PERMFILE123068

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 08 TAB 4.9 East Rockfall Hazard Trench, 10yr 24hr SAE
• Media Type: D
• Archive: No

Civil Software Design -- SEDCAD+ Version 3.1
Copyright (C) 1987-1992. Pamela J. Schwab. All rights reserved.
Company Name: CYPRUS YAMPA VALLEY COAL
Filename: E:\SEDCAD3\TCCSS\ETRENCH4 User: CW BEGEJ
Date: 06-01-1995 Time: 13:54:27
SAE DEMONSTRATION, EAST ROCKFALL HAZARD TRENCH, 10-YR 24-HR STORM
Storm: 1.80 inches, 10 year-24 hour, SCS Type II
Hydrograph Convolution Interval: 0.1 hr
NON-POND STRUCTURE INPUT/OUTPUT TABLE
---------------------------=-------------
J1, B1, S1
X-SECT Q-P
Drainage Area from J1, B1, S1, SWS(s)1-3: 4.8 acres
Total Contributing Drainage Area: 4.8 acres
POROUS ROCK CHECK DAM INPUTS:
Heigght
(ft)
3.5
Slope Z
_(~) _
2.50 1.5:1
Trap Efficiency:
Porosity
(~3
41.00
42.63 ?;
Runoff Peak Peak Sediment Peak Settleable
Volume Discharge Sediment Concentration Concentration 24VW 24AA
(ac-ft) (cfs) (tons) (mg/1) ml/1 (ml/1) (ml/1)
------------------------------------------------------------------------------
------------------------------------------------------------------------------
IN 0.06 0.42 0.2 8129 5.51 2.21 0.44
OUT 0.06 0.42 0.1 4670 2.63 1.06 0.21
J2, B1, S2
X-SECT N-O: MID 1/4
Drainage Area from J2, B1, S2, SWS(s)1-3: 0.5 acres
Total Contributing Drainage Area: 9.5 acres
POROUS ROCK CHECK DAM INPUTS:
Manning's
Hr(fg;t S`o~pe Z n Por(~S;ty
----tt--------))-----------------------------
-----------------------------------------
3.5 25.50 1.5:1 0.032 41.00
Trap Efficiency: 19.09 $
Runoff Peak Peak Sediment Peak Settleable
Volume Discharge Sediment Concentration Concentration 24VW 24AA
(ac-ft) (cfs) (tons) (mg/1) ml/1 (ml/1) (ml/1)
IN -_-==0.14_--==1.25======0.5-------==7009=====----==4.56==----==2.19==-0.35
OUT 0.14 1.25 0.4 5674 3.45 1.65 0.26
*******,rrt****~*******~~*,r*~****~***~***************~*~******************,t***
J2, B1, S4
X-SECT N-O: LOW 1/4
. Drainage Area from J2, B1, 54, SWS(s)1-3: 1.0 acres
Total Contributing Drainage Area: 11.6 acres
POROUS ROCK CHECK DAM INPUTS:
Manning's
Height Slope Z n Porosity
Permit Renewal No. 3 t t~t~99
cno~~c o~ v .... . on TAB 4.9. P(i 9
Manning's
n
0.032