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Gutters · Merritt Island

Gutters in Merritt Island, FL

In a 10-year storm, rain on Merritt Island can fall at 10.4 inches an hour for five minutes. That burst is the number that matters for sizing gutters here. A gutter that handles a normal shower can still overflow in one of these bursts. The right size depends on the roof area draining into each run and the slope of the gutter.

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Updated October 2026

Orange sunrise sitting low over a dark tree line reflected in calm lagoon water.
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.Our work
Photo: Sunrise seen over Merritt Island, Florida by Michael Seeley, CC BY 2.0, cropped

Sizing the run

The volume of rainwater a gutter on Merritt Island has to handle

Plumbing code sizes gutters from the flow off the roof, not from a guess. Table 1106.6 lists capacities by diameter and slope. A 6-inch half-round gutter at 1/8 inch per foot carries 110 gallons a minute, about 49 percent more than a 5-inch one at the same slope.

The same house in the same downpour with a white seamless gutter catching the runoff and a downspout discharging onto a splash block, flower bed intact (illustration)Illustration

Illustration: downpour with gutter

The design rain matters as much as the gutter size. Using the 5-minute, 10-year rate of 10.4 inches an hour, a 6-inch gutter at 1/8 inch per foot serves roughly 1,100 square feet of roof plan area by our arithmetic. Using the 100-year one-hour basis gives a much larger area, so the answer depends on the design basis.

  • Measure the roof plan area draining into each gutter run.
  • Add half the area of any vertical wall that sheds rain onto the roof.
  • Check pitch: steeper roofs need a larger design area factor.

Leaders and runoff

Downspouts, discharge and where the water goes

A 3 by 4 1/4 inch leader carries 192 gallons a minute. A downspout measuring 2 by 2 inches moves just 30 of it. On a larger Merritt Island roof, a small downspout will back water into the gutter during a heavy burst.

Florida code requires downspouts to discharge at least 1 foot from the sidewall, by underground pipe, tail extension or splash block. Merritt Island sits on a low lot where about 63 percent of the total area is water, so keep discharge well clear of the foundation.

Keeping gutters clear

Leaves, pine needles and cleaning on Merritt Island

Southern live oaks drop leaves and litter that clog gutters, and oaks, pines and melaleucas are major pollen producers. Expect pollen to fill the air from January through June, with the heaviest counts landing in March and April. Between September and November is when the bulk of pine needles come down.

Experts recommend cleaning gutters at least twice a year, and more often under overhanging trees or during frequent storms. Under oaks and pines, clean after the spring leaf drop and again before the June to September storm season.

Rain on your roof

Preset: 7.5 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Merritt Island).

9,345 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 Merritt Island: questions

How hard does it rain on Merritt Island?

In a 10-year storm, rain on Merritt Island falls at 10.4 inches an hour over five minutes, and at 3.07 inches an hour over one hour. A 24-hour rainfall reaches 7.5 inches in a 10-year storm and 13.2 inches in a 100-year storm. Those figures come from NOAA Atlas 14 for this town. Gutters should be sized to these burst rates rather than to typical showers.

Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Merritt Island 2020 Census internal point (28.3092, -80.6760), read Oct 5, 2026

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What size downspout does a Merritt Island roof need?

Downspout capacity depends on the roof area it drains. A 2 by 2 inch leader carries 30 gallons a minute, while a 3 by 4 1/4 inch leader carries 192. Plumbing code Table 1106.3 sets these capacities. A larger roof or a wall that sheds water onto the roof needs bigger leaders. Confirm the final sizing with the Brevard County building office before installing.

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

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Where should a downspout discharge on Merritt Island?

Florida code requires downspouts to discharge at least 1 foot from the building sidewall. You may use underground piping, tail extensions or splash blocks. This matters here because about 63 percent of the total area in Merritt Island is water, and a low lot holds runoff. Keep discharge away from the foundation.

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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How often should gutters be cleaned under oaks on Merritt Island?

Clean gutters at least twice a year, and more often under heavy canopy or during frequent storms. Under live oaks, leaves are a litter problem. Clean after the spring leaf drop and again before the June through September storm season. Pine needles peak from September through November, so add a late-autumn cleaning if pines overhang the roof. Many homes in the area were built around 1973, and older gutters often sag or trap debris more readily, so a quick check during each cleaning is worthwhile.

Source: thig.com, read Oct 5, 2026

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Nearby

Gutters near Merritt Island

Sources for this page(32)
  1. 1.Hurricane Irma (2017). NWS Melbourne, Post Tropical Cyclone Report: Hurricane Irma (2017). Read Oct 5, 2026.
  2. 2.NWS Melbourne, Post Tropical Cyclone Report: Hurricane Matthew (2016). Read Oct 5, 2026.
  3. 3.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Irma (AL112017). Read Oct 5, 2026.
  4. 4.Hurricane Matthew (2016). NWS Melbourne, Post Tropical Cyclone Report: Hurricane Matthew (2016). Read Oct 5, 2026.
  5. 5.Water share of total area: 63.3%. U.S. Census Bureau, 2020 Census (TIGERweb tigerWMS_Census2020 MapServer: POP100, HU100, AREALAND, AREAWATER). Read Oct 5, 2026.
  6. 6.Median year homes were built: 1973. U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates (acs2024_5yr), via Census Reporter API. Read Oct 5, 2026.
  7. 7.2023 Florida Building Code, Plumbing, 8th ed., Chapter 11 (UpCodes viewer, unofficial transcription). Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7). Source URL inherited from COM-20 (the research cites it "as COM-20").
  8. 8.NOAA Atlas 14 (HDSC Precipitation Frequency Data Server). Read Oct 5, 2026.
  9. 9.bergerbp.com. Read Oct 5, 2026.
  10. 10.2023 Florida Building Code, Residential, 8th ed., R318.5 (UpCodes viewer, unofficial transcription); FBC-Building 1503.7. Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7).
  11. 11.2023 Florida Building Code, Residential, 8th ed., Chapter 8 (UpCodes viewer, unofficial transcription). Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7). Source URL inherited from NC-2 (the research cites it "as NC-2").
  12. 12.ask.ifas.ufl.edu. Read Oct 5, 2026.
  13. 13.blogs.ifas.ufl.edu. Read Oct 5, 2026.
  14. 14.ufdcimages.uflib.ufl.edu. Read Oct 5, 2026.
  15. 15.thig.com. Read Oct 5, 2026.
  16. 16.NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Merritt Island 2020 Census internal point (28.3092, -80.6760), NOAA Hydrometeorological Design Studies Center. Read Oct 5, 2026.
  17. 17.NWS Melbourne, Post Tropical Cyclone Report: Hurricane Irma (2017), National Weather Service. Read Oct 5, 2026.
  18. 18.U.S. Census Bureau, 2020 Census (TIGERweb tigerWMS_Census2020 MapServer: POP100, HU100, AREALAND, AREAWATER), U.S. Census Bureau. Read Oct 5, 2026.
  19. 19.NOAA Atlas 14 Volume 9 version 2, partial-duration 24-hour depth estimates at the Merritt Island 2020 Census internal point (28.3092, -80.6760), NOAA Hydrometeorological Design Studies Center. Read Oct 5, 2026.
  20. 20.U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates (acs2024_5yr), via Census Reporter API, U.S. Census Bureau (via Census Reporter). Read Oct 5, 2026.
  21. 21.U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates (acs2024_5yr), via Census Reporter API, table B25024, U.S. Census Bureau (via Census Reporter). Read Oct 5, 2026.
  22. 22.2023 Florida Building Code, Building, 8th ed., Chapter 15 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  23. 23.NOAA NCEI, U.S. Climate Normals 1991-2020 (annual/seasonal), access-data API, NOAA National Centers for Environmental Information. Read Oct 5, 2026.
  24. 24.Florida Statutes, section 627.7011 (2026), Florida Legislature. Read Oct 4, 2026.
  25. 25.Brevard County, Building Code Wind Speed Maps, Brevard County. Read Oct 5, 2026.
  26. 26.U.S. Census Bureau, 2020 Census (TIGERweb tigerWMS_Census2020 MapServer: POP100, HU100, AREALAND, AREAWATER), U.S. Census Bureau. Read Oct 5, 2026.
  27. 27.Brevard County Planning & Development, Building Permits, Brevard County Planning & Development. Read Oct 5, 2026.
  28. 28.2023 Florida Building Code, Building, 8th ed., Chapter 1 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  29. 29.Florida Statutes, section 713.135 (2026), Florida Legislature. Read Oct 5, 2026.
  30. 30.FRSA, "New 2023 FBC Eighth Edition is Now in Effect", 2024-02-13, floridaroof.com. Read Oct 5, 2026.
  31. 31.Miami-Dade County RER notice, Miami. Read Oct 5, 2026.
  32. 32.NOAA Atlas 14 at Merritt Island: 10.4 in/hr (5-minute, 10-year). NOAA Atlas 14 Precipitation Frequency Data Server. Read Oct 5, 2026.

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Gutters in Merritt Island

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