This manual provides a standard guide line for the estimation of floods in PNG. It is intended for general use in the planning and design of small and medium sized engineering works through out Papua new Guinea. The prupose of the manual and its use is to guide or help help engineers or resource planners in the planning and designing of brodges, culverts, drainage works, small dams and flood mitigation works. It is available for sale and is sold at the price of K200 per copy. If you or your organisation is interested to purchase a copy, please contct Mr. Walimu Apaka at Conservation Environment Protection Authority, P.O.Box 6601 Boroko NCD. email: email@example.com.