Select your 100-meter segment based on areas with relatively low public usage, little evidence of debris from day use (picnic debris), and areas that are not immediately adjacent to an obstruction to nearshore circulation (e.g., breakwater, point of land). Also consider landmarks or permanent features to assist in returning to the same segment for future surveys.
The most important factor influencing site selection is your monitoring objective. For example, if you are interested in the debris deposited on the shoreline from a local river, consider selecting sites inside and outside of the area influenced by the river outflow to facilitate comparison. The site selection criteria listed in NOAA’s protocols should be used as a general guideline, met where possible, and assessed on a case-by-case basis.