Guía para la evaluación de inversiones para empresas de prestación de servicios de acueducto

The guide provides a structured approach based on the XLRM framework to assess investments in water supply systems. It emphasizes comparing 'environmental additional investments' (IAA) against traditional infrastructure and efficiency measures. Using two Colombian case studies (Río Chinchiná and Río Chicamocha), the document demonstrates how nature-based solutions like ecosystem restoration can improve water regulation and increase low-flow (Q95) availability, thereby reducing the gap between water supply and demand. It also analyzes the Colombian regulatory framework, specifically Resolution CRA 907 of 2019, which allows certain environmental costs to be recovered through tariffs.

• The proposed methodology uses the XLRM approach, which integrates exogenous uncertainties (X), management strategies (L), models (R), and performance measures (M) to evaluate water system interventions.
• Environmental investments, such as ecosystem restoration and protection, improve hydrological regulation by storing water in soil and vegetation, which specifically increases water availability during critical dry periods (low-flow or Q95).
• In the Río Chinchiná case study, implementing the National Restoration Plan could increase the Q95 flow by up to 0.45 m3/s compared to the baseline, whereas a scenario with no previous environmental investments could have reduced Q95 by 1.97 m3/s.
• Cost-effectiveness analysis indicates that demand management strategies, such as improving water use efficiency and reducing losses in capture and adduction, generally provide the most benefit at the lowest cost compared to environmental or grey infrastructure investments.
• The Colombian regulatory framework, specifically Resolution CRA 907 of 2019, allows water utility providers to include the costs of 'Additional Environmental Investments' (IAA) in the tariffs charged to subscribers to reduce vulnerability to water shortages.
• The Ministry of Housing, City and Territory (MVCT) defines six types of Additional Environmental Investments: land purchase and isolation, aquifer recharge projects, restoration, protection of basin buffers, water resource monitoring, and payments for environmental services (PSA).

APA

Santos, T., Lima, N., Rodríguez, Y., Zamora, D., Angarita, H., & Purkey, D. (2024). Guía para la evaluación de inversiones para empresas de prestación de servicios de acueducto. Stockholm Environment Institute. https://www.sei.org/wp-content/uploads/2023/09/guia-metodologica-tarifas-cra.pdf

Chicago

Santos, Tania, Nilo Lima, Yesica Rodríguez, David Zamora, Hector Angarita, and David Purkey. Guía para la evaluación de inversiones para empresas de prestación de servicios de acueducto. Stockholm Environment Institute, 2024. https://www.sei.org/wp-content/uploads/2023/09/guia-metodologica-tarifas-cra.pdf.

Wikipedia

{{cite report |last1=Santos |first1=Tania |last2=Lima |first2=Nilo |last3=Rodríguez |first3=Yesica |last4=Zamora |first4=David |last5=Angarita |first5=Hector |last6=Purkey |first6=David |title=Guía para la evaluación de inversiones para empresas de prestación de servicios de acueducto |publisher=Stockholm Environment Institute |date=March 2024 |url=https://www.sei.org/wp-content/uploads/2023/09/guia-metodologica-tarifas-cra.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{santos2024gua, author = {Santos, Tania and Lima, Nilo and Rodríguez, Yesica and Zamora, David and Angarita, Hector and Purkey, David}, title = {{Guía para la evaluación de inversiones para empresas de prestación de servicios de acueducto}}, institution = {Stockholm Environment Institute}, year = {2024}, month = mar, url = {https://www.sei.org/wp-content/uploads/2023/09/guia-metodologica-tarifas-cra.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }