The developer shall adequately protect all ditches to the satisfaction of the Engineer by one of the following methods:
(a) Ditch Protection in the Form of Item 659 - Seeding and sodding, shall be provided. The following shall be the allowable Ditch Velocities for seeding and sodding on various soil types:
Soil Type | Allowable Seeding Velocity FPS | Allowable Sodding Velocity FPS |
a. Fine sand | 2 | 5 |
b. Silt loam | 2 | 5 |
c. Ordinary firm loam | 2.5 | 5 |
d. Stiff clay | 3 | 6 |
e. Graded silt to cobbles | 4 | 6 |
f. Weathering shales | 5 | - |
g. Coarse gravel | 6 | 7 |
When the outlet velocity of culvert pipes, drive pipes, or side drains is in excess of the above allowable velocities, sufficient length of Paved Gutter, shall be provided for transition to allowable velocity.
The drainage section of the Division of Design and Construction, Location and Design Manual (0DOT) shall be used as the basis for design.
Computations, drawings, and drainage area maps used to design the above Ditch Protection shall be submitted to the Engineer along with the plans and profiles as a basis for approval.
In all cases, the Ditches shall be in a stable condition free from either erosion or sedimentation at the time of final approval.
Ditch Easement. On each side of ditch measured from top of slope, 30 ft.
(b) Paved Gutters. This item shall consist of the construction of a brick, concrete, or stone paved gutter and shall be used in all ditches where the grade exceeds 2-1/2 percent. (Ord. 82-16. Passed 4-19-82.)