online_convolution:   Flood hydrograph by convolution  Methods Description Reference Ponce, V. M. 1989. Engineering Hydrology, Principles and Practices. Prentice Hall, pages 185-187. [Sample input]         [Sample output] INPUT DATA: Units:    SI units (metric) U.S. Customary units (SI units) [U.S. Customary units] Rainfall time interval Δtr (hr):      Number of increments of rainfall intensity n:      Increments of rainfall intensity Ij (cm/hr) [in/hr] (separate each value with a comma; maximum string length is 300 characters). [NRCS runoff] curve number CN:      Unit hydrograph time interval Δt (hr):      Number of unit hydrograph ordinates m:      Unit hydrograph ordinates Qk (m3/s) [ft3/s] (start at 0, end at 0; separate each value with a comma; maximum string length is 300 characters). ECHO OF INPUT: Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlineconvolution.php on line 689 Warning: Undefined variable $nameunits in /var/www/html/ponce/onlineconvolution.php on line 691 Warning: Undefined variable $deltatr in /var/www/html/ponce/onlineconvolution.php on line 698 Warning: Undefined variable $deltatr in /var/www/html/ponce/onlineconvolution.php on line 700 Rainfall time interval Δtr =   hr               [Unit hydrograph duration tr =   hr] Warning: Undefined variable $nint in /var/www/html/ponce/onlineconvolution.php on line 701 Number of increments of rainfall intensity n =   Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlineconvolution.php on line 703 Warning: Undefined variable $intensityunits in /var/www/html/ponce/onlineconvolution.php on line 705 Increments of rainfall intensity (): Warning: Undefined variable $nint in /var/www/html/ponce/onlineconvolution.php on line 715 Warning: Undefined variable $int in /var/www/html/ponce/onlineconvolution.php on line 721 Warning: Trying to access array offset on null in /var/www/html/ponce/onlineconvolution.php on line 721 I1 =   .    Warning: Undefined variable $cn in /var/www/html/ponce/onlineconvolution.php on line 723 [NRCS runoff] curve number CN =                   Warning: Undefined variable $deltat in /var/www/html/ponce/onlineconvolution.php on line 727 Unit hydrograph time interval Δt =   hr Warning: Undefined variable $nuho in /var/www/html/ponce/onlineconvolution.php on line 729 Number of unit hydrograph ordinates m =   Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlineconvolution.php on line 731 Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlineconvolution.php on line 733 Unit hydrograph ordinates (): Warning: Undefined variable $nuho in /var/www/html/ponce/onlineconvolution.php on line 743 Warning: Undefined variable $uhor in /var/www/html/ponce/onlineconvolution.php on line 749 Warning: Trying to access array offset on null in /var/www/html/ponce/onlineconvolution.php on line 749 Q1 =  .    OUTPUT: Time interval Time (hr) Unit hydrograph (m3/s) Flood hydrograph (m3/s) 0 0 0 0   Your request was processed at  09:06:48 pm on April 3rd, 2025   [ 250403  21:06:48 ]. Thank you for running online_convolution.   Please call again.   [070516]

 

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)