onlinechannel07.php:   Critical depth in a circular culvert or pipe Formulas θ = 2 cos-1[1 - 2(y/D)] A = (D2/8) (θ - sinθ) T = D sin(θ/2) V = Q/A (Q2T)/(gA3) = 1 INPUT DATA: Select:    SI units (metric) U.S. Customary units Pipe diameter D :   Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinechannel07.php on line 353 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel07.php on line 355 Discharge Q :   Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinechannel07.php on line 370 Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinechannel07.php on line 372 INTERMEDIATE CALCS: Relative depth yc / D:    Warning: Undefined variable $yrelacrit in /var/www/html/ponce/onlinechannel07.php on line 389 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel07.php on line 389 Angle θ:    Warning: Undefined variable $thetadegcrit in /var/www/html/ponce/onlinechannel07.php on line 390 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel07.php on line 390 Warning: Undefined variable $angleunits in /var/www/html/ponce/onlinechannel07.php on line 390 Flow area A:    Warning: Undefined variable $areacrit in /var/www/html/ponce/onlinechannel07.php on line 392 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel07.php on line 392 Warning: Undefined variable $areaunits in /var/www/html/ponce/onlinechannel07.php on line 392 Top width T:    Warning: Undefined variable $topwidthcrit in /var/www/html/ponce/onlinechannel07.php on line 393 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel07.php on line 393 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel07.php on line 393 Froude number F:    Warning: Undefined variable $froudecrit in /var/www/html/ponce/onlinechannel07.php on line 394 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel07.php on line 394 OUTPUT: Critical depth yc:    Warning: Undefined variable $yabsocrit in /var/www/html/ponce/onlinechannel07.php on line 398 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel07.php on line 398 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel07.php on line 398 Critical velocity vc:    Warning: Undefined variable $velocrit in /var/www/html/ponce/onlinechannel07.php on line 399 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel07.php on line 399 Warning: Undefined variable $velocityunits in /var/www/html/ponce/onlinechannel07.php on line 399   Your request was processed at  04:27:54 am on April 3rd, 2025   [ 250403  04:27:54 ]. Thank you for running onlinechannel_07.   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)