Reginaldo Bertolo, Ricardo Hirata, Osvaldo Aly Jr. Economic valuation of groundwater resources impacted by contaminant activities Reginaldo Bertolo, Ricardo Hirata, Osvaldo Aly Jr. September/2016 Resultados preliminares de um estudo solicitado ao CEPAS pelo MP. O objetivo é o de identificar equações simples para a valoração econômica da água subterrânea impactada por atividades contaminantes, Resultados deverão subsidiar as ações do MP em termos de ajustamento de conduta com responsáveis legais por áreas contaminadas.

Valuation of Groundwater – Why? Por que valorar a água subterrânea: porque os aquíferos são importantes para complementar o abastecimento público. Exemplo: RMSP O impedimento de sua utilização representa um grande prejuízo para a sociedade. Aquifers are highly important for water supply 12000 poços 10 m3/s

Valuation of Groundwater – Why? 41 interdicted supply wells in Jurubatuba Flow rate = 2,1 Mi m³/year Cost of 1 m3 (SABESP) = R$ 12,43 Total = R$ 26,2 Mi/year Cost of the use of groundwater would be less than half 3

Economic Valuation of Groundwater Concepts: Ecossistemic functions and services Total Value = direct use + indirect use + optional use + existence Como fazer a valoração: checar publicação para as definições. Aly Jr, Bertolo, Hirata, Pugga. Princípios da valoração dos recursos hídricos subterrâneos impactados por atividades contaminantes. In: Temas de Direito Ambiental. 1 ed. São Paulo: Imprensa Oficial do Estado de São Paulo, 2015, p. 161-184.

Valuation of groundwater – How & when time (t) t=4 t=3 t=1 t=0 Conc. (c) c = 3 = MRBR c=1 Field of remediation Field of full compensation c = 4 = Potability limit t=2 c = 2 fast slow, costly, ineffective T1 is the time: to complete the detailed investigation to predict the time for contaminant decay from C3 to C4 to carry out the valuation Value of Groundwater (VG) VG = (Volume T0-T1 * R$) + (Volume T3-T4 * R$)+ (Volume Optional x R$) Future After completion of the remediation until the potability limit Volume of water of optional use Past to the present (TAC’s wording)

Valuation of Groundwater Plume of contamination in the time T1 Adjacent area with drinking water, but with restrictions of water use due to the risk of plume migration if there is pumping The option for the use of groundwater was prevented Safe area, no restriction for water use

Optional value 120m

Mathematical modeling is essencial Optional value 120m Radius around the plume varies depending on the type of contaminant aquifer types and hydraulics Mathematical modeling is essencial

Contaminated sites by chlorinated solvents

Where to use the new resources? Examples Investigation and remediation of public contaminated areas Regional aquifer monitoring and modeling Development of new technologies for aquifer monitoring PCE DNAPL at 12 m-deep

Prof. Dr. Reginaldo Bertolo The Well – I Ching Symbolizes the center of the social organization Thank you Prof. Dr. Reginaldo Bertolo bertolo@usp.br