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This geospatial layer is a point feature class that contains information about the location and attributes of system valves of the City of Houston\u2019s wastewater collection system. The control valve layer includes Ball, Butterfly, Cone, Gate, Plug Valve, Valve, and Valve in Manhole.<\/SPAN><\/SPAN><\/P>

The GIS Services Group of Houston Water, Houston Public Works stores and maintains the dataset within a Spatial Database Engine (ArcSDE), Relational Database Management System (RDBMS). <\/SPAN><\/P>

The data are derived from Plan and Profile Engineering drawings obtained from Block Map, As Built, Field Book, Taps and Meters, Metro, Autocad Data from GHW Project, Wastewater Reconciliation Project, Other Source (Operator Input), FVFL, FVFD, Field Verified with Control Number, and Construction Layer.<\/SPAN><\/SPAN><\/P>

<\/DIV><\/DIV><\/DIV>

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