Environmental engineers continue to rely on the leading resource in the field on the principles and practice of water resources engineering. The second edition now provides them with the most up-to-date information along with a remarkable r ange and depth of coverage. Two new chapters have been added that explore water resources sustainability and water resources management for sustainability. New and updated graphics have also been integrated throughout the chapters to reinfo rce important concepts. Additional end-of-chapter questions have been added as w ell to build understanding. Environmental engineers will refer to this text thro ughout their careers.