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Trunk Fee Calculation <br />The trunk fee charged to developers is based on the estimated City-wide cost of constructing n«w <br />ponds and pipes to serve anticipated new development. The basic fee has been calculated with the <br />expectation that the majority of new development in the City will be of the 2-acre single family <br />variety and was calculated as follows: <br />Cost of anticipated stormwater improvements needed to <br />seive anticipated new development in the next the years <br />Number of acres expected to be <br />developed in the next five years <br />= S2,670 Cost-per-Acre <br />Higher-density development creates more stormwater runoff per-acre needing treatment, than lower <br />density development. This difference is quantified by assigning an "Equivalent Factor" to each <br />density of development. Higher density has a higher Equivalent Factor based on standardized <br />"runoff coefficients". The 2-acre lot is considered the standard for Orouo, so its Equivalent Factor <br />is 1 . A 1/2 acre lot has an Equivalent Factor of 1.48, while a .^-acre lot has an Equivalent Facior of <br />0.8 (see Table 1). The $2,760 Cost-per-Acre is multiplied by the Equivalent Factor to get the <br />Adjusted Cost-per-Acre for each different land >ise. The Adjusted Cost-per-Acre is multiplied by <br />the standard lot sizes to get the Adjusted Cost-per-Development Unit (or 'per-lot') <br />Table 1. Adjusted Cost-per-Acre Based on Land Use Designation <br />Land Use <br />Equivalent Factor <br />(based on runoff <br />coeffkients) <br />Adjusted Cost-per- <br />Acre <br />($) <br />Adjusted Cost-per- <br />Development Unit <br />($) <br />5 acre SFR 0.8 2,140 10,700 <br />2 acre SFR 10 2,670 5,340 <br />1 acre SFR 1.32 3,525 3,525 <br />1/2 acre SFR 1.48 3,950 1,«75 <br />3 units per acre MF 1.8 4.800 1.600 <br />Commercial industrial 24 6.410 6,410 y ^ of acres <br />;i)The Adjusted Cost-per-Acre will be used to calculate the stormwater trunk fee <br />This column is shown for illustrative purposes It assumes standard lot sizes will vary according <br />to actual development density. <br />As Table 1 shows, although the Cost-per-Acre is lower for lower density development, the cost-per- <br />lot or per-unit is higher for lower density development. The small per-lot fee for 1/2 acre <br />development as compared to the large per-lot fee for 5-acre development may seem somewhat <br />inconsistent, because we perceive that the 5 acre lot has a much smaller impact on the environment