Friday, November 10, 2023

🌿🌧️ Detailed Overview of LID Controls with Emojis

 πŸŒΏπŸŒ§️ Detailed Overview of LID Controls with Emojis

Low Impact Development (LID) Controls are innovative practices designed to manage surface runoff in an eco-friendly way. They aim to handle runoff through detention, infiltration, and evapotranspiration, much like Aquifers and Snow Packs. Here’s a detailed look at the various types of LID controls modeled in SWMM:

  1. StreetPlanter πŸŒ³πŸ›£️:

    • Nature: Depression areas with vegetation in engineered soil above a gravel drainage bed.
    • Function: Stores, infiltrates, and evaporates direct rainfall and runoff from surrounding areas.
  2. RainGarden 🌼🌧️:

    • Type: A variant of bio-retention cells, composed solely of an engineered soil layer, sans gravel bed.
    • Purpose: Simplified bio-retention for rainwater.
  3. GreenRoof 🏠🌿:

    • Design: Soil layer on a drainage mat on roofs.
    • Benefit: Manages rainfall percolation and runoff on roof structures.
  4. InfilTrench πŸ•³️πŸ’§:

    • Structure: Narrow ditches filled with gravel.
    • Role: Intercepts runoff, providing storage and time for soil infiltration.
  5. PermeablePavement πŸš—πŸŒ³:

    • Continuous System: Gravel-filled excavated areas with porous overlay.
    • Block Paver System: Impervious blocks on a gravel bed.
    • Advantage: Reduces surface runoff, promotes infiltration.
  6. Cistern πŸ›’️🌦️:

    • Utility: Containers for collecting roof runoff.
    • Usage: Stores rainwater for later use or release.
  7. Downspout 🏠🌧️:

    • Approach: Redirects roof downspouts to pervious areas instead of storm drains.
    • Effect: Encourages ground infiltration, reducing direct stormwater discharge.
  8. VegSwale 🌾🌊:

    • Formation: Vegetated, sloped channels.
    • Impact: Slows runoff conveyance, enhances soil infiltration.

Additional Features and Considerations:

  • Drain Systems Optional πŸ”„: Bio-retention cells, infiltration trenches, and permeable pavements may include drains in their gravel beds to manage excess runoff.
  • Impermeable Floors/Liners πŸš«πŸ’§: Prevent infiltration into native soil, ideal for specific site conditions.
  • Clogging and Conductivity 🚧: Infiltration trenches and permeable pavements may experience reduced conductivity over time.
  • Pollutant Removal πŸ’§πŸ§ͺ: LID units with drains can be assigned removal percentages for pollutants.
  • Runoff and Pollutant Reduction 🌍🌟: LIDs reduce both the volume of runoff and the mass load of pollutants due to decreased flow volume.

These LID controls represent a step forward in sustainable urban planning, offering a blend of ecological preservation and urban development. By implementing these systems, urban areas can significantly reduce their environmental footprint and contribute to a healthier, greener future. πŸŒ³πŸ™️🌍

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