Erosion and Sedimentation Control Measures
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Questions and Answers

What is the primary function of sediment traps in construction sites?

  • To increase stormwater run-off
  • To allow sediments from stormwater to settle (correct)
  • To enhance soil erosion
  • To transport sediments to other locations

    • How do sediment basins differ from sediment traps?

  • Sediment basins are used in residential areas only
  • Sediment basins are smaller in size
  • Sediment basins are solely for agricultural use
  • Sediment basins have a controlled water release structure (correct)

    • What process leads to the addition of solid particles to water bodies?

  • Erosion
  • Run-off
  • Sedimentation (correct)
  • Percolation

    • What is an earth dike constructed to do?

    <p>Divert run-off in a controlled direction</p> Signup and view all the answers

    Which of the following factors does NOT contribute to erosion on construction sites?

    <p>Increased vegetation</p> Signup and view all the answers

    What is the main purpose of site assessment before design?

    <p>To evaluate sustainable options</p> Signup and view all the answers

    What primarily characterizes stormwater run-off?

    <p>Water that flows out of the project site boundary</p> Signup and view all the answers

    Which of the following statements about erosion is true?

    <p>Erosion can occur due to steep slopes</p> Signup and view all the answers

    What is the primary benefit of using adaptive plants in landscaping?

    <p>They can survive without fertilizers, pesticides, or irrigation.</p> Signup and view all the answers

    Which of the following statements is true regarding invasive plants?

    <p>They should always be avoided for sustainable landscapes.</p> Signup and view all the answers

    What does the term 'building footprint' refer to?

    <p>The perimeter of the building plan only.</p> Signup and view all the answers

    What is included in the development footprint?

    <p>All structures and areas modified by the development.</p> Signup and view all the answers

    What is the heat island effect?

    <p>The temperature difference between urban and rural areas.</p> Signup and view all the answers

    What is the significance of rainwater management in urban development?

    <p>It reduces runoff volume and improves water quality.</p> Signup and view all the answers

    To qualify for credit calculations, what must a vegetated roof satisfy?

    <p>The criteria for development density and community connectivity.</p> Signup and view all the answers

    What is a primary goal of rainwater quantity control in development?

    <p>To replicate natural hydrology and balance.</p> Signup and view all the answers

    What does Solar Reflectance measure?

    <p>Ability to reflect solar radiation</p> Signup and view all the answers

    Which of the following statements correctly describes Solar Reflective Index (SRI)?

    <p>Higher SRI indicates better heat rejection</p> Signup and view all the answers

    What SRI value is associated with PVC White roofing material?

    <p>104</p> Signup and view all the answers

    To achieve a higher SRI value, which of the following must be true?

    <p>Both reflectance and emittance must be high</p> Signup and view all the answers

    What is the intent of Light Pollution Reduction in sustainable sites?

    <p>To improve night sky access and reduce energy costs</p> Signup and view all the answers

    Which material has the highest solar reflectance according to the data provided?

    <p>White coating, 2 coats, 2 mils</p> Signup and view all the answers

    What is a significant consequence of excess light pollution?

    <p>Harsh impacts on wildlife and people</p> Signup and view all the answers

    What is reflected in the SRI values provided for construction materials?

    <p>Reflectance and emittance values</p> Signup and view all the answers

    What is one primary benefit of conducting a site assessment prior to design?

    <p>It informs good design decisions based on site conditions.</p> Signup and view all the answers

    Which of the following factors is NOT typically assessed during a site evaluation?

    <p>Local architectural styles</p> Signup and view all the answers

    How can a thorough site assessment impact project costs?

    <p>By reducing risks and informing cost-saving strategies.</p> Signup and view all the answers

    Which aspect of climate is NOT typically evaluated in a site assessment?

    <p>Local wildlife population density</p> Signup and view all the answers

    What elements of vegetation should be mapped during a site assessment?

    <p>Invasive plant species and endangered species.</p> Signup and view all the answers

    Which of the following describes a liability identified in a site assessment?

    <p>Steep slopes and extreme climate patterns</p> Signup and view all the answers

    What type of topographical feature is essential to assess for slope stability risks?

    <p>Unique topographic features</p> Signup and view all the answers

    Which assessment strategy focuses on the management of water resources?

    <p>Hydrology</p> Signup and view all the answers

    What is a primary consequence of storm water mixing with sewage in treatment plants?

    <p>Overloading the sewage treatment plant</p> Signup and view all the answers

    Which of the following is a benefit of reducing storm water run-off?

    <p>Maintaining the natural aquifer recharge cycle</p> Signup and view all the answers

    What does eutrophication result from?

    <p>Accumulation of inorganic plant nutrients</p> Signup and view all the answers

    How can rainwater be effectively used according to sustainable strategies?

    <p>For irrigation and toilet flushing</p> Signup and view all the answers

    What defines an impervious surface?

    <p>It has less than 50% perviousness</p> Signup and view all the answers

    Which method is NOT suggested for reducing storm water run-off?

    <p>Increasing impervious surfaces</p> Signup and view all the answers

    What is one of the purposes of a rain garden?

    <p>To absorb rainwater run-off from urban areas</p> Signup and view all the answers

    Which aspect of storm water run-off can lead to environmental pollution?

    <p>Run-off from fertilized lands</p> Signup and view all the answers

    Study Notes

    Erosion and Sedimentation Control Measures

    • Silt Fence: Used on construction sites to prevent sediment from leaving the site.
    • Sediment Traps: Structures where stormwater sediments settle down.
    • Sediment Basins: Larger than traps, these ponds with controlled release allow for sediment settling from run-off.
    • Earth Dikes: Mounds of stabilized soil that redirect run-off to sediment traps and basins.

    Site Assessment

    • Purpose: Evaluates site conditions and informs sustainable design options.
    • Favorable conditions: Includes good climate, solar access, and healthy vegetation.
    • Liabilities: Comprises unhealthy soils, pollution sources, and extreme climate patterns.
    • Design Implications: Influences plant selection, building orientation for wind and solar advantages, and rainwater management.

    Key Site Assessment Strategies

    • Topography: Analyze slopes and contour mapping to assess stability risks.
    • Hydrology: Identify flood hazards, wetlands, and opportunities for rainwater collection.
    • Climate: Examine solar exposure and prevailing winds to inform design.
    • Vegetation: Survey primary plant types, significant trees, and presence of invasive species.

    Plant Considerations

    • Adaptive Plants: Non-native species adaptable to local conditions with low resource requirements.
    • Invasive Plants: Require high maintenance and should be avoided.
    • Native and Adaptive Plant Use: Recommended for sustainable landscaping.

    Development Footprint Terminology

    • Building Footprint: Area occupied by the building structure, excluding non-building areas.
    • Development Footprint: Includes all affected areas such as buildings, roads, parking, and other facilities.

    Heat Island Effect

    • Definition: The temperature difference between urban and rural areas, caused by increased impervious surfaces.
    • Impact: Results in elevated urban temperatures, impacting energy use and comfort.

    Rainwater Management

    • Intent: Aims to reduce stormwater run-off volume and improve water quality by mimicking natural hydrology.
    • Challenges: Combined stormwater and sewage systems can lead to overloaded treatment plants and increased energy usage.
    • Contaminants: Run-off from developed areas often carries pollutants impacting aquatic ecosystems.

    Strategies for Effective Rainwater Management

    • Reduce Impervious Areas: Opt for clustering developments to decrease paved surfaces.
    • Rainwater Harvesting: Collecting rainwater for irrigation and toilet flushing.
    • Pervious Materials: Implementing materials that allow water infiltration.
    • Green Infrastructure: Utilizing vegetated roofs, filter strips, bioswales, and retention ponds.

    Important Terminologies

    • Aquifer: Underground water-bearing rock from which water can be extracted.
    • Impervious Surface: Surfaces that promote stormwater run-off with less than 50% perviousness.
    • Rain Gardens: Designed to absorb rainwater run-off from impervious areas.

    Solar Reflectance and SRI

    • Solar Reflectance/Albedo: Measure of a surface's ability to reflect solar radiation.
    • Solar Reflective Index (SRI): Indicates materials' ability to minimize heat absorption; higher values indicate lower heat island effect potential.
    • Material Comparison: Various materials including Gray EPDM, PVC White, and White Coatings have significantly different SRI values.

    Light Pollution Reduction

    • Objective: To enhance nighttime sky visibility and reduce the adverse effects on wildlife and human activities.
    • Energy Efficiency: Excessive lighting leads to higher energy costs and environmental impacts.

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    Related Documents

    Chapter 4: Sustainable Sites PDF

    Description

    This quiz covers essential erosion and sedimentation control measures, including silt fences, sediment traps, and basins. Furthermore, it involves site assessment strategies focusing on topography and hydrology to ensure sustainable design practices. Learn about the implications of site conditions on design decisions.

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