cubic yards per year for the first 2,550 feet north of the breakwater. The 
incoming littoral drift supply must be providing the observed accretion since 
there are expected offshore losses of 3.18 cubic yards per year per foot of 
shoreline for the first 4,000 feet of shoreline north of the harbor, and 
material is apparently being accumulated in the dunes in Holland State Park. 
To summarize the present situation, it is believed that about 61,000 cubic 
yards of littoral material is being transported toward Holland Harbor from the 
north. The disposition of this material is summarized in Figure 26. About 
12,700 cubic yards per year is lost offshore (3.18 x 4,000), 6,600 cubic yards 
per year is accumulating on the beach face on the north side, and about 1,900 
cubic yards per year is being accumulated in the dunes of Holland State Park. 
Although the exact amount is unknown, an estimated 1,300 cubic yards per year 
of sand is lost inland. Hence, it is calculated that about 38,500 cubic yards 
per year of sand arrives at the harbor entrance but at the most 25,000 cubic 
yards is trapped. It is likely that some of the 25,000 cubic yards dredged in 
the harbor entrance comes from the south side; therefore, at least 13,500 cubic 
yards per year is lost offshore. Consequently, it is concluded that the harbor 
structures cause a loss of materials from the littoral region of at least 
13,500 cubic yards per year. In addition, the 25,000 cubic yards per year 
that is dredged is dumped offshore. The overall result is that the south side 
of the harbor is being starved of 61,000 cubic yards per year. 
3 
13,500 yd~ lost offshore 
a 
25, 000: 
deposited ins RagGoU> 
entronce 
channel 
yd 37 fos? offshore 
4 
Total 12,700 yas lost offshore 
ae wan 
Total 9,800 yd > to State Beach Park 
61,000 yd 2 
Incoming littoral delft 
ee 
Total 1,900 yd 3 to dunes 
Y 
HOLLAND STATE 
PARK 
3.18 yd 374 eroded from shoreline 
Wet bio taay 
3 
Total 1,300 yd to Inland 
4,000ft 
Figure 26. Summary of sand budget north of Holland, Michigan. 
b. South Side. Figures 27 and 28 provide information for an area measure- 
ment of shoreline accretion and erosion. The beach area changes are summarized 
in Table 4 by areas north and south of a section located 1,200 feet south of the 
south breakwater (an arbitrarily selected station which appears to correspond to 
a stationary shoreline point for the period 1856-1945). The table summarizes 
the corrections in lake level variation about an average offshore beach slope 
of 1 on 24.5 for the first 1,200 feet south, and an average beach slope of 1 
53 
