onlinepipe01.php:   Calculation of discharge in parallel pipes under turbulent flow Formulas: a = [(f2/f1)(L2/L1)]1/2 (D1/D2)5/2 Q1 = aQ/(a + 1) Q2 = Q/(a + 1) hL (0,1) = f1 (L1/D1) V12/(2g) hL (0,2) = f2 (L2/D2) V22/(2g) Units: SI units:  Q (m3 s-1), D (m), L (m). U.S. units:  Q (cfs), D (ft), L (ft). INPUT DATA: Select:    SI units (metric) U.S. Customary units Discharge Qo:       Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinepipe01.php on line 303 Diameter D1:       Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinepipe01.php on line 311 Length L1:      Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinepipe01.php on line 319 Friction factor f1:      Diameter D2:       Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinepipe01.php on line 335 Length L2:      Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinepipe01.php on line 343 Friction factor f2:      OUTPUT: Discharge Q1:    Warning: Undefined variable $discharge1 in /var/www/html/ponce/onlinepipe01.php on line 361 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinepipe01.php on line 361 Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinepipe01.php on line 361 Discharge Q2:    Warning: Undefined variable $discharge2 in /var/www/html/ponce/onlinepipe01.php on line 362 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinepipe01.php on line 362 Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinepipe01.php on line 362 Q1 + Q2:    Warning: Undefined variable $discharge00 in /var/www/html/ponce/onlinepipe01.php on line 363 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinepipe01.php on line 363 Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinepipe01.php on line 363 Head loss hL (0,1):    Warning: Undefined variable $headloss1 in /var/www/html/ponce/onlinepipe01.php on line 364 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinepipe01.php on line 364 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinepipe01.php on line 364 Head loss hL (0,2):    Warning: Undefined variable $headloss2 in /var/www/html/ponce/onlinepipe01.php on line 365 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinepipe01.php on line 365 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinepipe01.php on line 365 Press button to or recalculate   Your request was processed at  04:21:06 am on April 3rd, 2025   [ 250403  04:21:06 ]. Thank you for running onlinepipe01.php. [091004]

 

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)