Respectively, Graduate Student and Associate Professor, Iowa Institute of Hydraulic Research, 404 HL, University of Iowa, Iowa City, Iowa 52242; and Professor, Department of Civil and Environmental Engineering, 1269C Engineering Hall, 1415 Engineering Drive, Madison, Wisconsin 53706 (E-Mail/Holman-Dodds: firstname.lastname@example.org).
EVALUATION OF HYDROLOGIC BENEFITS OF INFILTRATION BASED URBAN STORM WATER MANAGEMENT1
Version of Record online: 8 JUN 2007
JAWRA Journal of the American Water Resources Association
Volume 39, Issue 1, pages 205–215, February 2003
How to Cite
Holman-Dodds, J. K., Bradley, A. A. and Potter, K. W. (2003), EVALUATION OF HYDROLOGIC BENEFITS OF INFILTRATION BASED URBAN STORM WATER MANAGEMENT. JAWRA Journal of the American Water Resources Association, 39: 205–215. doi: 10.1111/j.1752-1688.2003.tb01572.x
Holman-Dobbs, Jennifer K., A. Allen Bradley, and Kenneth W. Potter, 2003. Evaluation of Hydrologic Benefits of Infiltration Based Urban Storm Water Management. J. of the American Water Resources Association (JAWRA) 39(1):205–215.
Paper No. 01193 of the Journal of the American Water Resources Association.Discussions are open until August 1, 2003.
- Issue online: 8 JUN 2007
- Version of Record online: 8 JUN 2007
- infiltration and soil moisture;
- low impact development;
- infiltration based storm water management;
- surface water hydrology;
- storm hydrograph;
- water budget
ABSTRACT: As watersheds are urbanized, their surfaces are made less pervious and more channelized, which reduces infiltration and speeds up the removal of excess runoff. Traditional storm water management seeks to remove runoff as quickly as possible, gathering excess runoff in detention basins for peak reduction where necessary. In contrast, more recently developed “low impact” alternatives manage rainfall where it falls, through a combination of enhancing infiltration properties of pervious areas and rerouting impervious runoff across pervious areas to allow an opportunity for infiltration. In this paper, we investigate the potential for reducing the hydrologic impacts of urbanization by using infiltration based, low impact storm water management. We describe a group of preliminary experiments using relatively simple engineering tools to compare three basic scenarios of development: an undeveloped landscape; a fully developed landscape using traditional, high impact storm water management; and a fully developed landscape using infiltration based, low impact design. Based on these experiments, it appears that by manipulating the layout of urbanized landscapes, it is possible to reduce impacts on hydrology relative to traditional, fully connected storm water systems. However, the amount of reduction in impact is sensitive to both rainfall event size and soil texture, with greatest reductions being possible for small, relatively frequent rainfall events and more pervious soil textures. Thus, low impact techniques appear to provide a valuable tool for reducing runoff for the events that see the greatest relative increases from urbanization: those generated by the small, relatively frequent rainfall events that are small enough to produce little or no runoff from pervious surfaces, but produce runoff from impervious areas. However, it is clear that there still needs to be measures in place for flood management for larger, more intense, and relatively rarer storm events, which are capable of producing significant runoff even for undeveloped basins.