onlinechannel15a.php:   Discharge in a prismatic channel using the Manning equation, with two side slopes Definition sketch for a prismatic channel Formulas: P = b + 2y(1 + z2)1/2 T = b + 2zy A = y(b + zy) R = A/P D = A/T Q = (C/n) AR2/3S1/2 V = Q/A F = V/(gD)1/2 INPUT DATA: Select:    SI units (metric) U.S. Customary units Bottom width b:   Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15a.php on line 202 Flow depth y:   Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15a.php on line 210 Side slope z1:   Side slope z2:   Manning's n:   Bottom slope S:   INTERMEDIATE CALCS: Units selected:    Warning: Undefined variable $unitsystemsname in /var/www/html/ponce/onlinechannel15a.php on line 246 Gravitational acceleration g:    Warning: Undefined variable $gravity in /var/www/html/ponce/onlinechannel15a.php on line 247 Warning: Undefined variable $accelerationunits in /var/www/html/ponce/onlinechannel15a.php on line 247 Constant C:    Warning: Undefined variable $constant in /var/www/html/ponce/onlinechannel15a.php on line 248 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 248 Wetted perimeter P:    Warning: Undefined variable $wettedperimeter in /var/www/html/ponce/onlinechannel15a.php on line 249 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 249 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15a.php on line 249 Top width T:    Warning: Undefined variable $topwidth in /var/www/html/ponce/onlinechannel15a.php on line 250 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 250 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15a.php on line 250 Flow area A:    Warning: Undefined variable $flowarea in /var/www/html/ponce/onlinechannel15a.php on line 251 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 251 Warning: Undefined variable $areaunits in /var/www/html/ponce/onlinechannel15a.php on line 251 Hydraulic radius R:    Warning: Undefined variable $hydraulicradius in /var/www/html/ponce/onlinechannel15a.php on line 252 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 252 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15a.php on line 252 Hydraulic depth D:    Warning: Undefined variable $hydraulicdepth in /var/www/html/ponce/onlinechannel15a.php on line 253 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 253 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinechannel15a.php on line 253 OUTPUT: Discharge Q:    Warning: Undefined variable $discharge in /var/www/html/ponce/onlinechannel15a.php on line 261 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 261 Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinechannel15a.php on line 261 Flow velocity V:    Warning: Undefined variable $flowvelocity in /var/www/html/ponce/onlinechannel15a.php on line 263 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 263 Warning: Undefined variable $velocityunits in /var/www/html/ponce/onlinechannel15a.php on line 263 Froude number F:    Warning: Undefined variable $froudenumber in /var/www/html/ponce/onlinechannel15a.php on line 265 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinechannel15a.php on line 265   Your request was processed at  10:54:16 pm on April 3rd, 2025   [ 250403  22:54:16 ]. Thank you for running onlinechannel15a.php.   Please call again.   [190605]

 

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)