after construction. The optimum survey frequency is three repeat 

 surveys per year (early spring, mid-summer, and late fall) using standard 

 surveying techniques. The minimum desirable survey frequency is two 

 repeat surveys, in early spring and late fall. 



b. Supplemental Data. In monitoring the behavior of shore protec- 

 tion structures, the following supplemental data should be obtained: 



(1) Photography. Photograph the installation from two or more 

 permanent locations immediately after construction. Repeat the photo- 

 graphs with each condition survey. 



(2) Plans and Specifications. Obtain all available documents. 



(3) Materials. List types, quantities, and costs of structural 

 materials. 



(4) Labor. List type, quantities, and costs for labor. 



(5) Maintenance. Record the frequency, time, materials and 

 cost, and labor and costs required to effect repairs. 



(6) Ownership. Provide as much information as practicable 

 about ownership and responsibility for the structure. Sample forms for 

 obtaining and recording this supplemental data are given in Appendix B. 



c. Wave and Currents. The availability of statistical wave and 

 current data (Berg, 1969; Szuwalski, 1970; and Bruno and Hiipaka, 1973) 

 should be investigated with the local U.S. Army Engineer Districts 

 (Fig- 10)- Short-term water level rises associated with local storm 

 winds can affect the structure function and life. These vary from 

 locality to locality. Information on specific occurrences affecting 

 the monitored- structure should be obtained from the appropriate U.S. 

 Army Engineer Districts (Fig. 10) or the Lake Survey Center, National 

 Oceanic and Atmospheric Administration (NOAA) (Table 1). It should be 

 emphasized that an accurate record must be kept of dates of surveys, 

 photographs and other items relating to the surveillance program. 



In addition to surveillance of the functional behavior of a shore 

 protection structure, observation of the structural behavior of the 

 installation is also important. Shore protection structures require 

 varying degrees of maintenance depending upon structure type and degree 

 of exposure to wave action. Information on maintaining protective 

 structures is given in Table 2. The surveillance program should include 

 provisions for special inspections of the structure after storms in 

 addition to regular or periodic inspections. 



If failure of the structure occurs, all possible data should be 

 obtained on the type and time of failure, and the wave and water level 

 conditions to which it was subjected at the time of failure. 



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