Watermaths explains the mathematics underpinning the design and operation of technologies used for purifying water and wastewater. It is written with both undergraduates and practitioners in mind. Designed for those new to the water sector - and assuming only a very basic grounding in science or engineering - this book aims to equip readers with the skills to tackle the most important maths calculations demanded in this area. The direct and succinct delivery is designed to get you up to speed as quickly as possible, providing tuition in basic numeracy, chemistry, process engineering and fluid physics. Watermaths covers the following core disciplines: i) manipulation of equations, including logarithmic and exponential expressions ii) fluid physics for describing flow through pipes, channels and filters iii) chemical concentrations and reactions for defining chemical dosing iv) chemical and biochemical kinetics for assessing the impact of speed of reactions v) mass balance for determining fate of materials through unit processes vi) mass transfer for movement of materials across boundaries within processes vii) reactor theory for designing biochemical and chemical reaction vessels. Each chapter gives example math calculations, followed by exercises with solutions. Exercises range in difficulty from simple single calculational-step problems to more complex examples, supplemented by an over-arching design problem. This new edition incorporates feedback from the first edition, making Watermaths the perfect companion to those studying disciplines relating to water chemistry, hydraulics, environmental engineering and civil engineering. Wastewater maths, waste water maths, water maths, maths for wastewater treatment, water and wastewater calculations.