSS 30% 20% 10% 0% 4 8 16 32 64 128 256 DUA
  17. 17. % Load Reduction for TN, Density versus 4DUA 120% 100% % reduction versus 4DUA 80% 60% High Ia 40% EMC Default 20% High EMC and Ia 0% -20% 4 8 16 32 64 128 256 -40% -60% -80% DUA
  18. 18. Henry David Thoreau Jennifer Lorenz
  19. 19. Impervious Cover Model Good Stream Quality Fair Urban Drainage Poor 10% 25% 40% 60% 100% Watershed Impervious Cover Center for Watershed Protection
  20. 20. Impervious Cover Model Good Stream Quality Urbanity Fair Urban Drainage Poor 0.001 0.1 2 40% 4 6 8 32 64 100+ 10% 25% 60% 100% Watershed Impervious Dwelling Units per Acre Cover Center for Watershed Protection
  21. 21. Impervious Cover Model Good Stream Quality Urbanity Fair Poor maximum repair—LID etc 0.001 0.1 2 4 6 8 32 64 100+ Dwelling Units per Acre

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