Chapter XXXI — SUBDIVISION <sup> </sup>›Article III — IMPROVEMENTS
31-27 OPEN CHANNELS AND CONDUITS.
Danville Municipal Code · 2026-09 edition · updated 2026-10-02 · Danville
31-27.1 Earth Channels; Maximum Design Velocities.¶
Maximum design velocities for natural or artificial earth channels shall be those specified by a soil engineer in the preliminary soil report.
31-27.2 Earth Channels; Minimum Velocities.¶
Minimum velocities at design capacity for earth channels shall be three (3') feet per second.
31-27.3 Earth Channels; Side Slopes.¶
Side slopes for improved earth channels shall be those specified by a soil engineer, but in no instance shall side slopes be steeper than one and one-half horizontal to one vertical (1 1/2:1).
31-27.4 Lined Channels; Side Slopes.¶
Side slopes for lined channels shall be those specified by a soil engineer.
31-27.5 Closed Conduits; Minimum Flow Line.¶
Minimum flow line gradients for closed conduits shall be not less than three one-thousandths (.003') foot per foot.
31-27.6 Closed Conduits or Lined Channels; Outlet Velocity.¶
Where the outlet velocity from a closed conduit or lined channel exceeds the maximum allowable velocity for the earth channels receiving the flow, suitable protective works such as riprap or a stilling basin shall be provided.
31-27.7 Clearance of Natural Channels.¶
The subdivider shall, within the boundaries of the subdivision, selectively clear all natural channels and watercourses of all structures, trees, brush, and debris which would interfere with or obstruct the flow of storm waters.
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