"; echo " onlinechannel01:    *** Error message 1 ***    Please enter only positive number for discharge.   Execution stops here. "; echo "
"; die; } // branch 202 close } // branch 201 close if($_POST["manningsn"] <= 0) { // branch 203 open if($_POST["Submit"] == 'Calculate') { // branch 204 open echo "





"; echo " onlinechannel01:    *** Error message 2 ***    Please enter only positive number for manning's n.   Execution stops here. "; echo "
"; die; } // branch 204 close } // branch 203 close if($_POST["bottomslope"] <= 0) { // branch 205 open if($_POST["Submit"] == 'Calculate') { // branch 206 open echo "





"; echo " onlinechannel01:    *** Error message 3 ***    Please enter only positive number for bottom slope.   Execution stops here. "; echo "
"; die; } // branch 206 close } // branch 205 close if($_POST["bottomwidth"] < 0) { // branch 207 open if($_POST["Submit"] == 'Calculate') { // branch 208 open echo "





"; echo " onlinechannel01:    *** Error message 4 ***    Please enter only nonnegative number for bottom width.   Execution stops here. "; echo "
"; die; } // branch 208 close } // branch 207 close if($_POST["sideslope"] < 0) { // branch 209 open if($_POST["Submit"] == 'Calculate') { // branch 210 open echo "





"; echo " onlinechannel01:    *** Error message 5 ***    Please enter only nonnegative number for side slope.   Execution stops here. "; echo "
"; die; } // branch 210 close } // branch 209 close if(($_POST["bottomwidth"] == 0) && ($_POST["sideslope"] == 0)) { // branch 211 open if($_POST["Submit"] == 'Calculate') { // branch 212 open echo "





"; echo " onlinechannel01:    *** Error message 6 ***    Bottom width and side slope cannot be zero at the same time.   Execution stops here. "; echo "
"; die; } // branch 212 close } // branch 211 close // end of check for input errors or inconsistencies //set unit systems $unitsystems = 0; // default value if(isset($_POST["unitsystems"])) { // branch 301 open $unitsystems = $_POST["unitsystems"]; } // branch 301 close if ($unitsystems == 1) { // branch 302 open $g= 32.17; $c= 1.486; $lengthunits = "ft"; $areaunits = "ft2"; $velocityunits = "fps"; $dischargeunits = "cfs "; $accelerationunits = "ft s-2"; $unitsystemsname = "U.S. Customary"; } // branch 302 close elseif($unitsystems == 0) { // branch 303 open $g = 9.806; $c = 1.0; $lengthunits = "m"; $velocityunits = "m s-1"; $areaunits = "m2"; $dischargeunits = "m3 s-1"; $accelerationunits = "m s-2"; $unitsystemsname = "SI (metric)"; } // branch 303 close //main calculations $iflag= 0.; $kflag= 0.; $tol= 0.0001; $x = 0.; $dx = 1.; $q = $_POST["discharge"]; $b = $_POST["bottomwidth"]; $z = $_POST["sideslope"]; $s = $_POST["bottomslope"]; $xn = $_POST["manningsn"]; //main while loops while($kflag == 0) { // branch 401 open $y = + pow(($x*(0.5*$b + 0.5*$z*$x)),2.5) - pow(($q*$xn/(2*$c*pow($s,0.5))),1.5)*pow((1 + pow($z,2)),0.5)*$x - 0.5*pow(($q*$xn/(2*$c*pow($s,0.5))),1.5)*$b; $jflag = 0; while($jflag == 0) { // branch 402 open if($y < 0.) { // branch 403 open $x = $x + $dx; $jflag = 1; } // branch 403 close else { // branch 404 open while($iflag == 0) { // branch 405 open $y = + pow(($x*(0.5*$b + 0.5*$z*$x)),2.5) - pow(($q*$xn/(2*$c*pow($s,0.5))),1.5)*pow((1 + pow($z,2)),0.5)*$x - 0.5*pow(($q*$xn/(2*$c*pow($s,0.5))),1.5)*$b; $yp = + 1.25*$z*pow($x,2.5)*pow((0.5*$b + 0.5*$z*$x),1.5) + 2.5*pow($x,1.5)*pow((0.5*$b + 0.5*$z*$x),2.5) - pow(($q*$xn/(2*$c*pow($s,0.5))),1.5)*pow((1 + pow($z,2)),0.5); $xr = $x - $y/$yp; if(abs($xr - $x) < $tol) { // branch 406 open $iflag= 1; $jflag= 1; $kflag= 1; } // branch 406 close $x = $xr; } // branch 405 close } // branch 404 close } // branch 402 close } // branch 401 close //redefine output $yn = $x; $an = ($b + $z*$yn)*$yn; $pn = $b + 2*$yn*pow((1 + pow($z,2)),0.5); $tn = $b + 2*$z*$yn; $rn = $an/$pn; $vn = $q/$an; $dn = $an/$tn; $fn = $vn/(pow(($g*$dn),0.5)); } // branch 101 close //--------------------------------------------------------------------------------------------------------------------------------------------------------------- ?>



    onlinechannel01.php:   Normal depth in a prismatic channel
Definition sketch for a prismatic channel
Formulas:

A = y(b + zy)
P = b + 2y(1 + z2)1/2
T = b + 2zy
R = A/P
D = A/T
Q = (k/n) AR2/3S1/2
V = Q/A
F = V/(gD)1/2
INPUT DATA:

Select:   

Flow discharge Q:        

Bottom width b:        

Side slope z:      

Bottom slope S:      

Manning's n:      

INTERMEDIATE CALCS:

Units selected:   

Gravitational acceleration g:   

Units constant k:   

Wetted perimeter P:   

Top width T:   

Flow area A:   

Hydraulic radius R:   

Hydraulic depth D:   

OUTPUT:

Normal flow depth yn:   

Normal flow velocity Vn:   

Normal Froude number Fn:   

            

  Your request was processed at "; echo " "; echo date('h:i:s a \o\n F jS, Y'); ?>    [  ].

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