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f IL Id ? , K 5. ` *? ' i* ' v *'= �: E k ;=.. + ,.z3� 't '�e,�d. '' . ' r � t, cw.; ri ' ? e"d �, ., YF -� :st " + ' : .. . r ; , _ ax. < �,� -. . 10 -Riviera fine sand . This soil is nearly level and poorly drained . It is on low hammocks and in poorly defined drainageways and broad , low sloughs . The mapped areas range from 20 to 50 acres . Slopes are smooth to concave and range from 0 to 2 percent . Typically , the surface layer is very dark grayish brown fine sand about 3 inches thick . The subsurface layer is 23 inches thick . The upper 11 inches of the subsurface layer is light gray fine sand , and the lower 12 inches is light brownish gray fine sand . The subsoil extends to a depth of 40 inches . The upper 5 inches of the subsoil is gray sandy loam that has intrusions and pockets of grayish brown and dark grayish brown fine sand . The lower 9 inches is gray sandy loam . The substratum to a depth of 80 inches or more is gray and greenish gray loamy fine sand that has a few pockets of light brownish gray fine sand . Included with this soil in mapping are small areas of Holopaw , Floridana , Manatee , Oldsmar, Pineda , Wabasso , and Winder soils . Also included are areas of soils that have a weakly stained layer of organic material above the subsoil and extending into it and also other areas of soils that have small fragments or nodules of iron cemented sandstone or calcareous material at a depth of 10 to 30 inches . The included soils make up less than 15 percent of the map unit. The water table is within a depth of 10 inches of the surface for 1 to 6 months and between a depth of 10 to 40 inches for more than 6 months . It recedes to a depth of more than 40 inches during extended dry periods . The water table is above the surface for short periods after heavy rainfall . The available water capacity is very low in the surface and subsurface layers , low in the upper part of the subsoil and moderate in the lower part , and low in the substratum . Permeability is rapid in the surface and subsurface layers , slow to very slow in the subsoil , and moderately rapid in the substratum . Natural fertility and the organic matter content are low . A large part of the acreage of this soil has been cleared and is planted to citrus . Natural vegetation consists of scattered slash pine , cabbage palm , waxmyrtle , scattered palmetto , laurel oak , blue maidencane , pineland threeawn , creeping bluestem , south Florida bluestem , sand cordgrass , low panicums , and various weeds and grasses . Under natural conditions , this Riviera soil is poorly suited to cultivated crops . However, it is fairly suited to vegetable crops if a water control system is installed to remove excess water rapidly and provide for subsurface irrigation . Soil improving crops and crop residue should be used to protect the soil from erosion and maintain organic matter. Seedbed preparation should include bedding of rows . Fertilizer should be applied according to the need of the crop . Suitability of this soil for citrus trees is good if a water control system is installed to maintain the water table at a depth of about 4 feet. Planting the trees on beds provides good surface drainage . A close-growing cover crop between tree rows protects the soil from blowing . Regular applications of fertilizers should be applied . This soil has good suitability for pasture and hay crops . Pangolagrass , improved bahiagrass , and clover grow well if properly managed . Management practices should include a water control system to remove excess surface water after heavy rains , regular applications of fertilizer, and controlled grazing . The potential productivity of this soil for pine trees is moderately high . South Florida slash pine is the best adapted specie to plant . Water control measures are necessary to remove excess surface water. Equipment limitations and seedling mortality are the main concerns in management . This soil is highly suited to desirable range plant production . The dominant forage is creeping bluestem , chalky bluestem , and blue maidencane . Management practices should include deferred grazing and brush control . Riviera soil is in the Cabbage Palm Flatwoods range site . This soil has severe limitations for building site development, sanitary facilities , and recreational uses . Water control measures are needed to overcome excessive wetness . The sandy surface layer should be stabilized for recreational uses . Sidewalls of shallow excavations should be shored . This Riviera soil is in capability subclass lllw .