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City of Eugene <br />Public Works t ngincering <br />IVIA-tal Pipe Design Policy <br />For Storm Drains and Culv6rts <br />APPROVED <br />November ;Z 1, 2,011 <br />A. I]E SIGNING METAL PEPS WALL THICKNESS FOR SERVICE LWE <br />Wall thickness and corrosion and abrasion counntenneasures for metal pipe shall'be designed <br />and selectedper the nmt currentversiaft of the Oregon Department ofTransportation <br />Hydrautigs; Desigg Manual. Service Life for all metal pi M shall be 75 yea <br />B. SPECIAL CONDITIONS FOR T:UF,'USV OF'METAL l"PE <br />The folloNving conditions mid limitations shall apply to all stonn drain designs involving <br />metal pipe. <br />.1. All galvanized doel-vigg, shall be polymeric coated outside and invert -paved inside <br />Aluminuni pipe need not be so protected. Inverts of corrugated galvanized steel pipe shall <br />be paved with a minimuni of 118" cover over earrugation ridges. T <br />nvert paving shall <br />cover 4fr/a of the inside -pipe eircumberenco. <br />2.1 pH and electrical resistivity tests sh;W] be made of the soils and of at all proposed <br />nietal pipe instalWons. Soils tests shall be taken at approximate ly 500 -foot intervals <br />along the pipeline and at additional locations m need- to collect rep. mmtativv Soil <br />saniples; within the project limits. <br />3. Since 'interior paying isnot expWed to survive, the, entire Servite, Life, reductions of <br />Mannings "tVvalue beloW 'flie normal value f4,r comagated pipe evil! Ul pQt be permitted. <br />4, When both corn ted metal and concrete (or plastic) pipe are specified as alternates an a <br />project, plans shall be drawn showing the concrete (or plastic) alternative, Separate. <br />hydraulic, and structural studies ahall be provided to suivort,the corrugated pipe design. W <br />different alignment or grade designs are required for the corrugated alte-mate, additional <br />planipm.file information shall be provided to the contractor for bidding purposes. <br />5. Pips gauge chosen shall provide ad -equate strength A)r the height of, fill over the pipe and <br />live loadir and to limit deformation of pipe in place to 5% of the pipe diameter, <br />6, Use the fill Height tables in the most current ver4on of the Standard Drawings <br />(RD 380, 382, and 354): For indallations in locations which may be affected by <br />z athod itally pmt c eted facilities (such as gas Jiiw, underground tanks, etc, the desi per <br />shalt determine the ownership of the protected facility, the extent of the electrical field, <br />Matd Mpe Dasip Policy, November 2011 <br />PIDS Manual 2016, Appendix I - 1 <br />