This publication provides an introduction to the planning and design of activated sludge wastewater treatment plants. Here is what is discussed: 1. INTRODUCTION, 2. ACTIVATED SLUDGE PROCESSES, 3. CLOSED-LOOP REACTOR DESIGN CRITERIA, 4. EXAMPLE CALCULATIONS, 5. REFERENCES, 6. BIBLIOGRAPHY

is publication covers the analysis of stress conditions at a point, stresses beneath structures and embankments, and empirical methods for estimating loads on buried pipes, conduits, shafts, and tunnels.

This publication provides an introduction to the hydraulic design of culverts.