A fixed-bed model of Matagorda Bay was constructed to scale ratios of 1:1000 horizontally and 1:100 vertically as an aid in developing a sound engineering design of the project, including selection of the optimum channel location, design of protective works for the channel, and determination of changes in the hydraulic and salinity regimens that would occur as a result of natural and man-made changes. Several modifications of the basic plan were tested including various lengths of jetties and dikes, with and without assumed accretions; various alignments and side slopes of the entrance channel; and several arrangements of spoil disposal banks. Tests were also conducted to determine the effects on the hydraulic and salinity regimens of the bay of changes in prototype conditions brought about by hurricane and flood conditions, and of future enlargements of the project as may be required by navigation interests. (Author).