Laserfiche WebLink
<br />Better Site Design <br /> <br />drain construction and avoidance of large offsite facilities. Also, even simple grading of the landscaped <br />areas to accept runoff can provide some storm water management. <br /> <br />Mai ntenance <br /> <br />Maintenance requirements, as well as relative expense, are summarized in Table 10.4. <br /> <br />Table 10.4: Comp~risoll'i of MaJ~81~ell1lalrnce aJlrncl (OS~ ~e~IlB~liemelrnts fOIi SeVeli21~ Stormwater Management <br />Fadiities (Clay\1:oli alrilcl Sd'llllBe~~Ii, 1.996) <br /> <br />Stormwater Management MCJintl!1ll'iall1la:e ~eG!n.oiliements . Relative Cost <br />fadlitics <br />Surface sand filter 0 trash removal every 6 months and after major storms moderate <br /> 0 mow to maintain grass at 18" <br />. <br /> 0 check and clean perforated standpipe and/or low flow orifice <br /> 0 remove deposited silt when:>> 1/2 inch in depth over filter bed <br />Underground $and filter 0 monitor water level in filter chamber (4 times a year for first year, high <br /> 2 times a year thereafter <br /> 0 pump out sediment chamber when sediment depth:>> 12 inches <br /> 0 remove deposited silt when:>> 1/2 inch in depth over filter bed <br />Perimeter sand filter 0 inspect 2 times a year and after major storms high <br /> 0 remove trash and debris <br /> 0 remove deposited silt when :>> 1(2 inch in depth over filter bed <br />Organic filter 0 replace compost every 3 - 4 years high <br /> 0 annual removal or roto-till of top layer <br /> 0 remove deposited silt when:>> 1/2 inch in depth over filter bed <br />Bioretention facility 0 maintain landscape vegetation low <br /> 0 annual inspection of plants <br /> 0 mulching 2 times a year <br /> 0 annual testing of soil bed for pH <br />Porous pavement'" 0 ~weeping or vacuuming moderate <br /> 0 replaced when clogged <br />Filter strip 0 mowing low <br /> 0 edge scrapping <br /> <br />~ Porous pavement alowe is approximately tthe same cost (2S comfentffowa! CiJSpnCJ1lft IIJfI' concrete. However, when <br />the cost far the underground storage resef1f!Jir is ff2d()rr~!d fro, porous pavemewt is more expensive than <br />conventional pavemen~o <br /> <br />;. 90- <br /> <br />": -" <br /> <br />J <br />