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,� <br />9D <br />} <br />U BO <br />Z <br />lti <br />U <br />� �o <br />U. <br />� <br />6� <br />� <br />� <br />a ;o <br />� <br />w <br />a <br />.o <br />� <br />� <br />�'+ :o <br />s <br />a <br />yxo <br />io <br />0 <br />0-001 q.002 0.005 0.01 0.02 O.OS 0.1 0.2 D.S i.0 t.Q S.Q iU <br />f. Read sediment removal efficiency from following graph: <br />BRUNE' S TRAP EFFICIENCY CURVE <br />g. Credit =% sediment removal efficiency/2 x storm drainage fee. <br />(4) Credits for Storm Water Detention: <br />A parcel may be credited for up to 25% of the storm water drainage fee for onsite measures which <br />limit storm water outflow rates from the site in accordance with the following procedure: <br />a. 10% credit for parcels which limit peak outflow rates during a 5-year rainfall event to <br />predevelopment rates. <br />b. Additional 15% credit for parcels which limit peak outflow rates during a 100-year rainfall <br />event to predevelopment rates. (Based on the rational method of runoff analysis. <br />Predevelopment condition shall be considered to have a rational "C" value of 02. Time of <br />concentration shall be no shorter than 30 minutes). <br />c. No detention credits will be given for parcels which do not limit 5-year event outflow rates to <br />predevelopment levels. <br />(5) Credits Shown in (3) and (4) Above Mav be Cumulative. <br />(6) Periodic Inspection and Credit Adjustments. <br />Public Warks Director reserves the right to inspect periodically all storm drainage control facilities <br />to ascertain that they are operating properly. If such a system, due to improper maintenance or <br />other reason, fails to detain or cleanse storm water runoff in an effective manner, the director may <br />eliminate or reduce water quality or detention credits to an appropriate level. Any such facility <br />shall not be eligible to apply for storm drainage fee adjustments for a period of 12 months <br />following any credit adjustment. Credit adjustments shall not be made retroactively. <br />5 <br />