Among all the phases of the hydrological cycle, overland flow and surface runoff have the most intimate interaction with human beings as they co-exist in space and time. This book contains eleven chapters covering a wide range of topics on overland flow and surface runoff, which are of value of researchers and practicing engineers. The chapters are (1) Scale invariance and self-similarity in kinematic overland flow in space and time, (2) Recent development in studies of overland flow resistance, (3) Kinematic wave for overland flow, (4) Overland flow and the runon process, (5) Hillslope runoff and soil erosion processes, (6) Efficiency of overland and erosion mitigation techniques at Ribeira Seca, Santiago Island, Cape Verde, (7) Simulate overland flow using coupled surface-subsurface models, (8) Overland flow, surface flow and surface/ground water interactions, (9) Interpretation of overland flow associated with infiltration devices placed in boulder clay and construction fill, (10) Review of hydrologic processes and the transport of pollutants operated by stormwater runoff in the urban environment, and (11) Ammonia oxidation and the corresponding bacterial communities in two overland flow areas treating landfill leachate or wastewater.