For component roads, Drainage Design responds to contextual placement, slope and materials. Analysis of inlet location, tributary area, gutter spread and inlet performance utilizes both the component materials and the cross-slopes to adjust an inlet's placement and slope for the best solution in storm conditions. Analysis adjusts runoff coefficients to reflect the choice of materials used in a component road.
Drainage Design analysis enables you to change the AEP (Annual Exceedance Probability) setting (default = 1/10) prior to inspecting the performance of a selected pipe run. Thus, you can check its performance under different storm-level conditions.
With Inlet Analysis turned on (from an inlet's asset card), Drainage Design re-calculates, in real time, runoff data for the tributary area associated with a pair of selected inlets. You can see the data change as you adjust the location of an inlet.
The following rule-based intervals and offsets are used when adding pavement drainage features:
| Inlets |
Inlets are placed only if the selected road uses a road style with a Curb track. Inlets are placed at low points along the road curb, spaced from high points based on the maximum inlet spacing defined in the Pavement Drainage design standard. |
| Manholes |
Manholes are placed at inlet locations at offsets based on the horizontal and longitudinal placement offsets defined in the Pavement Drainage design standard. Horizontal placement offsets to the left are negative. Horizontal placements offsets to the right are positive. |
| Pipes |
Drainage pipes are placed to connect inlets and manholes. Pipes are placed to meet the minimum defined slopes in the Pavement Drainage design standard. If the horizontal placement of a manhole is:
|