2017-01-19_PERMIT FILE - C1981008A

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 1/19/2017
• Doc Name: Collection/Diversion Ditches and Culverts Design Parameters
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-1
• Media Type: D
• Archive: Yes

*The numerator and denominator in average ditch slope for C 11 designate two distinct ditch lengths, the mild portion and the steep portion. The steep portion for these
ditches will be lined with cobbles/shingles. Cobbles and Shingles have a manning's n of 0.035 which reduces the velocity to acceptable levels. In installation, the
cobbles/shingles may be substituted by durable rock of D50 of 8" size. These special ditch sections are shown on Map 2.05.3(3)-1.
Ditch C20 will have lining of D50 of 8" size for 20' length on either side of Culvert 112. The remainder of this ditch will have no lining.
Attachment 2.05.3(3)-1 Page 9 March 2016 (TR -70)
Structure Watershed Watershed
Watershed
Runoff
Design
Time of
Peak
Avg.
Ditch
Ditch Velocity at Comments
Basin(s) Area
% Avg.
Curve
Storm
Conc.
Flow
Ditch
Bottom
Depth (ft) Design Flow
(acres)
Slope
No.
(yrs)
(hrs)
(cfs)
Slope %
Width (ft)
(ft/sec)
D109
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A N/A
Removed
*The numerator and denominator in average ditch slope for C 11 designate two distinct ditch lengths, the mild portion and the steep portion. The steep portion for these
ditches will be lined with cobbles/shingles. Cobbles and Shingles have a manning's n of 0.035 which reduces the velocity to acceptable levels. In installation, the
cobbles/shingles may be substituted by durable rock of D50 of 8" size. These special ditch sections are shown on Map 2.05.3(3)-1.
Ditch C20 will have lining of D50 of 8" size for 20' length on either side of Culvert 112. The remainder of this ditch will have no lining.
Attachment 2.05.3(3)-1 Page 9 March 2016 (TR -70)