One equivalent user shall be defined as contributing 200 gallons per day of wastewater containing not more than 0.45 pounds of 5-day BOD and 0.50 pounds of suspended solids. The equivalent user flow has been developed from population and sewer usage records which indicate an average size dwelling unit has 2.5 people contributing 80 gallons per day per person, standard engineering data indicates 0.18 pounds of 5-day BOD and 0.20 pounds of suspended particles respectively for each person per day. The basic equivalent user shall be subject to revision of population, water usage, sewage volume, and/or other information indicating flow and/or strength significantly different then defined herein. Revision of the basic equivalent user criteria shall normally be made upon the recommendation of a registered professional engineer. (Ord. 1656, 2006).