How are existing contour lines typically shown on a landscape plan?

Existing contour lines are typically represented using continuous dashed lines on a landscape plan. This convention allows for a clear distinction between existing terrain features and proposed changes or new features. By using dashed lines, landscape architects and designers indicate to viewers that these lines signify the original landscape, as opposed to features that may be newly added or altered as part of the design. This method of representation ensures that anyone reviewing the plans can easily interpret how the existing land contours will interact with the proposed elements of the landscape design. Additionally, adhering to this standard helps maintain consistency across various plans and documents used in the field, aiding in communication among contractors, engineers, and clients.