A sediment budget was constructed for the Oceanside, California, area to predict the effect on adjacent beaches of each two alternative solutions--groins and nearshore breakwater--to the Oceanside erosion problem. The pre-project sediment budget was modified and assumptions made about the performance of each proposed project. The report discussed briefly each of the sources fo data used in the budget, sets up the sediment balance equations, solves the equations under several sets of assumptions for conditions prevailing in the 1950-1972 time period, and then uses this pre-project sediment budget to evaluate the possible effects of the groin field and nearshore breakwater projects on adjacent beaches.