Development of hydrological mathematical models for LID-SWM systems

Development of hydrological mathematical models for LID-SWM systemsmn (2008 – Present)

Stormwater runoff is one of the primary stressors in coastal and freshwater systems. Because conventional stormwater management (SWM) cannot consistently meet the new standards for water quality, the focus in SWM shifted from solely hydrologic and hydraulic concerns with basically sedimentation and dilution of pollutants, to mass flux removal. The new approach, Low Impact Development - Stormwater Management (LID-SWM) has the potential to successfully address both quality and quantity aspects of stormwater runoff. As in any other field, planners, engineers, and legislators who develop SWM strategies need accurate tools based on sound scientific research in order to make educated decisions. This project aims to develop tools for modeling and assessing the hydrological behavior of LID systems. These tools are necessary because at the moment, there is little available information about how design variables affect the hydraulic performance of the LID systems. Analytical models will be developed for four LID systems that are currently being studied at the UNHSC. The models will relate the hydrograph alteration by routing runoff through the LID system with for a spectrum of common design parameters currently in practice. The ability of LID systems to absorb extreme precipitation events due to climate change will also be explored. This data synthesis and development of modeling tools would fulfill the need of stormwater professionals to correctly assess, design, and site LID systems. This project is a joint effort to the Great Bay NERR’s coordinators to train and provide decision makers within the Great Bay watershed with verified, science-based tools and guidelines for decision making.