Due to the small amount of information avaiable on planning and designing of tide gates and coastal drainage facilities, it is urgently required to have a guideline on them. From this reason, we described planning and designing of tide gates in the first of this paper. The contents of the first part are as follows:
　1　General
　2　Planning
　3　Calculation of Forces
　4　Design of a Gate Body
　5　Design of a Gate
　In the second part of this paper, we analyzed planning and design conditions of 109 tide gates (more than 3 meters in span) and 106 coastal drainage facilities in all ports of Japan, which were surveyed in October, 1977.