New U.S. Forest Service research introduces a modeling tool that can be calibrated to match observed runoff or an entire watershed. The model is used to estimate how land cover changes will affect runoff timing and magnitude, allowing for more informed watershed restoration planning, urban planning and targeted placement of green infrastructure.
Urban ecosystem restoration now involves slowing down urban runoff to restore local hydrology with green infrastructure, which can be installed as single parcels along runoff flow paths; green infrastructure essentially increases the surface roughness, delaying the speed of runoff compared with relatively smooth impervious surfaces. by Yang Yang, Theodore A. Endreny, and David J. Nowak on the Alliance for Community Trees.
Original article: “Simulating the effect of flow path roughness to examine how green infrastructure restores urban runoff timing and magnitude,” Yang, Yang; Endreny, Theodore A.; Nowak, David J., Urban Forestry & Urban Greening 14(2): 361-367. (2015) http://www.treesearch.fs.fed.us/pubs/49283