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12 <br />d) Calculate or verify pond volume in acre-feet below outlet elevation. <br />e) Calculate, capacity-inflow ration (CIR) <br />CIR-pond volume/Vannuai <br />� Read sediment removal efficiency from Brune's Trap Efficiency Curve (See <br />policy). <br />g) Calculate total site efficiency by proportioning the efficiency of each area, and <br />adding together. <br />h) Calculate credit: <br />Credit= site efficiency/2 x REU value x current rate. <br />4. Exceptions and special cases. <br />a) Off-site water drains to treatment area--Ignore effects of off-site water in <br />calculating pond efficiency. <br />b) Parcel shares ponding facility. If parcel has water normally ponded on site, <br />calculate volume of pond on that site below outfall. Then calculate credit per <br />normal procedure. <br />D. OTHER CREDITS <br />Where, in the opinion of the staff, the above procedures do not result in an appropriate <br />storm drainage charge, the Public Warks Director has the authority to make adjustments <br />consistent with the intent of the storm drainage utility. <br />AUTHORITY <br />• Drainage, Chapter 74, Storm Water Drainage Utility, adopted January, 1984. <br />• City Policy, Credits and/or adjustments to munici�al storm water draina_ e� fees, adopted January, <br />1984. <br />� <br />