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Pishagqua Subaqueous Soils

Soil Map Unit Description from the RI Soil Survey Report (2010 Update)

WPa0: Pishagqua silt loam, 0 to1 meter water depth (2010 Update for the RI Coastal Zone Soil Survey Phase I - please download the latest copy of the spatial data).

This subaqueous soil is found on the nearly level or slightly undulating portion of submerged, low-energy basins in estuaries and coastal lagoons (lagoon bottoms) and in mainland coves. Mapped areas are irregular in shape and range from 0.5 to 56 hectares (1 to 140) acres in size. The slope ranges from 0 to 3 percent.

Typically, this soil has a very fluid, black, silt loam or silty clay loam surface, 10 to 20 cm thick. The subsoil is fluid, black, silt loam or silty clay loam to a depth of 100 to 200 cm or more. Shell fragments range from 0 through 15 percent throughout and typically include soft shell clam, quahog, oyster, periwinkle, and razor clam. Macroalgal and plant fragments are commonly found throughout the soil profile.

Pishagqua soils are permanently submerged in up to 1 meter of salt or brackish water. All horizons have a neutral pH in place and will develop a strongly acidic pH after oxidation. This soil contains highly sulfidic materials throughout that if drained or dredged and exposed to air, will oxidize and create acid sulfate drainage.

Included with this soil in mapping are small areas of Fort Neck soils on similar lagoon bottom landscapes and in coves and small areas of Billington soils in coves. Included areas make up 10 percent of this map unit.

These soils often support eelgrass beds and are habitat for multiple marine organisms including finfish, shellfish, and polychaetes.

Link to Official Series Description - Pishagqua| Soil Profile Photo of Pishagqua Series

UPDATE: The Coastal Zone of Rhode Island is currently being updated and re-mapped, for more information on this update visit: www.mapcoast.org


WPa1: Pishagqua silt loam, 1 to 2 meter water depth (2010 Update for the RI Coastal Zone Soil Survey Phase I - please download the latest copy of the spatial data).

This subaqueous soil is found on the nearly level or slightly undulating portion of submerged, low-energy basins in estuaries and coastal lagoons (lagoon bottoms) and in mainland coves. Mapped areas are irregular in shape and range from 0.5 to 56 hectares (1 to 140) acres in size. The slope ranges from 0 to 3 percent.

Typically, this soil has a very fluid, black, silt loam or silty clay loam surface, 10 to 20 cm thick. The subsoil is fluid, black, silt loam or silty clay loam to a depth of 100 to 200 cm or more. Shell fragments range from 0 through 15 percent throughout and typically include soft shell clam, quahog, oyster, periwinkle, and razor clam. Macroalgal and plant fragments are commonly found throughout the soil profile.

Pishagqua soils are permanently submerged beneath 1 to 2 meters of salt or brackish water. All horizons have a neutral pH in place and will develop a strongly acidic pH after oxidation. This soil contains highly sulfidic materials throughout that if drained or dredged and exposed to air, will oxidize and create acid sulfate drainage.

Included with this soil in mapping are small areas of Fort Neck soils on similar lagoon bottom landscapes and in coves and small areas of Billington soils in coves. Included areas make up 10 percent of this map unit.

These soils often support eelgrass beds and are habitat for multiple marine organisms including finfish, shellfish, and polychaetes. Some areas have native algae cover.

Link to Official Series Description - Pishagqua| Soil Profile Photo of Pishagqua Series

UPDATE: The Coastal Zone of Rhode Island is currently being updated and re-mapped, for more information on this update visit: www.mapcoast.org


WPa2: Pishagqua silt loam, 2 to 3 meter water depth (2010 Update for the RI Coastal Zone Soil Survey Phase I - please download the latest copy of the spatial data).

This subaqueous soil is found on the nearly level or slightly undulating portion of submerged, low-energy basins in estuaries and coastal lagoons (lagoon bottom) and in mainland coves. Mapped areas are irregular in shape and range from 0.5 to 80 hectares (1 to 200) acres in size. The slope ranges from 0 to 3 percent.

Typically, this soil has a very fluid, black, silt loam or silty clay loam surface, 10 to 20 cm thick. The subsoil is fluid, black, silt loam or silty clay loam to a depth of 100 to 200 cm or more. Shell fragments range from 0 through 15 percent throughout and typically include soft shell clam, quahog, oyster, periwinkle, and razor clam. Macroalgal and plant fragments are commonly found throughout the soil profile.

Pishagqua soils are permanently submerged beneath greater than 2 meters of salt or brackish water. All horizons have a neutral pH in place and will develop a strongly acidic pH after oxidation. This soil contains highly sulfidic materials throughout that if drained or dredged and exposed to air, will oxidize and create acid sulfate drainage.

Included with this soil in mapping are small areas of Fort Neck soils on similar lagoon bottom landscapes and in coves and small areas of Billington soils in coves. Included areas make up 10 percent of this map unit.

This soil generally does not support rooted vegetation. Some areas have native algae cover. Vegetative cover is less than 10 percent.

Link to Official Series Description - Pishagqua| Soil Profile Photo of Pishagqua Series

UPDATE: The Coastal Zone of Rhode Island is currently being updated and re-mapped, for more information on this update visit: www.mapcoast.org


WPd: Pishagqua silt loam, 2 to 5 meter water depth, dredged phase (2010 Update for the RI Coastal Zone Soil Survey Phase I - please download the latest copy of the spatial data).

This subaqueous soil is found dredged areas of the lagoon bottom in coastal lagoons or bays. These areas are often maintained for marinas or boat passage. Mapped areas are irregular in shape and range from 0.5 to 8 hectares (1 to 20) acres in size. The slope ranges from 0 to 3 percent.

Typically, this soil has a very fluid, black, silt loam or silty clay loam surface, 10 to 20 cm thick. The subsoil is fluid, black, silt loam or silty clay loam to a depth of 100 to 200 cm or more. Shell fragments range from 0 through 15 percent throughout and typically include soft shell clam, quahog, oyster, periwinkle, and razor clam. Macroalgal and plant fragments are commonly found throughout the soil profile.

These soils are permanently submerged beneath greater than 2 meters of salt or brackish water. All horizons have a neutral pH in place and will develop a strongly acidic pH after oxidation. This soil contains highly sulfidic materials throughout that if drained or dredged and exposed to air, will oxidize and create acid sulfate drainage.

Included with this soil in mapping are small areas of Fort Neck soils on similar lagoon bottom landscapes. Included areas make up 10 percent of this map unit.

This soil generally does not support rooted vegetation. Some areas have native algae cover. Vegetative cover is less than 10 percent.
 

Link to Official Series Description - Pishagqua| Soil Profile Photo of Pishagqua Series

UPDATE: The Coastal Zone of Rhode Island is currently being updated and re-mapped, for more information on this update visit: www.mapcoast.org