Retin-A (tretinoin) is a form of vitamin A that helps the skin renew itself. The Retin-A and Avita brands of tretinoin are used to treat acne. The Renova brand of tretinoin is used to reduce the appearance of fine wrinkles and mottled skin discoloration, and to make rough facial skin feel smoother. Retin-A may also be used for purposes not listed in this medication guide.
Waste Stream. The total flow of solid waste from homes, businesses, institutions, and manufacturing plants that is recycled, burned, or disposed of in landfills, or segments thereof such as the residential waste stream or the recyclable waste stream..
CONVENTIONAL CURRENT-METER METHOD. INTRODUCTION. Streamflow, or discharge, is defined as the volume rate of flow of. water, including any substances suspended or dissolved in the water. Discharge is usually expressed in cubic feet per second or cubic me-. ters per second. Discharge measurements are made at each gaging station to de-.