online_culvert:   Hydraulic design of highway culverts by FHWA method Reference Hydraulic Design of Highway Culverts, HDS 5, Federal Highway Administration, Third Edition, 2012. INPUT DATA: [Description]       [Sample input]       [HW/D Tables] Units:    SI units (metric) U.S. Customary units [U.S. units] (SI units) Type of Culvert:    A. Square edge with headwall B. Groove end with headwall C. Groove end projecting Discharge Q [cfs] (m3/s):    Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlineculvert.php on line 1948 Inlet invert elevation z1 [ft] (m):    Warning: Undefined variable $inelevationunits in /var/www/html/ponce/onlineculvert.php on line 1957 Manning's n:    Bottom slope So:    Warning: Undefined variable $slopeunits in /var/www/html/ponce/onlineculvert.php on line 1976 Tailwater depth above outlet invert y2 [ft] (m): Warning: Undefined variable $tailwaterdepthunits in /var/www/html/ponce/onlineculvert.php on line 1986 Culvert length L [ft] (m):    Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlineculvert.php on line 1996 Shoulder elevation Es [ft] (m):    Warning: Undefined variable $shoulderelevunits in /var/www/html/ponce/onlineculvert.php on line 2006 Freeboard Fb [ft] (m):    Warning: Undefined variable $freeboardunits in /var/www/html/ponce/onlineculvert.php on line 2015 Entrance loss coefficient Ke:    1.0 0.5 0.12 0.03 Exit loss coefficient KE:    1.00 0.92 0.72 0.42 0.16 OUTPUT: Please enter input data and press 'Calculate'.   Your request was processed at  11:00:17 pm on April 3rd, 2025   [ 250403  23:00:17 ]. Thank you for running online_culvert   [150914]