11-13-2001 Council Packet - Laserfiche WebLink

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The average lol size in each of ihe zoning districts, '/i. 1.2, & 5 acre districts, was determined by dividing the number of acres in each district by the projected number of homes at full development in each district. The average lot size for the City was calculated by using a weighted average of the percentage of homes in each zoning district at the previously calculated average lot size for that district. Approximately 50% of the homes in Orono arc in the 2-acre district, 45% are in the '/a & 1 acre districts, and 5% in the 5-acre district. The weighted average lot size was determined to be 2 acres The use of an average residential lot size is the only practical method for implementation of a storm water utility and is also equitable. The smaller lots may have less impervious surface, than the larger lots, but the runoff rate is increased because of less pervious lot area to slow the water down and allow for infiltration info the ground. The runoff rate determines the size of the storm water facilities required. The larger lots may have more impervious surface, than the smaller lots, but the runoff rate is decreased because of the larger pervious lot area to slow the wuter down and allow for infiltration into the ground. The overage single family residential lot runoff defines the fee structure’s basic unit, the "Residential Equivalency Factor" (REF). Non-rcsidential parcels will be assigned REF values based on the amount of rtuioff general^ by these parcels versus the amount generated by the typical single family residential lot. This REF will be determined based on the acreage and percentage of impervious surface for each non-rcsidential lot. The following table provides a listing of per acre REF factors based on the percentage of impervious surface for the parcel. The total fee is determined by multiplying the REF factor from the table by the acreage of the parcel. The REF cannot be less than one for billing purposes. JUSiiM