All development shall comply with the provisions of the flood damage prevention provisions of subpart B, chapter 105 of the Bryan County Code of Ordinances and any other state or federal laws relating to flooding and flood management. All final plats must show the limits of flood zones and contain all appropriate references relating to special flood hazard areas (SFHA) required by the County Ordinances, FEMA, and all other applicable state and federal laws.

(Ord. No. 06-2020, § 3, 12-8-2020)

All development shall comply with the provisions of the soil erosion and sedimentation control provisions of subpart B, chapter 111 of the Bryan County Code of Ordinances and any other state or federal laws relating to soil erosion and sedimentation control, including related provisions of this UDO.

(Ord. No. 06-2020, § 3, 12-8-2020)

(a)

Development requiring subdivision or site plan approvals are subject to the provisions of this section and applicable standards of the Engineering Design Manual.

(b)

Prior to approval of construction plans or a site plan, a certificate from the applicant's engineer stating that the proposed development will meet or exceed all applicable requirements for stormwater management in accordance with the Engineering Design Manual and that no detrimental impacts will be imposed on any adjacent and/or downstream properties as a result of the project shall be submitted.

(c)

Each site plan and subdivision shall incorporate stormwater management facilities sufficient to reduce pre-development peak discharge rates across adjacent property lines. The Stormwater Management Report (Drainage Study) shall specifically analyze the discharge point(s) for pre and post stormwater runoff for the proposed development.

(d)

No subdivision or site plan development shall be undertaken unless the applicant can establish to the engineering director that the flood potential within the subdivision, on adjacent or surrounding lands or wetlands will not be increased by the development of such subdivision. If such potential is in question, the engineering director shall make the final determination.

(e)

Inter-basin transfer of water between river basins is prohibited.

(f)

All applications for site plan approval shall include a map at appropriate scale of all site areas to be covered by impervious surfaces and calculations of said areas. Any change to [an] impervious surface after approval by the engineering director will require updated maps and the approval of the engineering director.

(g)

All roadside drainage features shall be piped, including such features as ditches, swales, streams, and canals, unless otherwise allowed by this UDO.

(Ord. No. 06-2020, § 3, 12-8-2020)

(a)

Applicability.

(1)

All new development or substantial redevelopment of a site accommodating multi-family residential, residential recreation, commercial, institutional, or industrial uses shall provide green infrastructure to manage stormwater runoff on-site as identified in this section or the Georgia Coastal Stormwater Supplement, whichever standards are more stringent. Substantial redevelopment includes:

a.

Improvements with a cost exceeding 50 percent of the building's assessed value;

b.

Increases in impervious coverage on a site that exceed the greater of ten percent of the existing impervious cover or 2,500 square feet of impervious cover; or

c.

Resurfacing or modification of the hardscape of a parking lot other than restriping.

(2)

All new development or substantial redevelopment shall prepare and submit a drainage report/stormwater management plan together with the site plan submittal. This requirement does not apply to development of a single family or duplex lot.

a.

A minimum of 50 percent of the site's required landscaping area, as required by this code, shall consist of green infrastructure.

b.

Hardscape, including but not limited to parking spaces, drive aisles, walkways, outdoor vehicular storage areas, and gathering spaces are encouraged to be surfaced with pervious paving where feasible.

(b)

Green infrastructure types.

(1)

Green infrastructure (GI) for planting areas includes:

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a. Bioswales;
b. Bioretention cells;
c. Constructed wetlands;
d. Dry detention basins;
e. Stormwater planters; and
f. Green roofs.

 

(2)

Green infrastructure that does not require planting includes:

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a. Infiltration Trenches;
b. Cisterns and underground stormwater chambers, constructed for detention;
c. Retention ponds.

 

(3)

Design and construction of hardscape surfaces, including but not limited to parking spaces, drive aisles, walkways, and gathering spaces with pervious paving.

(4)

Alternative green infrastructure designs that the engineering director determines will safely and efficiently manage stormwater.

(Ord. No. 06-2020, § 3, 12-8-2020)

(a)

Artificial or natural waterways, lakes, or ponds for recreation shall not be accepted for maintenance by the county.

(b)

Waterways, lakes, and ponds shall be maintained by either an established homeowners' association or individual property owner(s). In either case, the final plat must indicate who will be responsible for maintenance. Detention and retention basins shall be maintained by a homeowners' association. The county will not accept maintenance of drainage basins.

(c)

Private maintenance provisions must be made to the satisfaction of the engineering director. The developer is not allowed to be designated as the responsible provider of maintenance.

(Ord. No. 06-2020, § 3, 12-8-2020)

Subdivisions abutting rivers or streams shall comply with all laws relating to the development of land adjacent to rivers, streams, or marshlands.

(Ord. No. 06-2020, § 3, 12-8-2020)