online_culvert:   Hydraulic design of highway culverts by FHWA method Reference Hydraulic Design of Highway Culverts, HDS 5, Federal Highway Administration, Third Edition, 2012. DESCRIPTION: [Sample input]       [HW/D table]       [Main page] The program ONLINE_CULVERT calculates the diameter for the hydraulic design of a culvert using the FHWA Method for three types of culverts: Square edge with headwall, Groove end with headwall, and Groove end projecting. To determine the culvert diameter D, the calculator requires the following information: Design discharge Q (positive number) Inlet invert elevation z1 (positive number) Manning's n (allowable range: 0.013-0.030) Natural stream bed slope So (allowable range: 0.0001-0.1) Tailwater depth above outlet invert y2 (positive number) Culvert length L (positive number) Shoulder elevation Es (must be greater than inlet invert elevation z1) Freeboard Fb (zero or positive number) Entrance loss coefficient Ke (a choice between 1.0, 0.5, 0.12, and 0.03) (Pipe entrance in Table 5-3) Exit loss coefficient KE (a choice between 1.0, 0.92, 0.72, 0.42, and 0.16) (Expansion in Table 5-3)         Source:  Roberson, Hydraulic Engineering. The output consists of:  (1) culvert diameter D, (2) critical depth yc, (3) normal depth yn, (4) number of iterations, (5) type of flow (supercritical/subcritical), (6) presence of hydraulic jump/hydraulic drop, and (7) type of control (inlet/outlet). Thank you for running online_culvert   [150616]