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Good practice Imported

Xochimilco Chinampas — Treated-Wastewater Canal Recharge Sustaining a Wetland-Farming and Axolotl Refuge System

Mexico · Mexico City · See the Mexico profile · See the Mexico City profile

Evidence: Descriptive / self-reported Top 76% 33/100 · Ask Evidence Copilot about this practice

Since 2004, UNAM's Chinampa Refugio Project has worked with Xochimilco farmers to rehabilitate canal-farming plots recharged partly by treated wastewater, building axolotl refuges — even as surveys record a ~98% collapse of the wild axolotl population between 1998 and 2008.

6,000 to <35 per km2
Wild axolotl density decline (1998-2014)
~40
Chinampas rehabilitated
36
Predator-exclusion refuges built
Xochimilco Chinampas — Treated-Wastewater Canal Recharge Sustaining a Wetland-Farming and Axolotl Refuge System

Details

Maturity
Scaling
Promoter
Universidad Nacional Autónoma de México (UNAM), Laboratorio de Restauración Ecológica
Period
2004–present
Keywords
wetland agriculture, water reuse, biodiversity conservation, cultural heritage

Context

Xochimilco's chinampas are raised farming beds built from canal mud, surviving today largely because treated municipal wastewater keeps the ~207km canal network filled after the original lake was almost entirely drained by Mexico City's growth. The area holds UNESCO World Heritage (1987) and FAO GIAHS (2017/2018) status.

Activities

Since 2004, UNAM's Laboratorio de Restauración Ecológica, led by Luis Zambrano, has run the Chinampa Refugio Project with local chinamperos, rehabilitating chinampas and building predator-exclusion refuges and biofilters for the critically endangered wild axolotl.

Results

The project has rehabilitated around 40 chinampas and 36 refuges, reaching roughly 228 direct and 912 indirect farming-family beneficiaries, funded substantially through UNAM's donation-based AdoptAxolotl campaign.

Conclusions

Peer-reviewed surveys recorded axolotl density collapsing from 6,000/km2 (1998) to 100/km2 (2008) to fewer than 35/km2 (2014 census); only ~17% of Xochimilco's 20,000+ chinampas remain actively cultivated, so restoration is responding to a still-unresolved ecological crisis, not a completed recovery.

Implementation
Indicative cost
Low (< €50k) — Funded substantially through UNAM's donation-based AdoptAxolotl campaign rather than public financing.
Time to results
Long (> 3 years) — Ongoing since 2004.
Staffing & skills
UNAM Laboratorio de Restauración Ecológica, Local chinamperos (farmers)

Conditions for success

  • Local farmer partnership rather than top-down conservation
  • Donation-based funding (AdoptAxolotl) sustaining ongoing operations

Common failure modes

  • Only ~17% of chinampas remain actively cultivated; water pollution and urban encroachment continue
  • No formal government payment scheme underpins the project

Commonly funded by

Philanthropic / foundation funding

Indicative funding routes for practices of this type — always check each programme's current calls and eligibility rules.

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Data sources

Where this practice's information was retrieved from, and when.

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