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• <br />• <br />NO - TOO DEEP <br /> <br /> <br /> <br /> <br /> <br />Do not change stream bottom elevation? <br />c. Install culverts at natural stream grade. <br />NO - TOO ITIGH <br />YES <br />Roadbed 2 <br />Slope l <br />30 cm miry. ;?.:d•°.' <br />Seed and mulch or protect <br />with riprap <br /> <br /> <br /> At least 30 ::, i of cover <br /> for CMP or one-third of <br /> diameter for large <br /> culverts. Use 60 can <br />Roadbed cover for concrete pipe. <br />O '? : °. '' • •' •.'v. @.•?, g. 7 A •.4 1* n .r: , ?' 1 : 'yO !i O.a~S1 y §:d q .r `"0\';.''." r <br />Base and sidewall fill <br /> <br />material should be o = N. Tam backfill material at <br />v p <br /> o r# + Y ..,regular intervals (lifts) of <br />.r b * b +° =Ot'' <br />' <br />compacted. Compact the q? <br />a z • :,, <br />-15 to 20 cm. <br />- '? n <br />~, } ` <br />fill a minimum of one ; <br />t <br />v <br />culvert diameter on each s•`;. v'?"" <br />'?y <br />o <br />side of the culvert. tt ?p +a°y. b Culvert ,. es d 'R Level of <br /> natural <br /> streambed <br />Existing ground <br />• <br />gravel or soil <br />culvert bed <br />(no rock larger than 8 cm) <br />Low-VOLUME RoADs BMPs 80