### Question
Can you define what blowdown means?


### Answer
**Blowdown** is defined as the following in *40 CFR § 401.11*:

> the minimum discharge of recirculating water for the purpose of discharging materials contained in the water, the further buildup of which would cause concentration in amounts exceeding limits established by best engineering practice.

#### Citation:
  - *40 CFR § 401.11*
  - Heading: **Title 40—Protection of Environment > PART 401—GENERAL PROVISIONS > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY—(Continued)**

