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*"Flash flooding" is less common, but can occur when extreme rainfall occurs throughout the watershed.
*"Flash flooding" is less common, but can occur when extreme rainfall occurs throughout the watershed.
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==Strategies==
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Effective flood mitigation strategies include both grey infrastructure (traditional engineered solutions) and green infrastructure (nature-based solutions).
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===Grey (traditional) Infrastructure Solutions===
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*Detention Ponds & Stormwater Basins: Store excess runoff and release it gradually.
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*Underground Stormwater Storage: Prevents sewer overflows.
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*Levees & Floodwalls: Protect against riverine and coastal flooding.
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===Green Infrastructure & LID Solutions===
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{|class="wikitable"
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|-
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!style="background: darkcyan; color: white"|LID Practice
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!style="background: darkcyan; color: white"|Flood Mitigation
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|
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![[Bioretention]]
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|Reduces peak stormwater flow and increases infiltration.|
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|-
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![[Permeable Pavement]]
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|Allows water to seep into the ground, reducing runoff.|
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|-
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![[Green Roofs]]
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|Absorb rainfall and delays runoff into drainage systems.|
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|-
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![[Riparian Buffers]]
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|Protects streambanks and reduces erosion.|
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|-
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![[Constructed Wetlands]]
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|Retains and filters stormwater while providing habitat.|
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===Hybrid Approaches===
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Combining green and grey infrastructure enhances flood resilience. Examples include:
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* Stormwater tunnels + LID: Large-scale storage integrated with distributed bioretention.
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* Green streets with subsurface storage: Maximises infiltration while providing underground detention.
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