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)

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