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BMP'S FOR RUNOFF COLL~ION • <br />Itl.6 Corrugated Metal Culverts <br />Purpose: Corrugated metal culverts are used to remove water from <br />roadways. They can also be used to divert water around areas or <br />structures. <br />Application: Corrugated metal culverts are permanent water conveyance <br />structures that can be used on all types of roadways. <br />Specrficattons: (See Figure Ill-6) <br />1. Culverts should be long enough to reach across the roadway and <br />extend beyond the till slope. )n addition, culvert outlets must have <br />erosion control structures installed below them to prevent erosion. <br />2. When installed to convey a stream under a roadway, they should <br />be large enough to carry the maximum stream volume as well as <br />any additional seasonal runoff. PJOte: Culvert size should comply <br />with the Idaho Department of Water Resources requirements. <br />(See Appendix A) <br />3. Install the culvert to firm, compacted sou with a minimum cover of <br />twelve (12) inches of soil. <br />Maintenance: Culverts need to be inspected on a regular basis. They <br />should be cleaned and/or repaired when necessary. <br />~~ <br />- ~ 1 <br /> <br />J .~ ~.. <br />•.~ O, <br />vz oi. <br />yr r'rJ~ <br />. /'~ <br />SECTION <br />Figure A-7 <br />Typical Culvert Installation <br />(Idaho 19911 <br />Of[fl rC Vrf <br />~,r,a torso <br />