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Chapter 2.0 <br />SELECTING, DESIGNING, CONSTRUCTING AND LANDSCAPING <br />STURMWATER MANAGEMENT FACILITIES <br />This chapter provides procedures for selecting and designing stormwater facilities that <br />provide stormwater flood control, quality, and flow control. It includes. <br />2.1 INTRODUCTION _ .... _._ ........... ___..._..._...._...... ........... ...... ....... .._ ...... .... ... .................... _......3 <br />2.2 STORMWATER. FACILITIES..._... ;..................._,..... _,.._...................._..._. <br />... ..,... ................. _..._ 3 <br />2.2.1 - <br />Impervious Area Reduction Techniques ................ _.._._ ... . .......... _ ........ _.._...._ 3 <br />2.2.2 <br />Infiltration Treatment Facilities .__...._ ----------- ........._.,.: <br />........... ......_........... _. .... _ 3 <br />- 123 <br />Filtration Treatment Facilities...:..._ ................. ... ......... _.. .......... .r..._..___....._ 3 <br />2.2.4 <br />Mechanical Treatment Devices ... _ .... _ ................... ._ <br />. ...... _.._ ........... _.._.._._ 3 <br />2.2.5 <br />liadlity Underdrains and Surface Overflows ......... <br />_ ...... �.._.........._.– .......,.4 <br />2 .2.6 <br />Source Control Devices ... __ .... _.. ... _ .... _ . ..... . ... .. ...... ....–.. <br />...... .............................. 4 <br />2.3 _FACILITY DESIGN CRITERA .......... _ .... r.._.._._...._...._........._ .. ....... <br />....._ ...... ..... ... ... ............ ._...._ 5 <br />2.3.1 <br />Public Stormwater Facilities _._...._...._ ........ _ ........... ._ ..... . ......... _ ... . .......... ... ... 7 <br />2.3.2 <br />Private Stormwater Facilities __._ ............. 7 <br />2.33 <br />Contained Planter .._ .... .r.. ...._ ...... .._.__, .. . ........ ....... 9 <br />23.4 <br />Eco-Roof ....... ...... t . ..... . ....... . ...... :..........._.................. ...... ...... <br />..... ........ _.....— ..r..._.11 <br />Stvrmwater Management Manual 2 -1 - <br />Eugene 2014 <br />2.3.5 <br />Permeable Pavements .._._._..._..._......_........... ._.....___....... .......�.r_..._ <br />15 <br />2 .3.6 <br />Trees ..... _.._ . ...... : ............. _..._...._. .._......_ . ..__ ...... ...... ....... .........._.....,.....17 <br />2.3.7 <br />Filter Strip ........... ...... ....... _... ......... ._...._.............19 <br />23.8 <br />Ponds .... _ ......... ....... ............. W._..... .W...,._.... ............. ..... _............. ......................_......21 <br />2.3.8.1 <br />Wet Ponds_ ....................... _ .... _.__..._.._ ... _ ............ __................... <br />21 <br />2.3.8.2 <br />Extended Wet Ponds .... _.. r. ... _..__._._.._._ ...... _.. ......... _ ........... _....__:._..... 21 <br />2.18.3 <br />Dry Detention Ponds .: ... _.._ .... _.....__.._..__ ............... W ...:.:......_......_.....W..... <br />21 <br />2.3.9 - <br />Rain Garden–.............................................................._................ ................_.............. 25 <br />2 .3.10 <br />Sand Filter_ . ...................... .. .......... .. ....... .. ... ._..... ........ ....... ......... ... ............ ................... 29 <br />2.3.1 -1 <br />Stormwater Planter .... ................... ... ......__....._ ....._............ _ ... ......... <br />._...... 31 <br />.m...,.......... <br />2.3.12 <br />Swale ... ...... ........... ................ .. .......... .. ........... ... ... ..... ....... .... ... . ........ . .. ....... .. .... <br />35 <br />23.13 <br />Proprietary Treatment Devices .......... _.._ .......... _ ... .... __ ....... _ ..................... 39 <br />2.3.14 <br />Spill Control Manhole ...... .. ............. . ............. _ ........................ _.............................. 41 <br />2.3.15 <br />Structural Detention Facility .... . .......... _..._.. ....... ....... _. ._.................._..._...... <br />43 <br />2 .3:16 <br />Drywell ......... ...._ .................................................. ...... ......... ... ........ ._. ........... .... ....... ........ 45 <br />2 .3.17 <br />Soakage Trench ............................... . ............. .._.................... ..._ .. ............. <br />_......... 47 <br />2A <br />FACILITY SIZING APPROACHES ............................... ._...._._ ........ . ....... ... .............. ..... ..... ........ 49 <br />2.4.1 <br />Simplified Approach (SIM Form 2013) _._ ..... .... ....... _.r . ................... ..�.. 4r9 <br />2 .4.2 <br />Presumptive Approach................................._._.................. .._................_......._... 5o <br />2.5 <br />HYDROLOGIC ANALYSIS _ ................................................. .....:...... ... ...... ....... .... ...... – ...... _ ..... ..._... 52 <br />2.6 <br />ACCESS FOR OPERATIONS AND MAINTENANCE ............................. .............– .............._ 54 <br />2.7 <br />OUTFALL DESIGN _ ........... ..... .... .... _mm .............. . ............ ......._....._......_._ ........ _ ............. <br />_.......... . 55 <br />2.8 <br />CONSTRUCTION CRITERIA _ .............................. ...._...___._......_ .......................... _ ........ ...... 56 <br />Stvrmwater Management Manual 2 -1 - <br />Eugene 2014 <br />