| Description | |||
| Abstract: Represents Subwatersheds. The subwatersheds are based upon the City of Richmond 1970 Annexation Area Drainage Study, Overall Drainage Map. The drainage study, conducted by J.K. Timmons and Assoc. in 1983 only includes the part of Richmond that was annexed in 1970 and the subwatersheds do not extend beyond the boundaries of the drainage study. Timmons used the CBPA Ordinance map and other external resources to delineate the subwatersheds inside the larger watersheds. | |||
| Purpose: The Subwatersheds were developed in conjunction with the Stormwater Asset Management project to be used as a reference and to participate in analysis involving the Stormwater geometric network and other drainage layers. Subwatersheds are a resource to further improve watershed management, water quality initiatives, watershed modeling and resource inventory and assessment. The ability to identify locations within watersheds and to perform spatial analysis on watersheds and subwatersheds is also supported. | |||
| Supplemental Information: The subwatersheds feature class was digitized from the scanned and registered raster version of the City of Richmond 1970 Annexation Area Drainage Study, Overall Drainage Map. The drainage study, conducted by J.K. Timmons and Assoc. in 1983 only includes the part of Richmond that was annexed in 1970 and the subwatersheds do not extend beyond the boundaries of the drainage study. Timmons used the CBPA Ordinance map and other external resources to delineate the subwatersheds inside the larger watersheds. There are some discrepancies in boundaries. Some subwatersheds overlap another watershed. Additionally, the CBPA Ordinance map only includes watershed boundaries inside Richmond city limits so the watersheds appear to be "clipped" to the city boundary. The Timmons map includes the entire watershed boundary but only for those watersheds that are in the annexed area. There are also some discrepancies between the names of the watersheds from Timmons' source data and Richmond's source data. These discrepancies are visible in the data. Each boundary was drawn according to the source data and the discrepancy is accounted for in the attributes with the Alternate watershed name (Alt_Wshed_Name) and the Id (Alt_Wshed_Id) from the Watersheds layer. Please be sure to read the Watershed metadata for additional pertinent information. Internal documentation and background about the Watersheds project: Q:\Infrastructure\Geodatabase\Datasets\Hydrology\Watersheds.doc Q:\Infrastructure\Geodatabase\Datasets\Hydrology\StormWater_Zbig\Watersheds_metadata\ | |||
| Contact | |||
| Custodian: | Zbigniew Brodzik | ||
| Department: | Information Technology | ||
| Position: | GIS Project Manager | ||
| Address: | 400 Jeff Davis Hwy | ||
| City: | Richmond | ||
| State: | Virginia | ||
| Zip Code: | 232224 | ||
| Email: | Zbigniew.Brodzik@richmondgov.com | ||
| Time Period of Content | |||
| Date: | 200304 | ||
| Status | |||
| Progress: | In work | ||
| Update Frequency: | As needed | ||
| Spatial Domain | |||
| West Coordinate: | -77.602620 | ||
| East Coordinate: | -77.447380 | ||
| North Coordinate: | 37.560648 | ||
| South Coordinate: | 37.455286 | ||
| Spatial Data Information | |||
| Data Type: | vector digital data | ||
| Data Format: | SDE Feature Class | ||
| Data Projection: | Lambert Conformal Conic | ||
| Access and Usage Information | |||
| Access Constraints: | none | ||
| Use Constraints: | All GIS layers and datasets are owned by the City of Richmond and can not be modified, re-distributed, and/or re-sold without a sub-licensing agreement. All guarantees of validity expire once a dataset leaves the City of Richmond firewall or physical premises. Acknowledgement of the City of Richmond GIS would be appreciated in products derived from these data. | ||
| Entity and Attribute Information | |||
| Entity Name: | vector.ric.hydr_SubWatershed | ||
| Entity Type: | Feature Class | ||
| Entity Count: | 113 | ||