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IV. Items Considered by Orono as Hardcover <br />« "»• "«essarily all- <br />Structural <br />Buildings <br />Tennis courts <br />Pools, incl. water surface <br />Decks, regardless of spacing <br />Roofs of any sort, including <br />some roof overhangs... <br />Play structures <br />Temporary buildings <br />Non-Structiin^l <br />Roads and shoulders <br />Driveways (Concrete, asphalt, gravel, dirt) <br />Sidewalks, ramps, etc. <br />Any surface intended to be driven on <br />Landscape beds lined with plastic sheeting <br />Landscape beds lined with permeable weed- <br />prevention fabric <br />Tops of rock or timber retaining walls <br />Patios, stepping stones <br />Porous pavements (various) <br />B. Basis for Including or Excluding Specific Items: <br />Slatted Decks. It can be readily demonstrated by calculation that even <br />minimal spacmg of 1/8 to 1/4 inch between decking boards will allow <br />total transmittal of the 100-year storm, the drip lines taking on a <br />chara^nstic parallel pattern below the deck. However, swelHng of <br />deck ^ards may close the spaces; cupping of deck boards coupled <br />wi s oping them lengthwise in one direction may cause runoff- the <br />hoi^owner may place fabric or plastic under the deck to inhibit weed <br />growth or direct runoff away from the house; and all of these <br />occurrences are not under the control of the City, and can lead to a deck <br />hardcover. Therefore, the City Council in the <br />mid-1980s concluded that decks will be considered i hardcover <br />Sled for fhf <br />dKorative landscape beds containing rock, bark, mulch, etc. Although, oarK, muicn, etc. Althoueh <br />some types of plastic sheeting tend to degrade in sunlight and may in <br />fact ^come permeable’ after a few years, such material is considered <br />to interfere with the direct absorhfmn nf ____ ...0 interf^ with the direct absorbtion of runoff into the gmu^Sras <br />efficiently as other more obvious forms of hardcover. <br />8