Code for Engineering Geophysical Exploration of Water Resources and Hydropower(SL326－2005) consists of 5 chapters , 35 sections and 3 annexes. This Code mainly includes:. Definition of terminologies, symbols and codes,. Clear identification of methods and categories used in geophysical methods and techniques, application conditions and instrument specifications for each method, and determination of technical requirements for field experiments, observation, arrangement of survey grids, parameter measurements, records and assessment, data processing and interpretation, reports and plots, etc.,. Determination of integrated applications of geophysical methods in 22 areas, clear identification of methods and techniques employed in each application area, and proposal of specific requirements for data interpretation and accuracy..