University of Twente Student Theses
Use of wastewater for irrigation and its relationship with local environmental changes in Cochabamba, Bolivia
Román Calvimontes, Carlos Enrique (2009) Use of wastewater for irrigation and its relationship with local environmental changes in Cochabamba, Bolivia.
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| Abstract: | The spatial relationships between the irrigation water sources and the soil degradation was evaluated in the central valley of Cochabamba, Bolivia. ASTER imagery, ground measurements and Geostatistics methods were used for the approach. Imagery was used for the location of salinitysodicity resistant crops. Soils were sampled and analysed for salinity characteristics. Electrical conductivity (EC) and Exchangeable Sodium Percentage (ESP), were interpolated using Orindary Kriging and classified according to well known reference levels. The principal water sources were sampled an analysed for cations, anions, pH, EC and solids. Surface water in channels and groundwater sources were also measured on EC. Water sources present a trend of increasing pollution in downstream sense. EC in water present a high variability (0.1 to>6 dS m-1). Variability on soil EC and ESP is also presented. Most affected areas are those located along wastewater sources, mainly saline-sodic soils, and correspond for most of the 55% of the area. Less affected areas are irrigated with better quality waters used for irrigation. When consulted about general changes in the environment, the community recognized the decreasing of yield and the cropping species changes as the main effects of waste water using. Key words EC, ESP, WWTP (Waste Water Treatment Plant), Rocha River, Tamborada River, La Angostura, Kriging interpolation, water quality, soil salnity, La Mayca. |
| Item Type: | Essay (Master) |
| Faculty: | ITC: Faculty of Geo-information Science and Earth Observation |
| Programme: | Geoinformation Science and Earth Observation MSc (75014) |
| Link to this item: | https://purl.utwente.nl/essays/93078 |
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