Temporal water clarity
Temporal conditions can change quickly. Water clarity in rivers and streams varies based on the conditions present in their tributaries. When the snow pack melts and April showers come the creeks, streams, and small rivers contribute suspended load and dissolved load of eroded sediment into the now darkened water. The result is water that reduces light penetration.
Three factors listed below are temporal, which they relate to time situationally as these factors change from minute-to-minute or hour-to-hour. Usually current flow will not change from hour to hour, unless you are on the Mississippi River fishing below a lock and dam and the Corps of Engineers open or close the dams.