HEC-14 Riprap Apron

Units: EnglishMetric

RSP class: Caltrans (new)Caltrans (previous)FHWA FP-14

Input Flow Q (ft3/s) Pipe diameter D (in) Grade SL (%) Manning's n Tailwater depth TW (ft) Riprap specific gravity: Sw

Results Normal depth Hn (in): x.xx Average velocity V (ft/s): x.xx Froude number Fr: x.xx Mean stone size D50 (in): x.xx Mean stone weight W (lb): x.xx Riprap class: x.xx Class D50 (in): x.xx Riprap thickness (ft): x.xx Riprap length (ft): x.xx

Revised 24 Jan 2018.