Watershed Science Bulletin 2017-12-20T13:36:30+00:00

Watershed Science Bulletin

Published by: Center for Watershed Protection Association

Co-Editors-in-Chief: Neely Law (nll@cwp.org) and Karen Cappiella (kc@cwp.org)

Associate Editor: Lisa Fraley-McNeal (lfm@cwp.org)


Watershed Science Bulletin is an online, peer-reviewed journal featuring practical, science-based solutions to water resource problems. The Bulletin publishes research results on innovative ways that stormwater managers can respond to regulatory requirements (e.g., TMDLs), design stormwater practices, and set up and fund water resource programs. We also publish literature reviews, case studies and discussion papers on these and other pioneering watershed strategies. The Bulletin accepts article submissions on a rolling basis and our Editorial Committee of nationally-respected watershed and stormwater management professionals provides peer review.

The Bulletin is the first publication to directly serve the community of watershed management professionals. These busy professionals typically do not have access to academic research databases for the numerous disciplines that inform watershed and stormwater management. The journal’s mission is to synthesize both research and experience from these disciplines and readily transmit this valuable information to those who need it to protect and restore their watersheds. The information provided in the Bulletin is vital to the continuing education of watershed management professionals.

Current Issue

Calculating Stormwater Volume and Total Suspended Solids Reduction under Urban Tree Canopy in Wisconsin Using Available Research

December 2017


Current research has shown that urban trees can contribute significantly to stormwater volume control by retaining rainfall in the canopy of trees and increasing infiltration. The potential role of urban trees for stormwater design was evaluated at a proof-of-concept level for a planning study of part of the University of Wisconsin (UW)—Madison campus in 2016. There is currently no regulatory stormwater performance credit for trees in Wisconsin, and the effects of urban trees are not simulated by WinSLAMM or other common design models. The purpose of this project is to demonstrate a simple method of quantifying tree canopy rainfall interception and stormwater volume reduction based on data from published research, which was used to better inform a WinSLAMM model of the benefits of tree canopy cover over a parking lot. The model predicted that tree canopy coverage over a parking lot improved the bioretention performance for both runoff volume and total suspended solids (TSS) load reduction by 15% to 17%, depending on the design of the bioretention facility. Urban forest systems should be considered as one option for sustainable stormwater management, and this model demonstrates that tree canopy interception can have a substantial stormwater runoff reduction benefit.