Stormwater Control Other Line

For more information about this layer please see the GIS Data Catalog. Control Other Line Component Type---Infiltration Trench: 2-5’ wide trench designed to infiltrate stormwater below the ground surface. They feature perforated distribution pipes that is topped with filter fabric to prevent dispersal to the ground surface.---Bioretention Swale: May have rocks in the swale, various plantings with a landscaped feature look. ---Dispersal Trench: 2.5’ or greater trench designed to disperse stormwater to the ground surface. They feature perforated distribution pipes and a filter fabric trench liner to prevent infiltration. ---Basic Dispersion: Basic dispersion is the application of dispersion devices that utilize any available capacity of onsite vegetated areas to mitigate the runoff quantity and quality impacts from developed surfaces (i.e., impervious and non-native pervious surfaces). The requirements for basic dispersion are less restrictive than full dispersion in that any type of vegetation cover is allowed, the flowpath lengths through the vegetation are shorter, and there is no requirement to preserve native vegetated surface (e.g., forested surface) or minimize developed surface. As such, its mitigation of runoff impacts is significantly lower than that of full dispersion.---Full Dispersion: Features a native vegetated flowpath segment of at least 100ft (25ft for sheet flow from a non-native pervious surface) along the flowpath that runoff would follow upon discharge. The flowpath segment must be either onsite or in an offsite tract or easement area reserved for dispersion and should be designated as a “native growth retention area” on the flow control BMP site plan attached to the required declaration of covenant and grant of easement. Full dispersion involves use of splash blocks, rock pads, gravel filled trenches or sheet flow.如需了解该图层的更多信息，请查阅地理信息系统（GIS）数据目录。 其他控制管线组件类型说明如下： ——渗滤沟（Infiltration Trench）：宽度为2至5英尺的沟槽，设计用于将暴雨雨水渗入地下。其配有穿孔配水管，上方铺设过滤织物以防止泥水扩散至地表。 ——生物滞留沟（Bioretention Swale）：沟内可设置石块，搭配各类植被，兼具景观美化效果。 ——分散沟槽（Dispersal Trench）：宽度不小于2.5英尺的沟槽，设计用于将暴雨雨水分散至地表。其配有穿孔配水管与过滤织物沟槽衬里，以阻止雨水下渗。 ——基础分散（Basic Dispersion）：指通过分散装置，利用场地内现有植被区域的容纳能力，缓解开发用地（即不透水表面与外来透水表面）产生的径流量与水质影响。基础分散的要求相较于全部分散更为宽松：允许使用任意类型的植被覆盖，径流在植被中的流经路径更短，且无需保留原生植被表面（如林地表面）或减少开发用地占比。因此其对径流影响的缓解效果远低于全部分散方案。 ——全部分散（Full Dispersion）：要求径流排放后流经的路径中，包含至少100英尺的原生植被流径（外来透水表面产生的片状流则为25英尺）。该流径段需位于场地内，或位于用于分散功能的场外地块或地役权区域，并需在随附于必备契约声明与地役权授予书的径流控制最佳管理措施（BMP）场地平面图中被标注为"原生植被保留区"。全部分散方案需采用消能块、石垫、填砾石沟槽或片状流形式。