The City of Miami Beach, Florida, is a volume sewer customer (VSC) of Miami-Dade Water and Sewer Department (MDWASD). As such, the City must comply with the requirements set forth in Miami-Dade County's Volume Sewer Customer Ordinance (VSCO) 96-166. In order to satisfy one component of the VSCO, the City completed the Sanitary Sewer Evaluation Survey (SSES). The SSES project is comprised of several phases, including Phase I: System Flow Monitoring, Phase II: Sanitary Sewer Evaluations, and Phase III: Rehabilitation. The system flow monitoring plan and report presented the flows for all of the City's sewer basins. The results of Phases I and II identified seven basins that exceeded the County-mandated maximum allowable infiltration criterion of 5,000 gallons per day per inch diameter mile (gpd/idm). The purpose of this paper is to present the existing conditions of the City's sanitary sewer system; discuss the identification of potential sources of infiltration and inflow (I/I); and outline the prioritization strategy for immediate repairs, rehabilitation, replacement, inspection, and maintenance to reduce I/I. This paper presents an overview of the common causes of sewer system problems; how instances of these common problems were identified during the study; and how the technological tools used, combined with the data collected, have yielded the City an easy to apply, prioritized action plan for evaluating and rehabilitating their sanitary sewers to renovate severe structural defects and reduce the wet-weather flows beneath the 5,000 gpd/idm for all basins. The City is currently in the midst of the sewer rehabilitation construction contract and CDM will continue to assist with overseeing the rehabilitation and document the I/I reductions as the rehabilitation is completed in each basin.
展开▼
