onlinechannel17.php:   Critical flow in width constriction in rectangular channel Critical flow in width constriction Formulas: v1 = Q/(b1y1) F1 = v1/(gy1)1/2 σ = 271/2 F1/(2 + F12)3/2 bc = σb1 q = Q/bc yc = (q2/g)1/3 vc = q/yc INPUT DATA: Select:    SI units (metric) U.S. Customary units Discharge Q:   Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinechannel17.php on line 161 Channel width b1:   Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel17.php on line 169 Flow depth y1:  Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel17.php on line 178 INTERMEDIATE CALCS: Units selected:    Warning: Undefined variable $unitsystemsname in /var/www/html/ponce/onlinechannel17.php on line 186 Gravitational acceleration g:    Warning: Undefined variable $gravity in /var/www/html/ponce/onlinechannel17.php on line 187 Warning: Undefined variable $accelerationunits in /var/www/html/ponce/onlinechannel17.php on line 187 Flow velocity v1:    Warning: Undefined variable $usflowvelocity in /var/www/html/ponce/onlinechannel17.php on line 188 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel17.php on line 188 Warning: Undefined variable $velocityunits in /var/www/html/ponce/onlinechannel17.php on line 188 Froude number F1:    Warning: Undefined variable $usfroudenumber in /var/www/html/ponce/onlinechannel17.php on line 189 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel17.php on line 189 σ:    Warning: Undefined variable $sigma in /var/www/html/ponce/onlinechannel17.php on line 190 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel17.php on line 190 OUTPUT: Constriction width bc:    Warning: Undefined variable $channelwidthc in /var/www/html/ponce/onlinechannel17.php on line 200 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel17.php on line 200 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel17.php on line 200 Unit-width discharge q:    Warning: Undefined variable $dischargequ in /var/www/html/ponce/onlinechannel17.php on line 201 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel17.php on line 201 Warning: Undefined variable $dischargequnits in /var/www/html/ponce/onlinechannel17.php on line 201 Constriction depth yc:    Warning: Undefined variable $flowdepthc in /var/www/html/ponce/onlinechannel17.php on line 202 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel17.php on line 202 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel17.php on line 202 Constriction velocity vc:    Warning: Undefined variable $velocityc in /var/www/html/ponce/onlinechannel17.php on line 203 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel17.php on line 203 Warning: Undefined variable $velocityunits in /var/www/html/ponce/onlinechannel17.php on line 203   Your request was processed at  04:33:53 am on April 3rd, 2025   [ 250403  04:33:53 ]. Thank you for running onlinechannel17.php.   Please call again.   [140618]

 

online calc
normal depth	critical depth	normal and critical depth		discharge in channel	critical slope
normal depth in culvert	critical depth in culvert	discharge in culvert		discharge sluice	discharge weir
M1 wsprofile	M2 wsprofile	M3 wsprofile	S1 wsprofile	S2 wsprofile	S3 wsprofile
C1 wsprofile	H2 wsprofile	A2 wsprofile	C3 wsprofile	H3 wsprofile	A3 wsprofile
sequent depth HJ	energy loss HJ	initial sequent HJ	efficiency HJ	critical width constriction
ogee spillway	Hazen-Williams	parallel pipes	three reservoirs	tractive force
V-notch weir	V-notch partially contracted	Cipolletti weir	Rectangular weir	Standard contracted rectangular weir	Standard suppressed rectangular weir
Froude number		Vedernikov number		Limiting contracting ratio
Creager	rational	slope-area	linear reservoir	storage indication 1	storage indication 2
Muskingum	Muskingum-Cunge	time-area	Clark UH	Cascade of linear reservoirs
USGS Methods for magnitude of floods in California	Kinematic wave applicability	Diffusion wave applicability	Clark's unit hydrography compared to Ponce's version	Correlation coefficient of a joint probability distribution	Storage volume of a detention basin
Blaney-Criddle	Penman	Penman-Monteith reference crop	Thornthwaite	Priestley-Taylor	Penman-Monteith ecosystems
Gumbel	Gumbel 2	Log Pearson	Log Pearson 2	TR-55 graphical	curve number
Overland flow using the diffusion wave method	Dynamic hydraulic diffusivity	convolution	S-hydrograph	time of concentration	water balance
UH cascade	dimensionless UH cascade		general UH cascade	series UH cascade	all series UH cascade
one-predictor linear	one-predictor nonlinear	two-predictor linear	two-predictor nonlinear	hyperbolic regression
fall velocity	Lane & Koelzer	USLE	USLE2	Dendy-Bolton	Shields
Duboys	Meyer-Peter	Colby 1957	Colby	reservoir design life	Equilibrium channel top width using the Lane et al. theory
Modified Einstein Procedure		bridge scour using Melville equation
DO sag	DO sag analysis		Oxygenation	Salinity (EC to TDS)

online calc
normal depth	critical depth	discharge in culvert	critical slope	normal and critical depth	tractive force
M1 wsprofile	M2 wsprofile	M3 wsprofile	S1 wsprofile	S2 wsprofile	S3 wsprofile
C1 wsprofile	H2 wsprofile	A2 wsprofile	C3 wsprofile	H3 wsprofile	A3 wsprofile
sequent depth HJ	energy loss HJ	discharge sluice	discharge weir	discharge channel	initial sequent HJ
critical constriction	efficiency HJ	ogee spillway	Hazen-Williams	parallel pipes	three reservoirs
Creager	rational	slope-area	linear reservoir	storage indication 1	storage indication 2
Muskingum	Muskingum-Cunge	time-area	Clark UH	cascade of linear reservoirs
Blaney-Criddle	Penman	Penman-Monteith reference crop	Thornthwaite	Priestley-Taylor	Penman-Monteith ecosystems
Gumbel	Gumbel 2	Log Pearson	Log Pearson 2	TR-55 graphical	curve number
convolution		S-hydrograph		time of concentration
UH cascade	dimensionless UH cascade		general UH cascade	series UH cascade	all series UH cascade
hyperbolic regression		one-predictor linear	one-predictor nonlinear	two-predictor linear	two-predictor nonlinear
fall velocity	Lane & Koelzer	USLE	USLE2	Dendy-Bolton	Shields
Duboys	Meyer-Peter	Modified Einstein	Colby 1957	Colby	reservoir design life
DO sag	DO sag analysis		Oxygenation	Salinity (EC to TDS)