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,� . <br />,_, '-t(/LC m�� x�� ,'Y�� m r r o[ e5 5 <br />J51. 81 I.� �, �, I z� b l e�{.�w+ -f in.,c <br />w�Znu I� xlurer. <br />�{- 1�.J ir,�c. i S <br />�J;7vIF" <br />✓ Highflow bypass p'�ng is req»ired for the vault per City <br />st;3ndards. The ault design �low should be reached at the <br />� J��,,��"'s point that th water elevation reaches the invert of the <br />�i'"�i�' Fi� , Ns �ighflow hyp s pipe. The flo through the separator should <br />S�Z�a�y� �e�o��f�not exceed t e-maximufi-process�kthe largest f�ow the <br />iy,,,,,m ma�, separator can andle-before�ccumulated oil begins to be <br />��µ„ �"W `� }-flushed out) when the head needed to pass the 25 year storm <br />f`� aH�a � j�� s reached in the highflow bypass pipe. <br />r�� Yx,-n�`' g �rea is used in calculatin the size <br />��' •�n'The entire contributin <br />v�,,,i f s of t!ie oil/water separator vault although only thegpaved <br />��,5��"N� surface is required to be routed through the separator. <br />The following information is required for City review and <br />� approval of oil/water separators: <br />1) design flow calculations <br />2) design inlet capacity calculations <br />3) orifice sizing calculations <br />4) oil/water separator sizing calculations <br />5) bypass sizing calculations <br />6) copy of site plan showing the contributing area <br />Vecetated swales• <br />c���,yf The City classifies vegetated swales as either grass swales <br />��� �L or emergent swales, based on the longitudinal slope of the <br />n�,� L fifNlswale. The slope of the swale on site classifies it as an <br />�,/5"��� standardsstolunderstandptheaspecificddesign andtconstruction <br />��n�s�° �-,�r �rriteria for this type of swale. All notes and callouts to <br />h o(-,��"�_mr;q��''�the swale area should refer to the swale es an emergent <br />s ���� vegetated swale, <br />i,�� e. <br />5"`� �G��l Ciirrent City standards call for vegetated swales to be <br />�Ic•i designed to provide a minimum 5 minute r�sidence time for <br />����� ��ti the s:aale design flow. The minimum flow to be used is the <br />���t�'�.;��� • peak cischarge from the 2 year, 24-hour storm. ev ,� <br />r��'" � s��Qritlix.ions need to be used in determininq the <br />.desian f]ow. _s ale <br />����r�� y"�� swalesdesigndflowqberb that flows greater than the vegetatefl <br />ypassed ar.ound the swale. Bypass <br />C�' ,.���I�` sizing calculations need t� be submitted, showing that the <br />�C- {���,. flow to the swale has been restricted to the design flow. <br />�t�v <br />� The maximu�r allowable velocity in vegetated swales is 0.9 <br />feet per second. <br />✓ The Manning's equations, with an "n" value of 0.20� is to be <br />used to calculate the average flow velocity in the veqetated <br />swale. <br />� Vegetated swales are to be designe3 with a trapezoidal cross <br />section, with a bottom widLh between one and eight feet. <br />