Maximum Daily Precipitation for Aguascalientes, M

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Maximum Daily Precipitation for Aguascalientes,
México

• Sergio I. Martínez-Martínez
• Term Project of GIS in WR
• Fall 2002. Nov. 21, 2002

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Objectives

• To know the spatial variation of maximum daily
  precipitation in Aguascalientes.
• To draw a map which can be used to design water
  works.

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Data

• Daily precipitation records of 68 climatologic
  stations in Aguascalientes y 12 in its
  neighboring states. The combined data are from
  1940 to 1998.
• A map of Mexico.
• A DEM of Aguascalientes.

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Statistical Procedure (each station)

• Obtain annual maximum and annual exceedance
  series.
• Asign ploting positions.
• Fit the series to a probability distribution or
  regression equation.
• Calculate the maximum daily precipitations for
  the required return periods (2, 5, 10, 20, and 25
  years).

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Geographic Procedure. Base Map

• Obtain the outline of Aguascalientes.
• Draw the stations and towns.
• Draw raster of elevations and its derived contour
  curves.

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Result Base Map

• Outline
• Stations
• Towns
• Raster of elevations
• Topographic contour

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Geographic Procedure. Maps for several return
periods

• Interpolate the attribute of precipitation of the
  stations feature class to a raster.
• Calculate isohyets with the raster of
  precipitation.

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Result Map of return period of 2 years

• Outline
• Towns
• Raster of elevations
• Isohyets of return period of 2 years

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Work in Progress...

• Test if the maximum daily precipitation is
  correlated with the elevation.
• Outline the procedure to utilize the map of the
  return period of 2 years to design water works.

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Data Sources and Bibliography

• Precipitation data
• Quintas, I. 2000 ERIC II, IMTA. (In Spanish, it
  is a database of climatologic variables)
• Geographic data
• Map of México was downloaded from (thanks to
  Carlos Patiño)
• http//ww.fhwa.dot.gov/binational/databank/gis.htm
  l
• DEM obtained from
• http//geoengine.nima.mil./
• Other data
• www.inegi.gob.mx
• Hydrologic procedure
• Martínez-Martínez, S.I. (2000) Introduction to
  Water Surface Hydrology, Autonomous University
  of Aguascalientes, México. (In Spanish).

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Questions?

• Thank all of You, particularly Dr. Maidment!