Laguna Madre, TX · $80B (proposal)
LGM-19 · South Texas Lago-Madre Retention Matrix
A honeycomb of 15-mile-long shallow basins carved into the earth behind Laguna Madre, designed to catch, slow, and hold surging Gulf waters before they reach inland infrastructure — a giant sponge made of dirt.
Pros
- Radically simple: no moving parts, no power, no gates to fail — just earthworks.
- 35 million cubic meters of earthmoving is big but well within the capability of the mining industry.
- Basins could double as seasonal wetlands and waterfowl habitat between storms.
Cons
- Shallow basins evaporate fast in South Texas heat — they may be dry dust bowls between events.
- Carving a honeycomb into the coastal plain disrupts existing ranching and habitat.
- A sponge only works if it's empty when the surge arrives; back-to-back storms defeat it.
Feasibility: The cheapest and simplest Gulf project, and the honesty of that is refreshing. The Dutch use similar retention polders. The evaporation and back-to-back-storm problems are real but manageable with drainage design. This is the kind of unglamorous earthwork that actually gets built.
Aerial mock-up: A geometric honeycomb of 15-mile shallow basins carved into the earth, designed to capture and slow surging Gulf waters.
