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Chapter 910: Shoreland Overlay District Planned-Unit Developments <br />Page 910-14 <br />c. Open space must include areas with physical characteristics unsuitable for <br />development in their natural state, and areas containing significant historic sites <br />or unplatted cemeteries; <br />d. Open space may include outdoor recreational facilities for use by owners of <br />dwelling units or sites, by guests staying in commercial dwelling units or sites, <br />and by the general public; <br />e. Open space may include subsurface sewage treatment systems if the use of the <br />space is restricted to avoid adverse impacts on the systems; <br />f. Open space must not include commercial facilities or uses, but may contain <br />water-oriented accessory structures or facilities; <br />g. The appearance of open space areas, including topography, vegetation, and <br />allowable uses, must be preserved by use of restrictive deed covenants, <br />permanent easements, public dedication and acceptance, or other equally <br />effective and permanent means; and <br />h. The shore impact zone, based on normal structure setbacks, must be included as <br />open space. For residential PUDs, at least fifty (50) percent of the shore impact <br />zone area of existing developments or at least seventy (70) percent of the shore <br />impact zone area of new developments must be preserved in its natural existing <br />state. For commercial PUDs, at least fifty (50) percent of the shore impact zone <br />must be preserved in its natural state. <br />3. Erosion Control and Storm Water Management. <br /> Erosion control, storm water management plans, and Best Management Practices must be <br />developed and the PUD must: <br />a. Be designed, and the construction managed, to minimize the likelihood of serious <br />erosion occurring either during or after construction. This must be accomplished <br />by limiting the amount and length of time of bare ground exposure. Temporary <br />ground covers, sediment entrapment facilities, vegetated buffer strips, or other <br />appropriate techniques must be used to minimize erosion impacts on surface <br />water features. Erosion control plans approved by a soil and water conservation <br />district may be required if project size and site physical characteristic warrant; <br />and <br />b. Be designed and constructed to effectively manage reasonably expected <br />quantities and qualities of storm water runoff. Impervious surface coverage <br />within any tier must not exceed twenty-five (25) percent of the tier area, except <br />that for commercial PUDs thirty-five (35) percent impervious surface coverage <br />may be allowed in the first tier of general development lakes with an approved <br />storm water management plan and consistency with Section 910.030 of this <br />Ordinance. <br />c. Be designed to be consistent with the City of Little Canada Erosion Control <br />Ordinance (Section 928) and Stormwater Ordinance (Section 927). <br />4. Centralization and Design of Facilities. <br /> Centralization and design of facilities and structures must be done according to the <br />following standards: <br />a. Planned unit developments must be connected to publicly owned water supply <br />and sewer systems.