Use the Outflow tab to review read-only information around the pipes and structures leading out of the underground storage.

Connected With

Name. Displays the name of the connected pipe.

Description. Displays the description of the connected pipe.

Size. Specifies the inner diameter for the connected pipe.

Invert Elevation. Specifies the elevation at the bottom of the inside surface of the connected pipe.

Centerline Elevation. Specifies the centerline elevation of the connected pipe.

Crown Elevation. Specifies the crown elevation of the connected pipe.

Slope. Specifies the slope of the pipe coming out of the connected pipe.

To Structure. Displays the name of the pipe or structure at the other end of the pipe.

Outlets tab

Use the and buttons to add and remove outflow objects to your drainage system.

Name. Displays the name of the outlet.

Outgoing Connection. Displays the name of the pipe or structure connected to the outlet.

Outlet Type. Specifies the name of the outlet type. Either Free discharge, Weir, or Orifice. Weir and Orifice have the following parameters edited by clicking Parameter Settings . In the Parameter Settings dialog box, specify:

• Diameter. Specifies the inner diameter of the outlet.
• Coefficient of Discharge. Specifies the ratio of the outlet discharge to the ideal discharge for the drainage system.
• Invert Elevation. Specifies the elevation at the bottom of the inside surface of the outlet.

Infiltration tab

Infiltration is the process by which surface water enters the soil. This crucial role of replenishing groundwater is part of the hydrological cycle which also reduces runoff and maintains soil moisture.

Infiltration. Enables the infiltration process.

Base Infiltration Rate. Defines the rate of infiltration through the base of the filter area. This should be determined by a performance site test.

Side Infiltration Rate. Defines the rate of infiltration through the sides of the filter area. This should be determined by a performance site test.

Safety Factor. Specifies a reduction in infiltration rate to account for silting or poor maintenance.