Tiêu chuẩn iso 24516 1 2016

[ SOURCE:ISO 245 0:2 0 , 2.4 ] 3.2 as et manag ement proc s es that ena le a wat er uti ity t o dir ct, control an o timiz the pro ision, maint enanc an disp sal of infras ructur as et ,

Guidelines for the manag ement of

Part 1:

Ligne s direc trice s p ur la ge stion d’actifs de s système s d’ea x usée s et

COPYRIGHT PROTECTED DOCUMENT

© ISO 2016, P blshed in Sw itz rlan

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written permis ion Permis ion c n be req esed from either ISO at the ad r es below or ISO’s member bod y in the c u try of

F reword v

Introduction vi

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms an definitions 1

4 Principles aspects of the manag ement of as ets 5

4.1 Obje tives an r eq ir ements 5

4.1.1 Obje tives 5

4.1.2 Fu ctional r eq ir ements 5

4.1.3 Pe formanc r eq ir ements 6

4.2 General aspe ts 7

4.2.1 General 7

4.2.2 Princip l aspe ts — Drinking wate uti ties 7

4.2.3 Princip l aspe ts — Drinking wate sys ems 8

4.2.4 Integ rating the princip l aspe ts 8

4.3 R isks an lfe cycle aspe ts 9

4.3.1 R isk 9

4.3.2 Life cycle 1

4.4 Structuring the pr oc s for manag ement of as ets 1

4.4.1 General 1

4.4.2 Strateg ies for the manag ement of as ets 1

4.4.3 Pe iods of plan ing 1

4.4.4 Strateg ic level activities 1

4.4.5 Tactical level activities 1

4.4.6 Operational level activities 1

5 Investigatio

14 5.1 General 14

5.2 Purp se of inves igation 14

5.2.1 General 14

5.3 Dete mine the sco e of the investigation 14

5.4 Data cole tion 14

5.4.1 General 14

5.4.2 Data r eq irement 1

5.4.3 Inventory data 1

5.4.4 Faiur e data 1

5.4.5 Furthe con ition data 1

5.5 Data r eg is e ing an data as ig nment 1

5.5.1 Data r eg is e ing 1

5.5.2 Data as ig nment 1

5.5.3 Geo-refer encing 1

5.6 Review of ex is ing information 1

5.7 Inventory update 1

5.8 T ypes of inves igation 2

5.8.1 Hydraulc investigation 2

5.8.2 Structural inves igation 2

5.8.3 Operational inves igation

2 5.9 Review of pe formanc information 2

5.1 Plan ing of inves igation 2

5.1 Pe formanc tes ing 2

6 A sses ment 22 6.1 Principles 2

6.2 A sses ment of the h ydraulc pe formanc 2

6.3 A sses ment of the s ructural con ition 2

6.4 A sses ment of o erational pe formanc 2

6.5 Comp r e with pe formanc r eq ir ements 2

6.6 Identification of u ac epta le imp cts 24

6.7 Identify causes of pe formanc deficiencies 24

7 Planning 24 7.1 General 24

7.2 Develo integ r ated solutions 2

7.3 A sses solutions 2

7.4 Pr ep r e action plan 2

8 Implementatio 26 8.1 General 2

8.2 Cr eate/update plan 2

8.3 Car y out wor k 2

8.4 Monitor pe formanc 2

8.5 Review pe formanc 2

9 Operatio and maintenanc e 27 9.1 General 2

9.2 Oper ation 2

9.3 Maintenanc 2

10 Rehabiitatio 29 1 1 General 2

1 2 Strateg ic plan for r eha i tation of physical infr as ructur e (long -te m plan ing ) 3

1 2.1 General 3

1 2.2 S rvic lfe and faiur e rate develo ment 3

1 2.3 Dete mining the ne d for r eha i tation of physical infr as ructur e 3

1 2.4 Bu g eting 34

1 3 Tactical plan for reha i tation of physical infras ructur e (mid-te m plan ing ) 34

1 3.1 R isk-b sed ev luation a pr oach 34

1 3.2 In ivid al ev luation an prioritizing 3

1 3.3 C or dination with othe construction activities 3

1 4 Oper ational plan — Implementation of r eha i tation measur es ( hort-te m plan ing ) 3 11 Documentation and eficiency review

36 A nne x A (informative)F r the objecti ves of the manag ement of as ets of dr inking water networ ks 38 A nne x B (informative)Examples for the as es ment of service lfe and faiure rates of pipes 40

A nne x C (informative) Examples for risk co sideratio in manag ement of as ets 42

Biblog raph y 45

ISO (he Int ernational Org nization for Stan ardization) is a worldwide fede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Standards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a l shed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www.iso.org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identif ied d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www.iso.org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

For an ex lanation on the meaning of ISO spe ific terms an ex r s ions r lat ed to conformity as es ment ,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www.iso.org iso/ for word.html

The committ ee r sp nsible for this document is Te hnical Committ ee ISO/TC 2 4, Se vic e ac ti vities

r latin to drinkin wate s up ly sys tems a d was tewate sys tems — Qu lt y c rite ia o the s erv ic e a d

pe frma c e indic ators

A l s of al p rt in theISO 245 6 se ies can be fou d on the ISO websit e

This document is writt en within the o e al conc pt of manag ement of as et w hich is an activity al

org nizations un e take in some man e an t o some degr e It focuses on the detais of mana ing

the phy sical as et at the o e ational level rathe than the org nizational (corporat e manag ement,

s ructural or proc s ) level

Drinking wat er uti ties ar r lant on their as et t o delve their se vic s t o the r sident p pulations

in their jurisdictions The as et (u de grou d pipes, r se v irs, st orag e tanks, tr atment plant , et c )

cole tively form the phy sical infras ructur of the drinking wat er uti ities an ar the conseq enc of

the ac umulat ed ca ital inves ment an o e ational ex en itur s on maint enanc an r ha i tation

o e many years In many of these uti ties, the r plac ment v lue of these p s inves ment wi l

amou t t o many mi ions (even bi lons) of US dolars depen ing on the siz of the community se ved

The infras ructur r pr sent the efor a major societal inves ment in es ential se vic s contributing

t o publ c health an the prot ection of theenvironment

In many cou tries, these as et ha e be n identified as c itical infras ructur s, an pro rammes

ar in plac t o as ur their prot ection or their sus aina i ity Like many othe org nizations ha ing

as et , drin ing wat er uti ities un e takepro rammes of activitiest o manag e the as et t o ensur they

contin e t o me t the ne ds of the community for r l a le del ve y of drinking wat er These manag ement

activities can be at the s rat egic, tactical or o e ational level The activities can be part of a formal

manag ement sy st em, ther sult of spe if ic legislative r q ir ment , or simply ther sult of d e di g enc

b the se vic o e at orsan manag ers

This document can se ve as a sup orting document for uti ties o e ating an as et manag ement y st em

r g rdles of w hethe the uti ties makeuse of any manag ement sy st em s an ard (e.g ISO 5 00 )

In many countries, the e is a r co niz d sus aina i ity pro lem, sometimes r fe r d t o as the

infras ructur g p, w hich r co niz s that for v rious r asons, the infras ructur has not be n

maintained o e the years on a truly sus aina le b sis, i.e fun ing an implementation of r ha i tation

pro rammes ha e be n p s p ned, with a focus inst ead on short-t erm r p irs or an alowed de r ase

in the level of se vic pro ided

The condition of wat er infras ructur s gr atly influenc s the adeq acy of the wat er se vic from

aspe t of q alty, q antity, pr s ur , safety, r la i ity, environmental imp ct, degr e of tr atment

an e onomic eff iciency Sy st em con ition-b sed r ha i tation a pro ches se ve t o me t these

r q ir ment with a focuson a hols ic a pro ch of con ition-b sed, risk-orient ed maint enanc

As the ins al ation an develo ment of wat er as et matur , the o timization of networks wi l

be ome ne es ary in many plac s in orde t o r sp nd t o changing societal an e onomic con itions

Conseq ently, networks ar subje t not only t o ag eing as wel as wear an t ear but also t o ada tation

proc s es r sulting from growth, new legislative r q ir ment , or changing cust ome se vic level

ex e tations This r q ir s drinking wat er uti ties not only t o focus on maint enanc an r ha i tation

but also t o ke p futur r q ir ment an develo ment in min R eha i tation wi l th s be ome

es ential in manag ement of as et , with eve mor s ring ent r q ir ment on the design an ex ecution

of r ha i itation (p rtial r plac ment of spe if ic se tions of the entir network is also conside ed as

r ha i itation)

In r c nt years, much efort has be n a pled t o the w hole is ueof manag ement of as et on two levels:

— What ar the principlesan s ructur of an as et manag ement sy st em ?

— What ar the g ood practic sthat can be implement ed on a t ech ical level t o as es the con ition of

theas et an help de ide w hen as et int erventions (r p ir, r no ation or r plac ment) take place ?

This document desc ibes the information r q ir d an how t o cole t an proc s r la le invent ory,

con ition, o e ational an cont ext data a out drin ing wat er syst ems C n ition data for the

un e grou d wat er infras ructur nota ly inclu e data on faiur These data se ve mainly as a b sis

for sy st ematic maint enanc an can also contribut e data ne ded for benchmarking

R ela le fai ur s atis ics an the data asedesc iption of the con ition ar of p rticular signif icanc for

es a lshing inves ig tion, maint enanc an r ha i itation priorities

This document also pro ides guidanc on how t o def ine a s rat eg on manag ement of as et with

r g rd t o the o e al pe formanc ex e t ed b the drin ing wat er uti ty an othe s akeholde s It

inclu es seve al aspe t of the o e ation an maint enanc , inclu ing as et con ition as es ment an

inves ment s rat egies (new as et an r ha i tation)

The a pro ches ofe ed in this document ar int en ed t o be unive saly a pl ca le, r g rdles of the

s ructur of a given wat er sy st em

The usual an ex e t ed g oal of the efe tive manag ement of as et is t o pro ide an a pro riat e se vic

l fe w hie fulf il ng given r q ir ment in a cos -efe tive manne

This document is int en ed t o pro ide guidanc on the as et ty icaly owned or o e at ed b drin ing

wat er uti ities (networked drinking wat er sy st ems) that ar ex e t ed t o me t cust ome ne ds an

ex e tations o e long er (multi-g ene ational) pe iods

A dditional information on o je tives of manag ement of as et is pro ided in An ex A Information on

the as es ment of ty ical se vic l fe an ag e-b sed fai ur rat es of pipes is shown in Annex B an

risk-b sed prioritization of pipe r ha i tation in An ex C

Guidelines for the manag ement ofassets ofwater suppl y

Part 1:

This document spe if ies guidelnes for t ech ical aspe t , t ools and g ood practic s for the manag ement

of as et of drinking wat er networks t o maintain v lue from exis ing as et

This document does not a ply t o the manag ement of as et of wat erworks ( inclu ing cat chment an

tr atment, pumping an st orag e in the network), w hich ar also phy sicaly part of the drin ing wat er

sy st em an can influenc the manag ement of as et of thepipe network

NOTE 1 T e drin ing water network is tak en t o inclu e b th pres urized an non-pres urized (i.e containing

fre surface flow)con uits an ac es ories such as valves an control or metering eq ipment

NOTE 2 T e mana ement of as ets of drin ing water p mping stations an st ora e in the network wil b

inclu ed in another part of the ISO 245 6 series

This document ocuses on the as et ty ical y owned or o e at ed b drinking wat er uti ties (networked

drin ing wat er sy st ems) that ar ex e t ed t o me t cust ome ne ds an ex e tations o e long er

(multi-g ene ational) pe iods

This document inclu es ex mples for g od practic a pro ches on the s rategic, tactical an

o e ational levels

This document is a plca le t o al ty es an siz s of org nization an / r uti ties o e ating drin ing

wat er sy st ems, an al dife ent roles / fu ctions for the manag ement of as et within a uti ity (e.g as et

owne /r sp nsible b dy, as et manag er/ pe at or, se vic pro ide / pe at or)

NOTE 3 Depen ing on the size an structure of an org nization, the utility can decide t o what e tent it ap lies

the guidance in this document, but in an case, the p ilosop y of this document remains ap lica le to smal an

medium utilities

2 Normati ve r eferences

The e ar no normative r fe enc s in this document

3 Terms and definitions

F or the purposes of this document, the folowing t ermsand definitions a ply

ISO an IEC maintain t erminolo ical data ases for use in s an ardization at the folowing ad r s es:

— ISO Onlne brow sing plat orm:a ai a le at ht p:/ www.iso.org o p

— IECEle tro edia: a aia le at ht p:/ www.ele tro edia.org

as et

ca ital-forming g oods used for the pro ision of the se vic

Not e 1 t o entry: As ets can b tangible or intangible Ex mples of tangible as ets are: lan , buildings, pipes, wel s,

tan s, tre tment plants, eq ipment,hardware Ex mples of intangible as ets are: sof ware, data ases

Not e 2t o entry: Contrary to consuma les, as ets can b depreciated in ac ou ting sy stems

[ SOURCE:ISO 245 0:2 0 , 2.4 ]

3.2

as et manag ement

proc s es that ena le a wat er uti ity t o dir ct, control an o timiz the pro ision, maint enanc an

disp sal of infras ructur as et , inclu ing the ne es ary cos s for spe ified pe formanc s, o e their

grouping of as s ets (3.1) ha ing common charact eris icsthat dis inguish those as et as a group or clas

Not e 1 to entry: Ex mples of as et ty es inclu e, but are not limit ed to, p ysical as ets, information as ets,

intangible as ets, c itical as ets, ena ling as ets, line r as ets, information an commu ications tech olo y

(IC )as ets, infrastructure as ets, movea le as ets, et c

Not e 2 t o entry: Ex mples of p ysical as et ty es in the wat er sector are pipes, valves, p mps or f ilt er of the

same clas , co ting, year of man facture, prod cer or the a eing proces

faiure data

data desc ibing the charact eris ics of the fiur (3.5) caused at a c rtain p int in time on a c rtain as et

of a drin ing wat er or wast ewat er sy st em

3.7

faiure rate

n mbe of fiur s (3.5)pe u it

Not e 1t o entry: In the case of pipelines, e pres ed per kilometre per year

Note 2 to entry: For drin ing water netw orks, in the case of con ections an valves, e pres ed per thousan

3 9

in estig tio

g the ing of al information ne es ary for a de ision making proc s

Note 1t o entry: T is inclu es b th q alitative an q antitative information

[ SOURCE:EN 1 8 8:2 1 , modif ied]

3.1

level of service

se vic t o use s w hich r fle t social an e onomic g oals of the commu ity safety, cust ome satis action,

q alty, q antity, ca acity, r l a i ty, r sp nsivenes , environmental ac epta i ty, cos an a ai a i ty

Note 1 to entry: A def ined level of service can inclu e an combination of the aforementioned paramet er de med

important by the as et owner, user or relevant stakeholder

3.1

l fe cycle cost

t otal cos of an as s et (3.1) throughout it se vic lfe, inclu ing planning, design, cons ruction,

acq isition, o e ation, maint enanc , r ha i tation an disp sal cos s

3.12

maintenance

combination of al t echnical, adminis rative and manag erial actions d ring the lfe cycle of an as et

int en ed t o r tain it in, or r st or it t o, a s at e in w hich it can pe form the r q ir d function

[ SOURCE:ISO 245 0:2 0 , 2.1 ]

3.13

manag ement of as ets

o e ation, maint enanc an r ha i tation of as et of wat er sup ly an wast ewat er sy st ems as a

fu ctional activity

Note 1 t o entry: T is encompas es al neces ary activities for sustaina le operation an maintenance of the

as ets in drin ing water an wastewater syst ems

3.1

o eratio (s)

action( ) taken in the course of normal fu ctioning of drinking wat er or wast ewat er sy st ems

E AMP E Monit oring an re ulation or diver ion of drin ing water or wastewater

[ SOURCE:EN 7 2:2 1 , modified]

3.1

o eratio al plan

document ed cole tion of proc d r s an information that is develo ed, compied an maintained in

r adines for the con uct of o e ations

3.1

performance indicator

metric or measur b w hich the achievement of an o je tive can be as es ed

[ SOURCE:ISO 1 440:2 0 , 3.1.6 ]

3.17

rehabi itatio

measur s for r st oring or up rading the pe formanc of exis ing as et sy st ems, inclu ing r no ation,

r p ir and r plac ment

[ SOURCE:EN 1 3 3:2 14, modified]

rehabi itatio rate

pe c ntag eof entir invent ory w hich is r ha i tat ed or t o be r ha i itat ed on an ann al b sis

3.1 9

service

r sult of a proc s

Not e 1t o entry: Adapted from the def inition of “ prod ct in ISO 9 0 :2 0

Not e 2t o entry: S rvices are one of the four g neric categ ories of prod cts with sof ware, hardware an proces

materials Man prod cts comprise elements b longing to diferent g eneric prod ct cat eg ries Whether the

prod ct is then caled “ ervice” depen s on the dominant element

Not e 3 t o entry: S rvice is the result of at le st one activity neces arily performed at the int erface b tween the

provider of the service an ,in the f ir t place, its user an , in the secon place, a stakeholder S rvice is g neral y

intangible Provision of a service can involve for e ample the folowing:

— activity performed on a tangible prod ct su plied by the user,e.g.wastewat er,

— activity performed on an intangible prod ct coming from the user, e.g proces ing new con ection req ests,

— delivery of an intangible prod ct, e.g delivery of information,

— c e tion of ambience for the user, e.g reception off ices

Not e 4 to entry: T e word “ ervice” in common E glish can also refer t o the entity providing the actions related t o

the subject in q estion, as is implicit in such p rases as “bus service”, “ police service”, “f ire service” an “water or

wast ewater service” In this cont ext an usag e, “ ervice” implies the entity that is delivering the service, e.g “the

p blic transport of pas eng r ”, “the provision of p blic security” , “f ire protection an response”, an “delivering

drin ing water or col ecting wastewater” If “ ervice” can b u der t ood in this way, “water service” b comes

sy on mous with “water utility hence in this document, in order to avoid confusion, only the def inition in 3.1

ap lies

[ SOURCE:ISO 245 0:2 0 , 2.44 ]

3.20

service l fe

pe iod of time aft er ins alation d ring w hich an as et or an as et sy st em me t or ex ce ds the t ech ical

r q ir ment and fu ctional r q ir ment

[ SOURCE:EN 1 9 8:2 1 , modif ied]

3.21

strategic plan

plan containing the long -t erm g oals an s rat egies of an org nization

Not e 1 t o entry: Strate ic plans have a strong e t ernal focus, cover major portions of the org nization an

identify major targ ts, actions an resour e al ocations relating t o the long -t erm survival, value an adoption to

ong ing chang s of an org nization

3.22

tactical plan

prioritization in the medium t erm on the b sisof influencing fact ors/in icat ors on pe formanc , cos s,

risk an faiur pro a i ty an scale of fai ur , inclu ing g ene al det ermination

E AMP E 1 In icator of dama e pro a ility can b a e, usa e an dama e

E AMP E 2 In icator for the ma nitu e of failures can b hydraulic importance an v lnera le

infrastructures

E AMP E 3 General determinations can b t ech olo y of reha ilitation an mat erial

4 Principles aspects of the manag ement ofas ets

4.1 Objecti ves and requirements

4.1.1 Objecti ves

A ccording t o ISO 245 0 an ISO 245 2, the o je tives of drin ing wat er uti ties ar the folowing:

— prot ection of publ c health;

— me ting use s’ r asona le ne ds an ex e tations;

— pro iding se vic s u de usual an eme g ency situations;

— promoting the sus aina i ty of the drin ing wat er uti ty;

— promoting sus aina le develo ment of the commu ity;

— prot ection of theenvironment

Drinking wat er uti ities, in un e taking manag ement of as et, should aim t o manag e their faci ties

sy st ematicaly and efficiently in orde t o sus ain their fu ction, through es a l shment of clear

o je tives, based on as es ment an for cas ing of the con ition of their oft en ext ensive an complex

faci ities

The o je tive of the manag ement of as et is t o ensur that the drin ing wat er uti ty comples with

a r ed sus aina le levels of se vic , w hie also me ting e onomic pe formanc o je tives such as

at aining the leas pos ible o e al lfe cycle cos

F or furthe information on o je tives of manag ement of as et for drin ing wat er networks, se

An ex A

4.1.2 F nctional requirements

In orde t o achieve the o je tives, fu ctional r q ir ment should be es a l shed

Fu ctional r q ir ment cover the drinking wat er network, t og ethe with pumping ins alations,

pr s ur control devic s, r se v irs, wat erworks an othe comp nent The functional r q ir ment

should be conside ed in r spe t of the w hole sy st em t o ensur that ad itions or modif ications t o the

sy st em do not r sult in faiur t o me t the targ et

Fu ctional r q ir ment should be es a l shed that, w hie taking int o ac ount sus aina le develo ment

an w hole l fe cos s inclu ing in ir ct cos s (e.g traff ic cong es ion, mi tary aid pro ided b civi

authorities), ensur that drin ing wat er networks do not ca use u ac epta le environmental n isanc ,

risk t o publc health, or risk t o pe sonnel working the ein

Each fu ctional r q ir ment can r lat e t o mor than one o je tive An in ication of the r lev nc of

each of the functional r q ir ment in achieving the o je tives is shown in Ta le 1

Table 1 — Relatio ship betwe n o jectives and functio al requirements

NO E The n mber of X in ic tes the relevanc of the req irement in a hievin the obje tives

4.1.3 P erfor manc e requir ements

In orde t o ev luat e the pe formanc of the network an t o al ow develo ment of design s an ards,

measura le pe formanc r q ir ment should be det ermined from each functional r q ir ment

F or each fu ctional r q ir ment, the e can be leg l r q ir ment , publc ex e tations an f inancial

cons raint w hich wi influenc the pe formanc r q ir ment

F or each aspe t of pe formanc , dife ent levels can be r q ir d, for ex mple:

a) trigg er levels w hich jus ify early up rading action ac ording t o priority;

b) targ et levels t o aim for in up rading, w hich should be eq al t o the r q ir ment for new

cons ruction, but w hich sometimes can only be achiev ble or ne es ary in the long er t erm

Pe formanc r q ir ment should be r viewed pe iodicaly and updat ed, if ne es ary The pe formanc

r q ir ment for the network should be updat ed aft er major ext ension, maint enanc or r ha i tation

In principle, the pe formanc r q ir ment for a r ha i itat ed network should be the same as those for

a new network

Pe formanc in icat ors ar an es ential t ool in un e s an ing a uti ity’s infras ructur con itions

an ne ds an , in p ralel, ena le in icat or-sup ort ed infras ructur plan ing an de ision making

Pro e ly implement ed, in icat ors pro ide information on the con ition of the as et an the level of

their contribution t o the achievement of the uti ity’ s o je tives

Pe formanc in icat ors should be def ined at s rat egic, tactical an o e ational levels They should

make clear how actions at he o e ational level contribut e t o achieve s rat egic level o je tives Strat egic

level pe formanc in icat ors ar oft en caled “out comes” Ope ational an tactical level pe formanc

in icat ors ar caled “input ”an “output ” r spe tively

4.2 General aspects

4.2.1 General

A dis inction can be drawn betwe n aspe t of the manag ement of as et for the drinking wat er uti ty

or r sp nsible authority an aspe t for the drin ing wat er sy st em t o be manag ed

Manag ement of as et should take int o ac ount

— att ention t o s akeholde s’ r q ir ment , ne ds an ex e tations,

— sus aina i ity of the as et sy st em and the pro ided se vic , an

— themanag ement of risk

The manag ement (of the org nizing a uthority) of the uti ty’ s as et wi be dir ct ed t owards ensuring

the uti ity’s o je tives ar met ( e ISO 245 0)

4.2.2 Principal aspects — Dr inking water utiities

The manag ement of the phy sical infras ructur of drinking wat er uti ties is r co niz d glo aly as a

c itical activity if use ’s an othe s akeholde s’ ex e tations should be r al z d K ey activities inclu e

— thedet ermination of the uti ty’s cur ent an long er t erm o je tives,

— planning an implementing activities t o achieve o je tives, an

— themeans of measuring the pe formanc of the uti ity in me ting these o je tives

A dditionaly, for ensuring long an e onomical l fe cycles, they inclu e

— know ledg e of the la out of the entir wat er sup ly sy st em t og ethe with know ledg e on cos s

(planning, cons ructing, o e ation, maint enanc ),

— know ledg e on a ai a i ty an ne d of r sour es,

— thesele tion of a pro riat e mat erials an comp nent ,

— thechoic of ins alation t ech olo y an cor esp n ing contract ors,

— q alty control of mat erials used an of ins alation,

— maint enanc of as et an as et sy st ems inclu ing routine an incident-r lat ed inspe tion an

inves ig tion, an

— monit oring of o e ating conditions

Efe tive manag ement of as et is a b lanc of minimizing lfe cycle cos sw hie contin ously pro iding

the levels of se vic es a l shed b theuti ity t o me t cust ome and s akeholde ex e tations

Manag ement of the as et inclu es

— maintaining an up-t o-dat e sy st em invent ory,

— monit oring an documenting data,

— as es ing sy st em con ition,

— planning, maintaining or r ha i itating the sy st em,

— o timizing depr ciation an r inves ment,

— identifying an mana ing risks,

— ensuring the sy st em is uti z d/ pe at ed as int en ed, an

— theenvironment in w hich the as et ar functioning

4.2.3 Pr incipal aspects — Drinking water systems

The manag ement of as et of wat er sup ly sy st ems should co e the complet e as et sy st em an the

int er elationship of al as et such as a s raction, wat erworks, an tr atment plant inclu ing the

r sulting wat er q alty, r se v irs, pumping s ations an mains In ad ition, the manag ement of

as et should conside chang es in ne ds an ex e tations of use s an othe s akeholde s as wel as

environmental efe t such as clmat e con itions, consumption of r sour es, p pulation migrations,

an demo ra hy

Henc , this document should be used in conju ction with othe s an ards r g rding manag ement

of as et on wat er sup ly sy st ems such as drinking wat er plant inclu ing tr atment, pumping an

st orag e (an any st orag e in the network)

Drinking wat er sy st ems ar used t o pro ide a se vic t o use s an communities This can be briefly

(an ty icaly) desc ibed as

— del vering of safe drinking wat er in the r q ir d/ gr ed q alty, and

— sup orting the fir brig des with wat er for f ir f ighting if pos ible(depen ing on local r gulations)

In g ene al, drinking wat er sup ly sy st em g ene aly comprises four comp nent :

— wat er sour e;

— intake an transp rt ;

— tr atment if ne es ary, an if a pro riat e, disp sal of r sid es;

— st orag e, transp rt an dis ribution

4.2.4 Integ rating the pr incipal aspects

Manag ement of as et is the a pl cation of the drin ing wat er uti ity’ s as et manag ement principles,

as desc ibed in this document, within the manag ement of the drinking wat er sy st em inclu ing the

drin ing wat er network

Manag ement of the drinking wat er network as et is implement ed with the framework of int egrat ed

drin ing wat er network manag ement

4.3 Risks and l fe cycle aspects

4.3.1 Risk

Risk conside ations ar ne es ary at al levels in the manag ement of as et — the s rat egic, the tactical

an the o e ational levels

Ap ro riat e tr atment of risks arising within the cont ext of an org nization is an imp rtant o je tive

in the manag ement of that org nization as et Risk tr atment is ty icaly done b the introd ction,

or modif ication, of exis ing risk controls S le tion of the mos a pro riat e risk controls should r sult

from a proc s of as es ing org nizational hazards (e.g arising from an as et’s p sitioning or faiur )

Ap ro riat e cou t ermeasur s can then be introd c d in a prioritiz d man e Such measur s can

inclu e o e ation an maint enanc activities as wel as r ha i tation

The e ar many alt ernative t echniq es for identifying, analy sing, ev luating an tr ating risk in

dife ent f ields ( e IEC 3 0 0 an the wat er se t or-spe ific EN 1 9 5- 2) The risk as es ment

methodolo y pro osed in this document is b sed on g ene aly r co niz d risk as es ment principles

(e.g ISO 3 0 0)

These principles inv lve

— risk identification ( in this case, principaly b hazard analy sis),

— risk analy sis,

— risk ev luation, and

— risk tr atment (risk control)

Hazard analysis inv lves s u y of hazards as p t ential ca uses of risk event Risk analy sis conside s the

imp ct (an r lat ed conseq enc s) of a risk event’ s oc ur enc an the l kelho d that that event can

oc ur The drin ing wat er uti ity should define it uti ty-spe if ic risk analy sis a pro ch an c it eria

for risk ev luation, b sed on org nizational o je tivesan ext ernal an int ernal cont ext Risk c it eria

should bedet ermined in t erms of the same dimensions as the p ramet ers used in the risk analy sis The

orde of priority for inspe tion/survey plans should be det ermined b risk ev luation (w hich conside s

the signif icanc of each risk r lative t o al the risks u de conside ation) Ty ical y, this comp rison is

con uct ed b comp ring in ivid al risks’ “ cor s” ( he prod ct of a risk’s imp ct × l kelho d ratings

a ains the org nization risk c it eria), using a risk matrix t o pr sent the r sult

The prioritization of measur s t o tr at (pr vent/r d c ) the imp ct an / r lkelho d of in ivid al

risks’ oc ur enc should be car ied out b comp ring the efe tivenes of individ al tr atment

measur s an their r lat ed cos s, practica i ity an ac epta i ty t o s akeholde s

Drinking wat er-r lat ed as et riskscan be cat eg oriz d int o the folowing two groups:

a) non-influenc a le risks, such as natural disast ers (earth uakes, st orms, flo ds, et c ) or e onomic

situations;

b) influenc a le risks, such as event arising from ac idental damag e, as et det erioration,

mis-o e ation of as et , or mal cious int erfe enc with as et

The folowing ar a few ex mples of as et data r lev nt or as es ing imp ct:

— social influenc , an

— (r p ir or r ha i tation) cos

The folowing ar a few ex mples of as et data r lev nt for as es ing l kel ho d:

— maint enanc data;

This should inclu e

— o timiz d maint enanc planning,

— pipel ne network inves ig tion/inspe tion at r gular int erv ls an wat er los as es ment ,

— use of suita le cons ruction methods an d ra le mat erials,

— co pe ation with othe se vic s or contract ors,

— ene g manag ement,

— o timiz d s an -b se vic ,

— pro e control of o e ational proc s es,

— eff icient deplo ment of s af an ac omplshment of tasks (b q alf ied an / r c rtif ied contract ors,

if ne es ary, w hie r taining cor compet enc s in the uti ty),

— particip tion in benchmarking proje t , an

— deman -b sed mat erials manag ement an control (procur ment an st ock keeping)

F or ex mple, t o r ha i itat e faci ties, the priority of the proje t should be det ermined in the framework

of bu g et w hi e aiming t o minimiz the l fe cycle cos of each as et

4.4 Structuring the pr oc es for manag ement of as ets

4.4.1 General

Int egrat ed manag ement of as et in drinking wat er networks is the proc s of achieving an

un e s an ing of exis ing an pro osed drinking wat er networks and of using this information t o

develo s rat egies t o ensur that the hydraulc, s ructural an o e ational pe formanc me t the

spe ified pe formanc r q ir ment taking int o ac ount futur con itions an e onomic eff iciency

The int egrat ed drinking wat er networks manag ement proc s is i lus rat ed in Figur 1

Figure 1 — Integrated drinking water networks manag ement proces

The int egrat ed drinking wat er networks manag ement proc s has four princip l activities:

— an a pro riat e level of inves ig tion of al aspe t of the pe formanc of the drin ing wat er

networks;

— as es ment of the pe formanc b comp rison with the pe formanc r q ir ment inclu ing

identif ication of the r asons for the pe formanc faiur s;

— develo ing the plan of measur st o be taken;

— implementation of the plan

The ne d for furthe inves ig tion can be ome a p r nt eithe d ring the pe formanc as es ment or

the develo ment of theplan

Int egrat ed drin ing wat er networks manag ement forms the b sis for the o e ation an r ha i tation

of thedrinking wat er networks The information isr gularly updat ed for the futur manag ement of the

drin ing wat er networks

F or larg e drinking wat er networks, for ex mple, w he e one se ving a larg e city, an outl ne int egrat ed

drin ing wat er manag ement plan ma firs be develo ed fol owing an outlne inves ig tion of the

w hole sy st em Mor detaied plans ma then be develo ed for each sub-dis ribution se tion within the

cont ext of the s rat egic outlne plan

The int egrat ed drinking wat er network manag ement plan is furthe develo ed d ring the

implementation phase b subseq ent inves ig tion, as es ment an plan ing t o develo work

pro rammes an in ivid al proje t t o implement the plan

The b u dary conditions should also be conside ed

4.4.2 Strateg ies for the manag ement of as ets

The s rat egies for the manag ement of as et should be b sed on o je tives and r q ir ment ( e

4.1) The risks of not achieving these o je tives an r q ir ment should be identified an manag ed

a pro riat ely

Drinking wat er infras ructur as et should be manag ed an maintained ac ording t o the con

ition-b sed or inspe tion s rat eg This r q ir s devising an inspe tion s rat eg ( e also R efe enc [1 ])

The con ition-b sed or inspe tion s rat eg takes int o ac ount the develo ment of the con ition of

the as et sy stem an single as et an pursues a long -t erm a pro ch It war ant the efficient an

e onomical use of r st oration fu ds although it ma not r d c o e al r ha i itation an l fe cycle

cos s o e a defined long -t erm planning pe iod, but can spr ad these cos s out o e a long er t erm an

can avoid social cos s Cos s depen on actual maint enanc r q ir ment Based on this s rat eg , the

risks can be es imat ed and controled in r lation t o the o je tives det ermined in ac ordanc with 4.1

Only r p iring faiur s leads t o an incident-b sed or faiur s rat eg , w hich incurs lowe maint enanc

cos s in the short t erm but dispro ortionaly high cos s in the long ru Pro a le conseq enc s

can inclu e inadeq at e o e ating safety, high wat er los es, inc eased faiur rat es, wat er q alty

degradation, an pr matur los of the exis ing s ructur and v lue of the infras ructur as et The

risk of faiur s an inadeq acies in sup ly is extr mely high

Fu damental pr r q isit es for e onomicaly eff icient maint enanc should be def ined as early as

p s ible, inclu ing in the design an cons ruction phases of wat er infras ructur

4.4.3 P erio s of plan ing

The sus aina le r ha i tation proc s for the manag ement of as et is, on the b sis of the planning

pe iod un e r view, subdivided int o the folowing thr e int erdepen ent sub-proc s es

[1 ]

( e

Figur 2):

— long -t erm r ha i tation — s rat egic plan ing;

— medium-t erm r ha i itation — tactical planning;

— short-t erm r ha i itation — o e ational plan ing

NOTE The d ration of the plan ing sta es depen s on local cir umstances an the nature of the instal ed

pipes or components

Common time frames ar the folowing:

— s rat egic planning, a out 2 yearst o 40 years;

— tactical planning, a out 2 years t o 5 years;

— o e ational planning, next year

The develo ment of the r ha i itation s rat eg for a long -t erm pe iod focuses on the sco e of

r ha i itation measur s an the r ha i tation bu g et r q ir d t o achieve an t o maintain sufficient

sup ly q alty an network con ition levels It is b sed on an as et ty e a pro ch, e.g c rtain pipe

ty es (mat erial, nominal diamet er, et c ), but not on in ivid al l ne se tions

Figure 2 — L gical steps for the implementatio an evaluatio of rehabi itatio targ ets

[1 ]

In ivid al mains se tions an their environment ar taken int o ac ount only in the r ha i tation

planning During the sub-proc s “ actical plan” , the r q ir d r ha i itation measur s ar det ermined

an prioritiz d for a medium-t erm pe iod b sed on a network ev luation The r ha i tation t echnolo y

an mat erial ar pr sele t ed In the implementation phase, the actual ex ecution of the r ha i tation

measur s in t erms of l ne routing, nominal diamet er, mat erial an cons ruction method is then ex mined

an f ix ed in conside ation of pos ible alt ernative measur s F or this purp se, the sub-proc s es can ot

be conside ed as in ependent, an their r sult with r g rd t o r ha i tation s rat eg , tactics an

o e ational plan should be harmoniz d not only with one anothe , but also with the s rat egic network

s ructur and ca acity plan ing

4.4.4 Strateg ic level acti vities

De ision making sup ort r q ir s in the firs st ep the identification of measura le s rat egic o je tives

( e 4.1) and the ne es ary ev lution an measur ment of the o je tives

[1 ]

Common activities r lat ed

t o det ermining s rat egic o je tives( e also 4.1) should inclu e the fol owing s rat egic activities:

— es a l shing ac epta le /r q ir d levels of se vic , publc safety, publc health prot ection,

environmental prot ection an use satis action;

— ex r s ing those levels in the form of pe formanc in icat ors;

— ln ing those pe formanc in icat ors t o as et pe formanc in icat ors;

— es a l shing adeq at e bi ing rat es an a wat er pric suita le in time t o ensur sus aina le r ven es;

— q antifying sus aina le an pr dicta le infras ructur fun ing r q ir ment

4.4.5 Tactical level acti vities

A ctivities on a tactical level should inclu e:

— analy sing infras ructur as et lfecycles;

— es a l shing o e ational information t o be cole t ed at the o e ational level;

— es a l shing a sy st em for mana ing information;

— analy sing r p rt ed information;

— analy sing the v lue an pe formanc of the as et ;

— analy sing of ( pe if ic) cos of plan ing, ins alation, o e ation, maint enanc an r ha i tation;

— prioritizing infras ructur spen ing from a aia le fu ds;

— maintaining an ac urat e as et data cole tion sy st em;

— as es ing the risks of as et aiur or ina i ity t o me t the int en ed fu ction;

— ensuring that the r q ir d maint enanc is pe formed

A major activity at he tactical level isthe proc s of r viewing in icat ors t o det ermine only prod ctive

an useful cohe ent information, in orde t o avoid overlo ding the information manag ement proc s

The information should be manag ea le an r lev nt

[1 ]

4.4.6 Operational level acti vities

A ctivities on an o e ational level should inclu e:

— cole ting, monit oring an r p rting as et o e ational information an con ition ( e Clause 5);

— control ing cos s;

— plan ing pr ventive maint enanc sched les

[16]

— implementation of r ha i tation proje t

5 Investigation

5.1 General

The inves ig tion should be car ied out in orde t o make an as es ment of the con ition an the

pe formanc of the drinking wat er networks an their comp nent

Inves ig tion is the firs s ag e in the int egrat ed manag ement of as et of drinking wat er networks as

desc ibed in 4.4.1

Damag ed, defe tive or hydra ulcaly o e lo ded mains r pr sent a p t ential hazard r g rding

inadeq at e drin ing wat er sup ly (v lume, pr s ur , q al ty, no contin al sup ly) The pro lems

fou d in exis ing drin ing wat er networks ar fr q ently int er elat ed, an up rading works wi l oft en

be designed t o o e come a n mbe of pro lems at the same time The inves ig tion an planning of

r ha i itation work should be car ied out on complet e ar as of sup ly so that al pro lems an their

causes can be conside ed t og ethe In larg e drinking wat er networks, it can be ne es ary t o s art b

inves ig ting a pro riat e p rt of the sy st em The proc d r s desc ibed in this document can be

a pled in any drin ing wat er network, but detaied a plcation should takeac ount of the ag e, location

an ty e of the network, the mat erials used in it cons ruction, t og ethe with functional an cl matic

fact ors

5.2 Purpose of in vestigation

5.2.1 General

The inves ig tion is car ied out in orde t o make an as es ment of the pe formanc of the drin ing

wat er network an it comp nent This can inclu e:

— inves ig tion aimed at tactical plan ing;

— inves ig tion aimed at o e ational planning

The purpose of the inves ig tion influenc s the wa in w hich it is car ied out (e.g choic of method,

degr e of detai, level of desir d ac uracy) an the wa in w hich the r sult ar as es ed

The as et of the drin ing wat er networks inclu ed in the inves ig tion should be those that ar

ne es ary t o fulfil the purp se of the inves ig tion Ex mples inclu e raw wat er mains, transmis ion

mains, tru k mains, princip l an local mains, se vic pipes, manholes, inspe tion chambe s, met ering

chambe s, pumping s ations, inve t ed siphons, se vic r se v irs, draining mains, monit oring faci ities,

control faci ities an flushing faci ties

5.3 Deter mine the sc ope of the in vestigation

F olowing the r view of the cur ent pe formanc information, it is p s ible t o de ide w hethe t o car y

out an inves ig tion an w hethe the ext ent of the pro lems jus ifies an inves ig tion of the entir

sup ly ar a The ext ent and detai of the subseq ent inves ig tion of the hydraulc, environmental,

s ructural an o e ational aspe t should be det ermined

5.4 Data c ol ection

5.4.1 General

A cq isition of data is an indispensa le b sis for the manag ement of as et but it car ies a cos The

drin ing wat er uti ity should conside w hat data ar important t o acq ir promptly and w hat furthe

data should be acq ir d o p rtu is icaly 5.4 contains detai s of ty es of data as ociat ed with a rang e

of o je t that can be imp rtant t o inform the drin ing wat er uti ty’ s de ision making proc s

[17]

The

drin ing wat er uti ty should conside the purpose for w hich the data ar t o be g the ed an design

Whe e the e is insuff icient information, the invent ory should f irs be updat ed w he e r q ir d an

any othe information should then be cole t ed d ring the hydraulc, environmental, s ructural an

o e ational inves ig tion

Invent ory data pro ide es ential t ech ical information on the drinking wat er network an it

comp nent Ta le 2 gives ex mples of invent ory data

Table 2— Examples of in entory data

Invent ory data at ribut e, if a plca le

T pe of mains (ru k mains,principal mains,

local mains, service pipe)

T pe of component e.g f it ing, joint, g te valve,

but erfly valve, hydrant, air valve, fer ule, meter

-ing eq ipment)

Nominal diameter an / r e t ernal or int ernal

X should be man atory;

O should be optional;

— not ap lc ble;

ID identif ic tion n mber of an as et;

SD s an ard dimension ratio (a method of ratin a pipe’s d rabi ty agains pres ure)

Invent ory data at ribut e, if a plca le

Other tech ical data (e.g wal thick es , SDR,

ty e of co ting, wat er q ality,ty e of jointing)

X should be man atory;

O should be optional;

— not ap lc ble;

ID identific tion n mber of an as et;

SD s an ard dimension ratio (a method of ratin a pipe’s d rabi ty agains pres ure)

5.4.4 Faiur e data

Faiur data pro ide information on faiur s foun in drin ing wat er networks an ar lnked t o

invent ory data A t the minimum, the folowing data should be cole t ed:

— dat e of documentation, aft er f inal r medy;

— dat e of faiur oc ur enc , if k own;

— location (e.g mains ID, co rdinat es, ad r s );

— point of fai ur ;

— ty e of faiur ;

— cause of faiur (e.g ag eing, damag e d e t o othe cons ruction, et c );

— ty e of r medy (r p ir, r no ation, r plac ment);

— cos s ofel minating fai ur ;

— conseq enc of faiur (e.g ro d cola se, leakag e v lume, n mbe of cust ome s without se vic )

F or the det ermination an dia nosis of faiur s, u iform as es ment c it eria should be used an

ex ecut ed b wel-trained pe sonnel

5.4.5 F rther c onditio data

In ad ition t o fai ur data, mor information on the con ition of drinking wat er networks should be

acq ir d as it pro ides v lua le information on the prioritization of r ha i tation measur s

Con ition data on drinking wat er networks ar lmit ed, with the data cole tion methods dife ing

fu damentaly from the cole tion of invent ory an faiur data

The folowing data should be cole t ed, if a plca le an disc rnible:

— dat e of con ition data cole tion;

— location of inves ig tion (e.g mains ID, co rdinat es, ad r s );

— identif ication an plausibi ity information (e.g mat erial, nominal diamet er, pipe co ting, ty e of

jointing);

Table 2 (c ontin ed)

— mains depth;

— o e buiding;

— adhesion of pipe co ting;

— faiur t o pipe co ting;

— data of cathodic prot ection sy st ems;

— elas icity of pipe co ting;

— ext ent of ext ernal cor osion;

— form of ext ernal cor osion;

— depth of ext ernal cor osion;

— mains con ition/ fai ur (e.g scoring, deformation);

— int ernal deposit ;

— cont ext data;

— o e ating pr s ur fluctuations (minimum an ma imum v lues);

— ambient t empe atur ;

— ac uracy of met ering, control ng -r lat ed devic s

Cont ext data pro ide t echnical information a out the local in the vicinity of a drinking wat er network

as et, b an larg e cor esp n ing t o the cont ent of Ta le 3

Table 3— Examples of co text data

C nt ext data at ribut e

Distance t o long -haul traff ic routes (e.g A-ro ds an

mot orways, railway lines)

X should be man atory;

O should be optional;

— not ap lc ble;

ID identific tion n mber of an as et

C nt ext data at ribut e

X should be man atory;

O should be optional;

— not ap lc ble;

ID identif ic tion n mber of an as et

5.5 Data reg ister ing and data as ig nment

5.5.1 Data reg ister ing

The st or d data should beche ked an updat ed pe iodicaly or a pro riat ely

The data t o be r gist er d as defined in 5.4 should be compied, int egrat ed, proc s ed an cor e tly

st or d b the uti ity They form the b sis for develo ing maint enanc plans an s rat egies

The data cole tion proc s it elf det ermines the v lue of the data for as et maint enanc The data

should r lat e t o theas et ’ invent ory ( e ex mples in Ta les 2 an 3) The data ’ s v lue inc eases in lne

with it q antity and q alty r gist er d an with the p s ibi ty t o as ign in ivid al pie es of data t o

the r spe tive drin ing wat er networks /o je t (as et )un e conside ation

Ta le 2a ples t o the invent ory data w hich should be r gist er d, w he eas 5.4.3an 5.4.4 a ply t o faiur

an othe con ition data t o be r gist er d C nt ext data in ac ordanc with Ta le 3 should be r gist er d

for in ivid al o je t in ac ordanc with Ta le 2(lne or sp t o je t ) In c rtain sup ly ar as, howeve ,

it is also r commen ed t o r gist er two-dimensional y, in w hich case they should be clearly r fe enc d

t o thein ivid al o je t desc ibed in Ta le2

Data cole tion should be compr hensive, contin ous an fr e from int erpr tation Data r gist er d for

one sup ly ar a an / r uti ty should be u iform an b sed on pr viously an u ambiguously def ined

default v lues (“ multiple choic ” Fr e t ext should be a oided be ause it ofe s only l mit ed ev luation

p s ibi ities

Unl ke invent ory, fai ur or cont ext data, othe con ition data (an , ac ordingly, pipelne analy ses) can

be r gist er d only d ring the visual inspe tion of buried pipelne se tions u les cathodic prot ection

measur ment ar inv lved To this en , uti ties should a ai themselves of the o p rtu ities ofe ed

b ex ca ations ac omp nying work on pipel ne networks or civi engine ring works cond ct ed b

third p rties Othe con ition data should be r gist er d nota ly d ring r medial activities Des ructive

t es ing ma also be pe formed (e.g brit lenes of plas ic mat erials)

Data col e tion ma be pe formed using eithe mo i e data col e tion devic s or forms t o be f iled in

man aly (pr fe a ly b x-ticking forms) It should be ensur d that al data can be digital y a gr g t ed

in one plac or sy st em

5.5.2 Data as ig nment

Al invent ory, con ition an cont ext data r gist er d should be cor e tly as igned t o the as ociat ed

as et ty es (e.g P 1 0 pipes or v lves) an / r in ivid al as et F aiur on v lve b dies, for ex mple,

should not be as igned t o pipelne data Likewise, faiur data should be r gist er d in such a wa as t o

ena le the r tro ctive elmination of event not r lev nt for maint enanc , e.g pipe damag e caused b

third-p rty int erfe enc

Table 3 (c ontin ed)

Invent ory an condition data can be used for devising a r ha i tation plan ing an s rat eg , depen ing

on the o je t t o w hich they ar as igned ( e Ta le 4)

Table 4 — Usabi ity of inventory, co ditio an co text data depending o the o ject (as et) to

w hich they are as igned

X should be man atory;

O may be optional;

— may be not ap lc ble only if ex ceptional

5.5.3 Geo-r eferencing

Using the a o e-mentioned data ases for medium- an short-t erm r ha i itation plan ing r q ir s

g eo-r fe encing an the unambiguous as ignment of data r cords t o their as ociat ed o je t Using

sele t g eo-r fe encing con ition an cont ext data can pro ide important information w hen def ining a

r ha i itation s rat eg

Ca turing data in g eo-r fe encing sy st ems (GIS, network information sy st ems, comput er network

models, et c ) is the bes a pro ch for proc s ing an using maint enanc -r lat ed data If the data ar

as igned only t o pipel ne or mat erial groups inst ead of in ivid al pipelne se tions, location-r lat ed

information (for ex mple, a out environment con itions) is r n e ed useles for r ha i tation planning

purp ses even if such information is a aia le R efe enc t o in ivid al as et as wel asg eo-r fe encing

information should be pr se ved even w hen in ivid al as et ha e c ased t o form p rt of a cur ently

exis ing network Hist orical data also sup ly important information for devising a r ha i tation

s rat eg

5.6 Review of ex isting infor mation

The cole tion an r view of al a aia le r lev nt information a out the drin ing wat er network should

be car ied out an ar the b sis from w hich al othe activities ar subseq ently plan ed

A r view should also be un e taken of the information r q ir d t o manag e the drinking wat er network

This information should be as es ed t o det ermine w hat furthe information is r q ir d in orde t o

car y out the inves ig tion

5.7 Inventor y update

Whe e the invent ory is incomplet e, it should be updat ed so that a suff icient r cord of the network is

a ai a le t o car y out the inves ig tion

NOTE T e u date of the other information is inclu ed in the hydraulic, en ironmental, structural an

operational investig tions