--- title: "Low Impact Development (LID) | Intro Env Sci" description: "Low Impact Development (LID) uses green roofs, permeable pavement, and rain gardens to reduce stormwater runoff and protect water quality in Intro to Environmental Science." canonical: "https://fiveable.me/introduction-environmental-science/key-terms/low-impact-development-lid" type: "key-term" subject: "Intro to Environmental Science" unit: "Unit 7" --- # Low Impact Development (LID) | Intro Env Sci ## Definition Low Impact Development (LID) is a stormwater strategy that uses natural features and porous surfaces to slow runoff, increase infiltration, and reduce pollution. In Intro to Environmental Science, it shows how urban planning can protect water systems. ## What It Is Low Impact Development, or LID, is a way of designing land so rainwater behaves more like it would in a natural landscape. In Intro to Environmental Science, that means reducing fast, dirty runoff from parking lots, roofs, and roads by letting water soak in, spread out, and get filtered before it reaches streams or storm drains. LID focuses on managing water where it falls instead of collecting everything in large pipes and basins. Common LID features include rain gardens, green roofs, permeable pavement, vegetated swales, and small infiltration areas. These features slow water down, which gives soil and plant roots time to absorb some of it and trap pollutants like oil, sediment, and excess nutrients. The goal is not just less flooding, but a healthier water cycle in developed areas. When less rain rushes across hard surfaces, there is usually less erosion, less pressure on storm sewers, and more groundwater recharge. That matters because groundwater can feed streams later, especially during dry periods, and it helps keep local water systems more stable. LID is called a low impact approach because it tries to limit how much development changes the land’s natural hydrology. A new subdivision or shopping center often adds lots of impermeable surface, which increases runoff volume and speed. LID lowers that impact by spreading small solutions throughout a site instead of relying only on one big drainage system. A simple example is a school parking lot built with permeable pavement and a rain garden near the curb. Instead of sending every storm to the nearest drain, some water passes through the pavement, some gets collected in the planted area, and some filters into the soil. That makes the site work more like part of the watershed instead of a runoff machine. ## Why It Matters LID shows up in Intro to Environmental Science because it connects land use with water quality, flooding, and ecosystem health. It is one of the clearest examples of how a human design choice can change a natural process like infiltration and runoff. This term also helps you explain why urban areas often pollute waterways even when no factory is dumping waste into them. Rain picks up oil, trash, fertilizers, and metals as it flows over pavement, so the problem starts with the shape of the landscape itself. LID reduces that source of pollution before water reaches a stream, wetland, or lake. The concept also fits broader course ideas like sustainability and watershed management. Instead of treating stormwater as waste, LID treats it as a resource that can recharge groundwater and support local ecosystems. That makes it a strong example of prevention, which is usually cheaper and cleaner than fixing water problems after they spread. If you are writing about environmental solutions, LID gives you a concrete case where engineering, ecology, and urban planning overlap. It is easy to describe in a short answer, but it can also support deeper analysis of tradeoffs, cost, and land use decisions. ## Connections ### [Stormwater Management](/introduction-environmental-science/key-terms/stormwater-management) LID is one approach within stormwater management. Stormwater management is the broader topic of controlling rain runoff from developed land, while LID specifically tries to copy natural drainage and reduce runoff at the source. If a question asks how a city handles heavy rain, LID is one of the strategies you can name. ### Permeable Pavement Permeable pavement is one of the most common LID tools. Instead of shedding all water to drains, it lets rain pass through the surface and into a gravel or soil layer below. That makes it a good example when you need to show exactly how LID reduces runoff on roads, walkways, or parking lots. ### Green Infrastructure Green infrastructure is the larger category that includes LID. It uses plants, soil, and natural processes to manage water and improve environmental conditions in cities. LID features like green roofs and rain gardens are green infrastructure because they provide drainage control while also adding ecological benefits. ### [Watershed Management](/introduction-environmental-science/key-terms/watershed-management) LID makes more sense when you think in watershed terms, because runoff from one property can affect water downstream. Watershed management looks at the whole drainage area, not just one building site. LID helps because it reduces pollution and peak runoff before water leaves a neighborhood and enters the wider watershed. ## On the AP Exam A quiz question might show a photo of a rain garden, green roof, or permeable sidewalk and ask you to identify the LID feature and explain what it does. In a short answer or essay, you may need to trace the path of stormwater from a street to a stream and describe how LID changes that path. You might also compare LID with traditional stormwater infrastructure, such as large pipes or detention basins. The best answers usually mention infiltration, runoff reduction, pollutant filtration, and groundwater recharge. If the prompt gives a city planning scenario, use LID as the solution that lowers flood risk while improving water quality. ## Low Impact Development (LID) vs Stormwater Management Stormwater management is the broad category, and Low Impact Development is one strategy inside it. Stormwater management can include pipes, detention basins, and drainage systems, while LID emphasizes porous surfaces, vegetation, and small-scale site design that lets water soak in. If you are choosing between the two, think broad method versus specific approach. ## Key Takeaways - Low Impact Development is a stormwater strategy that tries to copy natural water movement in developed areas. - LID reduces runoff by increasing infiltration, slowing water flow, and filtering pollutants through soil and plants. - Common LID tools include rain gardens, green roofs, and permeable pavement. - The term matters in Intro to Environmental Science because it links urban land use to watershed health, flooding, and water quality. - A good way to remember it is that LID manages rain where it falls instead of sending it away as quickly as possible. ## FAQs ### What is Low Impact Development (LID) in Intro to Environmental Science? Low Impact Development is a land-use and stormwater approach that reduces runoff by mimicking natural drainage. In Intro to Environmental Science, it is used to show how cities and buildings can be designed to protect water quality instead of overwhelming storm drains and streams. ### How does Low Impact Development reduce pollution? LID slows rainwater down and lets it pass through soil and vegetation, which can trap sediment and filter out some pollutants. That matters because runoff from roads and rooftops often carries oil, metals, fertilizer, and trash into waterways. ### Is Low Impact Development the same as permeable pavement? No. Permeable pavement is one LID tool, not the whole strategy. LID includes multiple features, such as rain gardens, green roofs, and vegetated swales, all aimed at reducing runoff and improving infiltration. ### Why would a class connect LID to watersheds? Because runoff from one site does not stay there. Water that moves off a parking lot or roof can enter a storm drain, stream, wetland, or lake downstream, so LID is really a watershed solution, not just a building design choice. ## Related Study Guides - [7.4 Water Treatment and Management](/introduction-environmental-science/unit-7/water-treatment-management/study-guide/PXE7mE0p3uyO6vJE) ## About This Document Canonical Fiveable pages are available as Markdown at the same path plus `.md`. - [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns - [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing - [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`) - [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`) ## Structured Data ```json {"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/introduction-environmental-science/key-terms/low-impact-development-lid#resource","name":"Low Impact Development (LID) | Intro Env Sci","url":"https://fiveable.me/introduction-environmental-science/key-terms/low-impact-development-lid","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/introduction-environmental-science/key-terms/low-impact-development-lid#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-07-03T02:22:45.908Z","isPartOf":{"@type":"Collection","name":"Intro to Environmental Science Key Terms","url":"https://fiveable.me/introduction-environmental-science/key-terms"},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/introduction-environmental-science/key-terms/low-impact-development-lid#term","name":"Low Impact Development (LID)","description":"Low Impact Development (LID) is a stormwater strategy that uses natural features and porous surfaces to slow runoff, increase infiltration, and reduce pollution. 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