Draft Infiltration and Inflow Report March 1998

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highest watershed divides. In the City of Paris specifically, 80% of the terrain is nearly level to strongly sloping, while the remaining 20% is nearly level to gently sloping. The area is dissected by many well-defined drainage ways. The area to the north of Paris drains northeast into the Red River. To the south of Paris, the water drains southeast into North Sulphur River. Approximately 42 percent of the area is used for pasture and hay, 33 percent for crops, 13 percent for woodlands, 4 percent for range, and 8 percent for urban land, federal military land and water area. F. Geology In the City of Paris, approximately 80% of the soils and sub-soils consist of Annona, Freestone and Woodtell types. The remaining 20% is predominantly made up of Wilson, Normangee and Crockett soil types. Soil permeability ranges from slowly permeable to very slowly permeable. These properties generally reduce the effects of long-term infiltration, but at the same time these soil types have a tendency to magnify inflow intensity. G. PopulaNon The population of Paris, according to the 1990 U. S. census, was 24,699 persons. In the same yeaz, the population of Lamar County was recorded at 43,949 persons. H. Present Conditions The Flow Monitoring Study conducted by ADS in October 1996 determined that the infrastructure decay of the City of Paris resulted in excessive inflow and infiltration, deficient wet weather and dry weather capacities, as well as overflows, in more that half of the basins monitored. Rainfall resulted in surchazge and backwater conditions at ten monitoring sites. The current sanitary collection system is composed of both gravity and force mainline collection pipes. The materials utilized for the construction of the force mains include PVC and cast iron pipe. Gravity mains in the collection system are constructed of vitrified clay, PVC ADS Environmental Services, Inc. II-3