online_scour_hec18:  Calculation of bridge scour using the HEC-18 formula   
Formula:

Fr1 = v1/(g y1)1/2

ys /y1 = 2 K1 K2 K3 (a / y1)0.65 Fr10.43

[ SI Units (metric):  ys, y1, a, and L in m ]
[ U.S. Customary Units:  ys, y1, a, and L in ft ]
[ Fr = Froude number; g = gravitational acceleration ]

Reference:

Evaluating Scour at Bridges,
FHWA Hydraulic Engineering Circular No. 18,
 Fifth Edition, 2012.

INPUT DATA:      [Description]     [Sample Input]

Select:      

Flow depth y1 :      

 
Warning: Undefined variable $flowdepthunits in /var/www/html/ponce/onlinescourhec18.php on line 279

Flow velocity v1 :      

 
Warning: Undefined variable $flowvelocityunits in /var/www/html/ponce/onlinescourhec18.php on line 285

Pier width a :      

 
Warning: Undefined variable $pierwidthunits in /var/www/html/ponce/onlinescourhec18.php on line 291

Pier length L :      

 
Warning: Undefined variable $pierlengthunits in /var/www/html/ponce/onlinescourhec18.php on line 297

Angle of attack θ of the flow (degrees):      

 
Warning: Undefined variable $angleofattackunits in /var/www/html/ponce/onlinescourhec18.php on line 306

Pier nose shape:      

Bed condition:      

OUTPUT:


Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinescourhec18.php on line 351
System of units:  SI units (metric)


Warning: Undefined variable $piernoseshape in /var/www/html/ponce/onlinescourhec18.php on line 368
Pier nose shape:  Square nose


Warning: Undefined variable $bedcondition in /var/www/html/ponce/onlinescourhec18.php on line 399
Bed condition:  Clear-water scour

♦  Scour depth ys :   
Warning: Undefined variable $scourdepth in /var/www/html/ponce/onlinescourhec18.php on line 428

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinescourhec18.php on line 428
 
Warning: Undefined variable $flowdepthunits in /var/www/html/ponce/onlinescourhec18.php on line 428

Press button to
or recalculate

  Your request was processed at  03:56:10 am on April 3rd, 2025   [ 250403  03:56:10 ].

Thank you for running   online_scour_hec18   Please call again.   [171021]

Documents in Portable Document Format (PDF) require Adobe Acrobat Reader 5.0 or higher to view; download Adobe Acrobat Reader.