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首页> 外文会议>Collection systems conference >Creek Crossing Risk Assessment - A Dual Condition Assessment of Sanitary Infrastructure and Urban Streams for Prioritizing Rehabilitation and Stabilization Projects to Prevent Sewer Failures and SSOs
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Creek Crossing Risk Assessment - A Dual Condition Assessment of Sanitary Infrastructure and Urban Streams for Prioritizing Rehabilitation and Stabilization Projects to Prevent Sewer Failures and SSOs

机译：小溪穿越风险评估-卫生基础设施和城市河流双重状况评估，优先进行修复和稳定项目，以防止下水道故障和SSO

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The City of Richmond has nearly a thousand miles of aging sanitary sewer with many segments located near urban streams. Like many older cities, much of Richmond's larger sewers were laid along stream corridors in order to utilize existing topography to minimize sewer depths and reduce the need for pumping stations. When the sewers were originally installed, they were believed to be located a safe distance away from stream banks (parallel sewers) or below the active stream bed (sewer crossings). However, continued development and urbanization in City watersheds have contributed to the instability of many of the City's streams, which have widened and incised over the years. In some areas the horizontal and vertical changes in stream geometry have resulted in exposing once-buried sewers, increasing the risk of failure and discharge of pollutants to surface waters. Over the past several years, the City has had a handful of sewer failures at creek crossings that have required emergency repairs. These instances have been very costly for the City to address and have further polluted City streams that are already impaired. To protect water quality and address its infrastructure vulnerability along unstable urban stream corridors, the City has recently initiated a city-wide sewer creek crossing assessment program. The purpose of the program is to assess the condition of both the sanitary sewer system and the stream bed and banks in the vicinity of the crossings to determine the risk of failure and identify remedial actions for repairing sewer systems and stabilizing streams. The first phase of this program consisted of a desktop analysis using the City's GIS to identify creek crossing locations and perform field inspections for crossings with a higher risk of failure based upon existing topographic and historical information. The following criteria were used to assign risk values: 1. Primary criteria a. Depth of cover b. Length of sewer pipe in stream c. Percentage of sewer pipe in stream d. Pipe diameter e. Pipe material 2. Secondary criteria a. SSO history b. Service call history 3. Additional criteria a. Proximity to roads/easements b. Parcel type/ownership c. Surface cover Inspections of both sanitary infrastructure and stream stability were performed for all high-risk areas identified in the desktop analysis. Sanitary inspections consisted of topside assessments of shallow manholes and exposed pipe, pole cam video inspection of deep manholes, and pole cam video inspection of roughly 30 feet of upstream and downstream buried sewers. The assessments focused primarily on structural defects, indications of infiltration and inflow, and physical location of sewer infrastructure within/along streams. During the field investigation phase, 186 crossings were evaluated along 29 different streams, 158 manholes were inspected, and 160 sewers were inspected using a pole cam. The field investigation revealed that 20% of the crossings had exposed pipe and 60% of the exposed pipes were observed to have structural defects such as erosion of pipe supports, pipe cracks and fractures. Pole cam inspections revealed that just over half of the buried sewers had some type of structural defect and 55% were observed to have sediment and debris buildup in the pipe. Additionally, just over 50% of the manholes inspected were observed to have structural defects such as concrete spalling, loose/broken frames, and wall damage, and roughly 20% were observed to be impacted by channel erosion.
机译：里士满市有近一千英里的老旧下水道，其中许多路段都位于城市溪流附近。像许多较老的城市一样，里士满的许多较大的下水道都沿着河流走廊铺设，以利用现有的地形来最小化下水道的深度并减少对泵站的需求。最初安装下水道时，据信它们位于距溪岸（平行下水道）较安全的距离或在活动河床下方（下水道交叉口）较安全的位置。但是，纽约市流域的持续发展和城市化加剧了纽约市许多溪流的不稳定性，这些溪流在过去几年中不断扩大和扩大。在某些地区，水流几何形状的水平和垂直变化导致曾经埋没的下水道暴露出来，增加了破坏和将污染物排放到地表水中的风险。在过去的几年中，纽约市在小溪口过道发生了少数下水道故障，需要紧急维修。这些事例对于纽约市解决而言非常昂贵，并进一步污染了已经受损的纽约市溪流。为了保护水质并解决不稳定的城市河流走廊沿线的基础设施脆弱性，纽约市最近启动了一项全市范围的下水道小溪穿越评估计划。该计划的目的是评估卫生污水系统以及过境点附近河床和河床的状况，以确定发生故障的风险，并确定修复污水系统和稳定河流的补救措施。该计划的第一阶段包括使用纽约市GIS进行桌面分析，以识别小溪过境点的位置，并根据现有地形和历史信息对故障风险较高的过境点进行现场检查。以下标准用于分配风险值：1.主要标准盖的深度b。流c中下水道的长度。 d。下水道中污水管的百分比。管道直径e。管道材料2.次要标准SSO历史记录b。服务呼叫历史记录3.其他条件靠近道路/地段b。包裹类型/所有权c。表面覆盖对台式分析中确定的所有高风险区域都进行了卫生基础设施和河流稳定性的检查。卫生检查包括对浅孔和裸露管的顶部评估，对深孔的杆状凸轮视频检查以及对大约30英尺的上游和下游掩埋下水道的杆状凸轮视频检查。评估主要集中在结构缺陷，渗入和流入的迹象以及下水道内/沿水道的下水道基础设施的物理位置。在野外调查阶段，沿着29条不同的河流评估了186个过境点，检查了158个沙井，并使用了极凸轮对了160个下水道进行了检查。现场调查显示，有20％的交叉口有裸露的管道，有60％的裸露的管道存在结构缺陷，例如管道支架腐蚀，管道破裂和断裂。立杆凸轮检查显示，一半以上的下水道有某种结构缺陷，观察到55％的管道中有沉积物和碎屑堆积。此外，观察到的沙井中只有超过50％的人眼有结构缺陷，例如混凝土剥落，框架松动/破损和墙体损坏，并且大约有20％的人孔受到河道侵蚀的影响。

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