online_oxygenation:   Oxygenation constant ko in a stream     [ ko is at T = 20oC ] O'Connor and Dobbins (1958):   ko = 3.93 V0.5 D-1.5 [0.3 m < D < 9 m; 0.15 m/s < V < 0.5 m/s] Churchill et al. (1962):   ko = 5.23 V D-1.67 [0.6 m < D < 3 m; 0.55 m/s < V < 1.5 m/s] Owens et al. (1964):   ko = 5.32 V0.67 D-1.85 [0.1 m < D < 3 m; 0.03 m/s < V < 1.5 m/s] Tsivoglou and Wallace (1972):   ko = 31,000 VS [0.3 m < D < 0.9 m; 0.03 m3/s < Q < 0.3 m3/s]      [ ko is at T = 20oC ]    Melching and Flores (1999):    1. Pool and riffle streams, Q ≤ 0.556 m3/s:   ko = 517 (VS)0.524 Q-0.242    2. Pool and riffle streams, Q > 0.556 m3/s:   ko = 596 (VS)0.528 Q-0.136    3. Channel-control streams, Q ≤ 0.556 m3/s:   ko = 88 (VS)0.313 D-0.353    4. Channel-control streams, Q > 0.556 m3/s:   ko = 142 (VS)0.333 D-0.66 W-0.243 [Please note that the oxygenation (or reaeration) constant ko is referred to as k2 in some textbooks].   Variation of ko with water temperature:   ko,T = ko,20 θ(T - 20)   θ = 1.025   Minimum value of ko:   ko,min = 0.6/D Source: Chin, D. A. 2006. Water quality engineering in natural systems, Wiley. INPUT DATA: Stream (optional):      Velocity V (m/s):      Depth D (m):      Slope S (m/m):      Discharge Qs (m3/s):      Top width W (m):      Water temperature T (oC):      OUTPUT: Formula Applicability ko (day-1) Comments (out of range)           Your request was processed at  10:57:47 am on February 20th, 2025   [ 250220  10:57:47 ]. Thank you for running online_oxygenation.  [110928]

 

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)