Any equipment shelters and unenclosed equipment, machinery, and utility infrastructure associated with a micro hydropower facility shall be provided with a fence, screen, and/or landscaping, where deemed necessary by the Planning Board, sufficient to protect public safety and to screen such equipment from view year-round from existing residences, adjoining properties, and public rights-of-way. The retention and enhancement of existing vegetation, the introduction of substantial new vegetation, and the introduction of earthen beaming shall be considered the preferred means to satisfy these screening requirements. Any required fences, screens, and landscaping installed in accordance with this section shall, as a condition of the special permit, be maintained in good order to achieve the objectives stated herein throughout the duration of the use. The Planning Board shall determine the types of plant materials and depth of the needed buffer based on site conditions.