35 Ill. Adm. Code 364.304
High Quality Waters Factor
Section 364
Section 364.304 High Quality
Waters Factor
a) Certain segments, such as segments containing a major lake or
impoundment, have been identified as having high-quality waters where special
management and waste control procedures may be needed for their preservation.
b) It is recognized that certain free-flowing stream reaches also
have high water quality; however, these are not identified as needing special
preservation techniques due to the stringency of the state's effluent
standards. Lakes and impoundments do require special attention because the effluent
standards may not be sufficient to prevent degradation of water quality in
standing bodies of water. The segments selected under this criterion are
assigned a "high quality water factor" of 1.20. Segments immediately
tributary to these segments are given a factor of 1.10. All other segments are
given a factor of 1.00.