Gravel, Stone and Soil Delivery in Palm Bay, FL

Depressional sand and a high water table

The USDA soil survey maps Myakka sand, depressional, at the center point of ZIP 32905. Myakka accounts for 85 percent of the map unit. The word depressional means the unit sits in low spots where water collects and stands.^[1]

Myakka at this spot is rated very poorly drained. Its hydrologic group is B/D: it acts like group D while the water table is high and like group B where the ground has been drained. The sand itself lets water through, but there is often nowhere for that water to go because the water table sits so close to the surface.^[1]

The top layer is sand, loose and nearly free of clay. Shrink-swell in the top 100 cm is low, at 1.5 percent, so the ground does not heave or crack as it wets and dries. Loose sand still shifts under load, which is why a firm base matters for any drive or patio.^[1]

The USGS state geologic map places the Anastasia Formation at the center point, a Pleistocene unit of sand and limestone. Its shelly limestone and sand formed along old shorelines.^[2]

Drainage across low, sandy ground in this part of Florida can depend on swales and ditches that carry water off the land. A lot on depressional sand behaves far better when its own grading ties into that network instead of fighting it.^[1]

The land at the ZIP's center point stands just 20 feet above sea level.^[3]

Rain by the bucket

Weather normals come from the NOAA station at Melbourne Intl AP, FL, about 5 miles away. It averages 50.8 inches of precipitation a year, much of it in short, heavy storms.^[4]

Lows at Melbourne reach 32 F or colder on only 2 days in a normal year.^[4]

The station's median last freeze date is January 20, and its median first freeze date is January 12. Freezes are rare enough that frost heave does not shape material choices here.^[4]

Water is the real issue. A heavy rain on very poorly drained sand can leave standing water in a yard for days, and a gravel surface laid flat at grade can sit in it. Every project in ZIP 32905 starts with the question of where the water will go.^[1],[4]

A single storm in a wet climate like this can drop a heavy load of rain in one afternoon. Gravel surfaces with plenty of loose fines can wash out under that kind of flow, so clean stone or a well-compacted base with a crown holds up better.^[4]

Raising a drive above wet sand

On depressional ground, the first step is height. Build the drive up above the surrounding yard with Fill Sand or Fill Dirt, compacted in layers, so the base sits above the wettest zone. A crowned surface sheds rain to both sides.^[1]

Lay a woven geotextile over the compacted fill. On loose sand, fabric keeps the stone from sinking and spreads the load. Then add Road Base or Crushed Concrete in thin lifts, wetting and rolling each one until it is firm.^[1]

Crushed Concrete suits wet ground well. Its broken edges lock tightly, and once compacted it forms a firm layer that resists the softening loose sand suffers in a wet season. Road Base does the same job with quarried stone, so the choice can come down to what is easiest to source and spread.^[1]

Finish with Driveway Gravel or 3/4" Crushed Stone. Pea Gravel and other rounded stone roll on sand and should stay on paths. Asphalt Millings pack well in Florida heat and make a dark, firm surface for a long driveway or a parking pad.^[1]

Shallow swales along each side of the drive, lined with #57 Crushed Stone or Drain Rock, collect runoff and let it soak away slowly.^[4]

Walk the drive after the first big storm. Low spots that hold water show where the base needs another lift of Road Base. Adding stone to a puddle without fixing the base only pushes the soft spot deeper.^[1],[4]

Draining the yard and the house

With 50.8 inches of rain a year at Melbourne and a water table close to the surface, drainage stone belongs in most yard plans. Drain Rock or #57 Crushed Stone in a fabric-lined trench moves water away from foundations and patios toward a swale or ditch.^[1],[4]

A French drain works where there is somewhere lower for water to go. Where the whole yard sits low, raising beds and walkways above grade may help more than any trench.^[1]

River Rock under downspouts stops splash erosion in sand. Riprap protects the bank of a drainage ditch or swale where fast water would otherwise cut into it.^[1]

Shell-rich limestone and sand of the Anastasia Formation lie beneath the soil at the center point. Yard trenches usually stay in the loose sand above that layer, where water moves freely once the water table drops.^[2]

Beds and lawns in sandy ground

Sand holds very little organic matter. Garden Soil in raised beds gives plants a richer root zone, and Compost worked into existing beds helps the sand hold nutrients.^[1]

On ground that stays wet, raised beds are often the only way to keep roots out of standing water after summer storms. Topsoil spread over low spots and graded away from the house can help a lawn drain.^[1]

Plants suited to wet flatwoods tolerate soggy roots far better than most lawn grasses, and a bed of them in the lowest corner of a yard can turn a problem spot into a garden.^[1]

Sandy soil dries fast in the sun between storms even when it floods right after them. A mulch layer evens out those swings, and Compost raises the sand's ability to hold water near the roots.^[1],[4]

Mulch is common in Florida beds. Brown Shredded Mulch, Black Shredded Mulch and Red Mulch hold moisture during dry spells and keep weeds down. Wood Chips cover play areas, and Playground Sand fills a sandbox.^[1]

Homes in ZIP 32905

ZIP 32905 lies in Brevard County. The Census counts 12,728 housing units in the ZIP, and 49 percent are detached single-family houses.^[5]

Homes in ZIP 32905 have a median build year of 1984, and owners live in 56 percent of the occupied units.^[5]

Palm Bay as a whole counts 50,147 housing units. Detached houses make up 84 percent of the city's stock, and the citywide median year built is 1993.^[5]

The ZIP's median build year is older than the city's, and older yards may have drives and walks that have settled or cracked. A regraded gravel apron or a new path of Walkway Gravel can replace them without fresh concrete.^[5]

The Florida Department of Transportation calls for Graded Aggregate Base under Section 204 of its Standard Specifications for Road and Bridge Construction.^[6]