Building With Nature, Not Against It
- Audree Grubesic
- 1 hour ago
- 4 min read
Understanding Flooding, Trees, and Water Management in Modern Development. Part 1 of 3 of this High Performance Series with Mark Wille and Featuring Tracy Fanara
When we talk about high-performance building, we often focus on materials, systems, and structural innovation. But one of the most critical forces impacting our built environment isn’t manufactured at all — it’s nature.
In this High Performance Builds conversation, industry professionals sit down with Dr. Tracy to unpack how earth systems, land development, and water management intersect — and why understanding this relationship is essential for the future of construction.
Mother Nature Sets the Rules
One of the most powerful takeaways from the discussion is simple:
Nature doesn’t adapt to our buildings — our buildings must adapt to nature.
Weather patterns, groundwater movement, and environmental systems operate on their own terms. When construction and development ignore those systems, the consequences show up quickly — often in the form of flooding, structural damage, and environmental degradation.
Recent years have seen record flooding events across regions not historically prone to them, including Texas, Washington, and California. Entire neighborhoods have been inundated, with sediment levels reaching several feet in some areas.
These aren’t isolated incidents — they’re signals of larger system imbalances.
The Overlooked Role of Trees
One of the most underestimated components of flood prevention is also one of the most natural: trees.
Trees play a critical role in water absorption and ecosystem balance. Through capillary action, they pull water from the ground, regulate soil moisture, and stabilize land through extensive root systems.
Think of trees as vertical drainage systems — constantly drawing water upward and redistributing it into the atmosphere.
When trees are removed through land clearing or development, that natural absorption system disappears. The result?
• Faster soil saturation
• Increased runoff
• Higher flood risk
• Reduced soil stability
In many developments, tree removal isn’t fully accounted for in water balance modeling — a gap that has historically contributed to drainage and flooding issues.
Impervious Surfaces & Runoff
Modern development replaces natural ground cover with impervious surfaces like asphalt and concrete.
Previously, rainwater would infiltrate soil, grass, and root systems. But once paved, that same water is forced to move across surfaces instead of through them.
This creates:
• Increased runoff volume
• Faster water flow
• Lower water quality
• Greater erosion
• Flash flooding risks
Water that once nourished ecosystems is now redirected into drainage systems, rivers, and ultimately oceans — often carrying pollutants along the way.
Building Higher Comes With Tradeoffs
In coastal regions especially, new building codes often require elevated construction to mitigate flood risk.
But raising site elevation introduces another challenge: sediment fill.
When fill is brought in to raise land levels, existing trees often cannot survive the change in soil depth and oxygen availability. In many cases, developers opt to clear-cut entirely for efficiency.
While elevation may protect structures, it simultaneously removes natural flood defenses — creating a complex environmental tradeoff.
Bioswales: Simple Concept, Powerful Impact
One solution discussed in the conversation is the use of bioswales — engineered drainage systems designed to slow, store, and filter stormwater runoff.
Though the term sounds technical, the concept is straightforward: enhanced drainage ditches designed for sustainability.
Bioswales are typically lined with:
• Vegetation
• Soil layers
• Gravel systems
Their purpose is to:
• Slow water flow
• Allow infiltration into the ground
• Filter pollutants
• Reduce peak runoff volume
• Provide temporary water storage
By reducing the speed and intensity of runoff, bioswales help prevent flash flooding while improving downstream water quality.
Watersheds & Downstream Impact
Water doesn’t stop at the jobsite.
Runoff from developments flows into storm systems, rivers, and major watersheds. For example, much of the central United States drains through the Mississippi River into the Gulf of Mexico — contributing to one of the largest oceanic “dead zones” in the world.
Pollutants carried by runoff — oils, chemicals, debris — accumulate downstream, affecting ecosystems far beyond the original development site.
This reinforces the importance of localized water management solutions that reduce environmental impact at the source.
Building Smarter for the Future
High-performance construction isn’t just about energy efficiency or structural innovation — it’s about environmental alignment.
As development continues to expand, integrating natural systems into planning and design becomes critical.
Key considerations moving forward include:
• Preserving tree canopies where possible
• Designing with permeable surfaces
• Incorporating bioswales and infiltration systems
• Accounting for vegetation loss in water modeling• Prioritizing low-impact development strategies
By building with nature instead of against it, the industry can create structures that are not only resilient — but sustainable long-term.
FAQs
Why are trees so important in flood prevention?
Trees act as natural water management systems. Through their root networks and capillary action, they absorb groundwater, stabilize soil, and regulate moisture levels. When trees are removed during development, the land loses a major absorption mechanism, leading to faster soil saturation, increased runoff, and higher flood risk.
What is a bioswale and why is it used in construction?
A bioswale is an engineered drainage system designed to slow, store, and filter stormwater runoff. Unlike traditional drainage pipes that move water quickly off-site, bioswales use vegetation, soil, and gravel layers to allow water to infiltrate naturally. This reduces flooding risk, improves water quality, and lowers peak runoff volume after heavy rainfall.
How do impervious surfaces contribute to flooding?
Impervious surfaces like concrete and asphalt prevent rainwater from soaking into the ground. Instead, water flows across the surface, increasing runoff speed and volume. This can overwhelm drainage systems, cause flash flooding, erode land, and carry pollutants into nearby waterways and oceans.