Planning board approves zoning text amendment setting impervious-surface limits and driveway standards

The planning board unanimously approved ZTA case ZTA-2503, a city-initiated zoning text amendment that establishes new definitions and limits for pervious and impervious surfaces, sets driveway standards and front-yard tree requirements, and incorporates a state statutory exemption for synthetic turf pending Department of Environmental Protection (DEP) standards.

Linda Louise, the city’s zoning administrator, presented the amendment and told the board the change is intended "to ensure predictability for homeowners" by clarifying definitions and codifying standards for pervious and impervious surfaces, driveways and related drainage requirements. She said staff’s analysis shows the proposed maximum impervious percentages are consistent with current observed conditions and do not impose greater restrictions than current practice.

The amendment replaces the term "lot coverage" with "building coverage" for clarity and creates a separate definition for "pervious surface" while clarifying "impervious surface." Louise said impervious surface calculations will explicitly include building footprint, driveways and required impervious parking. Staff recommended approval under the zoning-code amendment criteria in section 16.1.54(b) of the zoning code.

Staff described proposed maximum impervious-surface percentages for residential zoning districts and gave examples from the table in the presentation: for an agricultural/residential district the maximum overall impervious coverage would be 40% (60% pervious) and for low-density residential the maximum impervious coverage would be 60% (40% pervious). Louise said those percentages were developed from an in-depth parcel analysis and staff review of existing policies.

The text amendment also sets a maximum residential driveway width of 30 feet. Louise said current city policy allows a 12-foot driveway as standard and that driveways may be expanded to 30 feet when an owner provides certification that on-site drainage requirements can be met. She said the 30-foot maximum "is not more restrictive than the current practices in the city" and is intended to acknowledge parking needs while protecting drainage.

The amendment requires at least one tree be planted within the front yard; Louise said the live oak is "one of the preferred trees on our list," and that proper pruning and maintenance are expected as part of tree upkeep.

On synthetic turf, Louise said the amendment includes an exemption for single-family residential properties under one acre "based on state statute," but clarified that the city "still wouldn't be permitting any synthetic turf until DEP actually publishes those standards." In short, the amendment defers to the state DEP standards once they are formally published.

Board members asked clarifying questions during the public hearing. Louise said the amendment will apply to new construction and to existing properties that apply for permits: legally permitted existing features would not be made nonconforming retroactively, but when an owner seeks a new permit for work such as a patio expansion or driveway increase they would need to comply with the code in effect at that time.

The board opened the item for public comment, noted speakers on the list, closed the public hearing after public remarks and then voted. A motion to approve ZTA-2503 was made and seconded; the board voted unanimously in favor and the amendment passed.

At the end of the meeting staff announced a planning officials workshop scheduled for Friday, Nov. 21 at the Jupiter City Hall campus; registration assistance was offered and further details will be circulated to board members. The board also confirmed upcoming meeting dates of Nov. 13 and Dec. 11.