PERMFILE70936

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 9/10/2004
• Section_Exhibit Name: Exhibit 08t 18 Right Ventilation Shaft Ditch & Culvert Design & SAE Demonstration
• Media Type: D
• Archive: No

• Culvert 1
Use same design parameters as Road Drainage Ditch 1
Peak flow = 0.88 cfs
Diameter required = 18-inch CMP minimum, with a minimum of 2 feet
compacted cover, and riprap protection at the inlet and outlet
Road Drainage Ditch 2
Design Parameters:
Precipitation:
Use 10-year, 24-hour storm precipitation depth = 1.8 in
Land Use:
Undisturbed area = 19.05 ac with CN = 63 (Sagebrush -Hyd. Soil Gp. C)
Road surface (gravel) = 0.60 ac with CN = 89
Maximum road grade = 8.0
Ditch length = 1,044 feet
Ditch design =triangular ditch with 3:1 side slopes (see Figure 2)
Ditch surface material is alluvial silts colloidal
Limiting ditch velocity = 3.75 fps
Results:
Peak flow = 0.55 cfs
Peak velocity = 3.75 fps
Culvert 2
Use same design parameters as Road Drainage Ditch 2
• Peak flow = 0.55 cfs
Diameter required = 18-inch CMP minimum, with a minimum of 2 feet
compacted cover, and riprap protection at the inlet and outlet
Road Drainage Ditch 3
Design Parameters:
Precipitation:
Use 10-year, 24-hour storm precipitation depth = 1.8 in
Land Use:
Undisturbed area = 22.16 ac with CN = 63 (Sagebrush -Hyd. Soil Gp. C)
Road surface (gravel) = 0.29 ac with CN = 89
Maximum road grade = 9.5
Ditch length = 514 feet
Ditch design = triangulaz ditch with 3:1 side slopes (see Figure 2)
Ditch surface material is alluvial silts colloidal
Limiting ditch velocity = 3.75 fps
Results:
Peak flow = 0.267cfs
Peak velocity = 3.35 fps
Culvert 3
Use same design parameters as Road Drainage Ditch 3
Peak flow = 0.27 cfs
•