`When a DWG is converted to Allsite any existing Civil 3D parcels get Allsite extended data automatically applied, this includes lot grade information and other data for both Service AI and Level AI to run.
Sometimes tiny parcels are automatically created in road corridors. Use the Toolspace to find and remove these.
Default parcel settings (configured in the web)
When parcels are converted to Allsite they inherit default lot settings from their linked Allsite.ai project (you can see all Level AI settings on the web or via the Settings button in the Civil 3D Allsite ribbon). These settings define the initial values for things such as parcel lot grades and lot typology. See below for more information on different lot types. They also define the behaviour of the lot system to grades, such as protective slopes, driveway and rear yard grades.
Lot grade settings are only applied to lots that have a building on them and have been set to NORMAL lot type with a SINGLE FAMILY lot typology.
Default grades
This table define the lot typology and grades for different lot types. See here for more details on lot typology.
Protective Slopes
This defines the graded surface immediately surrounding a building platform, designed to direct runoff away from the building and out of the lot. Feature lines are automatically added defining the shape of the flow lines / swales. These are only relevant for single family NORMAL lot typology when a building is on the parcel.
Setting | Description |
Flow line slope comfort (%) Flow line min / max grade (%)
| Target and limits for grades of the swale / flow line collecting run-off from the building and taking it out of the site. |
Protective slope min / max grade (%) | Minimum and maximum limits of the protective slope around building. |
Protective slope distance | Distance away from building the protective slope connects with the flow line. |
Protective slope positions | The locations for protective slopes (and flow lines) around the building. Can be:
|
Driveway Grades
This defines the graded surface at the front of Type C lots.
Setting | Description |
Driveway max grade initial (%) | Maximum grade of the first 6.5ft of the parcel |
Driveway transition max grade change (%) | Maximum grade of the subsequent 6.5ft of the parcel |
Driveway max grade (%) | Maximum grade of remainder of parcel up to the building (if building closer than 13ft then the initial and transitional grades take precedence. |
Rear Yard
This defines the graded surface at the rear of Type A lots.
Setting | Description |
Rear yard max slope (%) | Maximum grade of the rear yard |
NOTE:
If grade breaks are added around a parcel the protective slope feature lines are not added into the model. Future upgrades will automatically add a flow line (feature line) between building and parcel boundary/boundary wall.
Parcel Settings
Once the parcel has its Allsite extended data automatically added you can customise settings on a per parcel basis.
Setting | Description |
Type | This defines the type of a lot. All lots need a type and the type will determine how Level AI applies grading.
NORMAL type lots can have further refinement of their grading - see 'Normal Parcel Type'.
PUBLIC DRAINAGE lot types will not have flood fill applied to them. Use for lots that have detention/retention in them.
SUPERLOT - this can be used for parcels that will be cut up later into NORMAL type lots.
You don't need to set a PUBLIC ROAD parcel as this will automatically be created based on the road corridor. Public road parcels will have grading consistent with the crossfall of the road including daylight settings from your Assembly.
NOTE - At least 10% of parcels need to be of NORMAL type. Review comments will be added on any un-typed parcels including areas where there is no parcel defined. |
Normal Parcel Type | Only relevant to NORMAL type parcels. This tells Level AI the way the lot will grade. If set to 'Single Family' it will automatically determine whether lot will be Type A, B or C.
If no building on the lot set to one of the VACANT lot types. |
Min/Max Grade | Sets the grade tolerance for the parcel. Note - if parcel has a building on it then other grade parameters from the web Lot settings will additionally define grade on parts of the lot (building fallaway, front, rear lot grades) |
Max Cut / Fill | Define the maximum amount of cut or fill allowed for the parcel. You can set a negative value (for example a -1 foot cut on the site will mean at least 1 foot of fill used on the parcel). Common uses for this are: - Prevent excavation of ground with potential artifacts. - Avoid cutting where there is existing underground infrastructure (ie an underground gas pipe) |
Min / Max Elevation | Allow you to specify a parcel to be above a certain elevation. Some common uses for this are: - to keep out of a flood zone - to ensure parcel is elevated for views. |
Vehicle Crossing / Driveway Placement (width, location) | Configure the location of vehicle crossing (determines where potential grade breaks will be placed at the road frontage of the parcel). Location specified as High, Mid, Low - this looks at the existing surface (initial run) or the last design surface to determine location of vehicle crossing. Defaults to middle of road frontage. |
Services Connection and offset | For use with Service AI to say where it is preferrable to connect services into the parcel. |
Services Placement and offset | For use with Service AI to say where service lines should run within a parcel. For example if Sanitary pipes are preferred to run down the rear of a parcel, offset by 6 feet, then would set "Sanitary Placement" to REAR and "Sanitary Offset" to 6 ft. |
Relationships (fall to vehicle crossing) | Relationship between the pad location (ie centre of parcel) and the vehicle crossing. Specified as a min/max. This ensures the location of the building is above the road at point of vehicle crossing by a set amount. |
Normal Lot Typology
Three different 'NORMAL lot' typologies are supported for Single Family residential.
Type A - Drain to road
Type B - Split, front drains to road, back drains out back
Type C - Drain to rear
If the lot type is set to SINGLE FAMILY it automatically determines the type based on other grading parameters.
Single family lots have the additional grading features where building 'fallaways' are automatically added around the house, this ensures correct drainage.
Settings for fallaways are configurable in the web