online_explicit_darcy_weisbach:  Explicit equation for Darcy-Weisbach friction factor f Comparison of laminar and turbulent flow                        0.25 f = ________________________________________      {log[(ks/D)/3.7 + 5.74/Re0.9]}2 Explicit equation for discharge Explicit equation for diameter INPUT DATA: Relative roughness ks /D :         [Restricted to:  0.00001 < ks /D  < 0.02]   Warning: Undefined variable $headlossunits in /var/www/html/ponce/onlineexplicitdarcyweisbach.php on line 182 Reynolds number Re :         [Restricted to:  4000 < Re < 100,000,000]   Warning: Undefined variable $reynoldsnumberunits in /var/www/html/ponce/onlineexplicitdarcyweisbach.php on line 189 OUTPUT: f  =  Warning: Undefined variable $frictionfactor in /var/www/html/ponce/onlineexplicitdarcyweisbach.php on line 202 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlineexplicitdarcyweisbach.php on line 202 0     Your request was processed at  10:48:23 pm on April 3rd, 2025   [ 250403  22:48:23 ]. Thank you for running online_explicit_darcy_weisbach.   [160607]