VI-20 



Elsev/here, data may be collected for a sinole special purpose, 

 such as a Corps of Engineers project study or an FWPCA technical 

 assistance study. These usually result in a single report which 

 may or may not include all the data gathered during the study, and 

 which almost certainly would not be included in a nationwide 

 compilation. In the last instance, each datum must be pulled from 

 widely separated regional or district office files and arranged in a 

 uniform manner to be useful on a broad scale. 



A third large category of available data is that which is routinely 

 gathered but is not routinely published. Included here are water 

 pollution surveillance data, daily river flows, dredging statistics, 

 and many, many others. 



The routinely published information was, of course, the easiest to 

 obtain. The decentralized report files were somewhat more difficult 

 to acguire. Less significant because of the relatively small 

 volumes of information involved, but most difficult to acquire, were 

 the data from special surveys. In all cases, if required data are 

 not in published reports, it is extremely difficult to locate and 

 acquire then. 



Of the published pertinent information, virtually all has either 

 been included directly in the Inventory or has been summarized to 

 be included in some form. 



