Data Input
In order to input the required information for this pollutant into the Water Quality model, the user needs to make sure that the Tab Dissolved Oxygen appears in the WQ General Tab (please follow the description on the page Preparing a Water Quality Datafile for this). Then the user needs to select the Tab Dissolved Oxygen and type in the necessary information for this pollutant in the fields which are shown on this Tab. Alternatively the necessary information for this pollutant can be typed in the .con file opened in a Textpad editor in the datafile format mentioned below.
Datafile format
Line 1 DISSOLVED OXYGEN
Line 2 faircm, alpair, constc
Line 3 rkb20, alphab, sbrate
Line 4 rkn20, alphan, snrate
Line 5 rkam20, alpham, betam, salam, epsam1, epsam2, epsam3
Line 6 rkno20, alphn2
Where:
DISSOLVED OXYGEN = keyword
faircm = Reaeration parameters: reaeration coefficient (m/hour). if faircm is
set negative then Owen's, O'Conner and Dobbin's and Churchill's equations are applied).
alpair = temperature dependency factor for reaeration
constc = additional reaeration coefficient used at all structures
rkb20 = BODdecay parameters: rate constant at 20C (day)
alphab = BODdecay parameters: temperature coefficient
sbrate = BODdecay parameters: speed of slow decay rate as fraction of fast decay rate.
rkn20 = Organic nitrogen decay parameters: rate constant at 20C (day)
alphan = Organic nitrogen decay parameters: temperature coefficient
snrate = Organic nitrogen decay parameters: speed of slow decay rate as fraction of fast decay rate
rkam20 = Ammonia oxidation parameters: rate constant at 20C (day)
alpham = Ammonia oxidation parameters temperature coefficient
betam = Ammonia oxidation parameters salinity coefficient
salam = Ammonia oxidation parameters base salinity (ppt)
epsam1= Ammonia oxidation parameters suspended solids coefficient
epsam2 = Ammonia oxidation parameters base suspended solids (mg/l)
epsam3 = Ammonia oxidation parameters multiplication factor for base suspended solids
rkno20 = Nitrite to nitrate oxidation parameters: rate constant at 20C (day)
alphn2 = Nitrite to nitrate oxidation parameters: temperature coefficient.
Overview
Dissolved Oxygen