On July 4, 2025, the Texas Hill Country was hit by devastating flash floods that left homes damaged and claimed at least 135 lives. To everyone impacted by the recent Central Texas floods, SBCA sends our heartfelt condolences—with particular compassion for families grieving loved ones and for those who have lost their homes and livelihoods. This tragic event powerfully illustrates how extreme rainfall in overdeveloped watersheds can quickly turn into disaster.
SBCA’s work has in the past and will continue in the future to address the root causes of worsening flood risk—offering both immediate and long-term solutions for regional resilience. We have been widely recognized for our efforts to prevent large-scale development in environmentally sensitive aquifer recharge zones. While the threat that such development poses to water quality is broadly understood, its role in increasing flood risk is often overlooked. Impervious surfaces—like asphalt, concrete, and rooftops—prevent rainwater from soaking into the ground. Stormwater races across these surfaces, gathering speed, volume, and pollutants before pouring into nearby creeks and rivers. This flash runoff overwhelms natural drainage systems, erodes stream banks, and can lead to catastrophic flash floods. In natural Hill Country landscapes, porous soils and vegetation help to absorb rainfall and slow its journey to rivers. But in overdeveloped watersheds, excessive impervious cover can help turn a rainstorm into a flash flood event.
Compare the two segments of the Comal River: a densely developed riverbank (up/left) versus the natural flood defenses (down/right). (Photo 1: Golf and Globetrotting)
Riparian buffers—vegetated areas along the banks of rivers, creeks, and streams—play a vital role in reducing flood impacts. These natural zones act like sponges, absorbing and slowing the movement of runoff before it reaches waterways. Deep-rooted native plants stabilize soil and reduce erosion, while their foliage helps disperse the energy of flowing water. In heavy storms, riparian vegetation can significantly lower peak flood flows by increasing infiltration and spreading water across the floodplain. When these buffers are replaced by pavement, turfgrass, or bare soil, streams lose this protective layer—leading to faster, more forceful runoff and a greater risk of downstream flooding. SBCA’s work to preserve greenbelt corridors and oppose high-density development along sensitive stream banks helps preserve these natural defenses that keep water clean and riverside communities safe.
SBCA is leading efforts across Central Texas to limit impervious cover in watersheds, encourage abundant riparian vegetation growth, and support the healthy hydrology of Hill Country landscapes. We’re actively working to discourage the kind of sprawling development that drives impervious cover and flood risk. We aim to prevent large-scale developments in environmentally sensitive recharge zones that feed Texas Hill Country streams and rivers. Protecting these vulnerable waterways is vital for flood mitigation and long-term regional water security.
Going forward, combating the loss of green cover that leads to the destruction of flood prone areas will be a point of increased emphasis for SBCA, in the hopes that we can help mitigate the effects of future severe storms.
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