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  <front>
    <journal-meta />
    <article-meta>
      <title-group>
        <article-title>WATERNOMICS (ICT for Water Resource Management)</article-title>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <string-name>Domenico Perfido</string-name>
          <xref ref-type="aff" rid="aff1">1</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Thomas Messervey</string-name>
          <xref ref-type="aff" rid="aff1">1</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Federico Noris</string-name>
          <xref ref-type="aff" rid="aff1">1</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Riccardo Pugliesi</string-name>
          <xref ref-type="aff" rid="aff1">1</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Sander Smit</string-name>
          <email>sander@bm-change.nu</email>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Costa Andrea</string-name>
          <xref ref-type="aff" rid="aff1">1</xref>
        </contrib>
        <aff id="aff0">
          <label>0</label>
          <institution>BM-Change</institution>
          ,
          <addr-line>Hilvarenbeek</addr-line>
          ,
          <country country="NL">Netherlands</country>
        </aff>
        <aff id="aff1">
          <label>1</label>
          <institution>R2M Solution s.r.l. - 2 Piazza della Vittoria</institution>
          ,
          <addr-line>27100 Pavia</addr-line>
          ,
          <country country="IT">Italy</country>
        </aff>
      </contrib-group>
      <abstract>
        <p>WATERNOMICS is a three years EU funded research project and responded to the call FP7-ICT-2013-11. The partners variously specialize in ICT &amp; Automation systems development, sensors development, business model development, water system design, open source based platform, energy and sustainable management, exploitation and dissemination activities. WATERNOMICS will provide actionable information on water consumption/availability to individual households, companies and cities in an intuitive &amp; effective manner at relevant time-scales for decision-making. Key project objectives include: to introduce demand response and accountability principles in the water sector, to engage consumers in new interactive and personalized ways increasing their water efficiency and leads to changes in water behaviors; to provide decision makers with the actionable information they need to get started in the implementation of a water management program. WATERNOMICS will develop a standards based methodology to implement a Water Management System (WMS) as a personalized and customizable solution for stakeholders.</p>
      </abstract>
      <kwd-group>
        <kwd>ICT</kwd>
        <kwd>water savings</kwd>
        <kwd>water management system</kwd>
        <kwd>water consumption</kwd>
        <kwd>raising awareness</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <body>
    <sec id="sec-1">
      <title>Introduction</title>
      <p>
        A lack of information, management and decision support tools that present meaningful
and personalized information about usage, price, and availability of water to end users
can hinder efforts to manage water as a resource. WATERNOMICS aims to address
these issues using innovative information, communication and technology (ICT) tools [
        <xref ref-type="bibr" rid="ref3">3</xref>
        ].
The project will develop and introduce ICT as an enabling technology to manage water
as a resource, increase end-user conservation awareness and affect behavioral changes,
and to avoid waste through leak detection and diagnosis. This report describes the first
version of a standards-based methodology for the development and implementation of
ICT-enabled water management programs. This methodology will, given constraints,
standards, corporate preferences, and key performance indicators (KPIs), provide
decision makers and designers with a systematic way to select technologies, measurement
points, data collection methods, and data management techniques for ICT-based water
management systems.
      </p>
      <p>Currently the limited information available from the water services ecosystem is not
interoperable or not presented effectively to stakeholders. Waternomics overcomes this
problem by implementing a new level of smart meter and sensor technology and a
standard based methodology. These decision support services are enabled by smart water
technology [5], which (i) enables the detailed and real-time measurement of water flows and
usage, (ii) informs analysis of water consumption patterns and (iii) provides key
recommendations on how to increase water efficiency in a holistic context that includes
governance, standards and local area policies and environmental conditions.</p>
      <p>
        Waternomics project aims to raise awareness on water consumption and conservation
issues in a range of different contexts and users [
        <xref ref-type="bibr" rid="ref1">1</xref>
        ]. The project is going to explore and
test applications and results in four different contexts (pilot sites). The first is placed in
Italy in the large corporate environment of an airport (Linate Airport). The second and the
third are to be conducted in Ireland at a primary school building and the Engineering
building of NUI Galway. Finally the fourth pilot is to be conducted in a set of households
in the municipality of Thermi (Greece) engaging domestic environment users.
      </p>
      <p>In the first year of the project a standard based methodology for the implementation of
Water Management System has been developed and is going to be validated and
demonstrated in the three high impact pilots:</p>
      <sec id="sec-1-1">
        <title>1. Domestic: Households in the municipality of Thermi, Greece. 2. Corporate: Operator from Linate Airport in Italy. 3. Municipal: University in Galway, Ireland. 4. Municipal: Public school in Galway, Ireland.</title>
        <p>2</p>
      </sec>
    </sec>
    <sec id="sec-2">
      <title>Objectives</title>
      <p>
        The goal of Waternomics is to explore how ICT can help households, businesses and
municipalities with reducing their consumption and losses of water in the framework of a
water management program [
        <xref ref-type="bibr" rid="ref2">2</xref>
        ]. A key component of the Waternomics project aims at
collecting water consumption and contextual information from different sources to be
used for effective data analytics to drive decision making that optimises water
consumption: e.g., planning, adjustments and predictions and to raise user awareness of water
consumption. In doing this, it is important to develop a common standards-based framework
with which to plan, implement and assess Water Efficiency Measures (WEMs).
      </p>
      <p>To this end, a key outcome of the work consists of designing the first version of
Waternomics methodology and the tools, techniques and methods to put it into action. The
methodology is standards-based and implements best practices and approved guidelines
from the energy sector where efficiency efforts have received greater attention. Intended
attributes of the methodology are that it is simple, able to be useful across the home,
business and community levels, and can be integrated into existing resource management
programs (typically energy) already in place at host organizations. Coupled with ICT in
the form of sensors, meters and the project water information system, the methodology
provides decision makers with the knowledge to enact and implement a water
management program and to realize subsequent water efficiencies.
3</p>
    </sec>
    <sec id="sec-3">
      <title>Outline of the work</title>
      <p>One of the main outcomes of The Waternomics Project is the Standards based
Methodology adopted to guide the project phases.</p>
      <p>Waternomics Methodology is a standards-based methodology developed “ad hoc” for
the development and implementation of ICT-enabled water management programs. This
methodology will, given constraints, standards, corporate preferences, and key
performance indicators (KPIs), provide decision makers and designers with a systematic way to
select technologies, measurement points, data collection methods, and data management
techniques for ICT-based water management systems.</p>
      <p>The desired outcome of the Waternomics methodology is that decision makers and end
users at the community, corporate or home levels have a framework, set of tools, and
references that enable them to take action towards water efficiency measures and to enact
water management programs. The methodology is customizable to the needs of different
end users and as such the report packages phases and activities to carry out the
methodology into a number of discreet, concise and accessible summary briefs.
4</p>
    </sec>
    <sec id="sec-4">
      <title>Materials and methods</title>
      <p>The developed methodology, which in itself is a new development for the water sector,
has five phases: Assess, Plan, Do, Check, Act. These phases are intentionally similar
(with the exception of Assess being added as a first step to engage users) to those of
ISO50001 (Energy Management Systems). In this way, environmental managers and the
organizations, staff and service providers that work with them will immediately recognize
the correlation between energy efficiency and the desired outcome of water efficiency.
Other standards that many stakeholders will recognize include ISO50002 (Energy Audit),
IPMVP (measurement and verification planning), and ISO14046 (Water Footprint). In
this way, a comprehensive and holistic standards-based approach is established. For each
of the phases, the steps to carry out and implement the methodology are provided. The
methodology is customized to for the water sector in areas including Energy-Water
relationships, water related KPIs, technology selection tools, rules to design physical
measurement frameworks and assessment mechanisms.
5</p>
    </sec>
    <sec id="sec-5">
      <title>Results and discussion</title>
      <p>The development of a new methodology can be elusive. Teams working on methodology
development may struggle to define an appropriate scope or lose focus as the process and
way forward is beforehand unknown. The development of the Waternomics methodology
benefitted from the knowledge and expertise of partners like R2M Solution and BMC
(Business Model Change) who brought best practices and ideas from energy sector and
from the business model generation community where ideation, roadmapping, and
iterative process development are community strengths.</p>
      <p>In general five elements, namely: discipline, description, key concepts, rationale and
methods, cover the components of a methodology. These five elements are captured in the
accompanying table</p>
      <p>Waternomics leads to the project methodology which creates a common
standardsbased methodology for the design and implementation of ICT enabled water management
systems. It should be noted that such a methodology is sorely lacking in the water sector
and thus this document is an important step in ensuring water efficiency measures can be
implemented in a similar way that energy efficiency measures have been. The
culmination of the methodology work is a 5 phase methodology (Assess, Plan, Do, Check, Act).</p>
      <p>The methodology draws strong inferences from and integrates the principles of
ISO50001 (Energy Management Programs), ISO 50002 (Energy Audits/Diagnosis),
IPMVP (International Performance Measurement &amp; Verification Protocol) and ISO14046
(Water footprint) into a holistic framework. This is coupled with project activities toward
the development of a water information system, directed at the challenge of water
resource management.</p>
      <p>Several of the associated standards are recent (ISO50002 and ISO14046) and
furthermore the focus of several is energy (ISO50001 and ISO50002). The application and
adaptation of such standards in a holistic framework is innovative and new. It should be
noted that the authors did not confine their research to just energy and water based
standards but also looked across other disciplines.</p>
      <p>However, the Energy-based standards were found to be most relevant and applicable to
this sector. Added to the PDCA cycle is an initial “Assess” phase. Because end users may
be less aware of water efficiency, water scarcity and how/why it affects them, the Assess
Phase in the Waternomics methodology is a deliberate attempt to engage and educate the
end user.</p>
      <p>In assembling relevant standards and in constructing the Waternomics methodology, it
is noted that many standards have overlapping aspects and as such a direct overlay of
each of the steps from the standards would produce redunancies.</p>
      <p>
        It is also true that terminology is not yet completely harmonized across the various
standards and that some propose themselves as an umbrella to group other available
standards [
        <xref ref-type="bibr" rid="ref4">4</xref>
        ]. Regardless of any sticking points, we instead found it most useful to look at
what each standard was trying to do and then to assemble those intents in a logical way
from initial consideration of the problem to its definitive conclusion and/or iterative loop.
      </p>
      <p>The result is a logical process (the five phases) where it was not constrained to have a
one-to-one mapping between a standard and phases (e.g. each phase does not correspond
to only one standard). Figure 2 shows a more refined and full view of the Waternomics
methodology. In specific, the activities, desired outcome, and related standards are shown
for each phase.
1 An additional note on methods: The Waternomics methodology is made of five phases.</p>
      <p>Those phases are broken into a series of activities and these activities can be considered a
method to conduct each phase.</p>
      <p>Each of the five phases has approximately roughly five activities which are the steps
and methods associated with each phase. The approach is general enough to applicable to
the different targeted stakeholders (domestic, municipal, corporate) but also detailed
enough to be useful and actionable.</p>
      <p>Deliberately and by design, the methodology is based on standards so that the approach
overall has a higher likelihood of adoption, uptake and replication. The use of ICT is the
second cornerstone of the methodology and overall the methodology is branded as a
“Standards based approach for the implementation of an ICT-enabled water management
program”.</p>
      <p>In considering the methodology, special attention is drawn to the “Activities.” These in
fact become the core of the methodology and are the steps necessary to accomplish the
phases. Within each activity, various methods are possible. For example, IPMVP offers
four unique methods to calculate a baseline (an activity under the Plan phase). We
propose three different levels (or types) of water audits (an activity within the Assess Phase).</p>
      <p>In using the methodology, it is up to the end user to determine what method and level
of detail from the methodology is appropriate for them. For example, a domestic user may
most appropriately employ only the higher level concepts (phases and select activities).
Instead an environmental manager of a large and complex organization may utilize
available phases, activities, methods and references with more rigor.</p>
      <p>In a further detailing of Figure 2, Figure 3 - 4 – 5 – 6 – 7 provide an additional intuitive
view of the method.</p>
      <p>The goal of the “Assess” phase is to determine whether or not an end user or decision
maker should engage in the construct of a water management program, take water
efficiency measures and/or implement a water information system. During this phase a
decision making team will identify if a water management program can realistically be
deployed and if so, what goals should be met and which strategy is the best to reach these
goals. The activities that make up this phase are:</p>
      <sec id="sec-5-1">
        <title>1. Assess water context 2. Conduct water audit 3. Select strategy, objectives and KPIs 4. Select Water Efficiency Measures</title>
        <p>5.2</p>
        <sec id="sec-5-1-1">
          <title>Phase 1 – PLAN</title>
        </sec>
      </sec>
      <sec id="sec-5-2">
        <title>1. Develop baseline</title>
        <p>2. Conduct water system modelling (if applicable)
3. Plan metering strategy
4. Prepare action plan
5. Select technology</p>
        <p>The goal of the “Plan” phase is to take all necessary actions to fully prepare water
efficiency measures for implementation. The activities that make up this phase are:</p>
        <p>In this plan phase, the activities are highly interdependent and may occur in parallel or
in a different order than presented herein.
5.3</p>
        <sec id="sec-5-2-1">
          <title>Phase 2 – DO</title>
          <p>This phase executes previous planning activities and begins the data collection for
charting and analysis in the following “CHECK” and “ACT” steps. It consists of the
following activities:</p>
        </sec>
      </sec>
      <sec id="sec-5-3">
        <title>1. Meter installation and configuration</title>
        <p>2. Efficiency measure implementation
3. Data collection
4. Water information system deployment
5. Staff training
5.4</p>
        <sec id="sec-5-3-1">
          <title>Phase 3 – CHECK</title>
          <p>According to ISO 50001, an important aspect of management is the process of
continuous improvement. In order to ensure this, regular checks are required to ensure all water
objectives and targets set in the Assess and Plan phases have been achieved. Checks
should also ensure that the Water Efficiency Measures (WEMs) are functioning
optimally. If necessary, corrective measures can be undertaken.</p>
          <p>By frequently and regularly comparing the expected and actual water consumption, it
is possible to quickly detect inefficient use of water or problems in the network. Indeed,
fault detection and diagnosis rules and algorithm are a part of Waternomics research
objectives. In the IPMVP this phase is named “Operational Verification” and its aim is to
check that the WEMs are installed and operating properly and have the potential to
generate savings. Operational verification may involve inspections, functional performance
testing, and/or data trending with analysis. IPMVP includes both operational verification
and an accounting of savings based on site water measurements before and after
implementation of a project, and adjustments. The activities of the Check Phase are:
1. Data Analysis
2. Programanalysis
3. Assess performance
4. Find and fix
5. Document progress
5.5</p>
        </sec>
        <sec id="sec-5-3-2">
          <title>Phase 4 – ACT</title>
          <p>The Act Phase is a systematic leader level review of the program to determine if it is
meeting its objectives, if all or some parts can be concluded, or if adjustments to existing
objectives or new objectives are required. If it is the case that the objectives of the WEMs
are not fulfilled, then one must put in place corrective actions.</p>
          <p>The activities of this phase are:</p>
        </sec>
      </sec>
      <sec id="sec-5-4">
        <title>1. Institutionalize changes</title>
        <p>2. Close appropriate water efficiency measures
3. Evaluate and adjust strategy
4. Communicate progress
5. Determine next actions
6</p>
      </sec>
    </sec>
    <sec id="sec-6">
      <title>Validation Approach</title>
      <p>The effectiveness and efficiency of the Waternomics methodology is assessed both
qualitatively and quantitatively in the project in the following way.
• Development: Throughout its development, meetings and interviews with end users
and targeted stakeholder profiles have been used to both aid development and to
validate the usefulness of the concepts coming into place.
• Coding into the Water Information System: An additional level of scrutiny is provided
when one has to transform from paper (this report) into an interactive software
environment. This is forcing the methodology team to think additionally of “how” to bring
the methodology concepts to end-users in a term internally being called
“methodologization.”
• Use case and exploitation scenarios: D1.1 (Usage Case and Exploitation Scenarios) [6]
is a public Waternomics deliverable that details a series of examples (use cases) that
bring project core concepts to life for end users in an engaging way. These examples
are being connected also to the methodology and two are provided immediately
following paragraphs 6.1 and 6.2.
• Pilots Implementation: Waternomics has four pilots across three targeted stakeholder
groups (domestic, corporate, municipal). These real-world pilots provide a unique and
excellent opportunity to assess the methodology and impact of project results.
• Methodology Revision: Lessons learned from all project activities (and especially the
pilots) will be reflected back into the methodology for a second updated version at
project conclusion.
• Scientific Validation: A peer-reviewed publication is planned to introduce the final
methodology to the scientific community and to receive independent expert feedback.
• PAB Validation: The project has a project advisory board (PAB) consisting of external
experts and organizations that provide feedback on project results. The methodology
will be shared with the PAB and their opinion solicited.
• Methodology Replication: The methodology will pass an initial validation if it is use is
continued and expanded at the pilot activities. After the first cycle of the methodology
(in the project), this would take the form of the decision makers at the pilots
completing the act phase, adjusting strategy and selecting a new round of efficiency measures
to be conducted after the project, thus continuing the PDCA cycle.</p>
      <p>Two use case examples that link project use cases to the project methodology are
provided in the following.
6.1</p>
      <sec id="sec-6-1">
        <title>Example 1: situation</title>
      </sec>
      <sec id="sec-6-2">
        <title>Using</title>
      </sec>
      <sec id="sec-6-3">
        <title>WATERNOMICS methodology in a household</title>
        <p>Situation: Mary and John are married and have two children. They own a house with a
garden in a small village in southern Europe and both are concerned with the
environment.</p>
        <p>Phase 0 - Assess: Mary and John are discussing on how they could decrease their
environmental footprint. They compare their energy and water usage with households that
have similar characteristics. Because they installed solar panels last year, their energy
consumption is below average but their water usage is still a bit high. Looking at their
night-time water usage it is not likely that they suffer from leakages so they decide to
purchase a rainwater harvesting system. Their goal is to reduce their drinking water
consumption with 15%.</p>
        <p>Phase 1 - Plan: Mary is creating an overview of available rainwater harvesting
solutions. They can opt for an underground storage with large capacity or they can decide to
connect a barrel to the drains from the roof. Since they plan to use rainwater for the garden
and the toilets, they decide to go for a 5000 litre underground silo. Mary requests some
proposals from construction companies and selects one that has a fair price and good
service.</p>
        <p>Phase 2 – Do: The construction workers place the reservoir and connect the pipes and
pumps to the drains and the toilet. A smart meter is placed at the entry and the exit of the
rainwater reservoir so Mary and John can still track their total water usage.</p>
        <p>Phase 3 - Check: In the months after the reservoir has been installed, Mary and John
check their water usage. Despite the fact that is summer time, and it did not rain very
much, their drinking water consumption is reduced with 12%. The expectation is that
annually they will save up to 20% of drinking water.</p>
        <p>Phase 4 - Act: With the rainwater harvesting system in place, the house of Mary and
John improves the rating of their house’s sustainability label from rating B to rating A.
Mary is already thinking about how they can improve their environmental footprint even
more.
6.2</p>
      </sec>
      <sec id="sec-6-4">
        <title>Example 2: Using environment</title>
      </sec>
      <sec id="sec-6-5">
        <title>WATERNOMICS methodology in a corporate</title>
        <p>Situation: ABC Company is an established furniture company, producing wooden
furniture for over 50 years and selling their products worldwide. They have one production
plant with offices for the commercial departments located near a medium sized city in the
northern part of Europe.</p>
        <p>Phase 0 – Assess: During a regular strategy meeting, the managing director and the
environmental manager decided that it was time to review their sustainability strategy. They
both noticed an increased interest of their customers about the ecological footprint of their
products and up until now they hadn’t reported about their use of energy, water or carbon
footprint. The results from an assessment showed them that there where gaps in their
information on water consumption. Although the more recently build offices where all
equipped with fine grained meters for water, the water distribution network in the older
part of the factory was never recorded properly. Without this information it would be very
difficult to identify areas for improvement, so they decided to start an action to install
baseline metering throughout all facilities. Their goal was to have metering in place for
water usage on department and production process level and to make the first step in
reaching ISO14046 compliancy.</p>
        <p>Phase 1 – Plan: The project manager who was assigned to lead this project, started with
mapping the locations which lacked proper metering or descriptions of the water
distribution network. Based on the baseline information a plan was made that included a metering
strategy, technical architecture and cost overview. Third parties where invited to make a
proposal for the installation of the sensors and meters and the configuration of the
information systems.</p>
        <p>Phase 2 – Do: Third parties installed the meters and a technology provider installed the
information system and management dashboard. During the whole process, staff from the
factory was closely involved in the implementation process.</p>
        <p>Phase 3 – Check: During the 3 month pilot phase, the complete system was tested and
the collected water usage data was checked against historic data. Results of the pilot where
communicated back to the factory workers and already after 2 months a decrease of water
consumption was measurable.</p>
        <p>Phase 4 – Act: After the pilot phase, the project has reached it goals and was considered
successful. The new information about water usage and performance was included in the
regular reporting structure of the company and new KPI’s on water management where
set. An ISO14046 (water footprint) assessment showed that the company had not fully met
its objectives but had made significant progress. Based on the results of the assessment
and the analysis of water consumption, recommendations for a follow up actions and new
efficiency measures were made.</p>
      </sec>
    </sec>
    <sec id="sec-7">
      <title>Concluding remarks</title>
      <p>This paper presents and discusses one important result in terms of outputs of the
WATERNOMICS project: the standard based methodology.</p>
      <p>With respect to the Waternomics methodology and developed content, the research and
interaction with stakeholders have shown a clear need for this project development.
Waternomics is developing tools, references and resources to assist in the construct and
implementation of water management programs and the execution of water efficiency
measures. Waternomics standards-based methodology offers an innovative way of
merging together the main standards of the water and energy sectors and providing the end
users a step-to step guide to follow in implementing their water saving programs.</p>
      <p>All the Waternomics Team strongly believes in the potential of this project and is
investing heavily in the development of this new ICT technology. In the following months we
will develop the Waternomics Information System and the applications to provide the
water information to the end users and to make them easily apply the methodology.</p>
      <p>At the end of the Waternomics project a final version of the presented methodology
will be presented to the scientific community.</p>
      <sec id="sec-7-1">
        <title>Acknowledgements.</title>
        <p>They project is supported by the EC under grant agreement n. 619660. We would like
to thank the Waternomics Partners and the demonstration sites for supporting in the
project development.</p>
      </sec>
      <sec id="sec-7-2">
        <title>References.</title>
        <p>6. WATERNOMICS: D1.1 – Usage case and initial exploitation scenarios. Public report
(2015).
7. WATERNOMICS: D2.1 – Waternomics Methodology. Public report (2015).
8. WATERNOMICS web site: http://waternomics.eu/</p>
      </sec>
    </sec>
  </body>
  <back>
    <ref-list>
      <ref id="ref1">
        <mixed-citation>
          1.
          <string-name>
            <given-names>Christos</given-names>
            <surname>Kouroupetroglou</surname>
          </string-name>
          , Maarten Piso, Wassim Derguech, Edward Curry, Jan Mink, Diego Reforgiato Recupero, Massimiliano Raciti, Jesse Van Slooten, Daniel Coackley:
          <article-title>Engaging users in tracking their water usage behavior</article-title>
          .
          <source>13th Computer Control for Water Industry Conference (CCWI</source>
          <year>2015</year>
          )
        </mixed-citation>
      </ref>
      <ref id="ref2">
        <mixed-citation>
          2.
          <string-name>
            <surname>Clifford</surname>
            <given-names>E.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Coakley</surname>
            <given-names>D.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Curry</surname>
            <given-names>E.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Degeler</surname>
            <given-names>V.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Costa</surname>
            <given-names>A.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Messervey</surname>
            <given-names>T.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Smit</surname>
            <given-names>S.</given-names>
          </string-name>
          :
          <source>Interactive Water Services: The Waternomics Approach. 16th Int. Conf. Water Distribution Systems Analysis (WSDA</source>
          <year>2014</year>
          ). Bari, Italy.
        </mixed-citation>
      </ref>
      <ref id="ref3">
        <mixed-citation>
          3.
          <string-name>
            <surname>Curry</surname>
            <given-names>E.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Degeler</surname>
            <given-names>V.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Clifford</surname>
            <given-names>E.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Coakley</surname>
            <given-names>D.</given-names>
          </string-name>
          ,
          <string-name>
            <surname>Costa</surname>
            <given-names>A</given-names>
          </string-name>
          .,
          <string-name>
            <given-names>Van Andel S. J.</given-names>
            ,
            <surname>Smit</surname>
          </string-name>
          <string-name>
            <surname>S.</surname>
          </string-name>
          :
          <article-title>Linked Water Data for Water Information Management</article-title>
          .
          <string-name>
            <given-names>B.</given-names>
            <surname>Brodaric</surname>
          </string-name>
          &amp;
          <string-name>
            <surname>M. Piasecki</surname>
          </string-name>
          (Eds.),
          <source>11th Int. Conf. on Hydroinformatics (HIC)</source>
          . New York, USA.
        </mixed-citation>
      </ref>
      <ref id="ref4">
        <mixed-citation>
          4.
          <string-name>
            <given-names>Domenico</given-names>
            <surname>Perfido</surname>
          </string-name>
          , Thomas Messervey, Derguech, Christos Kouroupetroglou, Andrea Costa:
          <article-title>Waternomics (ICT for water resource management) methodology and water information platform</article-title>
          .
          <source>19th International Trade Fair of Material &amp; Energy Recovery and Sustainable Development</source>
          ,
          <string-name>
            <surname>ECOMONDO</surname>
          </string-name>
          <year>2015</year>
          , Rimini, Italy.
        </mixed-citation>
      </ref>
    </ref-list>
  </back>
</article>