Joanne Drinan & Frank R. Spellman 
Stream Ecology and Self Purification [PDF ebook] 
An Introduction, Second Edition

This new edition of a very successful standard reference is expanded and fully reworked. The book explains and quantifies the processes whereby streams cleanse themselves, reducing their pollutant load as a natural process. Mechanisms of purification in running waters have always been critical with regard to clearly identified pollution sources. Th