1. Maximum Daily Precipitation for Aguascalientes, México
Sergio I. Martínez-Martínez
Term Project of GIS in WR
Fall Nov. 21, 2002

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

4. 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.

5. 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).

7. Geographic Procedure. Base Map
Obtain the outline of Aguascalientes.
Draw the stations and towns.
Draw raster of elevations and its derived contour curves.

8. Result: Base Map Outline Stations Towns Raster of elevations
Topographic contour

9. 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.

10. Result: Map of return period of 2 years
Outline
Towns
Raster of elevations
Isohyets of return period of 2 years

11. 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.

12. Data Sources and Bibliography
Precipitation data:
Quintas, I “ERIC II”, IMTA. (In Spanish, it is a database of climatologic variables)
Geographic data:
Map of México was downloaded from (thanks to Carlos Patiño):
DEM obtained from:
Other data:
Hydrologic procedure:
Martínez-Martínez, S.I. (2000) “Introduction to Water Surface Hydrology”, Autonomous University of Aguascalientes, México. (In Spanish).

13. Thank all of You, particularly Dr. Maidment!
Questions?
Thank all of You, particularly Dr. Maidment!