Underground Treatment Pipe GIS Data SOP Update

[talllguy]

Based on the whiteboarding session on 7/23/2019, we have a few updates to make to the underground data, and these changes should be spelled out in an SOP.

Draft SOP

The underground facility consists of some subterranean asset, e.g. a vault, pipe, or tank, coupled with above-ground structures and pipes that tie it together with the stormwater management system. The GIS data model should consist of four elements: the SWMFAC boundary, upstream and control structure, conveyances, and "treatment pipes".

SWMFAC Boundary

The SWMFAC Boundary polygon for underground facilities is the same data as regular SWMFACs use. It should encompass the approximate extent of all underground infrastructure, to include upstream structures, construct structures, and assets (tanks, vaults, treatment pipes).

Upstream and Control Structures

The most upstream and downstream (control) structures of the facility should mapped as nodes.

Conveyances

Traditional pipes that connect inlets and such to the underground facility are mapped just like any other pipe. If there is a pipe between an upstream structure and the underground asset, it should be added with a pipe connection where the underground facility begins. Hydraulic connectors should connect the pipe connections through the underground facility.

Treatment Pipes

The treatment pipe feature can remain in the dataset for cartographic representation of underground assets. (I think it should probably be renamed "Underground Facility Asset" -ERP.) These features will not be tied hydralicly to the rest of the NPDES features. They will maintain their optional relationship class to the SWMFAC.

[KCI-Ablowers]

@talllguy Based on Chapter 2 of the SOP, I am not sure whether we should be using a pipe direction or a pipe connection.

• The pipe connection should be used when materials change or two pipes merge together.
• The pipe direction should be used when a pipe is identified at an SHA-owned structure feature that connects to or from a private storm drain system outside of SHA ROW and the private upstream or downstream structure cannot be located.