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2020 Eugene Wastewater Master Plan Chapter 4: Design Criteria 28 Chapter 4 - Design Criteria PURPOSE The main purpose of this chapter is to standardize wastewater collection system design criteria for new development in the city of Eugene. These criteria utilize the best available land use and planning information and standardizes the calculation of design flows within the collection system. The specific types of information needed to estimate collection system design flows are: • Land use designations – Land use designations for the development under consideration, and all upstream contributing areas through the development. • Base wastewater flow – Estimated daily average base wastewater flow rates for residential, commercial, and industrial users. • Peak flow factor – A factor applied to the average base wastewater flow to estimate peak flow rates that occur during the day. • Peak infiltration/inflow – The estimated peak flow rate for stormwater that enters the collection system through wastewater defects and unauthorized connections. LAND USE INFORMATION Land use designations and population projections are the basis for estimating base wastewater flows in the collection system. Specific information about existing and projected land-use designations, can be obtained from the City of Eugene Planning and Development Department. For purposes of long-range, general planning, Table 4-1 includes the land-use designations that are assumed to contribute wastewater flows to the system. Also included is a very brief description of allowed uses within each designation. Table 4-1: Land-Use Designation Categories Assumed to Contribute Flow to the Wastewater System Land Use Designation Brief Description Low-Density Residential One-family dwellings with some allowance for other types of dwellings. Up to 14 dwellings per net acre. Medium-Density Residential Medium-density residential use and encourage a variety of dwelling types. Allowed density between 10-28 dwellings per net acre High-Density Residential High-density residential use and is intended to provide an opportunity for a dense living environment. Allowed density 20-112 dwellings per net acre Neighborhood Commercial Facilities Generally, less than 5 acres, serving day to day needs. Community Commercial Centers Generally, 5 acres to 40 acres, include a wide range of purchaser goods and entertainment, office, and service needs for a support population smaller than that of the metropolitan area but larger than that of a neighborhood.