Inadequate Outfalls Pour Points

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. 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. 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. The erosion and flooding problems identified in the layer were determined using the following county datasets: Stream Physical Assessment 1.0 Erosion Stream Physical Assessment 1.0 Reach Habitat Stream Physical Assessment 1.0 Head Cuts Stream Physical Assessment 2.0 Open Channel Inspections Stormwater Planning Division Investigation Contact: Land Development Services Data Accessibility: Publicly Available Update Frequency: As Needed Last Revision Date: 1/11/2021 Creation Date: 1/11/2021 Layer Name: LDSAMGR.INADEQUATE_OUTFALL_POUR_POINTS本数据集收录了全县范围内已探明的水土流失与洪涝灾害问题点位，主要用于协助场地规划编制人员确认已知的水土流失与洪涝灾害问题的存在情况。根据《雨水管理条例124-4-4.E》，当坡面径流量增加并将引发或加剧下坡向地块或资源的水土流失、泥沙淤积或洪涝灾害时，需将径流导入雨水管理设施或雨水输送系统，以在输送径流的同时避免造成下坡向的水土流失、泥沙淤积或洪涝灾害。《弗吉尼亚州水土流失防治法规（9VAC25-840-40.19）》中的最低标准19（MS 19）要求，获批项目的雨水排放需接入合格的输送或滞留设施。本数据集记录了雨水输送系统中已探明的缺陷问题。场地规划编制人员及该县工作人员在评估项目雨水排放是否符合接入合格输送或滞留设施的相关要求时，均可使用本数据集信息。 本图层所识别的水土流失与洪涝灾害问题，基于以下县级数据集判定得出： 1. 河流物理评估1.0版 侵蚀（Stream Physical Assessment 1.0 Erosion） 2. 河流物理评估1.0版 河段生境（Stream Physical Assessment 1.0 Reach Habitat） 3. 河流物理评估1.0版 溯源侵蚀（Stream Physical Assessment 1.0 Head Cuts） 4. 河流物理评估2.0版 明渠巡查（Stream Physical Assessment 2.0 Open Channel Inspections） 5. 雨水规划部门调查（Stormwater Planning Division Investigation） 联系方式：土地开发服务处（Land Development Services） 数据可及性：公开可用 更新频率：按需更新 最后修订日期：2021年1月11日 创建日期：2021年1月11日 图层名称：LDSAMGR.INADEQUATE_OUTFALL_POUR_POINTS