Development of Methods to Determine Lateral Effect of Highway Drainage Systems on Wetland Hydrology - Phase 2:Final rept. (July 2004 - June 2006)

摘要

A method was developed in the first phase of this project to predict the lateral effect of a drainage ditch on adjacent wetland hydrology. The method predicts the distance of influence of a single ditch constructed through a wetland, i.e. the width of a strip adjacent to the ditch that is drained such that it would no longer satisfy wetland hydrologic criteria, in terms of T25 values which are dependent on climatological conditions. Main objectives of the second phase were to complete determination of the T25values and to test the validity of the method.