In this section you will be introduced to the National EPA Stormwater Calculator and how to implement it to estimate stormwater runoff for a watershed area. No prerequisite knowledge is expected to complete this section.
You will complete one learning activity in this section of the course. You will use GIS to process data downloaded from the Multi-Resolution Land Characteristics Consortium (MRLC) land cover data and analyze land cover changes. In this section you will learn how to access web-based data sets that provide spatial and temporal information on land use and cover. The module is designed so that each section can be used independent of the others with a few minor modifications. This module has four main sections that can be accessed sequentially. The PCSWMM and EPA stormwater calculator will be used to evaluate the performance of LID. The EPA stormwater calculator will be introduced as a tool to estimate changes in stormwater runoff with changing land use. Students will be introduced to web-based databases that can be use to assess land cover changes as well as open source tools to evaluate mitigation for increased stormwater runoff as a result of urbanization. In this module, students will develop an understanding of the impacts of changing land use due to urbanization on stormwater runoff. Additionally, the water flows over construction sites, lawns, and road surfaces transporting pollutants such as sediment, oils, and nutrients that degrade water quality. Impervious areas do not infiltrate water into the soil which results in flooding. Stormwater runoff in urban areas occurs when rainfall or snowmelt flows over impervious surfaces such as roads, roof tops, and parking lots. One of the challenges of higher density populations is the stormwater that is generated in urban areas. This increasing urbanization poses challenges to provide safe, sustainable, and healthy housing, transportation, and energy systems. In 2018, a United Nations report estimated that 55% of the world's population lived in urban areas and that number would increase to 68% by 2050 (United Nations 2018, /en/news/population/ 2018-revision-of-world-urbanization-prospects.html). People all over the world have been moving from rural areas to urban areas in large numbers.
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