DaylightProfileControlled

This subassembly closes the sections from the outside edge of the roadway (subgrade shoulder point) to cut or fill slope intersect point.

Subassembly provides a variety of solutions for ditch and fill conditions as described below. Parameters to complete a ditch or fill section include insuring that a safe recoverable distance and slope are provided, in addition to providing parameters for both a v-ditch or a flat bottom ditch.

All link slopes can target a profile. The elevations from the targeted profile(s) are then interpreted as slope values, allowing for smooth slope transitions.

The user has the ability to force cut behavior (ditch) in a fill section and fill behavior in a cut section. If a ditch is created above the target surface, a berm is created.

In situations where more than one target surface intercept is possible, the user has several controls available to choose the desired intercept.

Options to override the final daylight location are available.

This subassembly is designed to accommodate a wide variety of recovery section, ditch section and fill section configurations. It has the option of allowing you to target a profile elevation for the ditch point and varies in its behavior depending on whether a ditch elevation is assigned. A berm may also be constructed depending on the scenario or if a berm profile is targeted.

Clear zone distance vs Reduced recoverable slope distance #clear

There are two Input parameters that control the effect of clear zone on the subassembly. The Clear zone distance parameter is used in all fill and ditch scenarios to establish a recoverable slope rate for a specified distance.

However, the Reduced recoverable distance may be specified to reduce the width of the recoverable slope to something less than the Clear zone distance. In that case, a clear runout area can be provided at the toe of the slope. See FDM 11-15 Attachment 1.9 for more information. The clear runout location is determined by adding the difference between the Clear zone distance and the Reduced recoverable distance (minimum of 10 ft) to the location where a slope begins that is equal to or flatter than the Tranversable ditch backslope value. This location is typically either the beginning or end of the ditch foreslope link.

Determining Ditch or Fill condition

The Ditch/fill switch parameter determines whether the subassembly creates a ditch or fill section. If the Ditch/fill switch parameter is set to "Fill", it will create a fill slope regardless of the terrain condition. If the Ditch/fill switch parameter is set to "Ditch", it will create a ditch (and possibly berm) regardless of the terrain condition. By default, Ditch/fill switch parameter is set to "Automatic" and determines the ditch/fill condition by comparing the subgrade shoulder point elevation with the target surface elevation at the offset specified by the Ditch/fill check offset input parameter. When the Ditch/fill check offset parameter is set to 0, the surface elevation is taken at the attachment point offset (typically subgrade shoulder point). An optional profile may be targeted to determine the ditch/fill condition. The profile overrides the Ditch/fill switch input parameter selection. The profile elevations are interpreted as logic switches. Elevation < 1 means the subassembly should use ditch logic. An elevation = 1 means the subassembly should remain in automatic mode as described above. An elevation > 1 means the subassembly should use fill logic. These options allow the user to force ditch logic in a fill condition or fill logic in a cut condition.

Fill section

If a fill condition is determined, the logical steps used are as follows. The Clear zone slope distance or Reduced recoverable distance (whichever is smaller) and Recoverable foreslope are used to temporarily construct the first fill link, hereby called the recoverable slope link ending at a test point. This distance, in most cases, is measured from the edge of the topmost pavement layer of the outermost lane (ETW). The offset of this point is the Offset to measure recoverable slope from and can be input by the user, passed from the lane subassembly by using a parameter reference, or located using a horizontal target. If the test point falls above the daylight surface, the first recoverable slope link is inserted. If the test point falls below the daylight surface, the recoverable slope link will end at its intersection with the daylight surface, thereby completing the fill section. This point then becomes the slope intercept point.

The Offset to measure recoverable slope from cannot exceed the attachment point offset of this subassembly. If that occurs, the Offset to measure recoverable slope from value will be set equal to the attachment point offset.

To close to the daylight surface in fill, the Fill slope parameter is used.

The subassembly can be forced into fill logic even when the subgrade shoulder point falls below the target surface. In that case, the above logic applies until a slope intercept is located. If a slope intercept is not located with the given Input parameters, and error is reported and a single link is drawn representing the recoverable slope.

Ditch section

If a ditch condition is determined, the logical steps used are as follows:

The Ditch foreslope and Ditch foreslope width are used to construct the first ditch link from the subgrade shoulder point. Then, a Ditch Link is inserted using Ditch bottom width parameter.

The Reduced recoverable distance is used in scenarios where the recoverable slope distance is reduced to less than the required clear zone distance. See earlier section Clear zone distance vs Reduced recoverable slope distance #clear. In most cases, the Reduced recoverable distance is measured from the edge of the topmost pavement layer of the outermost lane (ETW Offset). The offset of this point can be input by the user, passed from the lane subassembly using a Parameter Reference, or located using a horizontal target.

If the Clear zone distance, or resulting clear runout falls outside the Outer Ditch Point, a temporary link is constructed from the Outer Ditch Point using the Traversable ditch backslope, ending in a test point. If the test point falls above the daylight surface, then the link will end at its intersection with the daylight surface, thereby completing the ditch section. This point then becomes the slope intercept point. If the test point falls below the daylight surface, the link is inserted and the Ditch backslope parameter is used to create the final link to the daylight surface.

If the Clear zone distance, or resulting clear runout defined falls on the berm top, the entire berm top slope will not exceed the Traversable ditch backslope. If the Clear zone distance, or resulting clear runout defined falls on the berm fill slope (daylight slope), the entire berm fill slope will not exceed the Traversable ditch backslope.

A ditch section can be forced in an otherwise fill scenario. If the ditch elevation falls above the target surface, with or without a profile target, the subassembly will first attempt to slope upward from the ditch bottom to intersect the target surface using the Ditch backslope or Traversable ditch backslope.

 

If no intersection is found, a berm will be created using the Ditch backslope, berm top slope, berm height, and berm width Input parameters. The subassembly will check for an intersection with the target surface on the berm top link, and berm fill link. If the surface is encountered on either link, the subassembly will daylight at that location.

 

The top of berm elevation is located by measuring upward from the ditch elevation by the distance of the berm height parameter. There is an option to target a profile for the top of berm elevation. When a profile is targeted and is valid, the berm elevation is set by either the berm profile or the berm height parameter, whichever is higher. Therefore, the berm height parameter can be set to zero if the user would like full berm height control utilizing a profile.

Ditch target logic

Establish the elevation of the ditch point

From the ditch point elevation established, go up using the Ditch width and Ditch slope specified to a test point called B, (this point's offset is not decided yet). A rotation point is located using the Recoverable foreslope and Clear zone distance or Reduced recoverable distance entered from the subgrade shoulder point down to a point called A. If point A lies above point B, the recoverable slope link and the ditch foreslope link are connected by a link referred to as the connecting link, using the slope entered by user in the Connecting link slope input. Now the B's offset and ditch bottom inside point offset is determined.

To form a flat-bottom ditch, a ditch link is inserted from the ditch bottom inside point to ditch bottom outside point using Ditch bottom width or Ditch bottom width from profile target.

If the Clear zone distance, or resulting clear runout distance falls on the ditch backslope, a second traversable ditch backslope link is created from the ditch point. If daylight surface is encountered by the traversable ditch backslope link, the link will terminate at the daylight surface.

To close to the daylight surface, the intercept to the daylight surface is calculated using Ditch backslope value.

The subassembly can be forced into ditch section logic in an otherwise fill scenario.

If a ditch profile is targeted but the profile is higher than the target surface, a berm will automatically be created to form the ditch. The berm height can be controlled by a Berm elevation target object. However, the Berm elevation target must be higher than the Ditch elevation target plus the Berm height parameter. Otherwise, the Berm height parameter will be used to control the berm height. The berm elevation established by the Berm height parameter or a targeted profile is at the inside berm point. The outside berm point elevation is determined by the Berm top slope parameter..

 

Multi-Intercept Control

In situations where there could be multiple target surface intercepts, additional controls are provided to select the desired slope intercept. The Number of target surface intercepts parameter can be used to choose which surface intercept is desired. By default, this parameter is set to 1 and the first surface intercept from the starting location is used. The starting location is the location where the surface intercepts are counted from. In a fill situation, the starting location is the same as the attachment point. In a ditch situation, the starting location is the ditch point (outside ditch point for flat bottom ditches). In a berm situation, the starting location is the inside top of berm. This subassembly supports up to eleven surface intercepts.

For additional control, the Minimum offset to intercept parameter has been provided. This parameter can be used to force the subassembly to use a surface intercept that is a minimum offset from the baseline. When the Set min offset >/= to clear zone or recoverable slope offset parameter is set to "Yes", the minimum offset to the slope intercept is set equal to the clear zone or recoverable slope offset, except in cases where the only possible intercept is found within the clear zone or recoverable slope. In that case, the only possible intercept is used.

Both the Number of target surface intercepts parameter and the Minimum offset to intercept parameters can be controlled using profile targets. The Number of intercepts from profile elevation target can be used to control the desired intercept number with a profile. The profile elevation values are rounded to the nearest integer and interpreted as the desired surface intercept number. The Minimum offset from profile elevation target can be used to establish the minimum offset from the baseline to the surface intercept. The Minimum offset to intercept parameter can also be controlled by using the Minimum offset horizontal target.

The hierarchy for multi-intercept control is as follows. The surface intercept is determined by the parameter that results in the maximum offset from the baseline.

Example:

Number of intercepts from profile = intercept number 3, which is 35 ft from the baseline

Minimum offset from profile = 40 ft, which results in a surface intercept at 42 ft from the baseline

Minimum offset = target is places 30 ft from the baseline

The resulting surface intercept is controlled by the Minimum offset from profile target because it results in the furthest surface intercept at 42 ft.

Daylight location override

There are two targets available to override the final daylight intercept location. If the Daylight offset location override target is established, the daylight link of the subassembly will terminate at the target object horizontal location on the target surface. If the Daylight offset location override target is established and the Daylight elevation location override is established, the daylight link of the subassembly will terminate at the offset target object’s horizontal location and at the elevation target object’s vertical location. If only the Daylight elevation location override is targeted, the final daylight intercept location will not be overridden.

If the Daylight offset location override target falls inside of the final link origin, a near vertical link will be inserted.

The daylight location override functions are not available when the normal daylight intercept location falls within the recoverable slope, ditch bottom slope, or berm top slope.

Constructability Check

The subassembly will perform a constructability check by comparing the slope lengths with the Minimum slope length input parameter. If adjacent links are the same slope, the length of the entire consistent slope is evaluated. An informational message will appear in the Event Viewer indicating the station and link where the minimum slope length is not achieved. The designer can then decide how to remediate the issue. If the check is not desired, the Minimum slope length parameter can be set to zero. The check is only performed on the following links. Other links are not checked because they are controlled directly by an input parameter, or they are the final daylight link.

L1 Recoverable foreslope

L3 Traversable ditch backslop

L4 Connecting

L5 Ditch foreslope

L7 Ditch backslope (only when a berm is created)

The attachment point is at the start of the first link, which is the recoverable link. The subassembly is typically attached to the outside edge of the roadway, such as the subgrade shoulder point, back of sidewalk or back of curb. This component can be attached to either the left or right side.

In layout mode, this subassembly shows both the ditch backslope and fill slope solutions. The daylight links are extended outward for a horizontal distance of 10 feet.

Info: All dimensions are in feet unless otherwise noted. All slopes are in run-over-rise form (for example, 4:1) unless indicated as a percent slope with a "%" sign.

Parameter	Description	Type	Default
Side	Specifies which side to place the subassembly	String, Combo List of options: Left Right	Right
Ditch/fill switch	Determines when the subassembly follows fill logic only, ditch logic only, or if ditch/fill conditions are to be determined automatically	String, Combo List of options: Automatic Ditch Fill	Automatic
Ditch/fill check offset	Specifies the offset where the target surface elevation is determined. This elevation is then compared to the attachment point elevation. If the attachment point elevation is greater than the surface elevation at the given offset, a fill is constructed. If the attachment point elevation is less than the surface elevation at the given offset, a ditch is constructed. Input is always positive and the side assignment determines the sign (+/-). A value of 0 indicates that the attachment point offset should be used.	Numeric	0.0 ft
Number of target surface intercepts	The target surface intercept number counted from the attachment point that is used as the daylight slope intercept.	Integer	1
Set min offset >= to clear zone or recoverable slope offset?	When set to "Yes", the minimum offset to the slope intercept is set equal to the clear zone offset or recoverable slope offset, whichever is greater.	Yes/No	Yes
Minimum offset to intercept	The minimum offset from the baseline to establish the daylight slope intercept	Numeric	0
Offset to measure recoverable slope from	Offset, measured from the baseline, used to start clear zone or recoverable slope measurement from. This can be obtained from the ETW Offset distance of the adjacent lane with a Parameter Reference, or will use fixed value here. Positive values are right of baseline, negative values are left of baseline.	Numeric	12 ft.
Clear zone distance	Required clear zone distance measured from the offset specified by the Offset to measure recoverable slope from parameter.	Numeric	30.0 ft.
Recoverable foreslope	Slope for recoverable foreslope area	Slope	4:1
Traversable ditch backslope	Slope for clear zone area that falls on the backslope of the ditch. (ditch only)	Slope	4:1
Reduced recoverable distance	Recoverable slope distance when reduced from the full clear zone distance. This distance is measured from the offset specified by the "Offset to measure recoverable slope from" parameter. The difference between the clear zone distance and the recoverable slope distance it then computed and can be provided at the base of the slope. See FDM 11-15 Att 1.9.	Numeric	9999 ft
Connecting link slope	When a profile is used to control the elevation of the ditch bottom point, the slope entered here defines the slope of the link between the end of the recoverable link and the ditch point. (ditch only)	Slope	4:1
Ditch foreslope	Slope of the ditch foreslope link (ditch only)	Slope	6:1
Ditch foreslope width	Width of the ditch foreslope link (ditch only)	Numeric , positive	8.0 ft
Ditch bottom width	Width of the flat-bottom ditch (ditch only)	Numeric, positive	0.0 ft
Berm height	Determines the berm height measured from the ditch bottom to the inside berm point (ditch only)	Numeric, positive	0.0 ft
Berm top width	The top width of the berm when a berm is constructed.	Numberic, positive	8.0 ft
Berm top slope	The slope of the top of berm when a berm is constructed. (ditch only)	Grade	0%
Omit daylight link	Include or omit the final link	Include / Omit	Include
Ditch backslope	Default slope rate of ditch backslope (ditch only)	Slope	4:1
Daylight fill Slope	Default slope rate of last link in fill (Fill or berm)	Slope	4:1
Minimum 3D slope length	Minimum length of any slope. Used to notify designer of constructability issues due to "short" links.	Numeric, Positive	0.0 ft.

This section lists the parameters in this subassembly that can be mapped to a target object such as a surface, alignment, or profile object in a drawing. For more information, see Setting and Editing Targets in the AutoCAD Civil 3D User's Guide Help.

Parameter	Description	Status
Daylight surface	Name of the Surface for Daylighting. The following object types can be used as targets for specifying this surface: surfaces	Required
Ditch/Fill switch	Profile object used to determine if the subassembly should use ditch logic (EL<1), automatic ditch/fill logic (EL=1), or fill logic (EL>1). Profile elevations are interpreted as switches for the three options. Automatic mode compares the subgrade shoulder point elevation to the target surface elevation at the specified offset.	Optional
Ditch/fill check offset	Object that defines the offset to check the target surface elevation for comparison with the subgrade shoulder point elevation. Used in automatic mode for ditch/fill determination.	Optional
Ditch elevation	Object used to determine the bottom of the ditch. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Berm elevation	Object used to determine the top of berm elevation at the inside berm point. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Berm height from profile	Object that defines the height of the berm as measured from the ditch bottom elevation. Object elevation is interpreted as berm height.	Optional
Ditch foreslope width from profile	Object that defines the width of the ditch foreslope link by its elevation value.	Optional
Berm top width from profile	Object that defines the width of the top of berm link by its elevation value.	Optional
Ditch bottom width from profile	Object that defines the width of the ditch bottom for a flat bottom ditch by its elevation value	Optional
Offset to measure recoverable slope from	Object that defines the horizontal location to measure the clear zone or reduced recoverable slope distance from. Generally, this is the edge of traveled way	Optional
Clear zone offset	Object that defines the clear zone location. The following object types can be used as targets for specifying the width: alignments, polylines, feature lines, or survey features.	Optional
Clear zone width from profile	Object that defines the clear zone width by its elevation value. The elevation is interpreted as a width. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures	Optional
Reduced recoverable offset	Object that defines the recoverable slope offset when reduced from the full clear zone offset. The following object types can be used as targets for specifying the width: alignments, polylines, feature lines, or survey features.	Optional
Recoverable foreslope from profile	Object that defines the recoverable slope by its elevation value. The elevation is interpreted as a slope. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Traversable ditch backslope from profile	Object that defines the traversable ditch backslope by its elevation value. The elevation is interpreted as a slope. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Connecting link slope from profile	Object that defines the connecting link slope by its elevation value. The elevation is interpreted as a slope. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Ditch foreslope from profile	Object that defines the ditch slope by its elevation value. The elevation is interpreted as a slope. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Berm top slope from profile	Object that defines the top of berm slope by its elevation value. The elevation is interpreted as a slope. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Ditch backslope from profile	Object that defines the ditch backslope by its elevation value. The elevation is interpreted as a slope. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Daylight fill slope from profile	Object that defines the fill slope by its elevation value. The elevation is interpreted as a slope. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Minimum offset to intercept	Object that defines the minimum offset from the baseline to establish the slope intercept. The following object types can be used as targets for specifying this horizontal location: alignments, polylines, feature lines, or survey figures.	Optional
Number of target surface intercepts from profile	Object that defines the number of daylight surface intercepts to use as the final slope intercept location. The elevation is interpreted as an integer defining the intercept number. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Minimum offset to intercept from profile	Object that defines the minimum offset from the baseline to establish the slope intercept. The elevation is interpreted as an offset distance from the baseline. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Daylight offset location override	Object that defines the horizontal location of the final slope intercept.	Optional
Daylight elevation location override	Object that defines the vertical location of the final slope intercept.	Optional

None

Point/Link/Shape	Codes	Description
P1	Uncoded	Attachment point
P2	Recover_Point	Recovery point
P3	Clear_Zone	Ditch condition only – Clear Zone Point
P4	Break_Point	Ditch condition only - Break between connecting link and ditch foreslope
P5	Ditch_In	Ditch condition only - Inside ditch point
P6	Ditch_Out	Ditch condition only - Outside ditch point
P7	Berm_In	Ditch condition only - Inside berm point
P8	Berm_Out	Ditch condition only - Outside berm point
P9	Daylight	Slope Intercept (Daylight) Point in Ditch and Fill
L1	Top,LABELSLP,RecovFslp,TOPDATUM	Recoverable slope link
L2	Top,LABELSLP,FillSlp,TOPDATUM	Finished Grade Daylight Fill Link
L3	Top,LABELSLP,TravDtchBslp,TOPDATUM	Ditch condition only - Clear zone link
L4	Top,LABELSLP,CnctSlp,TOPDATUM	Ditch condition only - Connecting link
L5	Top,LABELSLP,DtchFslp,TOPDATUM	Ditch condition only - Ditch foreslope link
L6	Top,DtchBot,TOPDATUM	Ditch condition only - Flat bottom ditch link.
L7	Top,LABELSLP,DtchBslp,TOPDATUM	Ditch condition only - Finished Grade Daylight Link
L8	Top,BermTop,TOPDATUM	Ditch condition only – Berm top link