In lieu of use of a metering device as specified in section 4.28.150, and upon a determination by the Director of Public Works that it would be unnecessary
or impracticable to install, maintain, or operate such metering device, wastewater
volume discharged by a user into the sewerage facilities may be based upon an estimate
thereof determined by the Director of Public Works. The determination of such estimated
wastewater volume shall be based upon such factors as the number of fixtures through
which wastewater flows into the sewerage facilities from the user's premises, seating
capacity of buildings or improvements upon the premises, the population equivalent
associated with the premises, annual production of goods and services related to the
premises, or other factors reasonably relating to water use, wastewater volume calculations,
and/or diversions of wastewater flow from the sewerage facilities.