Contour Survey
A contour survey (also called a topographic survey) is a detailed survey that maps the elevation and shape of the land surface. It uses contour lines to represent changes in elevation, showing hills, valleys, slopes, and flat areas. Here’s a simple breakdown of what a contour survey description typically includes:
🔍 Contour Survey Description (Example)
Project Name: Residential Development – Lot 12, Hillside Road
Location: Lot 12, Hillside Road, Boulder, CO
Date of Survey: April 2025
Surveyor: Summit Land Surveying Inc.
Coordinate System: State Plane Coordinate System, NAD83
Vertical Datum: NAVD88
Purpose:
To determine the existing topography of the subject property for planning and design of residential construction.
Survey Description:
This contour survey identifies the existing ground elevations and topographic features across Lot 12. Contour intervals are shown at 1-foot intervals, with all elevations referenced to the NAVD88 vertical datum. Major features such as buildings, trees, utility poles, drainage paths, and property boundaries are included for context. The site slopes generally from north to south, with elevations ranging from 5,230 ft to 5,245 ft.
Key Observations:
- Steepest slope is approximately 12% along the western boundary.
- A natural drainage swale runs diagonally through the southeast corner.
- Existing driveway graded to approx. 5% slope.
- Area is suitable for stepped foundation construction due to elevation changes.
Deliverables:
- Digital AutoCAD DWG file with 2D contour lines
- PDF map with contour overlay and feature labels