Town of North Reading Subdivision Rules and Regulations
Drainage System and Hydraulic Design Parameters
[Added 2-26-1991]
Minimum pipe specification (SDR 35 Solid Wall PVC Pipe)
(RCP, Class III, Wall B)
Minimum roughness coefficient n = 0.012
Minimum pipe size 12 inch
Minimum depth over pipe 21/2 feet
Minimum pipe capacity 25-year storm event
Minimum design velocity 2.0 fps @ 5-year event
Maximum design velocity 15.0 fps @ 25-year event
Maximum catch basin spacing 300 feet
Maximum manhole spacing 300 feet
Minimum drop through manholes 0.10 feet
Culvert design capacity 100-year storm event
Minimum culvert size 18 inches
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