City staff say tides, not just rain, drive recurring flooding on North Clearwater Beach; pump stations proposed

Sam Riley, a public works staffer, told the Environmental Advisory Board on July 16 that frequent street flooding at North Clearwater Beach is largely caused by tides overtopping seawalls rather than only by rainfall. “NOAA defines nuisance flooding as water in streets or yards at about 2.73 feet, NAVD88,” Riley said, and he presented tide-gauge data showing multiple overtopping events since 2012 and a cluster of high water days in 2023–24.

Riley and Marcus Lawrence, the city’s public works director, said the city is proposing stormwater pump stations to speed drainage when tides are high. Lawrence said the stormwater pump stations are a separate project from sanitary sewer lift-station work and “provide immediate relief” by allowing stormwater to be pumped out when tidal valves prevent gravity drainage. City staff estimated a single pump-station installation would likely fall in a $1 million to $2 million range once final designs are complete.

Board members and residents asked how pump stations would work when seawalls are overtopped. Riley and Lawrence said pumps can reduce the duration of nuisance flooding and help with rain-driven events that would otherwise be trapped by high tides, but they will not prevent damage when water rises above the seawall and enters homes. Lawrence said the pump stations are intended as a near-term adaptation: “This pump station project is really a near-term solution to help us get through the next, you know, decade, two decades.”

Staff described related steps: installing tide (check) valves to prevent backflow into pipe networks, raising electrical components and generators above expected flood elevations, modeling to copy successful designs to other low-lying neighborhoods and coordinating with Army Corps and county permitting for higher outfall capacity. Marcus Lawrence said the city is pursuing grants, including Hazard Mitigation Grant Program funds, and that $42 million appearing in the 2026 budget is a multi-year seed for a multi-phase North Beach effort rather than a single-year expenditure.

Board members pressed staff on limits of local authority: raising private seawalls and privately held lift stations involves legal and policy constraints. Staff said county and state rules affect what the city can require and that property-by-property differences make design complex. On scale, staff said the North Beach area includes roughly 600–625 homes and that about two-thirds of that area is more frequently affected by high-tide or “blue-sky” flooding, depending on the elevation and storm scenario.

Residents and board members urged more public outreach, signage and neighborhood engagement. Cassie Cordova, a city director who led later discussion of communications, asked the board to consider letters of support for grant applications and to help share digestible summaries of technical reports. Staff said they will produce outreach materials and that the public can help by supporting grant applications and by helping coordinate basin-level cooperation on seawalls and other private measures.

Questions remain about long-term adaptation: how high seawalls should be set citywide, how pump capacity should scale with projected sea-level rise, and what properties the city could or should buy or elevate. Staff said pump stations are expected to be modular and repeatable, and that larger sea-level adjustments will require long-term policy and funding work.

Ending

The board took no formal vote on the North Beach project itself; the discussion was advisory and focused on next steps: continued modeling, design refinement, permit coordination and targeted grant applications. Staff asked board members to consider writing letters of support for grant applications and offered to return with more refined maps, costs and timeline detail at a future meeting.