Streeter-Phelps Calculator

Dissolved-oxygen profile downstream of a discharge.

River upstream

River flow (m³/s)

Upstream DO (mg/L)

Upstream BOD5 (mg/L)

River temperature (°C)

Discharge

Discharge flow (m³/s)

Discharge DO (mg/L)

Discharge BOD5 (mg/L)

Discharge temperature (°C)

Reach hydraulics

Mean velocity (m/s)

Mean depth (m)

Analysis distance (km)

DO standard (minimum) (mg/L)

Kinetic constants

k1 deoxygenation (20°C) (1/d)

k2 reaeration (20°C) (1/d)

Enter your data above and press Calculate to see the results.

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Model the whole river in the prediction engine

Import your QUAL2Kw workbook or open the example project. Results reproduce 15 calibrated QUAL2Kw models within 5% or a small absolute band.

See the prediction engine

Streeter, H.W. & Phelps, E.B. (1925). A study of the pollution and natural purification of the Ohio River. Public Health Bulletin 146. O'Connor, D.J. & Dobbins, W.E. (1958). Mechanism of reaeration in natural streams. ASCE Transactions 123, 641-684. Churchill, M.A., Elmore, H.L. & Buckingham, R.A. (1962). The prediction of stream reaeration rates. J. Sanitary Eng. Div. ASCE 88(4). Owens, M., Edwards, R.W. & Gibbs, J.W. (1964). Some reaeration studies in streams. Int. J. Air Water Pollution 8, 469-486. Benson, B.B. & Krause Jr., D. (1980). Limnology and Oceanography 25(4), 662-671. Regulation: Decreto 1076 de 2015 (Colombia) - water quality criteria.