answers from Chicago on. Very tiny bugs coming up the drain that hop a little are probably springtales...I goggled tiny little bugs that hop when I first encountered them and that's what came up.
Detention basin. A detention basin or retarding basin is an excavated area installed on, or adjacent to, tributaries of rivers, streams, lakes or bays to protect against flooding and, in some cases, downstream erosion by storing water for a limited period of time.
A river basin is the area which is drained (gets water from) by a river or its tributaries. The Brahmaputra Basin, the Ganga Basin and the Sutlej Basins drain the Plains of Northern India. A delta is a triangular area of land formed by the deposits of soil at the mouth of a river.