### Question
How is the "qualified hydrologic unit" defined?


### Answer
The term **qualified hydrologic unit** is defined in *30 U.S.C. § 1232* as follows -

> a hydrologic unit—


(i) in which the water quality has been significantly affected by acid mine drainage from coal mining practices in a manner which adversely impacts biological resources

#### Citation:
  - *30 U.S.C. § 1232*
  - Heading: **CHAPTER 25-SURFACE MINING CONTROL AND RECLAMATION > SUBCHAPTER IV-ABANDONED MINE RECLAMATIONS**

