Agricultural Drought in North-Central Mexico - Monitoring and Predicting Agricultural Drought: A Global Study - page 133

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Figure 10.1 Five northern Mexican states selected for the study.

co llected from the national climatic network. The national climatic net-
w ork is spread throughout the country and is managed by the Servicio
M eteorológico Nacional (SMN; i.e., National Meteorological Services).
Th e CNA determines, for a municipal region, if the rainfall is equal to
or less than one standard deviation from the long-term mean over a time
pe riod of two or more consecutive months. If it is, then the secretary of
st ate declares drought for the region. Based on such a definition, drought
w as declared in 60 municipalities during 2000-01 and in 50 municipalities
du ring 2001-02, out of 67 municipalities in the state of Chihuahua. If a
m unicipality is declared drought-affected, it qualifies for federal funds for
dr ought mitigation.

[133

Table 10.1 The distribution of irrigated and rainfed area in selected states of Mexico

Irrigated Area ( I ) Rain-fed Area ( R )

State (ha) (%) (ha) (%) Area Ratio ( R / I )

Aguascalientes 35,252 5.5 94,884 4.3 2.7

Coahuila 122,484 19.1 53,765 2.4 0.4

Chihuahua 265,410 41.3 634,129 28.6 2.4

Durango 98,762 15.4 508,880 22.9 5.2

Za catecas 120,253 18.7 928,559 41.8 7.7

Total/Average 642,161 100 2,220,217 100 3.5