Units
 
 Flow Units = hm3/year = cubic hectometers per year
 = million cubic meters per year
 = ft3/sec x .8931
 = m3/sec x .3154
 = million gal/day x 1.382
 
 Conc. Units = mg/m3 = milligrams per cubic meter
 = parts per billion= micrograms per liter
 = parts per million x 1000
 
 Load Units = kg/year = kilograms per year
 = lbs/year x .4545
 = lbs/day x 166.
 
 Areal Load Units = kg/km2-yr = kilograms per sq kilometer per year
 = mg/m2-yr = milligrams per sq meter per year
 = lbs/acre-yr x 112.3
 = lbs/mi2-yr x .175
 
 Area Units = km2 = square kilometers
 = hectares x .01
 = acres x .004047
 = square miles x 2.59
 
 Volume Units = hm3 = cubic hectometers
 = square kilometers x meters
 = acre-ft x .001234
 
 Length Units = km = kilometers
 = meters x .001
 = feet x .000305
 = miles x 1.609
 

Flow Units -    I M P O R T A N T     N O T E
 
Tributary flow rates specified on input screens and flows listed in mass-balance tables are expressed in units of million cubic meters per year (hm3/yr).
 
These are MEAN FLOW RATES during the AVERAGING PERIOD  (not TOTAL FLOW VOLUMES)!!!
 
Special care should be taken in specifying tributary flow  rates when the AVERAGING PERIOD does not equal 1 year.
 
Suppose, for example, that the AVERAGING PERIOD is April thru September (=0.5 years) and that a gauged total inflow volume for a given tributary during this period is 40 hm3 (= million cubic meters). The value specified on the tributary input screen in this case should be 80 hm3/yr = ( 40 hm3 / .5 years)