Comparison of Runoff Data to Assess Impact of Stormwater Green Infrastructure

Neha Gupta and Thomas Meixner

Department of Hydrology and Atmospheric Sciences

The University of Arizona

To address impacts of stormwater on water quality and quantity, urban areas have developed policies and approaches to increase stormwater capture for use and/or infiltration (Miles and Band, 2015). Infrastructure used to promote on-site retention of stormwater for infiltration, harvesting, and/or evapotranspiration is referred to as green infrastructure, or more specifically, stormwater green infrastructure (SGI, e.g. Jaffe et al., 2010, Pennino et al., 2016). In arid and semi-arid environments such as the southwestern United States, SGI is implemented to address issues related to water retention, groundwater recharge, urban heat island effects, and nuisance flooding as a result of intense rainfall. Taking advantage of the City of Tucson as a living laboratory, the impact of SGI on stormwater runoff is investigated. Stormwater infrastructure in Tucson is dominated by drainage from roadways to ephemeral stream channels. In order to assess the affect of SGI on hydrological processes, runoff stage data is being collected in two urban, ephemeral washes, both upstream and downstream of SGI installation. This poster discusses methods and preliminary results of assessing variability in runoff volumes and hydrographs of these washes attributed to contributing area, contributing land use cover, and contributing area SGI installation.