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/l� i ' C. �� .. 'i� .4 `,�.� ��• - � � 'Iii � i" ri.� CC�. . <br /> , . _i�?�i " . . . <br /> • J r,,ti� �- , <br /> , ,� � �� <br /> c.�/,_: � � �f— ; <br /> .: <br /> O KEl[ OR7INDII ![ � <br /> J./ <br /> __ .... .............. .,_-- p� ► / 1`7-7-f' <br /> C1i ;'_r�` EVERETT /I� I (��Iv �/� <br /> ��1r r�nr,i� Ccunter Gordon Witcher / -, i n <br /> FROK: Jane Zimmerman ��%�/ (� ��J� <br /> DATS: June 2, 1994 ��/ <br /> ��-- <br /> 80BJECT: Plan Review, SEPA ,�94-18, Intrawest <br /> — �� �'` i :,._. � ;,; 1�/�/'i/r� : <br /> CALCIILATIONB j/iiG��i�/ //•`:l 1`� i %:%'� L �/�f i�;/: ; <br /> !'• �i�, �i ,'�/ //J CG�'i� ,/l��', � � <br /> Qeneral• �7��,��:..�,_. .� ,. , � % ;'/'J/��,lY�i� <br /> . � The combined relea�e �from the wetlands and the wetpohd must -;;.-�� <br /> meet City of Everett detention criteria. <br /> {,� �'S �,;r, ,;I���,vi . _ - � <br /> � �/ <br /> lfetland Detention: <br /> Z` �� The stage-storage relationship of the wetland ponds are <br /> �`� , required to show that the ponds ha��e the capacity to store <br /> ,, .•` 1 �`'r � the required detention volume. r- ;,�' <br /> � ,,�^ j <br /> � ' Calculations for the log weir control structure(s) must be " <br /> submitted. <br /> R�toond/D�t�ntion: <br /> The staqe-storage relationship of the pond ie required to <br /> show that the pond has the capacity to store the required <br /> wetpond permanent storage volume and any live detention <br /> volume. �!' _' <br /> The wetpond design volume is determined separately from <br /> detention volume. The wetpond design volume is equal to the <br /> volume of runoff from the design storm (the 6 month, 24-hour <br /> storm) . The followinq two methods are acceptable for <br /> determining the wet pond design volume; either 1) multiply <br /> the area of impervious surface in the contributing basin by <br /> the precipitation associated with the design storm or 2) <br /> determine L•he total volume of stormwater runoff from the <br /> design storm using the Santa Barbara Urban Hydrograph method <br /> or comparable method. 1,- <br />