The approach taken for now is to provide all calculated sources and sink values. The user must decide how to account for any system-wide sediment imbalance. Using the system for CZM or regional project studies would require a sediment budget module such as the U.S. Army Corps of Engineer's Sediment Budget Analysis System. The discrepancy between existing and new WIS hindcast data needs to be addressed. The existing WIS data for Lake Michigan may not be accurate especially near the western shoreline for the period 1956-1987.
Discrepancies appear to exist in total wave energy and wave direction.
The data should be corrected and until then the discrepancies should at least be publicized. The FEPS procedure for bringing waves to nearshore breaking involves a number of simplifications. Most of these seem reasonable for this type of effort. Only height, period and direction are considered. Directional spectra are not too critical for representing waves approaching an open coast with smooth bathymetry.