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<br />Rain Gardens
<br />
<br />Urbanization has greaUy ~ncreased the amount of ~mpen,('ct:5 stuOfaces (streets, roofs,
<br />compacted lawns), creating an ovs,rload of storm water runoff. Rainwater that histori-
<br />cally infiltrated i"to the 9ro~md now flushes qtlickly through storm sewers and into
<br />our lakes and streams. These large-volume runoff events transport large amounts of
<br />sediments, excess nutrients and other pol-
<br />lutants, leading to a deterioration of water
<br />quality, along with increased flooding and
<br />erosion problems...
<br />
<br />
<br />Rain gardens are shallow depressions that
<br />coHect stormwater from impervious sur-
<br />faces and infiltrate, filter and evaporate the _
<br />runoff. Rain gardens are typically planted
<br />with a diverse mi" of l1a~ive wildflowers,
<br />grasses, shrubs and trees, and are an at..
<br />tracHve, low maintenance addDtion to your
<br />home landscape.
<br />
<br />Your rain gail"'c-Jen should have standfftllg tilater for no fotiger than 24 - 48
<br />hours. Mosquitoes generafiy tatw 7-10 days to complete their bre0dlny
<br />cycle, 50 your rain garden sfwufd not increase mosquito populations.
<br />
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<br />Map your prop-
<br />erty. Note topog-
<br />raphy, buildings,
<br />existing vegeta-
<br />tion and o~her
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<br />features. DetGr..
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<br />~11irile vJnere ex..
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<br />isting rt~~l{,rff
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<br />Calculate U;0
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<br />area of U1e ~rn..
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<br />f;'H~N~OUS st~rface
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<br />each dovJ'nsDo~t
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<br />f0 Desfgn yo;ur rain
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<br />to ensure the stormvvater ES capta.g"cd.
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<br />P~an for a cc-ntroHed over'[~O\i:l for ~a~"ge storm eve~"r2s.
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<br />f0 Choose a vaTse'iy 0'( n:;d~ve p'2re.nn~ais far YOtB'" r3~n g~;c.L::n, d-2~::2nc~-~~g C~1 s,~~i ::nd
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<br />nght concn:ions. 'ncIt~de at fec~st 40~/o gn?~sses 2~~d S[;~~~~S.S to r.:,ro~Jfdc s~~~::"-pc-r~ '~cr
<br />nOvJer s:~e~!;"'~s 2nd ~;1tI3'rest~n3 tGxtlE'GS.
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<br />Lxcavation
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<br />ro
<br />
<br />Locate any utilities in the area berore you dig (Gopher One-Cal! - 651 454
<br />0002).
<br />
<br />Remove the existing vegetation by using a sed-cutter, smothering with
<br />heavy black plastic ror several months, or applying a herbicide such as
<br />Round-Up@.
<br />
<br />ro
<br />
<br />ro
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<br />Dig a shallow bow! (6-9" deep at the center) with gently sloping sides.
<br />
<br />ro If clay or heavy soils are present you may need to over-excavate and back-
<br />fill with a lighter soil mixture (50% sand, 30% topsoil, 20% compost).
<br />
<br />ro Place excavated soil en the downhHl side to create a smaH berm. The
<br />berm should be sligMly lower than the rain garden !11~et to allow for a con-
<br />trolled overflow.
<br />
<br />ro Cover the berm with erosion control blanket ~o hold the loose soils in place
<br />while plants become established.
<br />
<br />ro
<br />
<br />Spread 2" of shredded hardwood mulch over the ,en~~re planting area.
<br />Woodchips tend to float and should be avoided.
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<br />Seedlings can be planted from
<br />mid-May to mid-September.
<br />Summer plantings may require
<br />frequent watering.
<br />
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<br />Plant sesdnngs 12'" a~;';1rt \fiJ~th
<br />more flood tolerant species
<br />toward the bottom a:!1d dmug;M
<br />tolerant species toward the
<br />top.
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<br />Plant species in large C8tmters
<br />to provide more V~St~a; impClct.
<br />
<br />
<br />Maintenance
<br />
<br />
<br />years.
<br />
<br />ro You ra~n garden V~1~~; reqH~re SO~1e 1~1a~~~e~ance for ~1'& ~east ibi~ f~rsf 1:\tllO
<br />
<br />ro Ensure that you rah1 gzrden reCehfGS et iGas'~ or-de inCh"1 of \fJ2~ter ~~2r "'A{GeE';'
<br />for the first 2 months. f'f vJater~ng ~s needed, g~ve YOi~r garden one goad
<br />soaking per wee!".
<br />
<br />lightly v'Ieed your ra~n garoen cr~ce a moniJl. Leav~ng p~ai1t tags rH;:}{t to
<br />your plugs or purchas~ng a p~2nf EEl boo',\. r[1czy he!p rn det0rrr'lEn~ng \!\!r.''dch
<br />p~ants are undes~rabk~.
<br />
<br />ro
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<br />m Dead p;ZJnt n13terEe'l1 C2.n be n~.rnc-\"'2d ~n th,s spr~ng to c;nOVJ more rao~-n for
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<br />neVlf grov.:th. f\flany n2t~ve SpGC~e5 hcnfe strc..:--.:g s;>~i?r~lS ~r~d 'i,:-\;,~H st~y StGd1d...
<br />
<br />~ng even 2fte'f a sno\!vlc:n. t1iHovJing {he ye2~'G grCVS.ri!1 to st8nd over v\.:intsr
<br />zdds visual ,nterest a~d ~ncrGases \\;~idn'c~ h21bHcl't.
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