Dry weather flow in sewers

This publication reviews the dry weather flow information needs of designers, operators and modellers, and compares these with current practices for gathering information. This highlights three problems, seasonal differences in infiltration, attenuation of flows within the sewer system, and difficulties in measuring pollution loads that are influenced by sediment deposition and erosion. The book’s analysis of historic weather flow data assesses for the first time the effect of infiltration on quality parameters. It provides guidance on per capita contributions to domestic flows, diurnal variation, estimation of infiltration, and estimation of crude wastewater loads when aiming for 50% solids removal in primary sedimentation. Guidance is also given on data collection and definitions of dry weather flow appropriate for different applications. Invaluable information for all sewerage undertakers, wastewater treatment plant undertakers and water quality planners.