| River and Stream Corridor Overlay District of Loudoun County, VA (2009) | |
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Data format: SDE Feature Class File or table name: GISDBB.GISBROW.RSCOD_POLY Coordinate system: Lambert Conformal Conic Theme keywords: environment, inlandWaters, planningCadastre, environment, river, historic, overlay, district, streams, floodplain |
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Abstract:
RSCOD Metadata/Map Disclaimer
The Circuit Court of Loudoun County issued an opinion dated March 30, 2004 ruling that the River and Stream Corridor Overlay District (RSCOD) is void. The Floodplain Overlay District (FOD) and the Scenic Creek Valley Buffer regulations in effect prior to adoption of the RSCOD on January 6, 2003, will apply in the administration of zoning regulations. The March 30, 2004 decision may be the subject of an appeal.
The River and Stream Corridor Overlay District (RSCOD) was created in the 2001 Comprehensive Plan. It was created to protect corridor resources, including water quality, aquatic and wildlife habit, and scenic value.
RSCOD is composed of:
a. Rivers and streams draining 100 acres or more
b. 100-year floodplains (includes major and minor)
c. adjacent steep slopes (25% or greater), starting within 50 feet of streams and floodplains but extending no further than 100 feet beyond
d. 50-foot management buffer around steep slopes and floodplain
e. 100-foot buffer measured from the scar line on both sides of streams that drain 100 acres or more
f. 300-foot buffers around state designated scenic rivers (Goose Creek,Bull Run, Catoctin Creek from the bridge at Route 698 at Waterford to the Potomac River); the Potomac River, and County reservoirs (Beaverdam and Goose Creek) the originating stream or floodplain |
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Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
RSCOD Metadata/Map Disclaimer The Circuit Court of Loudoun County issued an opinion dated March 30, 2004 ruling that the River and Stream Corridor Overlay District (RSCOD) is void. The Floodplain Overlay District (FOD) and the Scenic Creek Valley Buffer regulations in effect prior to adoption of the RSCOD on January 6, 2003, will apply in the administration of zoning regulations. The March 30, 2004 decision may be the subject of an appeal. The River and Stream Corridor Overlay District (RSCOD) was created in the 2001 Comprehensive Plan. It was created to protect corridor resources, including water quality, aquatic and wildlife habit, and scenic value. RSCOD is composed of: a. Rivers and streams draining 100 acres or more b. 100-year floodplains (includes major and minor) c. adjacent steep slopes (25% or greater), starting within 50 feet of streams and floodplains but extending no further than 100 feet beyond d. 50-foot management buffer around steep slopes and floodplain e. 100-foot buffer measured from the scar line on both sides of streams that drain 100 acres or more f. 300-foot buffers around state designated scenic rivers (Goose Creek,Bull Run, Catoctin Creek from the bridge at Route 698 at Waterford to the Potomac River); the Potomac River, and County reservoirs (Beaverdam and Goose Creek) the originating stream or floodplain
This data layer provides a visual interpretation of the overlay as defined in the zoning ordinance. This GIS layer is composed of: Flood Plain - boundaries reflect the limits of flooding resulting from a storm having an occurrence probability of 1% - identified as the 100-year storm. Data are collected through engineering studies and recompiled on to the County's 1:2400 scale base map. Floodplains are dynamic natural systems and are likely to change over time. The floodplain boundaries are updated as better information becomes available through detailed engineering studies. Any areas that are designated as 'major floodplain' (drains > 640 acres) are also shown as a Special Flood Hazard Area on FEMA's Flood Insurance Rate Maps. Steep Slopes are derived from the soil layer. Data was originally collected via a soil survey conducted between 1947 and 1952 and late recompiled by the County soil scientist onto the County's 1:2400 base map, following National Cooperative Soil Survey standards. Soil data are continuously updated based on site inspections. See the Loudoun County Interpretative Guide to the Use of Soils Maps for more information. 100' Buffers exist around rivers and streams that drain more than 100 acres. Streams derived from County base map data, Which was compiled at 1:2400 and fits National Map Accuracy Standards. Data was buffered from scar lines (i.e. banks); where only the stream centerline was available,an average width of 16' for streams draining minor floodplain (DRAIN_SIZE = 2 in the DRAINS layer) and major floodplain (DRAIN_SIZE = 3) was added to the 100' buffer. 300' Buffers exist around County reservoirs Beaverdam and Goose Creek, the Potomac River, and state designated scenic rivers Goose Creek, Bull Run, and Catoctin Creek (designated from the bridge at route 698 at Waterford to the Potomac). Reservoirs and scenic rivers were derived from County base map data, which was compiled at 1:2400 and meets National Map Accuracy Standards. The Potomac River boundary was also derived from County base map data; it is the mean water mark of the river on the Virginia side (this was taken from the County boundary data layer). 50' Management Buffer exists around the flood plain and steep slope data.
Data are stored in the corporate ArcSDE Geodatabase as a polygon feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN (vertical datum, if applicable, NAVD88), US Survey foot units.
publication date
Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user. These data were generated for use by Loudoun County and are available to the public. These data are intended for use at 1:2400 scale or smaller. Acknowledgement of Loudoun County would be appreciated in products derived from this data.
1 Harrison Street SE, 3rd Floor
MS 62
Retention of attribute accuracy throughout the coverage to geodatabase feature class coversion process was ensured by a QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have, on a record by record basis, identical attribution when comparing all concatenated fields to all the user-defined attribution.
Topologically clean
RSCOD Metadata/Map Disclaimer The Circuit Court of Loudoun County issued an opinion dated March 30, 2004 ruling that the River and Stream Corridor Overlay District (RSCOD) is void. The Floodplain Overlay District (FOD) and the Scenic Creek Valley Buffer regulations in effect prior to adoption of the RSCOD on January 6, 2003, will apply in the administration of zoning regulations. The March 30, 2004 decision may be the subject of an appeal. Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.
Retention of coordinate accuracy throughout the coverage to geodatabase feature class conversion process was ensured by a QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have the same record total, and on a record by record basis, area, perimeter, and length differential of less than +/- 0.5%.
2001 Comprehensive Plan for new zoning ordinance
Floodplain Data derived from engineering studies performed by SCS or from specific engineering studies. Slope and drainage data originated from soil survey first conducted in 1947 and revised by the Loudoun County soil scientist. Water bodies were originally created in 1978 for the County's base mapping project. Data were converted to digital in the early 1980s.
This data set was part of a batch process that converted legacy data from ArcInfo coverage in Librarian to a single-tiled ArcInfo coverage in preparation for a final coversion to ArcSDE Geodatabase Feature Classes. Data were extracted from Librarian using the EXTRACT TOPOLOGICAL command. Multi-tiled data sets were extracted into multiple coverages and then combined based on the feature type(s). Layers with both polygon and arc feature classes were processed with the Arc commands, MAPJOIN and DISSOLVE. Arc feature classes alone were processed with the Arc commands, APPEND and DISSOLVE. Layers with both arc and point feature classes and point feature classes alone were processed with the Arc command, APPEND. When used, the Arc command, DISSOLVE, was given with the <#all> option. All coverages were then reprojected to HARN 83 using the following .prj file specifications: INPUT PROJECTION STATEPLANE UNITS FEET ZONE 5551 DATUM NAD27 NADCON PARAMETERS OUTPUT PROJECTION STATEPLANE UNITS FEET FIPSZONE 4501 DATUM HPGN NADCON PARAMETERS END This dataset was then converted to a feature class in a geodatabase in ArcSDE.
Unique code to describe corridor area
Loudoun County
Source that created or edited feature class
Loudoun County
Date feature class created or modified
Loudoun County
Not for public distribution. Internal User ID of editor creating or modifying feature class
Loudoun County
Feature geometry.
ESRI
Internal feature number.
ESRI
RS_RCODE: Unique code to describe corridor area
Code Area 1 100 year floodplain (drains 100 to 640 acres ) 2 100 year floodplain (drains greater than 640 acres) 3 adjacent steep slopes (25% or greater) 4 managment buffer (50' buffer) 5 minimum stream buffer (100' on streams or 300' state scenic river/reservoir 8 not part of RSCOD 15 100 year floodplain (drains 100 to 640 ac) within minimum stream buffer 25 100 year floodplain (drains > 640 ac) within minimum stream buffer 35 adjacent steeps slopes(25% or greater) within minimum stream buffer 45 management buffer (50') within minimum stream buffer
RS_UPD_SOURCE: Source that created or edited feature class
Source Definition 0 Undetermined 1 Legacy 2 County 3 Contract
1 Harrison Street S.E., 2nd floor
MS 65
Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user.
ESRI Personal Geodatabase Feature Class
ESRI Shapefile
AutoCad Digital Exchange File
Size limit: 4.5 GB. Visit our website at: http://www.loudoun.gov/omagi, click on "Loudoun County Mapping Documents & Order Forms." The "Forms" directory will lead you to custom & standard (countywide) data order forms. Hardcopy maps may also be available; please contact the Mapping Office Public Information Counter for more information regarding all data requests.
1 Harrison Street SE, 2nd Floor
MS 65