The book covers the new syllabus of the semester scheme for the first year in R.T.U. and other universities. It encompasses the practical applications of the subject, that is the real need of the hour and also discusses the major environmental problems we face today. It contains authentic information provided by the different Manuals prepared by The C.P.H.E.E.O. It includes examples of different projects and schemes for illustration. Simple sketches and easier derivations of the mathematical formulations have been adopted. Review questions at the end of each chapter are given to test the understanding of the reader. The practical problems of field and fundamental solutions have been correlated by the vast experience and deep sense of concern to the mother earth.