2023 09 19 City Council Packet

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• S
tructure size 
• Structure material 
• Pipe shape 
• Pipe size 
• Pipe invert elevation  
• Pipe material  
• Pipe end type (projecting from fill, flared end section etc.) 
• Headwall type  
 
For this task order, data will be collected from  the public stormwater drainage 
system; that is, systems that convey stormwater runoff from public streets or public 
property, including systems on public or private property that convey runoff 
originating from public streets or crossing private property. Only the outfalls of 
private systems will be inventoried unless the private system drains across a private 
property and conveys public water in which case the entire system will be 
inventoried.  “Public water” is defined as water draining from a public street right -
of-way or originating from City -owned property.  The size of the systems to be 
inventoried will be all pipes greater than or equal to 24” in diameter.  
2.4 - Open System  
For Open Systems, typical data collection will include infrastructure information at 
stream crossings, stream channel dimensions and dam information. Engineer will 
collect survey for structures/infrastructure at stream crossings if: 
• Engineer cannot establish parity between the FEMA model data and Owner 
inventory data;   
• Structures not included in the FEMA model but impact Primary System 
hydraulics (private drives/roads, new roads, etc.); and 
• Structure is missing critical data within the City’s inventory (invert, size, 
etc.).  
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