入流和入渗(inflow and infiltration)会导致管道中水量超过设计水量,是导致污水管道溢流的主要原因。由于管道埋藏于地下,入流和入渗时间和位置随机性强,难于及时发现入流和入渗的位置和原因。目前国外的排水研究和管理人员利用在线监...入流和入渗(inflow and infiltration)会导致管道中水量超过设计水量,是导致污水管道溢流的主要原因。由于管道埋藏于地下,入流和入渗时间和位置随机性强,难于及时发现入流和入渗的位置和原因。目前国外的排水研究和管理人员利用在线监测技术获取了大量的监测数据,分析水量变化规律,并利用烟道测试等检测手段寻找入流入渗源。对排水管道入流入渗的监测和数据分析技术及在实际管理中的应用手段进行了综述,并以国内某城市实际监测数据为例进行入流入渗的分析,可为国内排水管网监控管理提供借鉴。展开更多
This paper was undertaken to compare eleven utilities where part or all of the utility was tested for infiltration and inflow with the intention of determining the value of data gathered from midnight investigations, ...This paper was undertaken to compare eleven utilities where part or all of the utility was tested for infiltration and inflow with the intention of determining the value of data gathered from midnight investigations, comparing</span><span style="font-family:""> </span><span style="font-family:Verdana;">potential costs (in 2020 dollars)</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and understanding whether statistical methods can be used to predict potential problems on the system. Inflow and infiltration amounts can be identified on a utility system without significant effort. Inflow correction is robust</span><span style="font-family:""> </span><span style="font-family:Verdana;">and easy to implement (though often overlooked). After inflow is addressed, the results indicated that a midnight investigation could quickly identify portions of the sewer system in need of attention. Maps of leaky pipe sections can be identified, and commonalities in the system may become apparent. Statistical methods were used to identify high groundwater levels and lateral issues as critical issues on these systems. The methods can be utilized at other utilities to help guide them to addressing the critical issues first as opposed to focusing only on the traditional pipe lining solutions that often ignore the lateral and inflow issues that plague utility managers.展开更多
Separate sanitary sewer systems are designed to convey sewage waste from municipal areas to a central treatment facility;they are not designed to handle water associated with precipitation events. However, intercept o...Separate sanitary sewer systems are designed to convey sewage waste from municipal areas to a central treatment facility;they are not designed to handle water associated with precipitation events. However, intercept of groundwater (infiltration) and of flows through manholes or unauthorized connections (inflows) introduces rainwater into the sanitary sewer system. Infiltration/Inflow (I/I) increases the costs associated with treatment and can create additional environmental problems. Identifying and quantifying the volume I/I can be complicated and costly. A simple quantitative method was developed to quantify the extent of I/I occurring in sewer sheds. The method uses measured sewer flows, water usage, precipitation values, and land cover data to calculate the volume of extraneous flows. To assess its utility, the method was used to compare two urban sewer sheds, Holiday Knolls and Eagle View. Both sewer sheds showed evidence of I/I in excess of 200 gallons per day per inch-mile of sewer pipe (gpd/in-mile). Holiday Knolls, the older subdivision had an average I/I of 1912 gpd/in-mile, while Eagle View had an average of 1143 gpd/in-mile. The devel- oped method provided simple means to calculate I/I and to identify sewer sheds in need of repair.展开更多
文摘入流和入渗(inflow and infiltration)会导致管道中水量超过设计水量,是导致污水管道溢流的主要原因。由于管道埋藏于地下,入流和入渗时间和位置随机性强,难于及时发现入流和入渗的位置和原因。目前国外的排水研究和管理人员利用在线监测技术获取了大量的监测数据,分析水量变化规律,并利用烟道测试等检测手段寻找入流入渗源。对排水管道入流入渗的监测和数据分析技术及在实际管理中的应用手段进行了综述,并以国内某城市实际监测数据为例进行入流入渗的分析,可为国内排水管网监控管理提供借鉴。
文摘This paper was undertaken to compare eleven utilities where part or all of the utility was tested for infiltration and inflow with the intention of determining the value of data gathered from midnight investigations, comparing</span><span style="font-family:""> </span><span style="font-family:Verdana;">potential costs (in 2020 dollars)</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and understanding whether statistical methods can be used to predict potential problems on the system. Inflow and infiltration amounts can be identified on a utility system without significant effort. Inflow correction is robust</span><span style="font-family:""> </span><span style="font-family:Verdana;">and easy to implement (though often overlooked). After inflow is addressed, the results indicated that a midnight investigation could quickly identify portions of the sewer system in need of attention. Maps of leaky pipe sections can be identified, and commonalities in the system may become apparent. Statistical methods were used to identify high groundwater levels and lateral issues as critical issues on these systems. The methods can be utilized at other utilities to help guide them to addressing the critical issues first as opposed to focusing only on the traditional pipe lining solutions that often ignore the lateral and inflow issues that plague utility managers.
文摘Separate sanitary sewer systems are designed to convey sewage waste from municipal areas to a central treatment facility;they are not designed to handle water associated with precipitation events. However, intercept of groundwater (infiltration) and of flows through manholes or unauthorized connections (inflows) introduces rainwater into the sanitary sewer system. Infiltration/Inflow (I/I) increases the costs associated with treatment and can create additional environmental problems. Identifying and quantifying the volume I/I can be complicated and costly. A simple quantitative method was developed to quantify the extent of I/I occurring in sewer sheds. The method uses measured sewer flows, water usage, precipitation values, and land cover data to calculate the volume of extraneous flows. To assess its utility, the method was used to compare two urban sewer sheds, Holiday Knolls and Eagle View. Both sewer sheds showed evidence of I/I in excess of 200 gallons per day per inch-mile of sewer pipe (gpd/in-mile). Holiday Knolls, the older subdivision had an average I/I of 1912 gpd/in-mile, while Eagle View had an average of 1143 gpd/in-mile. The devel- oped method provided simple means to calculate I/I and to identify sewer sheds in need of repair.
