Recharge zones mapping

A research project with the objective to identify and map hydrologic recharge zones (areas where underground water is stored), in a watershed in Guatemala. In this project, we applied supervised classification to Lansat 7 imagery for land cover mapping. During the fieldwork phase,  we collected 135 samples of soil and conducted a laboratory analysis to determine its physical properties, conducted several infiltration tests, and evaluate the quality of water in several springs. We developed a GIS-based methodology for identification of recharge zones. Results included recharge zone maps, a model in ModelBuilder for automating the application of the method to other areas, and scenario-based analysis for estimating the impact of land cover changes. A complete report of this project (in Spanish) is available here.

Below some of the resulting maps.

recharge_zones
Potential recharge zones map

Scenario I: Effect on restoring forest cover in areas with high recharge potential

soil-surveing
Soil samples collection
infiltration-rate-2
Infiltration rate test
infiltration-rate
Soil infiltration rate map.
land use
Land cover maps produced using Lansat imagery
scenarion-2
Scenario I: Effect on restoring forest cover in areas with high recharge potential
scenarion-1
Scenario II: Effect on recharge potential of the complete loss of forest cover

 

muestreo agua 2 nitrate
Quality of water: concentration of nitrates in springs

 

 

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