2015-08-31_PERMIT FILE - C1981010 ‎(59)‎

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 8/31/2015
• Doc Name: Reconstructed Drainage Channel Design Model
• Section_Exhibit Name: Appendix Q Section XXXVII
• Media Type: D
• Archive: No

TABLE OF CONTENTS
Summary Executive Summary ..........................................................................................1
Certification Engineering Certification...................................................................................2
NarrativeText Discussion................................................................................................ 3
Table 1 Summary of permissible flow rates in grass -lined drainages based on
SEDCAD modeling for trapezoidal channels of various widths and
slopes............................................................................................................... 4
Table 2 Results of String of Pearls Model showing acres per check dam at
various curve numbers and channel slopes ...................................................... 7
Table 3 Summary of Appendix H SEDCAD sedimentology modeling results.................9
Figure 1
Permissible flow rates in grass -lined channels based on SEDCAD
Appendix B
SEDCAD model of 640 acre watershed using a Curve Number of 67...........
modeling for trapezoidal channels of various widths and slopes .....................12
Appendix C
Figure 2
Typical Configuration and Capacity of a Check dam in 20 Foot wide
Appendix D
String of Pearls SEDCAD model with 10 Check Dams and 10 Erosive
Trapezoidal channel at 5% slope....................................................................13
Figure 3
Typical Configuration and Capacity of a Check dam in 20 Foot wide
Appendix E
String of Pearls SEDCAD model with 10 Check Dams and 10 Erosive
Trapezoidal channel at 10% slope..................................................................14
Figure 4
Typical Configuration and Capacity of a Check dam in 20 Foot wide
Appendix F
String of Pearls SEDCAD model with 10 Check Dams and 10 Erosive
Trapezoidal channel at 15% slope..................................................................15
Figure 5
Typical Configuration and Capacity of a Check dam in 20 Foot wide
Appendix G
Summary of one page SEDCAD models in support of Figure 1 ..................
Trapezoidal channel at 20% slope..................................................................16
Appendix H
Figure 6a
Minimum Number of Check Dams using CN=67.............................................17
Figure 6b
Minimum Number of Check Dams using CN=72.............................................18
Figure 6c
Minimum Number of Check Dams using CN=78.............................................19
Figure 6d
Minimum Number of Check Dams using CN=78.............................................20
Figure 7a
Required Storage Capacity, Channel Slope of 5% ..........................................21
Figure 7b
Required Storage Capacity, Channel Slope of 10% ........................................22
Figure 7c
Required Storage Capacity, Channel Slope of 15% ........................................23
Figure 7d
Required Storage Capacity, Channel Slope of 20% ........................................24
Figure 7e
Required Storage Capacity, Channel Slope of 25% ........................................25
Figure 8
Typical Configuration of and Capacity of a Dozer Basin in a 20 Foot
wide Trapezoidal channel at 5% slope............................................................26
Figure 9
Runoff Volume for a 10 Year, 24 Hour Storm ..................................................
27
Figure 10
Annual Sediment Yield from a 10 Year, 24 Hour Storm..................................28
Appendix A
SEDCAD model of 640 acre watershed using a Curve Number of 72........... A-1
Appendix B
SEDCAD model of 640 acre watershed using a Curve Number of 67...........
A-7
Appendix C
SEDCAD model of 640 acre watershed using a Curve Number of 62.........
A-13
Appendix D
String of Pearls SEDCAD model with 10 Check Dams and 10 Erosive
Channels at CN of 78 and 10%...................................................................
A-19
Appendix E
String of Pearls SEDCAD model with 10 Check Dams and 10 Erosive
Channels at CN of 72 and 10%...................................................................
A-44
Appendix F
String of Pearls SEDCAD model with 10 Check Dams and 10 Erosive
Channels at CN of 78 and 15%...................................................................
A-69
Appendix G
Summary of one page SEDCAD models in support of Figure 1 ..................
A-94
Appendix H
SEDCAD models for sedimentation for a variety of curve numbers...........
A-130
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