A. Arterial, collector and sole access streets to subdivisions may not employ at grade or dip section crossings of arroyos and other natural drainageways. Channel crossings structures shall be provided on all arterial and collector streets to safely pass the 50-year, 24-hour frequency storm.
B. Streets other than arterial, collector and sole access streets to major subdivisions may cross major arroyos and other watercourses by means of a dip section or overflow section, provided that depth times velocity (with velocity calculated as the average velocity measured in feet per second and depth measured in feet at the upstream edge of the roadway including sidewalk, if applicable) does not exceed 6.5 for that portion of the 10-year design storm runoff crossing the street. However, the depth of flow shall not be greater than 0.67 feet for urban or rural streets.
C. Where feasible, temporary crossings shall be designed so they may be incorporated into the future permanent crossing structure and so that they meet street design standards established by the village public works director.
If dip sections are permitted, vertical alignment must satisfy the requirements given for sight distances considering the design speed of the street in question.
D. Special design provisions for protection of the roadway may be required by the village public works director. (Ord. 2007-06, 8-14-2007)