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The Essentials of Cover for Stormwater Detention Systems In plastic retention detention systems, the earth cover needed is usually a bit higher compared to metal, and it does have an upper limit This applies to both plastic pipe and chambers Their minimum and maximum earth cover is usually listed in their respective backfill details
Minimum Allowable Depth - Concrete Pipe In accordance with Section 12 6 6 of the AASHTO LRFD Bridge Design Specifications, 9th Edition, the minimum cover for a rigid pipe such as reinforced concrete pipe (RCP) is the greater of 1 8 the outside diameter of the pipe or 12 inches, when there is only soil or flexible pavement above it
PVC Below Ground Installation - Vinidex Pty Ltd Absolute minimum underlay should be 75 mm It may be necessary to provide a groove under each socket to ensure that even support along the pipe barrel is achieved
Q A - Prinsco, Inc Minimum covers assume Class III backfill material compacted to 90% standard Proctor density around the pipe and a minimum of 6-inches over the pipe crown For construction loading, additional backfill may be necessary
GOLDPRO STORMTM Minimum and Maximum Burial Depths Pipe with diameters of 12‐ to 48‐inch installed subjected to AASHTO HL‐93, H‐25 or HS‐25 traffic loads must have at least one foot cover over the pipe crown, while 60‐inch diameter pipe must have at least 18 inches of cover
Corrugated Metal Pipe Detention Design Guide Typically, the minimum cover specified for a project assumes H-20 live load Because construction loads often exceed design live loads, increased temporary minimum cover requirements are necessary
101D Trench Installation (HP Storm Pipe) Detail Table 1 is the recommended minimum trench width with pipe diameter sizes and minimum trench width measurements Table 2 shows the minimum cover based on vehicle loading condition with pipe diameter and values for surface live loading conditions
750. 4 Storm Sewers - Engineering Policy Guide When a conduit is located under the pavement, the top of the conduit is held to a depth of at least 6 in below the bottom of the base course The maximum depth of cover is controlled by fill and other dead loads