Holistic Watershed Management for Existing and Future Land
Use Development Activities: Opportunities for Action for Local
Decision Makers: PHASE 2 - FDC APPLICATION MODELING
(FDC2A PROJECT)
SUPPORT FOR SOUTHEAST NEW ENGLAND PROGRAM (SNEP)
COMMUNICATIONS STRATEGY AND TECHNICAL ASSISTANCE
Final Report Appendix D
Runoff Duration Curves for HRU-Scale SCM Modeling
Scenarios
September 30,2022
Prepared for:
U.S. EPA Region 1
Prepared by:
Paradigm Environmental Great Lakes Environmental Center
GleC
PARADIGM
ENVIRONMENTAL
Blanket Purchase Agreement: BPA-68HE0118A0001-0003
Requisition Number: PR-R1-20-00322
Order: 68HE0121F0052
-------
FDC 2A Project
Appendix D
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Figure 1. Flow duration curve with MS4 control of 30% of the Upper Hodges Brook subwatershed's impervious cover
under historic LULC and climate conditions (Scenario 1).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, no BMPs Ecosurplus: 2.18 cfs (515.0 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 2.18 cfs (513.3 MG/year)
Developed, no BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, no BMPs Ecosurplus: 2.18 cfs (515.0 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 2.17 cfs (510.8 MG/year)
Flow-Exceedance Percentiles
Figure 2. Flow duration curve with MS4 control of 80% of the Upper Hodges Brook subwatershed's impervious cover
under historic LULC and climate conditions (Scenario 1).
2
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
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Figure 3. Flow duration curve with MS4 control of 100% of the Upper Hodges Brook subwatershed's impervious cover
under historic LULC and climate conditions (Scenario 1).
Developed, no BMPs Developed, with BMPs Pre-Development
100
Developed, no BMPs Ecodeficit: 0.22 cfs (52.3 MG/year)
Developed, no BMPs Ecosurplus: 1.38 cfs (326.5 MG/year)
Developed, with BMPs Ecodeficit: 0.15 cfs (35.7 MG/year)
Developed, with BMPs Ecosurplus: 1.30 cfs (307.4 MG/year)
^ 10
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Flow-Exceedance Percentiles
Figure 4. Flow duration curve with MS4 control of 30% of the Upper Hodges Brook subwatershed's impervious cover
under historic LULC and future climate conditions (Scenario 2).
Developed, no BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, no BMPs Ecosurplus: 2.18 cfs (515.0 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 2.16 cfs (510.7 MG/year)
3
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs
0.1
Pre-Development
Developed, no BMPs Ecodeficit: 0.22 cfs (52.3 MG/year)
Developed, no BMPs Ecosurplus: 1.38 cfs (326.5 MG/year)
Developed, with BMPs Ecodeficit: 0.07 cfs (16.6 MG/year)
Developed, with BMPs Ecosurplus: 1.21 cfs (284.8 MG/year)
Flow-Exceedance Percentiles
Figure 5. Flow duration curve with MS4 control of 80% of the Upper Hodges Brook subwatershed's impervious cover
under historic LULC and future climate conditions (Scenario 2).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.22 cfs (52.3 MG/year)
Developed, no BMPs Ecosurplus: 1.38 cfs (326.5 MG/year)
Developed, with BMPs Ecodeficit: 0.05 cfs (11.4 MG/year)
Developed, with BMPs Ecosurplus: 1.18 cfs (278.4 MG/year)
Flow-Exceedance Percentiles
Figure 6. Flow duration curve with MS4 control of 100% of the Upper Hodges Brook subwatershed's impervious cover
under historic LULC and future climate conditions (Scenario 2).
4
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
Developed,
no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
—
—
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.02 cfs (4.6 MG/year)
Developed, with BMPs Ecosurplus: 1.93 cfs (456.1 MG/year)
—
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Figure 7. Flow duration curve with MS4 control of 30% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and historic climate conditions (Scenario 3).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 1.90 cfs (449.2 MG/year)
Flow-Exceedance Percentiles
Figure 8. Flow duration curve with MS4 control of 80% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and historic climate conditions (Scenario 3).
5
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
Developed,
no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
[—
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 1.90 cfs (448.5 MG/year)
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Flow-Exceedance Percentiles
Figure 9. Flow duration curve with MS4 control of 100% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and historic climate conditions (Scenario 3).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.21 cfs (49.1 MG/year)
Developed, with BMPs Ecosurplus: 1.94 cfs (457.7 MG/year)
Flow-Exceedance Percentiles
Figure 10. Flow duration curve with MS4 control of 30% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and future climate conditions (Scenario 4).
6
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
100
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Figure 11. Flow duration curve with MS4 control of 80% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and future climate conditions (Scenario 4).
Developed, no BMPs Developed, with BMPs Pre-Development
100
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Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.10 cfs (23.6 MG/year)
Developed, with BMPs Ecosurplus: 1.82 cfs (429.7 MG/year)
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.07 cfs (16.2 MG/year)
Developed, with BMPs Ecosurplus: 1.78 cfs (420.8 MG/year)
Flow-Exceedance Percentiles
Figure 12. Flow duration curve with MS4 control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and future climate conditions (Scenario 4).
7
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
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Figure 13. Flow duration curve with MS4 control of 30% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and historic climate conditions (Scenario 5).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.9 MG/year)
Developed, with BMPs Ecosurplus: 1.92 cfs (452.3 MG/year)
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 1.90 cfs (447.9 MG/year)
Flow-Exceedance Percentiles
Figure 14. Flow duration curve with MS4 control of 80% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and historic climate conditions (Scenario 5).
8
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
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Figure 15. Flow duration curve with MS4 control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and historic climate conditions (Scenario 5).
Developed, no BMPs Developed, with BMPs Pre-Development
100
to
<4-
V, 10
5
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LL.
1
0.1
0.01
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 1.89 cfs (446.6 MG/year)
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.18 cfs (41.9 MG/year)
Developed, with BMPs Ecosurplus: 1.91 cfs (450.4 MG/year)
Flow-Exceedance Percentiles
Figure 16. Flow duration curve with MS4 control of 30% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and future climate conditions (Scenario 6).
9
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.05 cfs (11.7 MG/year)
Developed, with BMPs Ecosurplus: 1.76 cfs (416.3 MG/year)
Flow-Exceedance Percentiles
Figure 17. Flow duration curve with MS4 control of 80% of the Upper Hodges Brook subwatershed's impervious cover
under future LULC and future climate conditions (Scenario 6).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.02 cfs (4.1 MG/year)
Developed, with BMPs Ecosurplus: 1.72 cfs (406.9 MG/year)
Flow-Exceedance Percentiles
Figure 18. Flow duration curve with MS4 control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and future climate conditions (Scenario 6).
10
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
Developed,
no Divirs tcoaeTicit: u.uu cts (u.u iviu/yearj
Developed, no BMPs Ecosurplus: 2.18 cfs (515.0 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 2.17 cfs (511.8
MG/year)
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Flow-Exceedance Percentiles
Figure 19. Flow duration curve with HIGH control of 30% of the Upper Hodges Brook subwatershed's impervious
cover under historic LULC and climate conditions (Scenario 7).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, no BMPs Ecosurplus: 2.18 cfs (515.0 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 2.15 cfs (508.1 MG/year)
Flow-Exceedance Percentiles
Figure 20. Flow duration curve with HIGH control of 80% of the Upper Hodges Brook subwatershed's impervious
cover under historic LULC and climate conditions (Scenario 7).
11
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
100
Developed, no BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, no BMPs Ecosurplus: 2.18 cfs (515.0 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 2.14 cfs (505.9 MG/year)
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Flow-Exceedance Percentiles
Figure 21. Flow duration curve with HIGH control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under historic LULC and climate conditions (Scenario 7).
Developed, no BMPs Developed, with BMPs Pre-Development
100
Developed, no BMPs Ecodeficit: 0.22 cfs (52.3 MG/year)
Developed, no BMPs Ecosurplus: 1.38 cfs (326.5 MG/year)
Developed, with BMPs Ecodeficit: 0.10 cfs (24.1 MG/year)
Developed, with BMPs Ecosurplus: 1.24 cfs (293.6 MG/year)
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Flow-Exceedance Percentiles
Figure 22. Flow duration curve with HIGH control of 30% of the Upper Hodges Brook subwatershed's impervious
cover under historic LULC and future climate conditions {Scenario 8).
12
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs
0.1
Pre-Development
Developed, no BMPs Ecodeficit: 0.22 cfs (52.3 MG/year)
Developed, no BMPs Ecosurplus: 1.38 cfs (326.5 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.3 MG/year)
Developed, with BMPs Ecosurplus: 1.11 cfs (262.3 MG/year)
Flow-Exceedance Percentiles
Figure 23. Flow duration curve with HIGH control of 80% of the Upper Hodges Brook subwatershed's impervious
cover under historic LULC and future climate conditions (Scenario 8).
o.i
Developed, no BMPs Developed, with BMPs Pre-Development
Developed, no BMPs Ecodeficit: 0.22 cfs (52.3 MG/year)
Developed, no BMPs Ecosurplus: 1.38 cfs (326.5 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.2 MG/year)
Developed, with BMPs Ecosurplus: 1.10 cfs (259.4 MG/year)
Flow-Exceedance Percentiles
Figure 24. Flow duration curve with HIGH control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under historic LULC and future climate conditions {Scenario 8).
13
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
100
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.1 MG/year)
Developed, with BMPs Ecosurplus: 1.91 cfs (450.2 MG/year)
10
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Flow-Exceedance Percentiles
Figure 25. Flow duration curve with HIGH control of 30% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and historic climate conditions (Scenario 9).
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100
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Figure 26. Flow duration curve with HIGH control of 80% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and historic climate conditions (Scenario 9).
14
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
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Figure 27. Flow duration curve with HIGH control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and historic climate conditions (Scenario 9).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 1.88 cfs (442.9 MG/year)
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.15 cfs (36.0 MG/year)
Developed, with BMPs Ecosurplus: 1.88 cfs (443.0 MG/year)
Flow-Exceedance Percentiles
Figure 28. Flow duration curve with HIGH control of 30% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and future climate conditions (Scenario 10).
15
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FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
0.01
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Flow-Exceedance Percentiles
Figure 29. Flow duration curve with HIGH control of 80% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and future climate conditions (Scenario 10).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.01 cfs (1.3 MG/year)
Developed, with BMPs Ecosurplus: 1.70 cfs (402.1 MG/year)
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.2 MG/year)
Developed, with BMPs Ecosurplus: 1.69 cfs (397.9 MG/year)
Flow-Exceedance Percentiles
Figure 30. Flow duration curve with HIGH control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and future climate conditions (Scenario 10).
16
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
0.01
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Flow-Exceedance Percentiles
Figure 31. Flow duration curve with HIGH control of 30% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and historic climate conditions (Scenario 11).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.1 MG/year)
Developed, with BMPs Ecosurplus: 1.90 cfs (448.2 MG/year)
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 1.88 cfs (442.6 MG/year)
Flow-Exceedance Percentiles
Figure 32. Flow duration curve with HIGH control of 80% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and historic climate conditions (Scenario 11).
17
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
100
10
Developed, no BMPs Ecodeficit: 0.09 cfs (22.4 MG/year)
Developed, no BMPs Ecosurplus: 2.01 cfs (475.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.0 MG/year)
Developed, with BMPs Ecosurplus: 1.87 cfs (441.3 MG/year)
0.1
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Flow-Exceedance Percentiles
Figure 33. Flow duration curve with HIGH control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and historic climate conditions (Scenario 11).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.11 cfs (26.1 MG/year)
Developed, with BMPs Ecosurplus: 1.83 cfs (432.3 MG/year)
Flow-Exceedance Percentiles
Figure 34. Flow duration curve with HIGH control of 30% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and future climate conditions (Scenario 12).
18
-------
FDC 2A Project
Appendix D
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.2 MG/year)
Developed, with BMPs Ecosurplus: 1.68 cfs (397.0 MG/year)
Flow-Exceedance Percentiles
Figure 35. Flow duration curve with HIGH control of 80% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and future climate conditions (Scenario 12).
Developed, no BMPs Developed, with BMPs Pre-Development
0.1
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Flow-Exceedance Percentiles
Figure 36. Flow duration curve with HIGH control of 100% of the Upper Hodges Brook subwatershed's impervious
cover under future LULC and future climate conditions (Scenario 12).
Developed, no BMPs Ecodeficit: 0.29 cfs (68.0 MG/year)
Developed, no BMPs Ecosurplus: 2.03 cfs (479.1 MG/year)
Developed, with BMPs Ecodeficit: 0.00 cfs (0.2 MG/year)
Developed, with BMPs Ecosurplus: 1.67 cfs (393.4 MG/year)
19
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