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2.3.3 Contained Planter Fadlity Desolation Contained Planters are free- standing plant containers placed over impervious surfaces such as patios, sidewalks, and rooftops that intercept and filter rainfall that would otherwise contribute to stormwater runoff from the underlying impervious surface. Contained planters may be prefabricated pots of various dimensions or may be constructed in place and have an infinite variety of shapes and sizes. Contained Planters intercept precipitation only when sized under the Simplified Approach, not stormwater runoff from other impervious areas. Runoff from other impervious areas is allowed when sized under the Presumptive Approach. Drainage is allowed through the bottom of the planter onto the impervious surface. Contained Planters meet the stormwater management standard for imperious area reduction techniques. Desigtr Requirements Sizing ; Contained Planters replace impervious area at a 1 :1 ratio, Soil Suitability: Contained Planters are appropriate for all soil types, as they are typically placed over impervious surface. The growing medium shall be a minimum 12 inches of topsoil. ,Setbacks: Not applicable. Materials Planter Walls: Planter walls shall be made of stone, concrete, brick, clay, plastic, wood, -or other stable material. Chemically treated wood that can leach out toxic chemicals and contaminate stormwater shall not be used. yegetaim Contained Planters shall be planted to cover at least 50% of the planter surface. Plants shall be relatively self- sustaining, with little need for fertilizers or pesticides. Irrigation is optional, although plant viability must be maintained. Planters tend to dry out more quickly due to reflective heat, Insulation to protect roots may be necessary. Trees are encouraged and may qualify for additional impervious area reductions. 5tormwater Management Manual 2-9 Eugene 2014