Boundaries are the apparent shorelines and the boundaries of other more clearly delineated aquatic zones. On lakes formed at the mouth of tributary streams, the upstream boundary is the boundary of the study area. Scour channel lakes are formed by the scouring of point bar swales during high flows. Scour channel lakes are generally small and crescent-shaped. Most of these aquatic areas are isolated.
Boundaries are the apparent shorelines.
Where contiguous, the connecting boundary is a line across the downstream limit of the apparent shorelines. Most of these lakes are larger than 100 ha. Boundaries are the apparent shorelines. Where contiguous, the connecting boundary is a line across the limits of the apparent shorelines. Borrow pits are water bodies formed where material was excavated for levee or dike construction.