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(3) The. requirement of a maintenance easement area and the prohibition of o bstructions in subsection (m)(2) may be waived in part or in whole by the Public Works director basedon site and design characteristics, which may include the following: 1) the ability to maneuver and operate maintenance equipment as necessary, 2) preservation of existing trees and native vegetation, and 3) proposed landscaping improvements. Generally, landscaping within the maintenance area must be designed using groups of plantings not exceeding 50 feet in length with a minimum separation of 100 feet between planting groups. Between such groupings'a 10 foot wide access path shall be maintained. The county shall not be responsible for restoration of any damage to the landscaping that may occur in the event the county performs maintenance within the maintenance area. (4) The design of retention or detention facilities within a For single-family residential development retention and detention facilities above and below - shall meet slope requirements of the county and any other agency that may employ such criteria. Such retention o r detention facilities designed to impound more than two feet of water shall be graded to slopes no steeper than four -foot horizontal to one -foot vertical (4:1) to a minimum depth of two (2) feet below the control elevation, or a properly designed retaining wall shall, be used. Drainage systems that will n ot impound more than two feet of water shall not exceed slopes of three- foot horizontal to one -foot vertical (3:1) unless otherwise approved by the county or provided for under specific design criteria by other sections of the Land Development Regulations. (5) Drainage systems, in all developments on all other than single family residential developments, shall maintain maximum slopes wide of two (2). horizontal to one (1) vertical for swales Tess than or equal to ene (1) foot two (2) feet deep and three (3) horizontal to one (1) vertical for all swales more than one (1) foot two (2) feet deep. (6) Dry retention slopes and wet retention slopes above the design normal or control to water elevation shall be grassed or otherwise stabilized. Retention or detention ponds with any area having more than two feet of water at design storm or permanent pool with the exception of ponds, or lakes, in golf courses, public parks or in developments in which the pond, or Take is designed to serve as an aesthetic amenity to the development, shall be fenced with a minimum four -foot high fence as determined by the Public Works director. (s) The applicant shall wizI4 demonstrate that the development project is n ot in a special flood hazard area zone. 1. A special flood hazard area zono shall encompass all lands subject to inundation by the one hundred -year regulatory flood including lands in 7