PERMFILE127991

• Permit No: C1980005
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: SMALL AREA EXEMPTIONS
• Section_Exhibit Name: TAB 07 APPENDIX 7-6 ATTACHMENT 7-6-7
• Media Type: D
• Archive: No

Civil Software Design -- SEDCAD+ Version 3.1
Copyright (C) 1987-1992. Pamela J. Schwab. All rights reserved.
Company Name: Peabody Coal Company
Filename: C:\SEDCAD3\SEN2\NEWBNWF User: TJW
Date: 11-30-1992 Time: 10:55:39
NEW BONE YARD NWF (l0yr-24hr Event)
Storm: 1.60 inches, l0 year-24 hour, SCS Type II
Hydrograph Convolution Interval: 0.1 hr
NON-POND STRUCTURE INPUT/OUTPUT TABLE
J2, B1, S1
SILT FENCE 1
Drainage Area from J2, B1, S1, SWS(s)1:
Total Contributing Drainage Area:
POROUS ROCK CHECK DAM INPUTS:
Manning's
Height Slope Z n
(ft) (%)
------------------------------
------------------------------
3.0 1.00%999.0:1 0.050
20.00

Trap Efficiency: 69.83 %
Runoff Peak Peak Sediment Peak Settleable
Volume Discharge Sediment Concentration Concentration
(ac-ft) (cfs) (tons) (mg/1) ml/1
IN 0.06 0.76 0.4 7731
OUT 0.06 0.76 0.1 2338
C~
24VW 24AA
(ml/1) (ml/1)
4.79 3.02 0.47
0.58 0.37 0.06

J2, B1, S2
SILT FENCE 2
Drainage Area from J2, B1, S2, SWS(s)1: 0.0 acres
Total Contributing Drainage Area: 0.8 acres
POROUS ROCK CHECK DAM INPUTS:
Manning's
Height Slope Z n Porosity
-----------------------------------------
-----------------------------------------
3.0 0.10%999.0:1 0.090 10.00
Trap Efficiency: 86.68 %
Runoff Peak Peak Sediment Peak Settleable
Volume Discharge Sediment Concentration Concentration 24VW 24AA
(ac-f t) (cfs) (tons) {mg/1) ml/1 (ml/1) (ml/1)
IN 0.06 0.77 0.1 2468 0.63 0.38 0.06
7-6-7-19
0.0 acres
0.8 acres
Porosity
(%)