This book will provide you with the tools for designing drinking water systems and doing the calculations by hand. With minimal theory and through 28 progressive exercises, the most common scenarios are introduced one by one: branch lines, joining multiple sources, valley passes, pressure zones and even looped systems. You will learn how to decide on pipe diameters, check an existing design or plan a system enlargement, following simple, quick and reliable guidelines to achieve clear and tangible results for gravity flow water projects.