Gutters · Dunedin

Gutters in Dunedin, FL

In Dunedin, a 10-year storm drops rain at 9.84 inches an hour for five minutes, and Dunedin is 54.6 percent water by area. Gutters here have to carry that short burst off the roof, not just the daily total. Undersized gutters can overflow in minutes. The sizing, code and drainage points below follow from that number.

Request a quote 407-242-2840

Updated October 2026

Tree-lined downtown street with parked cars and colorful shopfronts under a clear blue sky. — Photo: Dunedin FL downtown01 by Ebyabe, CC BY-SA 3.0, cropped

Drone view of a single-story home with a brown-gray shingle roof and box vents under large oak trees, a metal carport roof in the corner and a street behind. — Photo: Dunedin FL downtown01 by Ebyabe, CC BY-SA 3.0, cropped

Sizing for the burst

How heavy rain sizes Dunedin gutters and downspouts

Size gutters for the short burst, because that is when a small gutter overflows first. In Dunedin the 10-year five-minute rate is 9.84 inches an hour, and the 25-year rate is 11.2. A steeper roof sheds water faster, so the design figure rises with pitch.

Close-up of a fine stainless micro-mesh gutter guard over a white gutter at a shingle roof edge, with oak leaves, catkins and raindrops resting on top (illustration)

Illustration: micro mesh guard

Table 1106.6 of the plumbing code lists gutter capacity in gallons per minute. A 6-inch half-round gutter at 1/8 inch per foot slope carries 110 gallons per minute, about 49 percent more than a 5-inch one at the same slope. By our arithmetic, the 6-inch size gives more room on a large roof against a 9.84 inch-per-hour burst.

Check downspouts separately. A 2-by-2-inch leader handles 30 gallons per minute, while a 3-by-4-inch or 4-inch round leader handles 192. Add half the area of any wall that sheds rain onto the roof before choosing the size.

Keeping water off the foundation

Downspout discharge and where the water goes

Florida code requires gutters with downspouts on homes with eaves under 6 inches, and each downspout must discharge at least 1 foot from the sidewall. Dunedin is 54.6 percent water by area, so many lots sit low and wet and a short downspout can leave water pooling against the foundation. Confirm the discharge route with the City of Dunedin building office.

Run the discharge underground, use a tail extension, or set a splash block at least 1 foot out.
Confirm each downspout empties onto ground that slopes away from the house.

Live oaks and pines drop heavy debris in Central Florida. Experts recommend cleaning gutters at least twice a year, and more often under heavy canopy. Clogged gutters can cause water damage, mold and foundation problems, so time the cleaning around the oak leaf drop and the late-autumn pine-needle peak.

Rain on your roof

Roof area (square feet)Rain (inches)

Preset: 7.1 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Dunedin).

8,847 gallons run off that roof, all of it toward the gutters and downspouts.

Math: square feet × inches × 0.623 gallons.

Request a quote

Questions

Gutters in Dunedin: questions

How heavy does rain get in Dunedin?

A 5-minute downpour in a 10-year storm falls at 9.84 inches an hour in Dunedin, and a 25-year storm reaches 11.2. A 24-hour rain in a 10-year storm totals 7.1 inches. Gutters should be sized for the short burst, because that is when water overwhelms a gutter that is too small. Pinellas County also gets about 52 to 54 inches of rain a year, so the design basis matters. Confirm the numbers with your installer.

Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Dunedin 2020 Census internal point (28.0257, -82.8154), read Oct 5, 2026

Related: Gutters

What size gutter does a Dunedin home need?

The answer depends on your roof area, pitch and the rain burst you design for. A 6-inch half-round gutter at 1/8 inch per foot slope carries 110 gallons per minute under the plumbing code, while a 5-inch one carries 74. Because Dunedin's five-minute bursts reach 9.84 inches an hour and the median home was built in 1976, many older gutters were likely sized for lighter assumptions. Ask for the design calculation in writing.

Source: 2023 Florida Building Code, Plumbing, 8th ed., Chapter 11 (UpCodes viewer, unofficial transcription), read Oct 5, 2026

Related: Gutters

Where should downspouts drain on a Dunedin lot?

Florida code requires each downspout to discharge at least 1 foot from the building's sidewall, whether by underground piping, a tail extension or a splash block. With water covering 54.6 percent of Dunedin's total area, many lots drain poorly, so check that the water flows away from the house. The City of Dunedin building office can confirm the local details for your permit.

Source: 2023 Florida Building Code, Residential, 8th ed., Chapter 8 (UpCodes viewer, unofficial transcription), read Oct 5, 2026

Related: Gutters

Nearby