StormCAD Cover Calculation

Hello Hari,

The cover is measured at the start and the stop node measuring the diameter (rise) of the pipe from the invert level. The manhole / catch-basin node is generally horizontal and the cover is measured from the crown of the pipe (invert level + rise) to the ground level. With the start and stop nodes covers calculated this way you can get an average cover value field in the pipe / conduit properties.

Hope this answers your query.

So this cover calculation will not work in my case because most of my pipes are inclined and stormCAD only calculating based on flat invert?

Thank you,

Hari

Hello Hari,

I adjusted a sample model so that a conduit had a steep slope and the cover calculations were will accurate. The start and stop covered were calculated based on the crown or soffit of the pipe and the ground elevation. Note that you can choose between measuring the cover from the pipe crown or pipe soffit in the Default Design Constraints.

The average cover is the simple average between the start and stop cover. In the Default Design Constraints manager, there is an option to allow terrain to be considered. If you check the box for "Consider cover along pipe length?" and are using an active terrain model, you can ensure that any undulations in the surface between the ends of the pipe are taken into account when the elevations of the pipe are calculated. If this box is unchecked, then the cover is only considered at the start and end of the pipe, using the ground elevations of the start and end nodes. 

Regards,

Scott

Hello Hari,

I adjusted a sample model so that a conduit had a steep slope and the cover calculations were will accurate. The start and stop covered were calculated based on the crown or soffit of the pipe and the ground elevation. Note that you can choose between measuring the cover from the pipe crown or pipe soffit in the Default Design Constraints.

The average cover is the simple average between the start and stop cover. In the Default Design Constraints manager, there is an option to allow terrain to be considered. If you check the box for "Consider cover along pipe length?" and are using an active terrain model, you can ensure that any undulations in the surface between the ends of the pipe are taken into account when the elevations of the pipe are calculated. If this box is unchecked, then the cover is only considered at the start and end of the pipe, using the ground elevations of the start and end nodes. 

Regards,

Scott