online_dispersivity:  Calculation of convection, diffusion, and dispersion coefficients of flood wave propagation    [ SI Units:  uo in m/s; yo in m ] [ U.S. Units:  uo in fps; yo in ft ] Reference F = uo / (g yo)1/2 V = (β - 1) F qo = uo yo Lo = yo / So c = [ 1 + (V / F ) ] uo ν = (Lo / 2) uo ( 1 - V 2 ) η = (Lo / 2) 2 uo ( 1 - V 2 ) F 2 c' = 1 + (V / F ) ν' = (1/2) ( 1 - V 2 ) η' = (1/4) ( 1 - V 2 ) F 2 F = Froude number; V = Vedernikov number. INPUT DATA: Select:       SI units (metric) U.S. Customary units Mean velocity uo :         Warning: Undefined variable $velocityunits in /var/www/html/ponce/onlinedispersivity.php on line 199 Flow depth yo :         Warning: Undefined variable $depthunits in /var/www/html/ponce/onlinedispersivity.php on line 205 Channel slope So :         Warning: Undefined variable $slopeunits in /var/www/html/ponce/onlinedispersivity.php on line 211 Rating exponent β :       OUTPUT: Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinedispersivity.php on line 245 SI units (metric) ♦  Froude F :    Warning: Undefined variable $froude in /var/www/html/ponce/onlinedispersivity.php on line 258 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinedispersivity.php on line 258 ♦  Vedernikov V :    Warning: Undefined variable $vedernikov in /var/www/html/ponce/onlinedispersivity.php on line 260 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinedispersivity.php on line 260 ♦  Celerity c :    Warning: Undefined variable $celerity in /var/www/html/ponce/onlinedispersivity.php on line 262 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinedispersivity.php on line 262   Warning: Undefined variable $celerityunits in /var/www/html/ponce/onlinedispersivity.php on line 262 ♦  Diffusivity ν :    Warning: Undefined variable $diffusivity in /var/www/html/ponce/onlinedispersivity.php on line 264 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinedispersivity.php on line 264   Warning: Undefined variable $diffusivityunits in /var/www/html/ponce/onlinedispersivity.php on line 264 ♦  Dispersivity η :    Warning: Undefined variable $dispersivity in /var/www/html/ponce/onlinedispersivity.php on line 266 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinedispersivity.php on line 266   Warning: Undefined variable $dispersivityunits in /var/www/html/ponce/onlinedispersivity.php on line 266 ♦  Celerity c' :    Warning: Undefined variable $celerityp in /var/www/html/ponce/onlinedispersivity.php on line 268 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinedispersivity.php on line 268 ♦  Diffusivity ν' :    Warning: Undefined variable $diffusivityp in /var/www/html/ponce/onlinedispersivity.php on line 270 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinedispersivity.php on line 270 ♦  Dispersivity η' :    Warning: Undefined variable $dispersivityp in /var/www/html/ponce/onlinedispersivity.php on line 272 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinedispersivity.php on line 272 Press button to or recalculate   Your request was processed at  10:44:42 pm on April 3rd, 2025   [ 250403  22:44:42 ]. Thank you for running   online_dispersivity   Please call again.   [210718]