Population: Table 30 and figure 62 

 show the past population growth in the 

 Columbia River Basin and in the Pacific 

 Northwest since I9OO. The basin population 

 can be expected to grow because of an in- 

 crease in the rate of births over deaths, 

 because of an increase in irrigated land 

 and because of inc recused industrial devel- 

 opment attracted by the abundance of water 

 and low cost electrical power. 



Figure 62 shows a predicted Columbia 

 River Basin population of about 5-1/2 mil- 

 lion persons by the year 2000 with 3.7 

 million of these residing in cities of over 

 1000 population that will contribute domes- 

 tic sewage to the basins streams. These 

 predicted populations (and they are nothing 

 more than an estimate) were deteimined by 

 averaging the rate of population growth 

 for the period I92O-I950 in the 3 catego- 

 ries shown on figure 62, i.e., the total 

 Pacific Northwest, the Columbia River Basin 

 and the basin cities over 1000 population 

 contributing sewage to the streams. This 

 average growth rate was then projected to 

 the yeeu- 2000 as shown on figure 62. 



Waste Characteristics: Table 3I 

 lists the assumed characteristics of domes- 

 tic and industrial wastes that are or will 

 be discharged in the Basin. Domestic sew- 

 age values shown are average ones ccmnonly 

 used in the field of sewage treatment. 

 Industrial waste oxygen consuming values 

 were averaged from studies of typical in- 

 dustries in the Columbia 8Uid Ohio River 

 Beisins (37)- Table 32 lists those indus- 

 tries, by location on the Columbia River 

 system, whose waste discharges might have 

 a deleterious effect on water quality. 



Domestic smd Industrial Pollution 

 Estimates: This study has concerned itself 

 only with the relationship of the waste 

 discharges to the dissolved oxygen content 

 of the Columbia River. Predictions on 

 other water quality changes are made in 

 subsequent chapters on this study. 



Table 3'*^ shows the data used to 

 arrive at the estimated dissolved oxygen 

 deficit in the Columbia River in the year 

 2000 as a result of domestic and industrial 

 waste discharges. Population increases 

 between I95O and 2000 were obtained by 

 using the growth rate shown in figure 62. 

 Industrial wastes are shown as population 

 equivalents, i.e., how many persons would 



Table 31.--Acsiimf'l characteristics of treated 

 liomestlc sewage and Industrial wastes 



I Do—»tlc 3— a« 

 Flow rata 



Tot^ SoUda 



3uT)WDd»4 Sollda 



DlMolnd SoUda 



PH 



AUallBltr 



ChlorldM 



5 daj ?0°C B.O.D, 



1 d«7 " 



2 <l«r " 



3 a.y • 



U tmr • 



6 <l«jr " 



7 (lay ■ 



8 (Uy " 

 lat Stags 20°C B.O.D. 

 ladngtrlal Waat«8 

 l^ood proceaalng planta 

 Palp and pap«r 

 lertlla 



PstrolaroB & Coal Prod. 

 1 PopolatloD eqnlvmlent 



100 gkU/cmfitm/iat 

 3SS P.P.K. 

 60 r.p.M. 



26$ P.P.N. 

 7.8 P. P.M. 



75 P.P.H. 



X P.P.H. 

 7 P.P.H. 



70 P.P.H. or O.OSa Iba. Oi 



22 

 38 

 Si 

 62 

 77 

 62 

 .87 

 103 



" 0.018 ■ 



■ 0.032 • 

 ' 0.01.3 " 



■ 0.052 " 



" 0.0611 " 



" 0.068 " 



■ 0.073 " 

 " 0.086 " 



li050 population •qniralent (arg. of 62 plasta) 

 373fOOO populaition oqnlvalaiit («*(. of 15 pluita) 

 5,270 - ■ ing. of 26 pUnta) 



lO.liOO • • inf. of 11 plant!) 



0.167 lia. 0.., 5 dara • 20^0 

 0,2li5 • • , lat Staga 



^Areraged frow rvforsncaa (36, 37 aiv] 38) 



produce a dcmestic sewage (untreated) 

 having the same oxygen consuming properties. 

 These population equivalents were doubled 

 in the 3 upper segments of the Columbia 

 River between 1950 and 2000. They were 

 kept stationary for the lower segment from 

 The Dalles to the mouth as it seems most 

 likely that the installation of recovery 

 and treatment processes in the pulp and 

 paper and in the food industries will so 

 reduce the strength of their wastes that 

 this will allow for increased industrial 

 development without causing an increase in 

 water pollutants. 



The critical period for dissolved 

 oxygen values should be in August and Sep- 

 tember. Low river flows for this period 

 are shown in tables 33 and 3''-- It can be 

 expected that these low flow values will 

 be Increased as more regulatory structures 

 are built on the river system. 



The total estimated biochemical 



93 



