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ORDINANCE 2007- 012 residential developments, the maintenance area shall be located entirely within the stormwater management tract and shall not be part of any lot. If proposed lots or tracts are to be under separate ownership, then the maintenance area shall be connected to an ingress -egress or other appropriate easement, or public right-of-way, having a minimum width of fifteen (15) feet. Open channels and swales in single-family residential developments shall be located within easements that are a minimum of fifteen (15) feet wide for access and maintenance. (3) The requirement of a maintenance easement area and the prohibition of obstructions in subsection (m)(2) may be waived in part or in whole by the public works director based on site and design characteristics, which may include the following: 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 fifty (50) feet in length with a minimum separation of one hundred (100) feet between planting groups. Between such groupings a ten -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 single-family residential development shall meet slope requirements of the county and any other agency that may employ such criteria. Such retention or detention facilities designed to impound more than two (2) 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 not impound more than two (2) 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 other than single-family residential developments, shall maintain maximum slopes of two (2) horizontal to one (1) vertical for swales less than or equal to two (2) feet deep and three (3) horizontal to one (1) vertical for all swales more than two (2) feet deep. Underline: Additions to Ordinance 59 Stfileglr: Deleted Text from Existing Ordinance FXommunity Development\Users\CurDev\ORDINANCE\2007\2007- 901, 911, 913, 926, 930, & 934 Landscaping.RTF