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  03:57:40 pm on November 22nd, 0000   [ 091122  15:57:40 ]. Thank you for running online_oxygenation.  [090826]

 

online calc
normal depth	critical depth	discharge in culvert	critical slope	normal and critical depth	tractive force
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	discharge sluice	discharge weir	discharge channel	initial sequent HJ
critical constriction	efficiency HJ	ogee spillway	Hazen-Williams	parallel pipes	three reservoirs
Creager	rational	slope-area	linear reservoir	storage indication 1	storage indication 2
Muskingum	Muskingum-Cunge	time-area	Clark UH	cascade of linear reservoirs
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
convolution		S-hydrograph		time of concentration
UH cascade	dimensionless UH cascade		general UH cascade	series UH cascade	all series UH cascade
hyperbolic regression		one-predictor linear	one-predictor nonlinear	two-predictor linear	two-predictor nonlinear
fall velocity	Lane & Koelzer	USLE	USLE2	Dendy-Bolton	Shields
Duboys	Meyer-Peter	Modified Einstein	Colby 1957	Colby	reservoir design life
DO sag	DO sag analysis		Oxygenation	Salinity (EC to TDS)