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Lerma-Chapala Basin Mexico - Coggle Diagram
Lerma-Chapala Basin Mexico
Brief Detail about the basins
Lake Chapala located at central of Mexico
Have an area about f 110,000 ha and
with approximately 7900 hm3 of storage capacity
The shallowness of the lake is its defining feature as an ecosystem with a mean depth of only 3 m
The Lerma-Chapala basin is second in socio-economic importance to Mexico because more than 10 million people live in the basin,
Largest and most important lake in Mexico
The approach
Subsequent improvements in water governance
Reforms in 1992 and 2004 strengthened the decentralisation process and set up Basin Councils with formal powers to implement the proposed water reallocation policies.
By the early 1980s, six regional water resources offices were set up, including the newly created Lerma-Chapala River Basin Regional Management agency which was given the responsibility of gathering information and designing a Basin Plan.
The Lerma-Chapala Basin Council carried out a hydrological study of the Basin and developed a model to evaluate the impact of various water reallocation policies according to economic, social, technical, political, and environmental criteria.
This model was then used as a basis for water reform in the Basin.
The Council also encouraged extensive collaboration with stakeholders in the Basin and took steps to communicate their work as transparently as possible which reduced the level of conflict over reallocations.
Conclusion
While the move towards IWRM in the Lerma-Chapala Basin has been a long and difficult process, after 30 years, the benefits are starting to be realized
.
I think that IWRM is a good approach to rectify complex water issue.
After IWRM is used
restored natural capacity of lake
improving water quality with the 60% approximation of discharges eliminated
irrigation efficiency is improved
a secured financial investment in water sanitation and treatment programs
Evidences / the way forward
Before IWRM is used
serious imbalances between water withdrawals and availability due to rapid population growth, industrial and agricultural development
Over-exploitation of surface and ground water resources , increasingly frequent conflicts over water allocations, and considerable levels of water pollution and soil degradation due to the rising competition over the basin's water resources as well as the poor governance of the river basin.
90% lost of Lake Chapala's natural volume and 10% of remaining heavy contaminated water
