A detailed analysis of average daily flows and evaporation at the proposed project site indicates the potential for 2.5 – 10.1 cubic feet per second (cfs) to be lost to evaporation. Put in context, the historic average annual flow in Jackson is 4,187 cfs. This evaporation estimate does not include the increases in water levels that will occur as a result of rainfall in the project area becoming direct surface water as opposed to the current conditions where it falls upon soil and vegetation and is absorbed. Furthermore, approximately two-thirds of the Pearl River Watershed is runoff from south of the project location, so the Jackson area is not the only driver of water levels in the southern parts of the watershed. If rainfall and other downstream factors do not come into play, project engineers estimate that water flows could decrease by 0.06% at the Bogalusa gauge.
Will evaporation in the project area reduce water levels in the Pearl River south of the project area?
by Knol Aust | Jun 12, 2018