Book excerpt: Aquifer storage and recovery (ASR) and other managed aquifer recharge (MAR) technologies are increasingly being used to meet peak demands, emergency supply (strategic storage), drought requirements, and a number of other storage needs. ASR and MAR system performance is highly dependent upon site-specific hydrogeological conditions and system design. This book provides an overview of ASR and MAR technologies that use wells to recharge aquifers. It addresses the key issues of project planning, aquifer characterization, well design, system operation, and source-water quality and pretreatment. The lessons learned from existing ASR systems are presented to provide guidance for successful future implementation of the technologies.This is the second book in a series, Methods in Water Resources Evaluation, published by Schlumberger Water Services. It is intended to be used as a design and reference text for water resources professional engineers, hydrogeologists, and water managers and as a university textbook.