We will not measure cleanliness of the water today since we will not be doing chemical testing, but you can see whether the water is clear and you will use your thermometer to measure the water temperature and compare it to the temperature in the school hatchery aquarium. Woods along the Banks. The forest is important to provide shade and also to hold the soil and prevent it from eroding excessively into the stream. Undesirable features Sand and sediment from erosion. Watch for this, particularly if there has been a lot of development along the stream.
Culverts are barriers to migration.
Salmon recognize culverts as foreign and will not go through a long one. Many of our urban streams have sizable lengths inside culverts. If you see litter, pick it up and put in one of the garbage bags. Pools and riffles. Direct the children to look into the pools.