Unlike other texts that fail to explain the hydraulic processes that underlie in situ reactive zone treatments, Remediation Hydraulics provides a comprehensive discussion to help engineers to better understand these processes. This book addresses the complexities and heterogeneities of natural aquifers that are encountered in all treatment settings and introduces the concepts of pore-scale, fine-scale, and stratigraphic-scale heterogeneities. Based on the authors' experience in the design and analysis of hundreds of in situ groundwater treatment projects, this text presents fundamental and emerging theories that describe the behaviors of contaminants and injected fluids in aquifers.