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<br /> 100 <br /> '0 <br />>- <br />U 80 <br />Z <br />UJ <br />~ 70 <br />u.. <br />u.. <br />ILl <br /> 60 <br />...J <br />~ <br />0 ~O <br />::E <br />UJ <br />a: <br /> 40 <br />I- <br />Z <br />ILl 30 <br />::E <br />0 <br />ILl 20 <br />(/) <br /> 10 <br /> 0 <br /> 0.001 0.002 0.005 0.01 0.02 <br /> <br /> <br /> <br />-4- <br /> <br />(f) I€ad sedi.Irent renoval efficiency fran followinq graph: <br /> <br />CAPACITY INFLOW RATIO I acre-ft/acre-ft/yr <br /> <br /> <br />0.05 <br /> <br />0.2 <br /> <br />0.5 <br /> <br />2.0 <br /> <br />5.0 <br /> <br />10 <br /> <br />1.0 <br /> <br />0.1 <br /> <br />BRUNE'S TRAP EFFICIENCY CURVE <br />(g) Credit = % sediment rerroval efficiency / 2 stonn drainage fee. <br /> <br />IV. Credits for Storm Water Detention: <br /> <br />A parcel may be credited for up to <br />drainage fee for onsite measures which <br />flow rates from the site in accordance <br />procedure: <br /> <br />(a) 10% credit for parcels which limit peak outflow rates <br />during a 5-year rainfall event to predevelopment rates. <br /> <br />(b) Additional 15% credit for parcels which limit peak <br />outflow rates during a 100-year rainfall event to pre- <br />development rates. <br />(Based on the rational method of runoff analysis. Pre- <br />development condition shall be considered to have a <br />rational "C" value of 0.2. Time of concentration <br />shall be no shorter than 30 min.) <br /> <br />No detention credits will be given for parcels which <br />do not limit 5-year event outflow rates to predevelop- <br />ment levels. <br /> <br />25% of the storm water <br />limit storm water out- <br />with the following <br /> <br />(c) <br /> <br />V. Credits Shown in (3) and (4) Above May Be C~~ulative. <br /> <br />IV. Periodic Inspection and Credit Adjustments. <br /> <br />Public Works Director reserves the right to inspect periodi- <br />cally all storm drainage control facilities to ascertain that <br />they are operating properly. If such a system, due to improper <br />maintenance or other reason, fails to detain or cleanse storm <br />water runoff in an effective manner, the director may eliminate <br />