396259 - LID implication for urban runoff management in response to climate change impacts
Tuesday, June 5
10:30 AM - 12:00 PM
Location: Mirage Room
Zahra Zahmatkesh, Canada – McMaster University; Reza Kerachian, Iran – University of Tehran; Zhenduo Zhu, Buffalo, NY – University at buffalo; Erfan Goharian, California – University of California, Davis
In urban areas, drainage systems for management of stormwater runoff are generally designed based on the historical hydrologic records. These records are assumed to be stationary; however, extensive studies have shown that climate change can impact and alter the patterns of hydrologic variables such as rainfall. In response to the modified rainfall, urban runoff quantity and quality management practices need to be improved to meet performance expectations following future climatic conditions. One potential solution to tackle changes imposed by climate change to manage and control runoff quality and quantity is the application of Low Impact Development (LID) practices. However, the quantitative effects of LIDs on both quality and quantity aspects of runoff management, to mitigate the adverse impacts of climate change, have not been studied sufficiently. In this study, a modeling framework is proposed to quantify the effect of LIDs on urban runoff management under climate change impacts. A watershed in northern part of Tehran, Iran, is selected as the study area to implement the suggested methodology. For the simulation of the watershed surface streamflow, Storm Water Management Model (SWMM) is utilized. To investigate how climate change can impact the future watershed runoff, rainfall projections by general circulation models (GCMs) are used. Change factor methodology is applied to downscale GCMs' outputs. Then, the effect of different types of LID practices on runoff quality and quantity is investigated. This paper is a part of the efforts to assess potential impacts of climate change on urban streamflow runoff with the objective of investigating the effect of LIDs as management practices to mitigate those impacts.
Keywords: Climate change, Urban runoff, Low Impact Development