Stream Size/Site Condition Method
Procedure:
1) Measure bottom channel width (W) and channel depth (D) from bottom to top of bank.
2) Determine whether slope upstream is flat, moderately or extremely hilly and refer to appropriate Table (A-C) on the following pages.
For areas with no perceptible change in elevation upstream of the culvert area, choose (FLAT) slope.
In moderately hilly areas, such as a rise of two (2) feet for every 100 feet of run, choose Moderate (MOD) slope.
In extremely hilly areas, with an approximate rise of ten (10) feet or more for every 100 feet of run, choose critical (CRIT) slope.
3) Read corresponding culvert size based on width and depth of stream channel.
Assumptions: |
