; and (2) by redesignating subsections (d) and (e) as subsections (c) and (d), respectively. 606. Stream protection (a) Addition of stream buffer Title V of the Surface Mining Control and Reclamation Act of 1977 ( 30 U.S.C. 1251 et seq.) is amended by adding at the end the following: 530. Limitations on surface or underground coal mining activity (a) In general Surface or underground coal mining operations shall not be conducted if— (1) such activity would disturb the surface of land within 100 feet of a perennial or intermittent stream, unless the Secretary has authorized such activity to be conducted based on a finding that such disturbance— (A) will not cause or contribute to the violation of applicable State or Federal water quality standards; and (B) will not adversely affect the water quantity, water quality, or other environmental resources of the stream or downstream waters; or (2) the Secretary determines that such activity will— (A) cause or contribute to the violation of applicable State or Federal water quality standards; or (B) adversely affect the water quantity or quality or other environmental resources of the stream. (b) Measurement of distance The 100-foot distance referred to in subsection (a)(1) shall be measured horizontally on a line perpendicular to the stream, beginning at the ordinary high water mark. (c) Definition of perennial or intermittent stream In this section, the term perennial or intermittent stream means a stream or part of a stream that— (1) has flowing water during periods when groundwater provides water for streamflow, but may not have flowing water during other periods