Final Draft - Wastewater Collection System Capacity Analysis Apprendix A April, 1999

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Final Report City of Paris, Texas Wastewater Collection System Capacity Analysis Ezecutive Summary Background The City of Paris, Texas owns and operates a sanitary sewer collection system far the benefit of its citizens. To assure improved operations of the system, the City retained ADS Environmental Services to perform sanitary sewer flow monitoring, physical inspection, mapping, database construction and hydraulic modeling services for the City. This is part of an improvements program that addresses capacity limitations of the existing collection system. This document presents the problems and potential solutions for these limitations found in the hydraulic modeling of the system. It also briefly describes the modeling techniques that were used to reach those conclusions. Known problems in the collection system have provided the City with the impetus to gain a better understanding of the current state of the system. This information will be used to address the fmancial investments that are required to bring the entire wastewater system into good working order and to maintain it in that condition. This report is organized by first describing briefly in an Executive Summary the fmdings of the modeling efforts and the recommendations. Further technical details are found following this summary. This Technical Report is focused only on the portion of the program that relates to the Alternative Project Development and the Hydraulic Modeling. Other portions of the overall program are the subject of separate reports. Collection System Mapping and Data Base Development As a part of the overall effort to better understand the complexities of the collection system, substantial field investigations were performed. These investigations produced updated field maps which were then used to prepare a digital map of the collection system. Additionally, information related to the size and condition of the pipes was also gathered and entered into databases. These two sources of information were then used to define the overall system layout which was subsequently used as the basis of the collection system model. The system representation was then combined with information collected in the flow monitoring portion of the program to provide a calibrated model which represents the current state of the collection system. These products should also be quite useful in improving maintenance operations for the City. The maps presented in this report are examples of the products now available to the City. 1