Figure 31. The effects of withdrawal of water from an aquifer 

 (Source: Reference 88). 



(itfmfcr ifi hdtxc mrn 



before pumping 



'rf^liiiil Until siiifilic 



lUjiiifc M//f(/v citui umlcnaniihu !c</ ( liiw 



aquifer rechiti xc area 



ori)>imil vet tian 



wtiU't \an(i\ (iiut 



urnlet-ionipaiitil. 



n-afer-\aiuriiU'J 



law before pumfnn\< 



rrrff 



5**^* i/cilinc III prcwiin- U-vfl 



after pumping 



■ -^ »■ itt-ii>liuil land \urjiue 

 " l>n'\i'ni liitul suijiuc 

 ' lU'cltnc in iinv^htn Icwl {pu'znnh'liu level) 



'^ aquifer sands and clays 

 punii>ini: + /"essine dei line = Inailiin; = i /,n diwalei iiit; niul \i>liiiiie lediu lion = hitul sniface \iih\ideiue 



anginal arlesian level- 



ihs~ 



4.10 SEWAGE SYSTEMS - SUBPROJECT 10 



While the amount of sewage generated by an OCS facility in a densely 

 populated area would be an insignificant addition to the total, a large 

 labor-intensive facility in a rural coastal community could have a 

 significant impact if it does not construct a sewage plant. The increased 

 population from induced employment and the families of workers, as well 

 as the OCS facility, may place demands on local sewage systems. 



4.10.1 Summary 



Sewage is any waste material carried by sewers and may contain, in 

 addition to household domestic wastes, wastes from industries, institutions, 

 and commercial establishments and runoff from streets and highways. The 

 accumulation of these wastes presents a real threat to the coastal eco- 

 system if they are not properly collected, treated, and disposed of. 



Five major pollution problens caused by inadequately treated 

 human and industrial wastes in the effluents from coastal sewage 

 plants are (1) hazard to shellfish and human health, (2) aesthetic 

 offenses, (3) oxygen reduction of coastal waters from biological oxygen 



133 



