PERMFILE63734

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 08 TAB 2.11 Ditch D-1 SEDCAD Design
• Media Type: D
• Archive: No

SEDCAD+ ERODIBLE CHANNEL DESIGN

DITCH D-I
Limiting Velocity Technique
Sediment-laden Water
INPUT VALUES:
Shape PARABOLIC:
Dischazge 13.80 cfs
Slope 0.90
Manning's n 0.025
Max. Velocity 5.00 fps
Material ALLUVIAL SILTS COLLOIDAL
Freeboazd .3 ft
RESULTS:
!;J
Actual Dischazge 13.80 cfs
Depth 1.11 ft
with Freeboazd 1.41 ft
Top Width 4.45 ft
with Freeboard 5.01 ft
Velocity 4.18 ft
Cross Sectional Area 3.30 sq ft
Hydraulic Radius 0.64 ft
Froude Number 0.86
I, MICHAEL W. LUDLOW, A REGISTERED PROFESSIONAL ENGINEER IN THE
STATE OF COLORADO, DO HEREBY CERTIFY THAT THE CULVERT DESIGN
CALCULATIONS FOR TWENTMILE COAL COMPANY, DITCH D-l (EXHIBIT 8,
PAGE 118) AND CULVERT D-1-C (EXMB[T 8, PAGE ll9), ARE TRUE AND
CORRECT TO THE ~.9R~~ uJ~Y KNOWLEDGE AND BELIEF BASED UPON MY
INQUIRY OF TH~`~'~~15~"QrISIBLE FOR COMPLETING THE DESIGN.
24046

MICHAEL W.'
P.E. N0.24046
TAB 2.11. PG. 5
~~u
DATE
Permit Renewal No. 3
EX. 8- 118 I I / l /99
F(1R11AC^I v ~.. . ,.