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Description: This feature class includes streams draining a watershed with a drainage area of greater than 70 acres. A high-resolution Digital Elevation Model (DEM) of the county, created from over 1.1 million spot elevations, was used to create synthetic stream networks at 70ac a threshold. Contact: Department of Public Works & Environmental Services, Dipmani Kumar Data Accessibility: Publicly Available Update frequency: As needed Creation date: 1/1/2004
Copyright Text: Fairfax County, Virginia; Land Development Services
Description: Estimated flood plain areas. Streams draining a watershed with a drainage area of greater than 70 acres but less than 360 acres (i.e. "minor floodplains") were buffered 100 feet on each side.A high-resolution Digital Elevation Model (DEM) of the county, created from over 1.1 million spot elevations, was used to create synthetic stream networks at 70ac a threshold. This synthetic stream network was then used to create a floodplain stream centerline for streams draining a watershed with a drainage area of greater than 70 acres but less than 360 acres (i.e. "minor floodplains"). The synthetic stream network was then used as the stream centerline to which the buffer was applied. Therefore, the gridded stream network was used to both locate the centerline against which the buffer was applied, and to determine the drainage area at any given point along a stream.
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[0, 0, 0, 255] Background Color: N/A Outline Color: N/A Vertical Alignment: bottom Horizontal Alignment: center Right to Left: false Angle: 0 XOffset: 0 YOffset: 0 Size: 8 Font Family: Arial Font Style: normal Font Weight: normal Font Decoration: none
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[0, 0, 0, 255] Background Color: N/A Outline Color: N/A Vertical Alignment: bottom Horizontal Alignment: center Right to Left: false Angle: 0 XOffset: 0 YOffset: 0 Size: 8 Font Family: Arial Font Style: normal Font Weight: normal Font Decoration: none
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>This dataset is a selection of known erosion and flooding problems throughout the County. The data is intended primarily to assist site plan preparers with establishing the existence of known erosion and flooding problems. </SPAN></SPAN></P><P><SPAN>Increased volumes of sheet flow that will cause or contribute to erosion, sedimentation, or flooding of down gradient properties or resources shall be diverted to a stormwater management facility or a stormwater conveyance system that conveys the runoff without causing down-gradient erosion, sedimentation, or flooding per stormwater Management Ordinance 124-4-4.E. Minimum Standard (MS) 19 of the Virginia Erosion and Sediment Control Regulations (9VAC25-840-40.19) requires stormwater discharge from permitted projects be diverted to an adequate conveyance or detention facility.</SPAN></P><P><SPAN><SPAN>This data documents known inadequacies in the stormwater conveyance system. Plan preparers should and County staff will use this information when evaluating compliance with requirements to discharge storm water to an adequate system or detention facility.</SPAN></SPAN></P><P><SPAN><SPAN>The erosion and flooding problems identified in the layer were determined using the following county datasets: </SPAN></SPAN></P><UL><LI><P><SPAN>Stream Physical Assessment 1.0 Erosion </SPAN></P></LI><LI><P><SPAN>Stream Physical Assessment 1.0 Reach Habitat</SPAN></P></LI><LI><P><SPAN>Stream Physical Assessment 1.0 Head Cuts </SPAN></P></LI><LI><P><SPAN>Stream Physical Assessment 2.0 </SPAN></P></LI><LI><P><SPAN>Open Channel Inspections</SPAN></P></LI><LI><P><SPAN>Stormwater Planning Division Investigation </SPAN></P></LI></UL><P><SPAN><SPAN>Contact: Land Development Services</SPAN></SPAN></P><P><SPAN><SPAN>Data Accessibility: Publicly Available</SPAN></SPAN></P><P><SPAN><SPAN>Update Frequency: As Needed</SPAN></SPAN></P><P><SPAN><SPAN>Last Revision Date: </SPAN></SPAN><SPAN><SPAN>1/11/2021</SPAN></SPAN></P><P><SPAN><SPAN>Creation Date: </SPAN></SPAN><SPAN><SPAN>1/11/2021</SPAN></SPAN></P><P><SPAN><SPAN>Layer Name: LDSAMGR.INADEQUATE_OUTFALL_POUR_POINTS</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Copyright Text: Fairfax County, Virginia; Land Development Services
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>This dataset is a selection of known erosion and flooding problems throughout the County. The data is intended primarily to assist site plan preparers with establishing the existence of known erosion and flooding problems. </SPAN></SPAN></P><P><SPAN><SPAN>Increased volumes of sheet flow that will cause or contribute to erosion, sedimentation, or flooding of down gradient properties or resources shall be diverted to a stormwater management facility or a stormwater conveyance system that conveys the runoff without causing down-gradient erosion, sedimentation, or flooding per Stormwater Management Ordinance 124-4-4.E. Minimum Standard (MS) 19 of the Virginia Erosion and Sediment Control Regulations (9VAC25-840-40.19) requires stormwater discharge from permitted projects be diverted to an adequate conveyance or detention facility.</SPAN></SPAN></P><P><SPAN><SPAN>This data documents known inadequacies in the stormwater conveyance system. Plan preparers should and County staff will use this information when evaluating compliance with requirements to discharge storm water to an adequate system or detention facility.</SPAN></SPAN></P><P><SPAN><SPAN>The erosion and flooding problems identified in the layer were determined using the following county datasets: </SPAN></SPAN></P><UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI><P><SPAN><SPAN>-Stream Physical Assessment 1.0 Erosion </SPAN></SPAN></P></LI><LI><P><SPAN>-Stream Physical Assessment 1.0 Reach Habitat</SPAN></P></LI><LI><P><SPAN><SPAN>-Stream Physical Assessment 1.0 Head Cuts </SPAN></SPAN></P></LI><LI><P><SPAN><SPAN>-Stream Physical Assessment 2.0 </SPAN></SPAN></P></LI><LI><P><SPAN><SPAN>-Open Channel Inspections </SPAN></SPAN></P></LI></UL><P><SPAN><SPAN>Contact: Land Development Services</SPAN></SPAN></P><P><SPAN><SPAN>Data Accessibility: Publicly Available</SPAN></SPAN></P><P><SPAN><SPAN>Update Frequency: As Needed</SPAN></SPAN></P><P><SPAN><SPAN>Last Revision Date: </SPAN></SPAN><SPAN><SPAN>9/212021</SPAN></SPAN></P><P><SPAN><SPAN>Creation Date: </SPAN></SPAN><SPAN><SPAN>9/21/2021</SPAN></SPAN></P><P><SPAN><SPAN>Layer Name: LDSAMGR.INADEQUATE_OUTFALLS</SPAN></SPAN></P></DIV></DIV></DIV>
Copyright Text: Fairfax County, Virginia; Land Development Services