Waterbury, Conn.-based Haestad Press, a subsidiary of Haestad Methods, has launched an online version of its textbook “Advanced Water Distribution Modeling and Management.” Water resources professionals who are interested in learning basic theory and operational characteristics to model building and calibration can view the free e-book at www.haestad.com/AWDMOnline. The book also is available for purchase in a hard copy format from www.haestad.com/awdm or www.amazon.com. The hard copy comes with the company's WaterCAD water resources modeling software, documentation, interactive tutorials and training.