The purpose of this entry is to define and describe the cross-sectional geometry of conduits that are used to represent streets in a certain engineering or urban planning context.
Format: The required format to define these parameters follows a certain order: Name Tcrown Hcurb Sx nRoad (a W)(Sides Tback Sback nBack)
Parameters: Each parameter represents a specific aspect of the street's cross-sectional geometry.
Name: This is the unique identifier or name assigned to the street cross-section.
Tcrown: This represents the distance from the street’s curb to its highest point or crown. The measurements are in feet or meters.
Hcurb: This parameter indicates the height of the curb, measured in feet or meters.
Sx: This is the cross slope of the street, expressed as a percentage.
nRoad: This is the Manning’s roughness coefficient (n) of the road surface. It is a measure of how rough the surface is and affects how water flows over it.
a: This parameter represents the gutter depression height, measured in inches or millimeters. It defaults to 0 if not specified.
W: This is the width of the depressed gutter, measured in feet or meters. It defaults to 0 if not specified.
Sides: This indicates whether the street is single-sided or two-sided. It defaults to 2 if not specified.
Tback: This is the street backing width, measured in feet or meters. It defaults to 0 if not specified.
Sback: This is the slope of the street backing, expressed as a percentage. It defaults to 0 if not specified.
nBack: This is the Manning’s roughness coefficient (n) for the street backing. It defaults to 0 if not specified.
If the street does not have a depressed gutter (meaning a = 0), then the gutter width parameter (W) is ignored. Similarly, if the street does not have backing, the three backing parameters (Tback, Sback, nBack) can be omitted. This allows for flexibility and customization based on the specific characteristics of each street.
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