R 560.302 Field survey data.

Rule 302. (1) The purpose of this rule is to prescribe field survey data required before submittal of a preliminary plat. (2) A proprietor shall furnish, on request by the department of natural resources, plotted valley cross-sections from a control point downstream of the proposed plat to the upstream limits of the plat for any watercourse through or adjacent to the area to be subdivided. The spacing between the cross-sections shall be frequent enough to define the changes in the hydraulic properties of the watercourse. The location of each cross-section shall be shown on a topographic map and elevations shall be at either national geodetic vertical datum or international Great Lakes datum. The required field surveys shall be conducted under the supervision of an engineer or land surveyor licensed in this state. (3) A proprietor shall furnish, on request by the department of natural resources, current water surface elevations and past high water elevations for any lake which is within or is adjacent to the area to be subdivided. A determination of the drainage area contributing runoff to the lake and an engineering sketch of any water level control structures may also be required. All elevations shall be at national geodetic vertical datum or international Great Lakes datum. The required field surveys shall be conducted under the supervision of an engineer or land surveyor licensed in this state. (4) If the subdivision is affected by a 100-year floodplain, a permanent benchmark based on either of the datums listed in subrules (2) and (3) of this rule shall be established within the plat boundaries and described on the preliminary plat. This benchmark shall be established under the supervision of an engineer or land surveyor licensed in this state.