2023-04-19_PERMIT FILE - C1981010 ‎(108)‎

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 4/19/2023
• Doc Name: West Buzzard Hydrologic Model
• Section_Exhibit Name: APPENDIX Q SECTION I
• Media Type: D
• Archive: No

West Buzzard worst Case SEDCAD inputs
(1.1.1)
Topsoiied and One Year Two+Years
Undisturbed Active Seeded Growth Growth Total
Area(acres] 166.8 155.0 0.0 0.0 188.3 510.1
Curve Number 49 87 86 80 67 67 area weighted average
Runoff(01.4") 0.000 0.478 0.434 0.240 0.036 0.159 using TR-55 Table of runoff for selected CN's and rainfall amounts
runoff wtd CCN 76 runoff weighted average
K Factor 0.25 0.14 0.25 0.25 0.25 0.22
C Factor 0.011 1.00 0.45 0.26 0.18 0.37
P Factor 1.00 1.00 0.60 0.60 0.60 0.85
CP Factor 0.01 1.00 0.27 0.16 0.11 0.32
[1.2,2)
Topsoiled and One Year Two+Years
Undisturbed Active Seeded Growth Growth Total
Area(acres) 42.5 0.6 0.0 0.0 2.2 45.3
Curve Number 49 87 86 80 67 50 area weighted average
Runoff(ga1.4") O.ODD 0.478 0.434 0 240 0.036 0.008 usmgTR-55 Table of runoff for selected CN's and rainfall amounts
runoff wtd CCN 60 runoff weighted average
K Factor 0.2.5 0.14 0.25 0.25 0.25 0.25
C Factor 0.011 1.D0 0.45 0.26 0.18 0.03
P Factor 1.00 1.00 0.60 0.60 0.60 0.98
CP Factor 0.01 1.00 027 0.16 011 0.03
West Buzzard Total
Area(acres) 209.3 155.6 0.0 0.0 190.5 555.4
Curve Number 49 87 86 80 67 66 area weighted average
Runoff(01.4") 0.000 0.478 0.434 0.240 0.036 0.146 using TR-SS Table of runoff for selected CN's and rainfall amounts
runoff wtd CCN 76 runoff weighted average
K Factor 0.25 0.14 0.25 0.25 0.25 0.22
C Factor 0.011 2.00 0.45 0.26 0.18 0.35
P Factor 1.00 1.00 0.60 0.60 0.60 0.86
CP Factor 0.01 1.00 0.27 0.16 0.11 0.30
5/17/2022L:\Engineer\mattern 2022\West Panel Drainage and Sediment Controll est Buzzard\West Buzzard Drainage 2022 SEDCAD backup calculations.xisxwest Ruzzard Drainage 2022 SEDCAD backup calrulat ons.xlsx