Embed Size (px)
Citation preview
Carlo Cafiero – [email protected] Antonio Massarutto - [email protected]
Raffaella Zucaro - [email protected]
SIGRIAN AS A DECISION SUPPORT SYSTEM FOR THE ECONOMIC EVALUATION OF IRRIGATION INVESTMENTS
INEA – National Institute of Agricultural Economics
Istituto Nazionale
di Economia Agraria
Ministero delle
Politiche Agricole
Alimentari e Forestali
Ministry of Agriculture and Regions are competent for programming and budgeting irrigation investments
Istituto Nazionale
di Economia Agraria
Priority measures able to cope with inadequacy of the current national irrigation system:
a. Restoring efficiency in water supply b. Completing existing irrigation schemes to achieve their
full functionality c. Improving water catching systems d. Modernizing distribution networks e. Setting up measurement and control systems f. Increase reuse of treated waste water for irrigation
purpose
Programming and budgeting irrigation investments Ministero
delle Politiche Agricole
Alimentari e Forestali
Requirement of models for programming and budgeting investments in irrigation infrastructures, to reduce water losses and to promote a more rational and efficient use of water
National Information System for Water Management in Agriculture
Istituto Nazionale
di Economia Agraria
Ministero delle
Politiche Agricole
Alimentari e Forestali
• Section I: Local Agencies for water management
• Section II: Water supply
• Section III: Adduction ad distribution networks
• Section IV - Miscellaneous
SIGRIAN
Istituto Nazionale
di Economia Agraria
Ministero delle
Politiche Agricole
Alimentari e Forestali
Section I and IV
Section I and IV
Istituto Nazionale
di Economia Agraria
Ministero delle
Politiche Agricole
Alimentari e Forestali
Section IV Information relating to other authorities involved in irrigation water management and wastewater treatment plants to evaluate the potential reuse of purified wastewater as a source of irrigation water
In Italy 53% of irrigated farms take water exclusively from collective irrigation network
Collective irrigation management is guaranteed by more than 600 Local Agencies for water management: 86% of them
operate in the North, 6% in the South, 5% in the Centre and the rest in the Islands
Section I Main characteristics of Local agencies for water management • structural and agronomics characteristics • staff employed in irrigation management • water pricing
Istituto Nazionale
di Economia Agraria
Ministero delle
Politiche Agricole
Alimentari e Forestali
Section II and III
Istituto Nazionale
di Economia Agraria
Ministero delle
Politiche Agricole
Alimentari e Forestali
Section II • Describes the irrigation nets, from water catching to the
distribution. • Sources are described from a management point of view,
withdrawal rights and structures • Information on volumes of water withdrawal, types of
supplies, potential and actual availability of water for irrigation and water quality of sources
Section III • Contains data about technical and structural
characteristics of irrigation network, from the supplies to the distribution
Section II and III
National Irrigation System Ministero
delle Politiche Agricole
Alimentari e Forestali
Istituto Nazionale
di Economia Agraria
• 3,400 sources, 73% of them are located in the North, 18%
in the South, 7% in the Centre and the rest in the Islands
• mainly withdrawal from surface water sources (40%),
followed by withdrawal from groundwater (37%)
• 12,300 km of irrigation networks in the North and 6,100
km in the South and Islands; in the Central Italy irrigation
network is not very developed, approximately 1,500 km
• the most modern and efficient networks, which allow the
use of efficient irrigation systems prevail in the South and
Islands (52% of pressure pipes), and even more in Central
Regions (70% ) and close to Alps in Trento (91%)
• In the North prevail open channels (80%)
An evaluation model: criteria Ministero
delle Politiche Agricole
Alimentari e Forestali
Istituto Nazionale
di Economia Agraria
• The major component of the economic value of irrigation
water stems from its contribution to agricultural
production.
• Such value is particularly high during periods of relatively
scarce natural supply through rain and snow.
• Irrigation as a drought risk management tool
• The relation existing between water availability and its
economic value is highly non-linear: low value in “normal”
conditions, high value in periods of stress.
An evaluation model: issues Ministero
delle Politiche Agricole
Alimentari e Forestali
Istituto Nazionale
di Economia Agraria
The number and variety of stakeholders and their interests,
ranging from public health, social welfare, and economic
prosperity, necessarily call for actions with strong law and
political connotations.
The dynamic nature of the problem, implies:
The existence of large uncertainty associated with
prediction of event that might occur over the time span
of any investment life
The need to express judgments in terms of expected
impact on the probability of benefits and costs, and to
find a way to discount them to the moment in which
decisions are made.
An evaluation model: phases Ministero
delle Politiche Agricole
Alimentari e Forestali
Istituto Nazionale
di Economia Agraria
a) Identification of the unit area of analysis, which may overlap
with an hydrographic basin or (more likely) part of it.
b) Identification of the relevant time horizon
c) Estimation of the time distribution of water availability in each
area
d) Estimation of the relationship existing between water sources
and farm gate water availability.
e) Estimation of the relationship existing between farm gate water
supply and quantity of agricultural production.
f) Estimation of the relationship between quantitative
agricultural production and its economic value.
Conclusions Ministero
delle Politiche Agricole
Alimentari e Forestali
Istituto Nazionale
di Economia Agraria
The methodology is strongly based on the existing SIGRIAN, a geographic
information system on the Italian network of irrigation infrastructures.
The system is developed with an eye carefully devoted to the optimization
of existing data and information, by avoiding duplication of efforts and
in the attempt to make the most out of the already rich wealth of
information.
We need to improve the existing widespread lack of information about the
availability of water and its consumption for agriculture, essential to
know real irrigation needs of our territory.
The work is still ongoing, but the progress achieved so far makes us
confident that in the near future, policy makers, administrative bodies
and various other stakeholders concerned with water use in Italy will
have a comprehensive and flexible system to guide water resource
decision-making.
