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Ambiente & Sociedade

Print version ISSN 1414-753XOn-line version ISSN 1809-4422

Ambient. soc. vol.23  São Paulo  2020  Epub June 08, 2020

https://doi.org/10.1590/1809-4422asoc20190134r1vu2020l2de 

Special Issue: São Paulo Macrometropolis Environmental Governance Forum

PAYMENTS FOR ECOSYSTEM SERVICES TO WATER RESOURCES PROTECTION IN PARAÍBA DO SUL ENVIRONMENTAL PROTECTION AREA1

PAGAMENTOS POR SERVIÇOS ECOSSISTÊMICOS PARA PROTEÇÃO DE RECURSOS HÍDRICOS NA ÁREA DE PROTEÇÃO AMBIENTAL DA BACIA DO RIO PARAÍBA DO SUL

PAGOS POR SERVICIOS ECOSISTÉMICOS PARA LA PROTECCIÓN DE LOS RECURSOS HÍDRICOS EN EL ÁREA DE PROTECCIÓN AMBIENTAL DE PARAÍBA DO SUL

BRUNA FATICHE PAVANI2 
http://orcid.org/0000-0003-1648-8226

THIAGO CARLOS LOPES RIBEIRO3 

DEMERVAL APARECIDO GONÇALVES4 

WILSON CABRAL DE SOUSA JÚNIOR5 

ANGÉLICA GIAROLLA6 
http://orcid.org/0000-0003-4772-7971

EDUARDO MORAES ARRAUT7 
http://orcid.org/0000-0001-5323-4431

2. PhD. Instituto Tecnológico de Aeronáutica (Aeronautics Institute of Technology). São José dos Campos/SP. Brasil. brunapavani@gmail.com

3. Msc. Instituto Tecnológico de Aeronáutica (Aeronautics Institute of Technology). São José dos Campos/SP. Brasil. engambthiago@gmail.com

4. Msc. Instituto Tecnológico de Aeronáutica (Aeronautics Institute of Technology). São José dos Campos/SP. Brasil. demervas@gmail.com

5. PhD. Instituto Tecnológico de Aeronáutica (Aeronautics Institute of Technology); wilson.cabral.ita@gmail.com

6. PhD. Instituto Nacional de Pesquisas Espaciais (National Institute for Space Research). São José dos Campos/SP. Brasil. angelica.giarolla@inpe.br

7. PhD. Instituto Tecnológico de Aeronáutica (Aeronautics Institute of Technology). São José dos Campos/SP. Brasil. eduardo.arraut@inpe.br


Abstract

One of the benefits of forest and reforestation is linked to the erosion control and reduction of the amount of sediments suspended in water. This study proposes a methodology for Payments for Ecosystem Services associated to these benefits in 24 water supply watersheds, under influence of the Paraíba do Sul River Basin Environmental Protected Area, in Brazil. In order to estimate the water resources protection through the reforestation, the current scenario was compared to a hypothetical scenario, in which degraded pasture are replaced by forest. The avoided soil erosion could reach around 40t.ha-1.yr-1. Reforestation can avoid expenditures in water treatment, sludge disposal and dredging around USD 7.8 million per year. Annual values for PES range from USD 6 to 3,014 per hectare of reforested area. The results highlight the importance of valuing the benefits of the ecosystem services rescued.

Key-words: Payments for ecosystem services; environmental economic valuation; water supply; soil loss; reforestation

Resumo

Um dos benefícios da floresta e do reflorestamento está ligado ao controle da erosão e redução da quantidade de sedimentos em suspensão na água. Este estudo propõe uma metodologia de Pagamentos por Serviços Ecossistêmicos associada a esses benefícios em 24 bacias de abastecimento de água, sob influência da Área de Proteção Ambiental da Bacia do Rio Paraíba do Sul, no Brasil. Para estimar a proteção dos recursos hídricos por meio do reflorestamento, o cenário atual foi comparado a um cenário hipotético, no qual pastagens degradadas são substituídas por florestas. A erosão evitada do solo pode atingir cerca de 40t.ha-1.ano-1. O reflorestamento pode evitar gastos com tratamento de água, disposição de lodo e dragagem em torno de US $ 7,8 milhões por ano. Os valores anuais para PSE variam de US $ 6 a 3.014 por hectare de área reflorestada. Os resultados destacam a importância de valorizar os benefícios dos serviços ecossistêmicos resgatados.

Palavras-chave: Pagamentos por serviços ecossistêmicos; valoração econômica ambiental; abastecimento de água; perda de solo; reflorestamento

Resumen

Uno de los beneficios del bosque y la reforestación está relacionado con control de erosión y reducción de cantidad de sedimentos suspendidos en el agua. Este estudio propone una metodología para Pagos por Servicios de Ecosistemas asociados a estos beneficios en 24 cuencas hidrográficas, bajo la influencia del Área Protegida Ambiental de la Cuenca del Río Paraíba do Sul, en Brasil. Para estimar la protección de recursos hídricos a través de la reforestación, el escenario actual se comparó con un escenario hipotético, en que los pastos degradados son reemplazados por bosques. La erosión del suelo evitada podría alcanzar 40t.ha-1.ano-1. La reforestación puede evitar gastos en tratamiento del agua, eliminación de lodos y dragado de alrededor de USD 7,8 millones por año. Los valores anuales para PSE varían de USD 6 a 3,014 por hectárea de área reforestada. Los resultados destacan la importancia de valorar los beneficios de servicios ecosistémicos rescatados.

Palabras-clave: Pagos por servicios ecosistémicos; valoración económica ambiental; suministro de agua; pérdida de suelo; reforestación

1. Introduction

The vegetation coverage is intrinsically linked to water quality, representing a natural defense that assists in soil maintenance (BERTONI; LOMBARDI NETO, 1985). The ecosystem service of sediment retention provided by natural landscapes is of great interest to water managers, justified by the increase in conflicts over water use and the degradation of water sources (REIS, 2004). Thus, the payments for ecosystem services for ecological restoration in riverbanks is one of the challenges of maintaining public water supply (CHAVES, 2004; ATTANASIO et al., 2012; SÃO PAULO, 2014).

The anthropic influence in a watershed, along with the natural characteristics of the subscribed area shapes the sedimentological behavior of the basin (LIMA et al., 2001). Increases in sediment production affect water quality and reservoir management (WALLING, 2009). The forest coverage in river basins contributes to soil retention and, consequently, reduces water treatment costs for public supply and dredging cost in reservoirs (LIMA et al., 2001).

The Fundação SOS Mata Atlântica (2014) points out that the deforestation and the irregular occupation of the watershed areas have contributed to aggravate the impacts of the historic droughts. Thus, it is fundamental to accelerate the recovery actions of these water basins, either by natural regeneration or through forest restoration efforts to protect the springs and riverbanks.

According to Poupeau et al. (2018), one of the main problems faced by the urban water sector is the lack of financing, mainly due to the non-payment culture of the users, as well as the reluctance of governmental authorities in charging adequate rates for political reasons. Urban operators do not have the resources to carry out the necessary investments. Users, particularly the poorest, suffer the consequences of this situation: a poor-quality service characterized by cuts in the supply and a failing sanitation. For effectivity of the watershed restoration and protection, it is necessary that governments act in an integrated manner and draw up plans with clear targets, with instruments of governance and management.

Estimates in monetary units are useful to show the relative magnitude of ecosystem services (CONSTANZA et al., 2014). The implementation of economic instruments, such as Payments for Environmental Services (PES) for the landowners, municipalities and protected areas, is important to preserve these areas (FUNDAÇÃO SOS MATA ATLÂNTICA, 2014). The water valuation is related to watershed protection, where the vegetation stands out for regulating the water cycle, making the maintenance of flow, minimizing floods, controlling erosion and silting, reducing the carrying of sediments, and thus conserving water quality (SILVA et al., 2008).

The economic thinking applied to the management of environmental protected areas does not include trivial solutions, it requires the consolidation of analysis criteria compatible with the biological, cultural and historical diversity (CAMPHORA; MAY, 2006). The present study applied a methodological proposal for the implementation of payments for ecosystem services related to the benefits for water supply provided by the protection of water resources through the ecological restoration in riverbanks.

The work innovates by associating the ecosystem benefits of soil retention by restoration with the economic valuation, in order to present a methodological proposal that is feasible for comprehension and reapplication by several actors: companies with environmental liabilities, voluntary financiers, rural landowners and government agencies. The expected result for this financial contribution is the improvement of hydrological conditions and vegetation coverage of the basin (ROSA et al., 2004).

2. Material and methods

The methodological proposal links the ecological restoration in riverbanks to economic incentives, justified by the increase in the water quality for public supply. Adapted from Sousa Júnior (2011), the flowchart (Fig. 1) illustrates the calculations of cost than can be avoided in water treatment, sludge disposal and dredging. These avoided costs are generated by reduction in turbidity, calculated through the methodological approach based on the difference the soil loss between two scenarios: current (status quo) and hypothetical (with the ecological restoration).

Source: adapted from Sousa Júnior (2011).

Note:

(1) LULC1 = current scenario

(2) LULC2 = hypothetical scenario

(3) A = average annual soil loss (t.ha-1.yr-1)

R = rainfall erosivity factor (mj.mm.ha-1.h-1.yr-1)

K = soil erodibility factor (t.ha.mj-1.mm-1)

LS = topographic factors

CP = cropping management factors

(4) R = difference between highest and lowest altitude; L = length of main water flow

(5) Qlt = average long-term flow

(6) SR = settling rate of the sediments

(7) “a” and “b” = adjustment coefficients of water treatment

(8) UCSD = unit cost of sludge disposal (USD.m-3)

(9) UCD = unit cost of dredging (USD.m-3).

(10) PES = payments for ecosystem services

Figure 1 Methodological proposal of quantification and valuation of the ecosystem services associated to the benefits for water supply. 

2.1. Case study

The methodological proposal is presented in the development of the case study in the Paraíba do Sul River Basin Environmental Protection Area (Área de Proteção Ambiental Bacia do Rio Paraíba do Sul - APABRPS, in Portuguese). It is the only federal protected area created with a specific objective associated with the protection of water resources for public supply, by National Decree 87,561/1982 (BRASIL, 1982).

This Decree indicated the following measures for recovery and environmental protection: macrozoning; implementation of urban water supply and sewage treatment systems; industrial pollution control; use of legal instruments and government financial incentives to ensure water pollution control and environmental preservation. Only the State of São Paulo stretch has its boundaries approved by Chico Mendes Institute for Biodiversity Conservation (ICMBio), linked to the Brazilian Ministry of the Environment (MMA). There are discussions about a diagnosis of the APABRPS that includes basins that protect new points and changes in water abstraction, but there is still no official information to use as a reference.

The Paraíba do Sul river basin has a drainage area of 56,665 km2: 39% in Rio de Janeiro, 37% in Minas Gerais and 24% in São Paulo. The basin is responsible for supplying approximately 18.5 million people, including metropolitan regions, industrial complexes and agricultural activities (INSTITUTO OIKOS, 2013). This demand is expected to grow even more due to the planned infrastructure for this region, such as the high speed train, the international cargo airport, the new small hydropower plants, the duplication of the highways and the actions linked to Pre-Salt program.

One of the biggest challenges for water in the Paraíba do Sul basin is the design of mechanisms that interact management and policy at various levels of decision-making, both federal and state. There is a need to establish a drought and flood risk plan, implementing joint and negotiable actions between users and stakeholders (NEHREN et al., 2018). With the worsening of droughts in water supply systems, the dispute between the states of São Paulo and Rio de Janeiro increased in the concession and transposition of waters of the Paraíba do Sul River (OECD, 2015).

The APABRPS is inserted in the Atlantic Forest domain and its history of land use and occupation has caused a drastic reduction of its original vegetation coverage, intensifying the natural characteristics of high susceptibility to erosive processes (IPT, 2011). The socioeconomic and environmental scenario of the Paraíba do Sul basin, with an increasing water consumption, in contrast to the high level of degradation of the water production areas, presents great potential for the implementation of PES programs.

2.2. Soil losses

The Universal Soil Loss Equation (USLE; Eq. 1), according to Wischmeier and Smith (1978), is a model to estimate the average soil loss due to erosion, over time in a given area, with specific conditions of cultivation and management. The soil loss potential (A) is the average estimate for the annual soil loss, per hectare, in the studied basin. This equation became the main worldwide reference for the estimation of soil loss by laminar erosion processes, with rainfall activation.

A=R.K.LS.CP (1)

where,

A = average annual soil loss (t. ha-1.yr-1)

R = rainfall erosivity factor (MJ.mm.ha-1.h-1.yr-1)

K = soil erodibility factor (t.h.MJ-1.mm-1)

LS = topographic factors

CP = cropping management factors

The R factor (rainfall erosivity) is the average annual erosion potential of rainfall, considering the soil erosion as a process of sloping and accelerated trailing of soil particles caused by water (water erosion) in an unprotected area of the vegetation coverage. Rainwater exerts an erosive action by the impact of droplets falling with variable velocity and energy, according to their diameters, and by the runoff (BERTONI; LOMBARDI NETO, 1985).

We used the erosivity map elaborated by Moreira et al. (2006), interpolated by Artificial Neural Network for the State of São Paulo. The erosivity map is represented by a grid of 1030 x 1030 meters.

The K factor (soil erodibility) is a soil intrinsic property. It represents the erosion intensity per unit of water erosion index for a specific soil, which is kept uncovered and prepared in the direction of a slope and 9% in a 25m long plot. According to Bertoni and Lombardi Neto (1985), erodibility refers to the soil susceptibility to erosion, which varies naturally by the physical characteristics of the soil.

The erodibility values were obtained in Mannigel et al. (2002), which they used the Boyoucos equation for the indirect determination. For geospatialization, the values were attributed to the pedological map produced by the Agronomic Institute of Campinas (IAC) and Brazilian Agricultural Research Corporation (EMBRAPA), based on Oliveira et al. (1999).

The intensity of the erosion has a close relationship with length and slope. The LS factor is defined as the expected ratio of soil losses per unit area on any slope to corresponding soil losses of a 25m long unit plot with 9% slope. According to Bertoni and Lombardi Neto (1985), the topographic factors are:

  • L: the slope length factor is the ratio of the soil losses of an area with any length of slope and another with a slope length of 25m, for the same soil type and slope;

  • S: the degree of slope factor is the ratio of the soil losses of an area with any degree of slope to slope of 9% for the same soil type and ramp length.

The LS factor was obtained through the method developed by Desmet and Govers (1996) for a two-dimensional surface. To avoid the overestimation in heterogeneous landscapes, long slope lengths are limited to a value of 333m.

The C factor represents the effect of land use and management on the erosion estimation. The soil loss is calculated by purchasing an area with specific cropping and management and another maintained permanently discovered and with soil preparation in the direction of slope. The C factor had spatially distributed through the LULC map provided by Vieira et al. (2013), available by INPE for the State of São Paulo, in scale 1: 250,000. The C factor value was defined for each LULC class (water resource, forest, pasture, cropland, eucalypt and settlement), based on follow references: Silva et al. (2004), Tomazoni et al. (2005), Farinasso et al. (2006), Ribeiro and Alves (2007) and Martins et al. (2010).

The P factor (conservationist practice) is the relation between the soil losses of an area cultivated with a certain conservationist practice, such as: contour planting and planting in strips (BERTONI; LOMBARDI NETO, 1985). In this study, the P factor is considered 1 in all areas and proximities of the protected areas, indicating that there are no management interventions and conservation practices in land use.

Although inserted as an environmental protection area, the historical process of use and occupation of the Vale do Paraíba promoted the elimination of most of the forest coverage of the basin. The low forest coverage of the basin adds to the natural characteristics of the landscape and the relief and the regional climatic conditions, which, when verlapped, impose great vulnerability to erosive processes on large tracts of land. This, together with the conventional methods used in farming practices, results in a great amount of soil loss.

As many pastures are degraded and underutilized, it is suggested the ecological restoration in these areas. Thus, in order to estimate the effectiveness of water resources protection by APABRPS, a second land use and land cover map was designed. In this hypothetical scenario, the pasture areas inserted in the protected area were replacement by forest class (Fig. 2). Consequently, the land-use changes modify the C factor map. For the hypothetical scenario, the C factor of the forest class replaces the factor C for pasture areas. It changes the C factor value from 0.01 to 0.001, indicating the ecological restoration in these areas. The factor C values used to pasture and forest classes can be considered an average and modal value for extensive pasture and forests with dense shrubbery, respectively.

The Atlantic Forest Restoration Pact (RODRIGUES et al., 2009) and the Degraded Areas Restoration Technical Manual (MORAES et al., 2013) point to the 20-year time for secondary vegetation to climax, based on Ferretti et al. (2002). Thus, it can be considered the time for the forest C factor replaces the pasture C factor proposed in the hypothetical scenario.

Source: author’s elaboration.

Figure 2 Land use and land cover maps for current and hypothetical scenarios.  

The hypothetical restoration is justified by the lack of care and subsoil of the pastures in many locations into the APABRPS, indicating the need for change and management in land use and land cover, mainly due to the importance of preserving (in this case, restoring) the environmental protected area and, consequently, reestablishment of the benefits provided by the ecosystem, mainly related to the soil retention by the recovery of forest areas.

We used the Sediment Delivery Ratio (SDR) model of the InVEST software - Integrated Valuation of Ecosystem Services and Tradeoffs, version 3.2, developed by the Natural Capital Project. InVEST is a set of models that explore the benefits of ecosystem services among land-use planning scenarios on a regional scale, indicated primarily for application in public policy and decision making.

The model is based on the Revised Universal Soil Loss Equation (RUSLE) (SHARP et al., 2014). It works on the spatial resolution of the input raster of the digital elevation model (30 m). The maps of erosivity, erodibility and land-use were submitted to map algebra operations for InVEST calculations. Therefore, the soil loss potential (A) was calculated to current and hypothetical scenarios. The objective is to map the sediment generation per unit area and its transfer to the water flow. The transfer rate is the proportion of the soil loss that effectively reaches the water withdrawal outlet (BORSELLI et al., 2008).

2.3. Physiographic characteristics

The digital data used in this study were stored and processed in the ArcGIS software version 10.6, by ESRI, for the composition of the database, processing and presentation of analyzes. All digital data were projected in SIRGAS2000 (Geocentric Reference System for the Americas). The territorial limits of each protected area were acquired through the website of the ICMBio.

For the construction of the hydrography networks, we used the Digital Elevation Model (DEM) of the TOPODATA Project of the National Institute for Space Research (INPE) (VALERIANO, 2008), with spatial resolution of 30 m. These models originate from data from the Shuttle Radar Topography Mission (SRTM), provided by the United States Geological Survey (USGS).

From the DEM, it calculated the directions of water flows through the ground surface, the accumulation of water flow and the hydrography. The hydrography was defined considering that from a value of flow accumulation; this accumulation is a water body. The main watercourses were identified as well as their lengths, start (higher altitude) and end (lower altitude) points.

We analyze 24 water catchment points that intersect with the APABRPS, which are granted by Department of Water and Electric Power of the São Paulo State (DAEE). They were used as reference to obtain the watersheds. Each cell was compared to the neighboring cells, establishing the water flows in the direction of the neighboring cell that presented the lowest elevation value. Thus, the drainage maps was created for each watershed.

2.4. Sediment delivery ratio

The physiographic characteristics subsidize the calculation of sediment delivery ratio (SDR), which is the ratio of the soil loss that effectively reaches out the water catchment (WALLING, 1983). It is assumed that a part of the sludge is maintained in suspension in the water column and another part deposits in the rivers and reservoirs. In basins with reduced flow rate of water, the effects of turbulence are smaller, causing the deposition of particles heavier than water. This flow speed depends on the fresh water discharge, the density gradient, the movement along the water body and wind action on the free surface (MIRANDA et al., 2002).

Chaves (2010) compared several equations to calculate the SDR, and found a great disparity in the results. However, if we consider equations involving more than one variable, the results are similar. The author proposes the Equation 2 below, adapted from Roehl (1962):

logSDR=2.887530.83291cologR/L (2)

where,

SDR = sediment delivery ratio

R = difference between the highest and lowest altitude in the drainage area

L = length of ma in water course in the drainage area

2.5. Sediment yield

The sediment yield (SY) is the sediment discharge through a certain river section per unit catchment area per unit time. Walling (1983) defined it as the relation between the sediment delivery ratio (SDR) and the soil loss potential (A) for the full basin area, being configured as dimensionless and expressed in the following manner (Eq. 3):

SY=SDR.A (3)

where,

SY = sediment yield (t.yr-1)

SDR = sediment delivery ratio

A = soil loss potential (t.yr-1)

The load is the mass transport per unit time. The yield is simply the load normalized for the watershed size. Meade and Parker (1986) have established the great spatial variability of long-term sediment yields at the global scale, controlled by climate, relief, basin size, lithology and damming (MILLIMAN; FARNSWORTH, 2013).

2.6. Hydrosedimentological analyze

The sediment yield is directly correlated to total suspended solids (TSS), varying mainly through water flow and turbidity. Other variables, including relief, basin size, and occurrence of lakes and lithology, should also be considered (MILLIMAN; FARNSWORTH, 2013). The relation between the TSS and the respective water discharge is (Eq. 4):

TSS=SY.Qlt1 (4)

where,

TSS = total suspended solids (mg.L-1)

SY = sediment yield (mg.yr-1)

Qlt = longer-term water discharge (L.s-1)

The suspended sediment delivery usually represents the greater load carried in the flow. In addition, suspended sediment is also considered an important component within the hydrological, geomorphological and ecological processes of the rivers (GAO; JOSEFSON, 2012). The suspended solids in rivers respond quickly to environmental changes. Especially in smaller basins, where the rapid hydrossimetric response modifies suspend solid concentration in time (WALLING; WEEB, 1981).

According Sabesp (2010), the turbidity is the measure of water resistance to light flux, provided by suspended solids in water. In Brazil, the Health Ministry defined that the water produced and distributed to population must be control. The maximum value of turbidity is 5 NTU. The law also indicate the minimum amount and frequency of water tests. The turbidity is also an esthetic parameter to accept or reject the product.

According to Sousa Júnior (2011), the relationship between the suspended solids and the turbidity (T) is well studied and several authors show correlation coefficients between 85% and 95%. In the absence of local empirical data, the author suggests the transfer of functions from similar areas, in order to connect the suspended solids and the turbidity. Teixeira and Senhorelo (2000) estimated a function with correlation coefficient of 92% (Eq. 5):

T={ln[TSS·(1SR)]1.57}/0.1 (5)

where,

T = turbidity (mg/L SiO2 - NTU)

TSS = total suspended solids (mg.L-1)

SR = settling rate

The sediment settling rate (SR) is an estimate, in percentage, of the amount of material that is separated by solid particles suspended in the water. In basins with reduced water flow velocity, the effects of turbulence are lower, causing the deposition of heavier particles than water. This velocity flow depends on the discharge of fresh water, the density gradient, the circulation along the water course and the action of the wind on the free surface (MIRANDA et al., 2002). The SR is defined in 20%, for basins with long and high watercourses.

2.7. Economic analyze

In order the water use for domestic supply, it used three economic methods to value the benefits generated by the ecological restoration of the watersheds. The first two consider the values associated with the costs avoided, both by chemical cost in the water treatment and by the spending with sludge disposal in the water treatment plant. The last is a mitigation cost method, it sets the dredging costs, calculating the expenses for dredging the sediments from the water reservoir.

The process to produce potable water requests several steps and high level of quality control. The cost with chemical products represents around 60% of the total cost in the water treatment plant (REIS, 2004). The turbidity is fundamental to define the amount chemical products for applying to water treatment. High values of turbidity need high concentration of the chemical products to decant impurities in water treatment plants. In Brazil, the water treatment plants use inorganic coagulants in the process to reduce the turbidity through the Equation 6:

C1=a×ln(T)b (6)

where,

C1 = water treatment cost

a, b = adjustment coefficients of water treatment

T = turbidity (mg/L SiO2 - NTU)

In the São Paulo State, Sabesp Company operates most of the water treatment plants. The inorganic coagulant used by Sabesp is the aluminum sulphate. The aluminum sulphate price was of USD 0.2924/kg, according to average price registered by the water supply companies. The price was valued by the National Consumer Price Index (IPCA 2014 - 2018), by Brazilian Institute of Geography and Statistics (IBGE), which reflects inflation in Brazil. The ratio between turbidity and its reduction costs was obtained through the data of a Sabesp standard plant.

‎A scatter plot (Fig. 3) relates the chemical products cost (R$) and the “in natura” water turbidity (NTU), explaining the increase in the treatment cost at high suspended sediment rates. This relation shows the importance of the water quality in the catchment points. The linear trend lines were calculated for the association between turbidity and its reduction cost. They were adjusted in two segments: up to 20NTU (Eq. 7) and from 20NTU (Eq. 8). Therefore, the trend lines express the production cost in the water treatment plants which involves specific expenses to reduce the water turbidity.

Source: author’s elaboration.

Figure 3 Relation between turbidity (NTU) and water treatment cost (USD.m-3), with linear trend lines. 

If the turbidity is less than 20 NTU:

y=0.0004*x+0.0001(R²=0.9547) (7)

If the turbidity is high than NTU:

y=0.00003*x+0.0088(R²=0.99) (8)

where,

y = water treatment cost to reduce the turbidity

x = turbidity measured

The high concentration of the chemical products increases the amount of the sludge. This sludge concentrates the impurities of the water treatment in the plant and have a lot of solids, which must receive correct treatment and disposal (REIS, 2004). The sludge disposal cost is considered to Class 2, non-inert, dry matter and centrifuged. According to the calculation report of the service contract of a water supply company in the São Paulo State, the suggested cost for the transportation and disposal of landfill sludge is US $ 31.78 per ton in the Equation 9 (ODEBRECHT AMBIENTAL, 2015).

C2=UCSD×T0.66 (9)

where,

C2 = sludge disposal cost

UCSD = unit cost of sludge disposal

T = turbidity (mg/L SiO2 - NTU)

The definition of the costs associated with the dredging or de-loading works is not trivial and involves the costs of different dredging equipment, their maintenance, the dredged volumes and the distance from the point of discharge of waste (SOUSA JÚNIOR, 2011). The relative values increase when the scale of the activity is reduced and the access of the machines. The cost of USD 6.62 per ton of dredged material is adopted in Equation 10, corroborating with the costs of sediment removal in desorption activities (BIDONE et al., 2009; SECRETARIA DE PORTOS DA PRESIDÊNCIA DA REPÚBLICA, 2017).

C3=NPE×SDR×SR×UCD (10)

where,

C3 = dredging cost

NPE = natural potential for erosion (t.yr-1)

SDR = sediment delivery ratio

SR = settling rate

UCD = unit cost of dredging (USD.m-3)

The supply of the good quality water to water supply company is an ecosystem service provided by the forest coverage. This benefit is generated by protection of the vegetation and the soil in the watershed, avoiding the suspended sediments in water. In theory, the total economic value of the soil loss can be represented by the sum of the values associated, directly or indirectly, to the loss of well-being in the several activities affected by erosive processes. These activities begin with the productivity loss in the rural areas and extend the chain of impacts on water and its users.

3. Results

The soil loss potentials (A) calculated to current and hypothetical scenarios are presented in Table 1 for 24 watersheds that intersect with the APABRPS. The watersheds Rio Una and Rio Bocaina are the greatest difference of the soil loss between the current and hypothetical scenarios, respectively 817.530 and 680.543 t.year-1. Rio Paraibuna, Represa Jaguari 0, Rio Bananal, Ribeirão Gomeral and Rio Guaratinguetá present great savings in soil loss, all more than 100.000 t.year-1. Other watershed instead of did not present large soil loss, they have good savings in relative soil loss. Represa Jaguari 1/2, Represa Jaguari 3, Córrego da Couve, Rio do Braço, Rio do Entupido, Ribeirão Araraquara point from 20 a 65 t.ha-1.year-1 saved with the ecological restoration.

Table 1 Soil loss potential in current and hypothetical scenarios for the watersheds. 

ID Watershed Current scenario Hypothetical scenario Difference
t.year-1 t.ha-1.year-1 t.year-1 t.ha-1.year-1 t.year-1 t.ha-1.year-1
1 Rio da Bocaina 863.305 32 182.762 7 680.543 25
2 Ribeirão das Palmeiras 57.864 17 24.087 7 33.777 10
3 Córrego da Serrinha 625 5 292 2 333 3
4 Ribeirão dos Souzas 23.748 19 13.337 11 10.411 8
5 Represa Paraibuna 434.096 31 383.639 27 50.457 4
6 Rio Paraibuna 7.723.931 18 7.347.581 17 376.350 1
7 Represa Jaguari 0 318.678 19 58.510 4 260.168 15
8 Ribeirão Araraquara 57.344 31 9.646 5 47.698 26
9 Rio do Entupido 68.438 70 21.069 22 47.369 48
10 Reservatório Paraibuna 234.799 58 234.100 58 699 0
11 Córrego da Couve 33.808 75 4.421 10 29.387 65
12 Ribeirão Batedor 65.329 35 31.197 17 34.132 18
13 Córrego Fundo 18.169 11 9.418 6 8.751 5
14 Represa Jaguari 3 8.651 38 1.073 5 7.578 33
15 Represa Jaguari 1/2 4.805 28 519 3 4.286 25
16 Córrego Coura 12.967 33 8.256 21 4.711 12
17 Córrego Prata+Cristo 7.015 37 5.387 29 1.628 8
18 Ribeirão Lemes 19.990 17 19.621 17 369 0
19 Rio Guaratinguetá 205.960 15 93.548 7 112.412 8
20 Ribeirão Gomeral 239.729 67 61.852 17 177.877 50
21 Rio do Braço 89.168 40 43.497 20 45.671 20
22 Rio Bananal 321.776 50 139.695 22 182.081 28
23 Ribeirão Vermelho 76.044 20 48.653 13 27.391 7
24 Rio Una 2.806.457 62 1.988.927 45 817.530 17
Total 13.693.272 836 3.328 1 13.689.944 835

Source: author’s elaboration.

The payments for ecosystem services are calculated through the difference of the potential soil loss between the scenarios. The empirical economic model, according to the proposed methodology, valuate this benefit by the sum of the three costs: savings in water treatment, savings in sludge disposal and savings in dredging.

The greatest savings in the water treatment are to Represa Jaguari 3, Rio Una, Rio Guaratinguetá, Represa Jaguari 1/2 and Rio Paraibuna, respectively. The same watersheds also have the biggest savings in sludge disposal. They show annually savings from 111 to 646 thousands of dollars for water treatment and from 9 to 25 thousands of dollars for sludge disposal. This sludge disposal indicates the contempt of the product that is associated with the water treatment, but one must analyze the process individually in each case.

These watersheds indicated present large variation in the dredging savings, ranging from a few hundred to millions of dollars. The watersheds that reach millions of dollars are: Rio Paraibuna and Rio Una. By adding the avoided values, the PES improve very high values. It demonstrates the importance of the replacement from the pasture to planted forests, which has direct effect in the sediment retention by vegetation and, consequently, lower deposit sediments at the bottoms of reservoirs. These dredging analyzes depend on the feasibility of the PES implementation, aiming at the need to remove accumulated sediments in the reservoirs of each water catchment.

The table 2 shows the avoided costs calculated in this study. Adding the three avoided costs, the Represa Jaguari 3 and Represa Jaguari 1/2 are the greatest savings per protected hectare in the sediment retention services: USD 3,014 and 1,691, respectively. The development of the PES project is justified by the values that would be collected by the avoided costs in several watersheds, such as Córrego da Couve, Rio do Entupido, Ribeirão Gomeral, Ribeirão Araraquara and Córrego Prata+Cristo.

Table 2 Economic valuation (USD.year-1) for the Payments for Ecosystem Services at watersheds. 

ID Watershed Water Treatment Sludge disposal Dredging Absolut PES (USD.year-1) Relative PES (USD.ha-1.year-1)
14 Represa Jaguari 3 646,643 25,539 9,521 681,703 3,014
15 Represa Jaguari 1/2 270,436 9,495 2,010 281,942 1,691
11 Córrego da Couve 2,482 453 34,085 37,020 83
9 Rio do Entupido 4,764 859 70,795 76,418 79
20 Ribeirão Gomeral 282 44 204,213 204,538 57
8 Ribeirão Araraquara 71,634 3,867 22,378 97,878 54
17 Córrego Prata+Cristo 603 111 8,838 9,552 51
3 Córrego da Serrinha 4,799 239 530 5,568 47
19 Rio Guaratinguetá 462,406 24,695 122,693 609,794 47
21 Rio do Braço 9,137 1,698 84,809 95,644 43
16 Rio Una 537,603 32,544 1,223,442 1,793,589 40
24 Córrego Coura 503 87 14,928 15,518 40
22 Rio Bananal 7,429 1,327 225,999 234,755 37
12 Ribeirão Batedor 16,833 3,442 38,445 58,719 32
1 Rio da Bocaina 44,894 4,983 484,272 534,148 20
23 Ribeirão Vermelho 29,665 1,749 40,064 71,478 20
18 Ribeirão Lemes 7,755 1,248 12,931 21,934 19
4 Ribeirão dos Souzas 93 15 20,079 20,186 17
2 Ribeirão das Palmeiras 26,299 1,501 19,806 47,606 15
5 Córrego Fundo 7,673 454 11,077 19,204 12
7 Represa Jaguari 0 45,818 3,163 144,251 193,232 12
13 Represa Paraibuna 1,351 237 159,095 160,683 12
6 Rio Paraibuna 111,327 9,865 2,373,046 2,494,237 6
10 Reservatório Rio Paraibuna 18,070 1,176 100,149 119,396 -
Total 2,328,498 128,789 5,427,456 7,884,743 14

Source: author’s elaboration.

In order the public supply, the savings total more than USD 7.8 million for water treatment, sludge disposal and dredging costs. Considering the 24 watersheds within the APABRPS, the annual average value estimated for PES is USD 226.89 per hectare, ranging from USD 6 to 3,014 depend on the watershed. This average value is greater than all opportunity costs of land calculated for the cities under APABRPS influence. The average opportunity cost is USD 81.58, ranging from USD 29.16 to 125.89 for 23 cities in studied area, based on Young (2016).

The comparative analysis of land-use decisions between farming and forestry allow to reanalyze the competition for land, as well as the substitution of inputs and other factors of production. Concentrating investments in restoration hotspots, which landscapes have high benefits and feasibility, it would maximize the potential to mitigate anthropogenic impacts and improve human well-being (Brancalion et al., 2019). The reforestation in highly productive agricultural lands in southern Chile contributed to increase it (TORRES-SALINAS et al., 2016).

For the conservation of nature through ecological restoration, the average costs with fencing and forest recovery are very high, reaching USD 2,358 ha-1.year-1 when included in transportation of inputs and administration (YOUNG, 2016). Although the restoration costs are not considered, the results indicate benefits (avoided costs) higher than the opportunity costs of the several degraded areas that intersect with the protected area (YOUNG, 2016). On other hand, the low economic values showed for some watersheds may not be sufficient to justify the land-use change: from degraded pasture to forest, because the cost of the project implementation tends to be higher than the collection.

Costa Rica’s national program pays landowners who cooperate with forest plantations at USD 550 ha-1 for 5 years (PAGIOLA, 2008). Financing comes from fossil fuel sales tax rates, the World Bank, the Global Environment Facility (GEF), and others. Pagiola et al. (2013) indicates that government-funded programs generally cover much larger areas, but are less likely to be efficient because they lack direct information about the value of the service or the quality of its supply, and the government’s need to respond to numerous pressures that are often oblivious to the objectives of the program. The user-funded programs are more likely to be efficient, with users not only providing funding but also observing the value and quality of the service received.

4. Conclusions

This paper presents a methodologic proposal for the economic valuation to be used in the implementation of Payments for Ecosystem Services programs associated with the water resources protected under the ecological restoration inside the APABRPS. The PES mechanism is proposed to encourage farmers to restore their underutilized pastures, promoting new forest areas. This will overcome some constraints and obstacles to ecological restoration and agroforestry, mainly linked to the lack of initial funding and the sustainability of the investments made.

As there was no explicit calibration of the data for insertion in the model, it recognizes a weakness in the estimation of soil loss and turbidity, and the data should be used after cautious comparison with empirical data or other references. Despite the uncertainties of the estimates of soil loss and avoided costs, all analyzes were made regarding the difference between land use scenarios, which reduces the error of the estimates, and the results can be considered qualitatively, but they should still be cautious for quantitative values.

The sediment retention service provided by natural landscapes is of great interest to managers of water resources. The knowledge of the areas where the sediments are produced and transferred allows the creation of better strategies to reduce the sediment load. The accuracy of sediment retention value is mainly limited by two factors: quality of information of sediment removal costs and the user’s ability to calibrate it with real sedimentation data. The size of the drainage basin and the percentage of the protected area also influence the PES value.

Farther, the public water supply may be compromised if the protection of upstream watersheds does not occur. Charging for the use of the benefit may be necessary for financing the management and provision of the natural resource. In the case of water, for example, the management costs of the supplying area can be associated with water availability or pollution control. Thus, it is justified the charging on those who benefit from the protection of water resources, whereas these values should be passed on to those who help to restore the ecosystem services. The expected result of this financial contribution is the improvement of hydrological conditions of the Paraíba do Sul river basin.

The PES is an instrument for sustainable development at the local level that combines forest restoration objectives with economic incentive objectives. This will increase investment in the development of alternative sources of income for communities in areas of forest recovery. If the water policy do not give priority to economic criteria, it would generate depletion of the resource and inequalities in water access.

The ecosystem service of freshwater quality maintenance is one of the main highlights in the studies and projects of PES in Brazil and the world. It indicates the need for water supply, as well as other unaccounted water uses: electric power generation, animal consumption and producing, cropland, industrial processes, among others. In addition to multiple-use water, the reforestation and the forest conservation may improve other ecosystem services, such as climate regulation, disease regulation, genetic resources, nutrient cycling and recreation. Thus, the PES project implementation recognizes the importance of these benefits generated by the ecosystem.

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1. Acknowledgments:

We are grateful to everyone involved in the development of the Cooperation Agreement of the Brazilian Ministry of the Environment (MMA), through the National Environment Program II, the Biodiversity and Forests Secretariat and Protected Areas Department, which recognized the importance of ecosystem services for water supply, subsidized this study. We thank the staffs and representatives of the Chico Mendes Institute for Biodiversity Conservation (ICMBio), the Basic Sanitation Company of the São Paulo State (SABESP) and the World Wide Fund for Nature (WWF-Brazil).

We are grateful to the Brazil’s Coordination for the Improvement of Higher Education Personnel (CAPES) for the incentive through the doctorate scholarship in the country and the realization of the Doctoral Sandwich Program Abroad, and the research group of the process 2015/03804-9 of the São Paulo Research Foundation (FAPESP).

Received: June 28, 2019; Accepted: November 16, 2019

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