Too many kids at one time in one area can be detrimental to the stream, but if you space them out distance-wise and timing-wise, you can minimize the impact. We recommend giving the stream a few weeks of a break between classrooms/groups. Each time you take a group out, stagger the stream sites by at least 50 feet or so. Try to have a controlled monitoring process (i.e., a few kids at a time take one net at a time, rather than a free-for-all with a bunch of nets at once). This is especially important if you’re going to be submitting the data to VA SOS. Have the kids put the rocks back where they were.