Unit 7. Low Impact Development and Green Infrastructure
Summary
Unit 7 continues the use of the CME Building Case Study to explore water sustainability in the context of a building. The activity is extended to the catchment level, and a new tool for catchment level storm water management is introduced. Students are exposed in the pre-class assignments to low impact development (LID) and green infrastructure and the EPA National Stormwater Calculator. In class, the central activity is applying the EPA National Stormwater Calculator to evaluate an LID control plan for the CME building case study. The unit brings together concepts from previous units through the use of the calculator. The impact of landscapes, buildings, and other features on storm water runoff is illustrated. And the potential benefit of LID controls is analyzed. The homework assignment engages students in the search for a local green infrastructure site to take a picture and summarize the site in the context of a sustainable site.
Learning Goals
After completing Unit 7, students will be able to:
- Describe low-impact development storm water management controls
- Apply the EPA National Stormwater Calculator to determine storm water management benefits of low-impact development controls
Context for Use
Unit 7 extends the rainwater harvesting unit (Unit 6) to continue to explore solutions for water sustainability. The rainwater harvesting unit (Unit 6) focused on a building scale, while Unit 7 focuses on a catchment scale that includes the building from Unit 6. This unit is designed to considerably advance students' familiarity with low-impact development and green infrastructure. Students will need to have installed software, which presents numerous challenges for instructors. The computer expertise expected is beginner-level. Students should be able to access the Internet to use the National Stormwater Calculator, and navigate a users guide to learn the basic construct of the tool. Depending on instructor preference and student level, the students might be asked to perform greater pre-class activities to prepare to use the software in class. For most students in engineering and sciences, there will be sufficient familiarity with computer tools for analysis.
Description and Teaching Materials
Pre-Class Assignments
- Review the page for EPA's National Stormwater Calculator (The calculator does not require download and can be supported on mobile)
- Review Chapter 1 and 2 of National Stormwater Calculator Users Guide. Approximate reading and comprehension time is 30 minutes.
- Read about Green infrastructure and its benefits on the EPA site. Required reading and comprehension time is 10 minutes
- Watch two videos:
- NYC Green Infrastructure YouTube video, posted by NYC Water.
- EPA National Stormwater Calculator YouTube video, posted by EPA.
- Complete pre-class questions, see the Pre-Class Assignment handout (Microsoft Word 2007 (.docx) 23kB Aug26 24).
In-Class Activities
(15 min) Warm-up and Discussion
- Orient students to lesson and place in module
- Present lesson learning goals
- Review student responses to pre-class questions and discussion; are provided to aid the instructor.
(20 min) EPA National Stormwater Calculator Activity, Part 1: Setup Case Study
- See EPA NSC In-Class Activity handout (Microsoft Word 2007 (.docx) 42kB Aug26 24)
- Instructor uses EPA NSC In-Class Activity PowerPoint (PowerPoint 2007 (.pptx) 14.9MB Aug26 24)
- Instructor guides students through setup of site conditions for case study
- Students work individually on their own computers
(10 min) EPA National Stormwater Calculator Activity, Part 2: LID Controls
- Students continue with case study and explore LID control alternatives
- Students encouraged to work with rainwater harvesting, rain gardens, and pervious pavement
- Compute LID control benefits and compare with the baseline conditions
- Select final plan and record results
(15 min) EPA National Storwmater Calculator Activity, Part 3: Report
- Students prepare individual report
- Select results to report
(10 min) Mind Map Extension
- Review water system mind maps created previously
- Add or improve green infrastructure practices and other storm water management solutions
(5 min) Summary and Next Class
- Review lesson learning goals
- Next class " extreme events
- Assign Unit 7 homework (Microsoft Word 2007 (.docx) 22kB Jul4 16)
Teaching Notes and Tips
- The updated EPA NSC can be run off most internet browsers including on mobile. However, students should work on tablets or laptops as it is difficult to view all components of the app simultaneously on a mobile interface. All features have not been evaluated on mobile prior to creation of this assignment.
- The EPA software accesses the Internet to acquire data. Internet access is required.
- It is important to have additional help in the classroom to troubleshoot the software application as students work through the exercise. Teaching assistants and/or graduate students will be very helpful and should do the training before the class and have basic knowledge and experience with the software tool.
Assessment
Three assessment instruments are used in Unit 7:
- Pre-class questions are collected and reviewed to assess the first learning goal.
- Student submittals of case study application of EPA National Stormwater Calculator provides assessment of learning goal #2.
- Homework is used to assess learning goal #1.
References and Resources
- U.S. EPA. (2014) NATIONAL STORMWATER CALCULATOR WEB APP USER'S GUIDE – VERSION 3.4.0 , Publication No. EPA/600/C-22/150.
- EPA Green Infrastructure basics
- EPA Green Infrastructure benefits
- EPA Green Infrastructure landing page
- Cool video about pervious concrete from TechInsider
- Explanation of how green infrastructure contributes to sustainable communities is provided by the EPA in the following report: Enhancing Sustainable Communities with Creek Infrastructure