Inadequate Outfalls
Fairfax County
Updated Oct 8, 2026
About this dataset
<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><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>
Data and resources (11)
- HTML
ArcGIS Hub Dataset
Modified May 8, 2026
- ArcGIS
ArcGIS GeoService
Modified May 8, 2026Map preview available
- CSV
CSV
Modified Oct 8, 2026Table and Data API available
- ZIP
Shapefile
Modified May 8, 2026Map preview available
- GeoJSON
GeoJSON
Modified May 8, 2026Map preview available
- KML
KML
Modified May 8, 2026Map preview available
- ZIP
File Geodatabase
Modified May 8, 2026
- TXT
Feature Collection
Modified May 8, 2026
- XLSX
Excel
Modified Oct 8, 2026Table and Data API available
- GPKG
GeoPackage
Modified May 8, 2026
- GDB
SQLite Geodatabase
Modified May 8, 2026