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GIS Mapping for Water Supply Infrastructure in JapanJWRC Study Group for International
Comparison of Water Supply Services

August 2018
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What is GIS Mapping?
 The GIS mapping enables water utilities to project positions of water mains onto a

computerized map surface, along with relevant data such as pipe material, diameter,
installation year, ground conditions.

Source: Yokohama Waterworks Bureau

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Characteristics of GIS Mapping Useful at various stages of service delivery from addresing service disruption, tomains network analysis and renewal planning, to checking various data andrecords of facilities, and more.
 The web-based system is easy to use and can be adopted regardless of the sizeof utility
 The data security function can restrict the use of, and access to the system by theuser ID, password, types of data requested, data encryption, historical accessrecord, and others.
 Highly adaptable to future system upgrades for potential service expansion andmodification, including for coordination with the rates management system
 Accumulated data is easy to transfer within the utility.

Basic Function 1 : Simulation of Service Disruption andTurbidity Increase Simulate an impact ofservice disruption due
to scheduledconstruction work

Simulation function of turbidity
increase & service disruption
Highlight thehouseholds to beaffected by turbidity
increase

Data can be incorporated fromother systems such as the rates
management system

Display related information
including affected mains
length upon service disruption

Highlight thehouseholds to beaffected by service
suspension
Simulations can be made under theassumption that specific facilities havebeen modified/upgraded

Simulation results can beexported to Excel sheets

Construction diagrams,service ledgers, and otherrelated data can be linked
and displayed4

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Basic Function 2 : Network Analysis
 Review the composition
mains networkofHighlight the range of waterpressures in different colors

Highlight the areas of service
disruption in different colors

Highlight the estimated range ofresidual chlorine concentrations
in different colors

Source: Public Enterprises Agency, Kanagawa Prefectural Government

6Option 1 : Mobile Device to Check Mapping Data

Operable even when the server is down.

Portability in the field can facilitate emergency response

Work like a tablet computer with a rotatable, touch screen

Source: Saitama City Waterworks Bureau

7Option 2 : Two Types of Interfaces

Two types of interfaces are available according to the needs of the utility

1. Interface with detailed information andmore advanced functions

2. Interface with simplified information and functions
to maximize day to day operation、

Source: Osaka Water Supply Authority

8Option 3-1 : Seismic Damage Estimation to Water Mains Serve the development of mains renewal plans for enhanced seismic resistance Estimate seismic damage to mains using the pipe material and diameter data as GIS
parameters and the data of estimated seismic intensity, ground conditions, andliquefaction probability as mapping data
Estimatedseismicintensity

Grouping bygroundconditions andliquefaction
probability、

Mains data(material,diameter,installationyear)

Estimated mains
damage uponearthquakes

Source: Public Enterprises Agency, Kanagawa Prefectural Government

9Option 3-2 : Seismic Damage Estimation to Water Mains Estimate seismic damage to mains by feeding the information on the epicenters ofpotential earthquakes
Seismic damage estimation to mains via a network analysis support system
震源情報の入力Enter
information on epicenters

被害予測mains damage
Estimated、

Number ofdamage/ 1km
被害数／1km震源地

Source: Chiba Prefectural Waterworks Bureau

10Option 4 : Mains Renewal Decision Support System The utility can select mains with a high renewal priority from the information such as themains corrosion level and estimated areas to be affected by discolored tap water. This
would support the utility’s decision making in terms of mains renewal planning.
The system allows the selection and display of the mains that fit
specific conditions
対象管路
Targetmains、Conditions
that can be specified
抽出条件
Usage
用途

Administrative area
行政区域

管種Diameter

液状化
Ground condition

Material

Liquefaction

口径Year of installation 埋設土壌区分
Road for埋設年度

emergencytransportation
緊急輸送道路Degradation level 漏水発生管路
Historic leakage
経年化

Renewal priority

更新優先管

Corrosion level

管体腐食状況

Yes/No ofFrequency of
ポリエチレン
赤濁水多発
polyethylene
discolored watersleeves
スリーブ被覆区域

Source: Chiba Prefectural Waterworks Bureau

11Option 5 : Emergency Response Support Upon a major pipe failure,
relevant departments feed
the mapping system related
information such as theincident’s location andcauses, the main’s current
condition,
numberof
affected households, andthe progress of restoration
efforts and emergency
water supply. This way,relevant utility personnel
can check the necessary
information in real-time.

Service pipe branched out of distribution mains

Facility locations
Enlarged
image

Service ledger、

Networkdrawings

Reports and planning documents
Reducing valves’ database

Pipe failure record
Colored regional blocks

Areas of service disruption

Source: Water and Sewer Bureau of the City of Kitakyushu

12Option 6 : Identification of Properties of Other Entities Function to identify and project on the map the buried properties of other entities

Source: Bureau of Waterworks, Tokyo Metropolitan Government

13For Better Data Management 1 : Saving Changes
 Register facility modification record- Saving changes on facility upgrades/renewal enables reference to the historicmodification record.
 Save the entire registry upon each update- Saving the entire registry upon every update enables reference to the whole
pipeline condition at certain points in the past.

Source: Osaka Water Supply Authority

14For Better Data Management 2 : Easy Access to Linked Files
Thumbnails make it easy
to find necessary pages

 Features

1. Finding related documents
becomes easy by putting
together various diagrams andlinking them to the GIS
mapping.
2. Many kinds of diagrams data
can be filed efficiently.

3. Confidential information can besafely stored via data masking
and access restrictions.

Pull up the GIS of the location
corresponding to the specified
document、

Pull up the filesof the specified
document
Pull up the files on
facilities from theGIS

Pull up the GIS of thelocation corresponding
to the specified
document

Source: Public Enterprises Agency, Kanagawa Prefectural Government

For Better Data Management 3 : Online Access toMains Network Diagram15

 Function to enable online access to the information on distribution mains, service pipe,water meters and other equipment* Access is limited to specific contractors and developers with the ID and password.
* Information on the customers and primary facilities cannot be viewed.

Source: Bureau of Waterworks, Tokyo Metropolitan Government

For Better Data Management 4 : Online Access toConstruction Schedules16 Publish on the website of the utility the information on the construction date, location,
name of the work, responsible department, and the contractor.

Entering construction information

Publish online information on service
disruption, reduced supply or an increase inturbidity、

Source: Bureau of Waterworks, Tokyo Metropolitan Government

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Effects of Introducing GIS Mapping System
 All the related diagrams and drawings can be viewed now in electronic format
regardless of which department you are in, while in the past only the departmentspecific material could be viewed in paper format.
 Mains network modeling and analysis have become much easier as there is noneed now to make the models manually. More detailed network analysis has also
become possible.
 Related work efficiency has improved.
 Faster response has become possible upon emergency.
 Calculating the ratio of seismic damage to mains has become possible, which used
to be difficult to do in the past.

Japan Water Research Center
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