### Question
Can you define what qualified hydrologic unit means?


### Answer
**Qualified hydrologic unit** is defined as the following 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 which adversely impacts biological resources

#### Citation:
  - *30 U.S.C. § 1232*
  - Heading: **CHAPTER 24-GEOTHERMAL ENERGY RESEARCH, DEVELOPMENT, AND DEMONSTRATION > SUBCHAPTER IV-ABANDONED MINE RECLAMATIONS**

