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and shall not be included in the computation of minimum open space); 2) open space shall include areas with physical characteristics unsuitable for development in their natural state. and areas contaínina sianificant historic sites or unnlatted cemeterie!¡' . ~ ...---- --~_._..""" g-- , -.... ..----. -~-------------.......-----, 3) open space may include outdoor recreational facilities for use by owners of dwelling units or sites, by guests staying in commerical dwelling units or sites, and by the general public; 4) open space shall not include commercial facilities or uses, but may contain water-oriented accessory structures or facilities; C\ ."'.a ft.........a.II.I'I.......4 I"'t.~""......ão... ...._fto.....ð ""...___ :_....1.......1:__ ..__^_A_1...... ..1I___+...."':n._ ..._..1 ...11.-.......""'.....1..0"lIl'11...._.... ~ J ...... ~yr'...g.¡ "........ v.. vy...u .-:tyø\l\,; g.¡ çc¡O), UI\l'UUIU!5 ~vYI;!!)l øyuJ' , ..ç!5ç~ø~Jv,t, tLUU tLlJVW"VJ'" U¡)I;';), shall be preserved by use ofrestrlctive deed covenants, permanent easements, public dedication and acceptance, or other equally effective and pennanent means; and 6) the shore impact zone, based on normal structure setbacks, shal1 be included as open space. For residential POO's, at least so percent of the shore impact zone area of existing developments or at least 70 percent of the shore impact zone area of new developments shaH be preserved in its natural or existing state. For commercial POD's, at least 50 percent of the shore impact zone shaH be preserved in its natural state. 18.085.75 Erosion Control and Stormwater Management. Erosion control and stonnwater management plans must be developed and the PUD shall be: 1) designed, and the construction managed, to minim,ize the likelihood of serious erosion occurring "either during or after construction. This shall be accomplished by limiting the amount and length of time of bare ground exposure. Temporary ground covers, sediment entrapment facilities, vegetated buffer strips, or other appropriate techniques shall be used to minimize ero~ion impacts on surface water features; and . 2) designed and constructed to effectively manage re~sonably expected quantities and qualities of stonnwater runoff Impervious surfac~ coverage within any tier must not exceed 25 percent of the tier area, except that for commercial PUD's 35 percent impervious surface coverage may be allowed in the first tier of general development lakes with an RnnrOVp.n ~tormWßter mRnRaement nIan and con~i!iltencv with ~ection 1 R .._--..........-- -rr-.... -...- ......--......-........-- --.-,......~-----..... r---- --"'..... -------.----,.1 ....-.- ---.---- --, 18.085.76 CentraHzation and Design qfFacilities. Centralization and design of facilities and structures shall be done according to the I following standards: 1) planned unit developments shall be connected to publicly owned water supply and sewer systems; ......, ~____''~__ _ ____~.L~ ~_ ~~....__ _"---_Ii L_ _1___...___..:1 :~...__ ___.... ....__ _....__ ___.~__ _.......... .._ __.1._-1 _~_ ___.!..._L-'~ ¿.j oweumg UIULS or suc:s :smuI UI:: "'I~:SLI;II;U IIILU vue: U~ mUle: ~LUUp:S WIU IUC/:iLe:U un ~UJLé1Ule areas of the development. They shall be designed ~d located to meet or exceed the following dimensional standards for the relevant sboreland classification: setback from the ordinary high water level, elevation above the surface water features, and maximum height Setbacks ftom the ordinary high water level shall be increased in a.ccordance with Section 18.040 of this ordinance for developments with density increases; 22