Gutters · Brownsville

Gutters in Brownsville, FL

NOAA Atlas 14 puts a 10-year, 5-minute burst at 10.9 inches an hour for Brownsville. Gutters here have to move that surge, not an average day of rain. A run sized for light showers can overflow in one storm cell and spill against the walls and foundation.

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Updated October 2026

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.

Sizing for local rain

The volume of rainwater your gutters have to handle in Brownsville

Gutter size depends on how fast rain arrives, not only on how much falls in a day. Here a 1-hour rain in a 10-year storm falls at 3.38 inches an hour, and a 100-year storm reaches 5.25 inches an hour. The 24-hour total in a 10-year storm is 8.47 inches. A gutter that handles the short burst is the one to plan around.

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

The state plumbing code sizes horizontal gutters from the flow off the roof. A 5-inch half-round gutter at 1/8 inch per foot slope carries 74 gallons per minute, and a 6-inch size carries 110. By our arithmetic, the 6-inch gutter carries about 49 percent more than the 5-inch, so the bigger size is the safer choice on a long roof run.

Downspouts must match the gutter. A 2 1/2 by 3 inch leader takes 92 gallons per minute under the plumbing table, while a 3 by 4 1/4 inch leader takes 192. Add half the area of any wall that sheds rain onto the roof, since that water reaches the gutter too.

Discharge and placement

Where the downspout water must go on your lot

Under Florida's residential code, buildings with eaves that stick out less than 6 inches need gutters and downspouts. Each downspout should discharge water at least 1 foot clear of the foundation wall. Pipe it underground, use a tail extension, or set a splash block, but keep the water away from the foundation.

Metal and approved plastic gutters are allowed for outdoor exposure, with joints that are lapped, soldered or caulked. Confirm the work with Miami-Dade County Regulatory and Economic Resources, which issues permits for this unincorporated community.

Keeping gutters clear

Leaves, pollen and cleaning in a Brownsville yard

Southern live oaks shed leaves and fruit that become a litter problem, and oaks and pines are major pollen producers in Florida from January to June. Many Brownsville homes are older, with a median build year of 1966, so clogged gutters on an aging roof are common to see.

Clean gutters after the spring oak drop and pollen, before the June through September rain season, and again after pine needles fall in late autumn. Under heavy canopy, clean more often. Blocked runs in this yard can send water into walls and footings.

Rain on your roof

Roof area (square feet)Rain (inches)

Preset: 8.47 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Brownsville).

10,554 gallons run off that roof, all of it toward the gutters and downspouts.

Math: square feet × inches × 0.623 gallons.

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Questions

Gutters in Brownsville: questions

How much rain does Brownsville get in a storm?

A 5-minute downpour in a 10-year storm in Brownsville falls at 10.9 inches an hour, according to NOAA Atlas 14. A 1-hour rain in the same storm falls at 3.38 inches an hour, and the 24-hour total is 8.47 inches. Gutters need to move the short, heavy burst, not only the daily total. Ask a roofer to size the gutter run and each downspout to these rates.

Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Brownsville 2020 Census internal point (25.8216, -80.2418), read Oct 5, 2026

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How big should my gutters be for Brownsville rain?

The plumbing code lists a 5-inch half-round gutter at 1/8 inch per foot slope at 74 gallons per minute, and a 6-inch size at 110. Based on our math, the 6-inch size moves roughly 49 percent more water. Choose the size from the roof area draining into each run and the local burst rate, which is 10.9 inches an hour for a 5-minute 10-year storm.

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

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How far from my house must downspouts discharge?

Each downspout must release water at least 1 foot beyond the outside wall of the structure. Options include routing the water through buried pipe, adding a tail extension, or setting a splash block below the downspout. Keep the water away from the foundation. Brownsville homes here have a median build year of 1966, so check older foundations and grading for water pooling after storms.

Source: 2023 Florida Building Code, Residential, 8th ed., R318.5 (UpCodes viewer, unofficial transcription); FBC-Building 1503.7, read Oct 5, 2026

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