Open Channels

Update date: from GISP repository on 2/6/25. This is a static dataset. Data Type: polyline data An open channel is digitized from paper or scanned imagery. Subtypes: Improved: An open drainage course confined with lined or unlined embankments. Unimproved: A natural drainage course graded to channelize storm water. Swale: A graded depression with relatively low slope to channelize storm water. Ditch: A trench provided to channelize storm water. Attributes: Most of the feature classes in this storm drain geometric network share the same GIS table schema. Only the most critical attributes per operations of the Los Angeles County Flood Control District are listed below: Attribute Description ASBDATE The date the design plans were approved "as-built" or accepted as "final records". CROSS_SECTION_SHAPE The cross-sectional shape of the pipe or channel. Examples include round, square, trapezoidal, arch, etc. DIAMETER_HEIGHT The diameter of a round pipe or the height of an underground box or open channel. DWGNO Drain Plan Drawing Number per LACFCD Nomenclature EQNUM Asset No. assigned by the Department of Public Works (in Maximo Database). MAINTAINED_BY Identifies, to the best of LAFCD's knowledge, the agency responsible for maintaining the structure. MOD_DATE Date the GIS features were last modified. NAME Name of the individual drainage infrastructure. OWNER Agency that owns the drainage infrastructure in question. Q_DESIGN The peak storm water runoff used for the design of the drainage infrastructure. SOFT_BOTTOM For open channels, indicates whether the channel invert is in its natural state (not lined). SUBTYPE Most feature classes in this drainage geometric nature contain multiple subtypes. 1 = Improved, 2 = Unimproved, 3 = Ditch, 4 = Swale UPDATED_BY The person who last updated the GIS feature. WIDTH Width of a channel in feet. This Storm Drain Dataset is a work in progress, and all users of this data are STRONGLY ENCOURAGED to obtain the most current copy, available for download at the LA County eGIS Hub site. Terms of Use This data is derived from the County Cadastral Landbase and features are typically added to this dataset per recorded 'as-built' drawings. Accurate facility locations on the ground must be determined by qualified field personnel. If any errors are found, or if there are general questions, please contact the individuals listed in the Credits. This product is for information purposes and should not be used for legal, engineering, or survey purposes. County assumes no liability for any errors or omissions.更新日期：2025年2月6日取自GISP仓库。本数据集为静态数据集。数据类型：折线数据（polyline data）。明渠要素由纸质图纸或扫描影像矢量化提取。 子类型： 改良型：采用衬砌或非衬砌堤岸约束的明渠排水通道。 未改良型：经坡度修整以疏导雨水的天然排水通道。 洼地排水渠（Swale）：坡度相对平缓的修整型洼地，用于疏导雨水。 沟渠（Ditch）：用于疏导雨水的开挖沟槽。 属性：本雨水管网几何网络中的多数要素类共用同一GIS表格架构。下文仅列出洛杉矶县防洪区（Los Angeles County Flood Control District, LAFCD）运营所需的核心属性字段： ASBDATE：设计方案获批「竣工实测」或被认定为「最终备案记录」的日期。 CROSS_SECTION_SHAPE：管道或渠道的横截面形状，示例包括圆形、方形、梯形、拱形等。 DIAMETER_HEIGHT：圆形管道的直径，或地下箱涵、明渠的高度。 DWGNO：按照洛杉矶县防洪区（LAFCD）命名规则编制的排水工程图纸编号。 EQNUM：由公共工程部在Maximo数据库（Maximo Database）中分配的资产编号。 MAINTAINED_BY：据洛杉矶县防洪区（LAFCD）所知，标识负责维护该设施的机构。 MOD_DATE：GIS要素的最后修改日期。 NAME：单个排水基础设施的名称。 OWNER：涉事排水基础设施的所属机构。 Q_DESIGN：用于排水基础设施设计的峰值雨水径流量。 SOFT_BOTTOM：针对明渠，标识渠底是否处于天然状态（未衬砌）。 SUBTYPE：本排水几何网络中的多数要素类包含多个子类型，对应关系为：1=改良型，2=未改良型，3=沟渠（Ditch），4=洼地排水渠（Swale）。 UPDATED_BY：最后更新该GIS要素的人员。 WIDTH：渠道宽度，单位为英尺。 本雨水排水数据集仍处于完善阶段，强烈建议所有数据使用者获取最新版本，最新数据可在洛杉矶县电子GIS枢纽（LA County eGIS Hub）网站下载。 使用条款： 本数据源自本县地籍土地基础数据库，要素通常根据备案的「竣工实测」图纸添加至本数据集。实地设施的精准位置需由具备资质的野外作业人员确定。若发现任何错误或有一般性疑问，请联系贡献者列表中列出的人员。本产品仅用于信息参考，不得用于法律、工程或测量用途。本县不对任何错误或遗漏承担责任。