3. IMPERVIOUS AREA IN CITY OF LANCASTER
Roadway
Railroad 25%
Building
2%
41%
Parking
Lot
32%

4. IT’S BEEN FUN, BUT NOW…
Figuring out scale
Institutionalizing
-ordinance
-sustainable funding

6. EXAMPLE DEMONSTRATION PROJECT POROUS
PAVEMENT PLAY COURT: 6TH WARD PARK

7. 6TH WARD PARK UNIT COST COMPARISON

8. PARKING LOTS

9. PLUM STREET PARKING LOT

10. PLUM STREET

11. TOTAL
Parking Lot Drainage GI Area Capture Capital
Area Volume Costs with
Contingenc
y
Plum Street 23,402 4,680 511,000 $89,862
Dauphin 20,582 4,516 411,000 $61,822
Penn 22,758 4,219 455,000 $60,749
Mifflin 13,242 1,324 265,000 $27,013
TOTAL 1,642,000 $239,446
COST PER GALLON = $0.14/gallon

12. GREEN STREETS & ALLEYS

14. ALLEY 148: BEFORE

15. ALLEY 148: AFTER

16. HOW MUCH WE NEED TO MANAGE?
Assumed
Assumed
Impervious Total WQv or Average
Percent of Runoff
Green Infrastructure Project / Area SW BMP Annual
Area / Impervious Source Impervious Reduction
Program Type Managed Runoff Capture Runoff
Area (MG/yr)
(acres) (MG/yr) Volume Reduction
Managed
(in.)
Roads / Alleys Green Streets 30% 158.7 513 1.0 86% 132.4
Parks Park Improvements / Greening 85% 17.0 19 1.0 86% 14.2
Sidewalks Disconnection, Porous Pavement 35% 43.3 120 1.0 86% 36.1
Parking Lots Porous Pavement, Bioretention 20% 129.5 628 2.0 97% 121.3
Flat Roofs Vegetated Roofs 15% 32.7 212 1.0 86% 27.3
Sloping Roofs Disconnection/Rain Gardens 25% 163.5 635 1.0 86% 136.5
Street Trees Enhanced Tree Planting N/A 45.1 44 0.3 49% 21.5
Public Schools Green Schools 75% 38.4 50 1.0 86% 32.0
Various (Ordinance) First-Flush Ordinance 50% 637.0 1236 1.0 86% 531.6
Total 1,265 3,752 1,053
55%

17. PUT ANOTHER WAY…
Area/Impervious Assumed Percent
Source of Impervious Area
Managed
Roads/Alleys 30% 468 Blocks
Parks 85% 26 Parks
Sidewalks 35% 89 Miles
Parking Lots 20% 287 Parking Lots
Flat roofs 15% 246 Roofs
Sloping Roofs 25% 2,195 Buildings
Street Trees N/A 56,700 Trees
Public Schools 75% 15 Schools
Various (ordinances) 50% 2,536 non-residence
parcels

18. PARCEL VS. IMPERVIOUS AREA
Parcels Impervious Area
Residential Residential
Multi-Family Multi-Family
Non-Residential Non-Residential
14%
20%
11% 4%
75% 76%

19. OUR THANKS…
National Fish and Wildlife Foundation
Keith Campbell Foundation for the Environment
PA Department of Environmental Protection
PA Department of Conservation and Natural Resources
Lancaster County Planning Commission
Chesapeake Bay Commission
PENNVEST
And many individual donors…