modification to this cross section is required for Jetties 

 oriented straight into oncoming waves or breakwaters with 

 monolithic superstructures. 



4. The program BWCOMP uses the above assumptions to make cost compari- 

 sons of alternate armor material and slope combinations with accuracy appro- 

 priate for the earliest stages of planning or for Step 4 of the optimization 

 procedure proposed in the main text. Final design should involve all the de- 

 tailed considerations recommended in the Shore Protection Manual (SPM) (1984)* 

 and other guidance available. 



Program Input 



5. The program is fully interactive in its present form and accommo- 

 dates either English or metric units. It is written in FORTRAN as implemented 

 on the US Army Engineer Waterways Experiment Station (WES) Honeywell DPS-8 

 mainframe computer system. A BASIC version is also available for use on mi- 

 crocomputers. The interactive input required is demonstrated by the example 

 interactive session included in this appendix. The associated output is shown 

 (in part) in the example output included in this appendix. Two wave condi- 

 tions must be specified: one for determining armor size and the other for 

 determining crest elevation as a function of a specified maximum transmitted 

 wave height. A percentage exceedance must be associated with the specified 

 maximum transmitted height such that x^ of the transmitted waves can exceed 

 the maximum height during the sea state represented by the second specified 

 wave condition. The input unit prices (cost per volume) should be average 

 values for the materials (rock or concrete) and armor unit types. This is a 

 comparative analysis, so fine precision in these estimates is not necessary, 

 but consistency is important. Prices that vary with the weight or volume of 

 the individual armor units may require successive runs of BWCOMP since an 

 estimate of these individual unit weights is necessary to input the appropri- 

 ate unit price. 



* References cited in this appendix are included in the References at the end 

 of the main text. 



B2 



