Potential Sump Conditions

The Potential Sump Conditions layer is the result of analysis performed on the 2018 Light Detection and Ranging (LiDAR) derived, Bare Earth Digital Elevation Model (DEM) and LAS Dataset. Please see the Data Capture Methodology section of this document for detailed information on how this dataset was created. This dataset is intended for internal use to aid in the following use cases: Tool to assess existing site conditions when responding to service requests for structural, yard and road flooding. Tool to assess existing site conditions and potential impact of localized change in topography during redevelopment on adjacent properties if in sumps. Tool to assess potential impact of overwhelmed stormwater inlets in sumps on adjacent structures due to ponding of stormwater runoff. In concert with other spatial and field information, tool to prioritize sump conditions where structures may potentially be impacted based on depth of ponding, overland drainage area, and elevation of ground-level openings in structure. Tool to determine topographic features of the sump area including inflows, outflow, and extents. Ensure that proposed elevations of entry points into redeveloped structures (ie. areaways, walk-in basements, window wells) are adequately protected or situated away from the sumps if part of the redeveloped property is in a sump. Contact: Land Development Services Data Accessibility: Publicly Available Update Frequency: As Needed Last Revision Date: 12/15/2020 Creation Date: 12/15/2020 Layer Name: LDSAMGR.POTENTIAL_SUMP_CONDITIONS潜在积水坑状况图层（Potential Sump Conditions layer）是基于2018年激光雷达（Light Detection and Ranging, LiDAR）生成的裸地数字高程模型（Bare Earth Digital Elevation Model, DEM）与LAS数据集（LAS Dataset）开展分析后得到的成果。有关本数据集的具体制作流程，请参阅本文档的“数据采集方法”章节。 本数据集仅供内部使用，旨在辅助以下应用场景： 1. 响应结构、场地及道路内涝服务诉求时，评估现有场地状况； 2. 评估现有场地状况，以及再开发过程中局部地形变化对处于积水坑范围内的周边地块的潜在影响； 3. 评估积水坑内过载雨水口因风暴雨水径流滞留，对周边建构筑物造成的潜在影响； 4. 结合其他空间与实地信息，基于积水滞留深度、地表汇水面积以及建构筑物地面开口高程，对可能受影响的积水坑状况进行优先级排序； 5. 确定积水坑区域的地形特征，包括汇流入水口、泄出水口及范围； 6. 确保再开发建构筑物的入口点（例如：地下通道区、步入式地下室、采光井）的拟定高程得到充分防护；若再开发地块部分处于积水坑范围内，则需将此类入口设置在远离积水坑的位置。 联系方式：土地开发服务部 数据可及性：公开可用 更新频率：按需更新 最近修订日期：2020年12月15日 创建日期：2020年12月15日 图层名称：LDSAMGR.POTENTIAL_SUMP_CONDITIONS