9.10.2. - Types of Riparian Buffers and Naturally Occurring Ponds and Lakes.
Riparian buffers shall be clearly indicated on all development plans, site plans, preliminary plats and final plats.
Where maps show a difference in stream type for a particular reach of stream, the map that shows the greater level of stream protection shall apply.
(1) Riparian Buffer Size: Riparian buffers shall apply on each side of the stream and shall begin at the most landward limit of the top of the bank perpendicular to the direction of stream flow. Riparian buffers shall be a minimum of 50 feet in width for perennial streams and 30 feet in width for intermittent streams.
(2) Riparian Buffer Use Limitations: Land within the riparian buffer shall not serve to meet minimum lot size requirements, except on property zoned A-O, Agriculture/Open Space, or LDR, Low Density Residential, where at least 50 percent of the required lot area is outside the riparian buffer.
(a) Buildings and other features that require grading and construction shall be set back at least ten feet from the edge of the riparian buffer.
(b) To avoid a loss of effectiveness in protecting streams, the riparian buffer shall remain in natural undisturbed vegetation except as provided by this section or allowed pursuant to a variance approved by the Planning Committee in accordance with Section 12.14, Variances. Riparian buffers within any Mixed Use Zoning District may be landscaped rather than left in an undisturbed state, at the discretion of the property-owner in accordance with an approved revegetation plan.
(c) Any use allowed by this section shall be designed and constructed to minimize the amount of intrusion into the riparian buffer and to minimize clearing, grading, erosion and water quality degradation.
(d) Crossings by streets, driveways, railroads, recreational features, intakes, docks, utilities, bridges or other facilities shall be allowed provided that they are designed to minimize the amount of intrusion into the riparian buffer. Such facilities may run generally within and parallel to the riparian buffer only where no alternative location is practical and when their design minimizes the amount of intrusion of the riparian buffer.
(e) Stormwater control structures and temporary erosion control structures shall be considered utilities for the purposes of this section and may be allowed in riparian buffers provided that:
(i) The property owner or applicant demonstrates to the satisfaction of the City Public Works Director or City Engineer, or their designees, as appropriate, that such facilities cannot be practicably located outside of the riparian buffer, and that any proposed stormwater control structure is sited and designed to minimize disturbance of the stream and riparian buffer. Siting stormwater control structures away from the stream channel shall be considered preferable to siting such structures in the stream channel;
(ii) Alternate methods of stormwater and erosion control shall be considered prior to approval of such structures in the riparian buffers; and
(iii) A vegetated buffer of a width determined by the City Public Works Director or the City Engineer, or their designees, as appropriate, may be required around the stormwater control structures.
(iv) Sanitary sewer lines, on an alignment generally parallel to the stream, may be allowed in riparian buffers, provided that:
(v) The property owner or applicant demonstrates to the satisfaction of the City Public Works Director or the City Engineer, or their designees, as appropriate, that the lines cannot be practicably located outside of the riparian buffer;
(vi) Design and construction specifications minimize damage to the stream and the possibility of line leakage; and,
(vii) The line is generally located at least 35 feet from the top of the stream bank and the easement is no closer than 20 feet from the top of the bank.
(viii) Riparian buffers may be used for passive recreational activities, such as trails, provided that service facilities for such activities, including but not limited to parking, picnicking and sanitary facilities, are located outside of the riparian buffer.