### Question
What is the definition of qualified hydrologic unit?


### Answer
The definition of **qualified hydrologic unit** is as follows in *30 U.S.C. § 1232*:

> a hydrologic unit—


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

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

