IS 7323: Operation of reservoirs - Guidelines

21 Pages·1994·2.1 MB·English

by  Bureau of Indian Standards

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IS 7323 (1994): Operation of reservoirs - Guidelines [WRD
10: Reservoirs and Lakes]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
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“Knowledge is such a treasure which cannot be stolen”

IS 7323 : 1994
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Indian Standard
OPERATIONOFRESERVOIRS -GUIDELINES
( First Revision )
UDC 627-S l-004

@ BIS 1994
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

November 1994 Price Group 7
sriovreseR lanoitceS ,eettimmoC RVD 4
FOREWORD
sihT naidnI dradnatS ( tsriF noisiveR ) was detpoda yb eht uaeruB fo naidnI Standards, retfa eht
tfard dezilanif yb eht sriovreseR lanoitceS eettimmoC had neeb devorppa yb eht reviR yellaV
noisiviD .licnuoC
,retaW a rojam larutan ,ecruoser is desu rof elpitlum uses as ,noitagirri rewop ,noitareneg
,noitagivan ,cte sediseb lairtsudni and citsemod .sdeen ehT main ecruos fo ytilibaliava fo retaw
is eht ecafrus ffo-nur ni eht mrof fo .srevir ehT wolf ni eht revir segnahc yllanosaes and morf
raey ot ,raey eud ot laropmet and spatial noitairav ni .noitatipicerp ,suhT eht retaw elbaliava
yltnadnuba gnirud noosnom ,nosaes semoceb ecracs 2.nirud eht noosnom-non ,nosaes nehw ti is
tsom .dedeen ehT lanoitidart dohtem dewollof ylnommoc rof gniteem eht sdeen fo retaw gnirud eht
ecracs doirep is noitcurtsnoc fo egarots riovreser no revir .esruoc ehT ssecxe retaw gnirud eht
noosnom nosaes is derots ni hcus sriovreser rof lautneve esu ni nael .doirep noitcurtsnoC fo
segarots lliw osla pleh ni lortnoc fo ,doolf as llew as noitareneg fo cirtcele .rewop oT teem eht
evitcejbo tes htrof ni planning a riovreser ro a puorg fo sriovreser and ot eveihca mumixam stifeneb
tuo fo eht egarots ,detaerc ti is evitarepmi ot evlove senilediug rof noitarepo fo .sriovreser tuohtiW
reporp noitaluger ,seludehcs eht riovreser yam ton teem eht lluf evitcejbo rof hcihw ti was dennalp
and yam osla esop regnad ot eht erutcurts .flesti
lortnoC fo doolf is retteb deveihca fi eht riovreser level is tpek wol ni eht ylrae stages fo eht
noosnom .nosaes ,revewoH at a retal ,egats fi eht detapicitna swolfni od ton ,tluser eht riovreser
yam ton teg dellif up yletauqeda rof gniteem eht suoirav retaw .sdnamed On eht rehto hand,
if
eht riovreser is dellif up ot LRF ni eht ylrae stages fo ,noosnom ot diova eht risk fo riovreser
gniniamer dellifnu at retal ,egats ereht yam eb melborp fo gnitadommocca hgih sdoolf gnirrucco
at retal .egats nI emos sesac elihw planning ,sriovreser laicos and rehto snoitaredisnoc
yllanoisacco tluser ni noitpoda fo a plan that yam ton eb yllacimonoce eht .tseb gniredisnoC all
eseht issues, ti is desoporp ot yal nwod lareneg senilediug rof noitaluger fo ,sriovreser hguoht ti
yam ton eb elbissop ot revoc all sepyt fo .sesac
sihT naidnI dradnatS was tsrif dehsilbup ni 1974. ecniS neht elbaredisnoc stnempoleved ni eht
seuqinhcet fo riovreser snoitarepo evah nekat .ecalp ehT tpecnoc fo noitarepo fo riovreser
gniredisnoc ti as a elgnis ytitne has nevig yaw ot eht tpecnoc fo detargetni noitarepo fo .sriovreser
noitacilppA fo metsys gnireenigne ,sdohtem hcus as lacitamehtam noitasimitpo and noitalumis

era won gnieb ylgnisaercni desu rof ,gninifed noitaulave and noitceles fo riovreser noitarepo

.seicilop elbaredisnoC snoitatnemucod no eht tcejbus fo metsys sisylana seuqinhcet ni retaw
secruoser planning era osla .elbaliava ehT tneserp noisiver has neeb nekat up ot etaroprocni all
hcus tsetal .seuqinhcet
IS 7323: 1994
Indian Standard
OPERATIONOFRESERVOIRS -GUIDELINES
( First Revision )
1 SCOPE 2.6 Dry ( Bad ) Year
1.1 sihT dradnats sedivorp emos tnatropmi A raey gnirud hcihw the noitatipicerp or maerts
cisab senilediug for the noitarepo of sriovreser wolf si ssel naht that ni the lamron .raey
ni order ot eveihca mumixam stifeneb tnetsisnoc
htiw rieht lacisyhp scitsiretcarahc dna snoitcnuf 2.7 Filling Period
for hcihw yeht are dennalp dna .detcurtsnoc
ehT doirep gnirud hcihw wolfni otni the
1.2 esehT senilediug are daorb noitasilareneg riovreser si ylekil ot eb erom naht the water
ylno dna are evitacidni ni .erutan roF lautca dnamed dna the sulprus wolf si dednuopmi ot
noitarepo of riovreser or a metsys of ,sriovreser dliub pu the storage.
laudividni noitaluger seludehcs are deriuqer ot
eb ,detalumrof after gniredisnoc lla lacitirc 2.8 Flood Control Storage
factors .devlovni
Storage space dedivorp ni the riovreser for
2 YGOLONIMRET gnirots doolf water yliraropmet ni order ot
ecuder peak egrahcsid dna ot eziminim gnidoolf
2.0 roF the esoprup of siht ,dradnats the -wollof
of maertsnwod .snoitacol
gni snoitinifed llahs .ylppa
2.1 Carry Over Storage 2.9 Full Reservoir Level ( FRL )
ehT tsehgih riovreser level hcihw nac eb
Storage tfel revo ni a riovreser at the dne of the
deniatniam tuohtiw yawllips egrahcsid or
noitelped doirep of a ,raey hcihw si elbaliava
tuohtiw gnissap water hguorht rednu .seciuls
for esu ni retal .sraey sihT storage si osla dellac
sihT level si osla dellac tsehgih dellortnoc
revO‘ Year Storage’.
water .’level
2.2 Conservation Storage
2.10 decudnI egrahcruS epolevnE evruC
retaW dednuopmi ni a riovreser for -resnoc
lanoitav sesu hcus as ,noitagirri power sihT si a evruc gnitneserper the mumixam water
,noitareneg lairtsudni ,esu lapicinum ,ylppus level that dluow eb dewolla ni a ,riovreser at

etc. tnereffid rates of yawllips ,segrahcsid nehw
gnitarepo rednu the decudni egrahcrus .nalp
2.3 Dead Storage sihT evruc si nward morf a ,tniop gnidnopserroc
Storage woleb the tsewol teltuo level of a ot the mumixam elbissimrep doolf lortnoc
,riovreser hcihw si ton elbitpecsus ot esaeler yb esaeler at the ,LRF ot a tniop gnidnopserroc ot
lausu teltuo .snaem the noitavele nehw lla yawllips gates are ylluf
.denepo
2.4 Depletion Period
ehT doirep gnirud hcihw elbaliava storage ni 2.11 decudnI egrahcruS Storage
the riovreser si desaeler or detelped for gniteem
ehT storage neewteb the lluf riovreser level
suoirav water .sdnamed sihT doirep seil edistuo
( LRF ) dna the mumixam water level ( LWM )
the gnillif doirep of a .raey
of a ,riovreser hcihw yam eb decudni yb
2.5 Design Flood/Reservoir Design Flood gnitaluger the wolftuo rates, after the riovreser
si dellif pu ot the .LRF
ehT edutingam of doolf adopted for ngised
esoprup si dellac ngised .doolf tI yam eb the
2.12 Live Storage
elbaborp mumixam doolf ( FMP ) or the
dradnats tcejorp doolf ( FPS ) or a doolf Storage yticapac neewteb the tsewol teltuo
gnidnopserroc ot emos derised ycneuqerf of level of riovreser or muminim nwodward level
,ecnerrucco gnidneped no the epyt of erutcurts ( MDDL ) ot the tsehgih dellortnoc water level
dna the tnetxe of detaluclac ks’ir the rengised or lluf riovreser level ( LRF ). sihT storage si
si prepared ot accept. osla dellac eviL‘ .’yticapaC
IS 7323 : 1994
eb detarepo ni an detargetni rennam rof
2.13 Maximum Water Level ( MWL )
mumitpo noitasilitu fo eht retaw secruoser
ehT level ylekil ot eb deniatta ni a riovreser at fo eht revir .metsys
eht dam ,ecaf elihw gnitaitogen eht detpoda
ngised .doolf ehT level is osla dellac tsehgiH‘
4 PRINCIPLES OF OPERATION OF
doolf ,’level yawllipS< ngised doolf ’level ro
RESERVOIRS
mumixaMc retaw ecafrus .’noitavele
4.1 gniwolloF era emos fo eht nommoc -icnirp
2.14 Minimum Draw-Down Level ( MDDL ) selp fo riovreser .noitarepo
tI is eht tsewol level up ot hcihw eht riovreser
4.1.1 Siylgle Purpose Reservoirs
yam eb detelped rof gniteem suoirav .sdeen nL
a>
rewop ,stcejorp sesaeler era elbawolla up ot doolF control - noitarepO fo doolf lortnoc
LDDM ylno daetsni fo daed egarots ,level os sriovreser is yliramirp denrevog yb eht
as ot maintain eht muminim daeh deriuqer rof elbaliava doolf egarots ,yticapac egrahcsid
rewop .noitareneg yticapac fo ,steltuo rieht noitacol and
erutan fo egamad sertnec ot eb ,detcetorp
2.15 lamroN ( egarevA ) raeY doolf ,scitsiretcarahc ytiliba and ycarucca
fo mrots/doolf tsacerof and ezis fo eht
A raey gnirud hcihw eht noitatipicerp ro maerts dellortnocnu eganiard .aera A noitaluger
wolf era nihtiw + 20 tnecrep fo eht gnol doirep plan ot revoc all eht detacilpmoc
egareva .eulav snoitautis yam eb tluciffid ot ,evlove tub
yllareneg ti dluohs eb elbissop gnidrocca
2.16 riovreseR gnituoR
ot eno fo eht gniwollof :selpicnirp
doolF gnituor is a ssecorp fo gninimreted
yllaciteroeht eht wolftuo nrettap morf ,sriovreser 1) EfSective use of availabIe flood control
rof yna nevig nrettap fo ,wolfni egarots and storage - noitarepO rednu this
liat retaw .noitidnoc elpicnirp aims at gnicuder doolf
damages fo eht snoitacol ot eb
2.17 eluR evruC detcetorp ot eht mumixam tnetxe
,elbissop yb evitceffe esu fo doolf
eluR evruc is eht tegrat level dennalp ot eb lortnoc egarots yticapac elbaliava at
deveihca ni a ,riovreser rednu tnereffid eht emit fo hcae doolf .tneve ecniS
snoitidnoc fo seitilibaborp fo swoltni ro/dna eht esaeler rednu this plan dluow
,sdnamed gnirud suoirav emit doirep ni a .raey ylsuoivbo eb rewol than esoht deriuqer
rof gnillortnoc eht riovreser ngised
2.18 Wet ( Good ) Year
,doolf ereht is tcnitsid ytilibissop fo
A raey gnirud hcihw eht noitatipicerp ro maerts gnivah a noitrop fo eht doolf lortnoc
wolf is erom than that ni eht lamron .raey ecaps deipucco gnirud eht ecnerrucco
fo a tneuqesbus yvaeh .doolf nI redro
3 CLASSIFICATION OF RE SERVOIRS ot ecuder this tnemele fo risk, -etniam
ecnan fo an etauqeda krowten
roF eht esoprup fo ,noitaluger sriovreser era of
gnitsacerof snoitats htob ni eht
deifissalc otni gniwollof :sepyt flood
maertspu and maertsnwod aaera
)a Single Purpose Reservoirs dluow eb yletulosba .yrassecen
esehT sriovreser era depoleved ot evres )2 Control qf reservoir design flood -
ylno eno ,esoprup hcihw yam eb doolf gnidroccA ot this ,elpicnirp sesaeler
lortnoc ro yna fo eht noitavresnoc uses morf doolf lortnoc sriovreser detarepo
hcus as ,noitagirri rewop ,noitareneg no this tpecnoc era edam no eht emas
,noitagivan lairtsudni ,esu lapicinum sisehtopyh as detpoda rof gnillortnoc
retaw ,ylppus .cte eht riovreser ngised ,doolf that is eht
lluf egarots yticapac dluow eb dezilitu
)b Multi-purpose Reservoirs ylno nehw eht doolf spoleved otni the
riovreser ngised .doolf ,revewoH as
esehT sriovreser era depoleved ot evres
eht ngised doolf is yllausu an emertxe
erom than eno esoprup hcihw yam eb a
,tneve noitaluger fo ronim and rojam
noitanibmoc fo yna fo eht noitavresnoc
,sdoolf hcihw rucco erom netfo is less
uses htiw ro tuohtiw doolf .lortnoc
yrotcafsitas nehw this dohtem is
)c System of Reservoirs .deilppa
esehT tsisnoc fo a puorg fo /elgnis )3 Combination of principIes )1( and -)2(
elpitlum esoprup ,sriovreser hcihw yam nI this ,dohtem a noitanibmoc fo eht
2
: 4991
IS 1323
selpicnirp (1) dna (2) si .dewollof ,lW:h si yllareneg referred ot as llips
The elpicnirp ( 1 ) si dewollof for .enoz sihT space si deipucco yltsom
the rewol noitrop of the doolf gnirud hgih sdoolf dna the sesaeler morf
evreser ot eveihca the mumixam siht enoz are ffo-edart neewteb larutcurts
stifeneb yb gnillortnoc the reilrae part ytefas dna maertsnwod doolf .segamad
of the .doolf retfaerehT sesaeler are
edam as deludehcs for the riovreser b) Flood control zone - sihT si the storage
space dekramrae as yraropmet storage
ngised doolf as ni elpicnirp ( 2 ). nI
for gnibrosba hgih swolf for gnitavella
tsom cases siht nalp lliw tluser ni the
maertsnwod doolf .segamad sihT dluohs
tseb llarevo ,noitaluger as ti senibmoc
eb space deitpme as noos as elbissop ot
the good stniop of htob the .sdohtem
etaitogen txen doolf .tneve
4) Flood control in emergencies -- tI si c>
elbasivda ot prepare na ycnegreme Conservation zone - sihT storage space si
desu for noitavresnoc of water for
esaeler eludehcs that sesu noitamrofni
gniteem suoirav erutuf .sdnamed sihT
riovreser data yletaidemmi
on enoz si yllareneg neewteb LRF dna dead
elbaliava ot the operator. hcuS
storage .level
eludehcs dluohs eb elbaliava htiw the
operator ot elbane mih ot ylpmoc 4 Buffer ZOHP- - sihT si the storage space
htiw yrassecen snoituacerp rednu evoba dead storage level hcihw si desu ot
emertxe doolf .snoitidnoc yfsitas ylno yrev laitnesse water sdeen ni
case of emertxe .noitautis
)b Conservation -- sriovreseR tnaem for
e>
noitatnemgua of seilppus gnirud nael Dend storage zone -- sihT si osla dellac
doirep dluohs yllausu eb operated ot llif evitcani .enoz sihT si the tsewol enoz
as ylrae as elbissop gnirud gnillif ,doirep ni hcihw the storage si tnaem ot brosba
elihw gniteem the .stnemeriuqer llA emos of the stnemides gniretne otni the
.water ni excess of the stnemeriuqer of .riovreser ehT storage ni siht enoz si ton
the gnillif doirep llahs eb .dednuopmi No elbitpecsus ot esaeler yb the tliub-ni
gnillips of water revo the yawllips lliw teltuo .snaem
yllamron eb dettimrep litnu the LRF si
reached. dluohS yna doolf rucco nehw 4.1.2.2 ehT lareneg selpicnirp of noitarepo of
the riovreser si at or raen the ,LRF sriovreser htiw these elpitlum storage spaces
esaeler of doolf sreta;v dluohs eb affected, are debircsed :woleb
so as ton ot exceed the egrahcsid that
dluow evah derrucco had there neeb on a) Separate allocation of capacities -- nehW
.riovreser nI case the raey sneppah ot eb separate snoitacolla of yticapac evah
,yrd the draft for gnillif doirep dluohs eb neeb edam for each of the lanoitavresnoc
deliatruc yb gniylppa elbatius factors. ,sesu ni noitidda ot that deriuqer for
doolf ,lortnoc noitarepo for each of the

ehT noitelped doirep dluohs nigeb -ereht noitcnuf llahs wollof the selpicnirp of
after. ,revewoH ni case the riovreser si evitcepser .snoitcnuf ehT storage
dennalp htiw revo-yrrac ,yticapac ti si elbaliava for doolf lortnoc ,dluoc -woh
yrassecen ot erusne that the noitaluger ,reve eb desilitu for noitareneg of
lliw edivorp the deriuqer revo-yrrac yradnoces power ot the tnetxe .elbissop
yticapac at the dne of the noitelped noitacollA of cificeps storage space ot
.doirep lareves sesoprup nihtiw the noitavresnoc
enoz yam semitemos eb elbissopmi or
4.1.2 Multi-purpose Reservoirs yrev yltsoc ot edivorp water for the
4.1.2.1 noitarepO of a esoprup-itlum riovreser suoirav sesoprup ni the seititnauq dedeen
dluohs eb denrevog yb the rennam ni hcihw dna at the emit yeht are .dedeen
suoirav sesu of the riovreser evah neeb
b) Joint use of storage space - nI -itlum
.denibmoc elihW gnitarepo the sriovreser ot
esoprup riovreser where tnioj esu of emos
teem the sdnamed of dne ,sresu the seitiroirp
of the storage space or storage water has
for noitacolla yam eb desu as a .enilediug nI
neeb ,degasivne noitarepo semoceb
lareneg evif cisab senoz of riovreser space yam
detacilpmoc eud ot gnitepmoc dna
eb desu ni gnitarepo a riovreser for suoirav
gnitcilfnoc .sdnamed elihW doolf lortnoc
.snoitcnuf lacipyT storage snoitacolla for
seriuqer wol riovreser ,level noi.tavresnoc
suorrav sesu are detacidni ni .giF .I ehT suoirav
stseretni eriuqer as hgih a level as si
storage senoz netfo deifitnedi :era
.elbaniatta ,suhT the sevitcejbo of these
a) Spill zone - Storage space evoba the snoitcnuf are ton elbitapmoc dna a
doolf lortnoc enoz neewteb LRF dna esimorpmoc lliw evah ot eb effected ni
3
IS 9323 : 1994
FIG. 1 RESERVOIRS TORAGEA LLOCATIONZ ONES
doolf lortnoc snoitarepo yb gnicifircas sriovreser ot eveihca mumitpo noitasilitu fo eht
eht stnemeriuqer fo eseht .snoitcnuf nI retaw secruoser elbaliava and ot tifeneb tseb
emos sesac parts of eht lanoitavresnoc tuo fo eht riovreser .metsys
egarots ecaps is dezilitu rof doolf -aredom
,noit gnirud eht reilrae stages fo eht 4.1.3.1 nI eht noitaraperp fo noitaluger plans
.noosnom sihT ecaps has ot eb dellif up rof an detargetni noitarepo fo metsys fo
rof noitavresnoc sesoprup sdrawot eht ,sriovreser selpicnirp elbacilppa ot etarapes
dne fo noosnom ,ylevissergorp as ti thgim units era tsrif deilppa ot eht laudividni -reser
ton eb elbissop ot llif up this ecaps .sriov snoitacifidoM fo seludehcs os depoleved

gnirud eht noosnom-tsop ,sdoirep nehw dluohs neht eb deredisnoc yb gnikrow tuo
eht swolf era tneiciffusni neve ot teem eht lareves evitanretla plans. nI eseht seiduts
tnerruc .stnemeriuqer sihT lliw yllarutan noitasimitpo and noitalumis seuqinhcet yam eb
evlovni emos ecifircas fo eht doolf lortnoc ylevisnetxe desu htiw eht noitacilppa fo
stseretni sdrawot eht dne fo eht -nom sretupmoc ni retaw secruoser .tnempoleved ehT
.noos elpicnirp serutaef yllausu deredisnoc rof -etni
detarg noitarepo ,fo sriovreser era nevig
4.1.2.3 ehT tpecnoc fo tnioj esu fo egarots
,ecaps htiw lanoitarepo airetirc ot esimixam :woleb
eht yratnemelpmoc stceffe and ot eziminim eht a>
Flood control regulation - ehT esiw-nisab
evititepmoc stceffe seriuqer luferac .ngised
doolf snoitidnoc era ,deredisnoc rehtar
hcuS ,stpecnoc fi dengised ,ylreporp era reisae
than eht noitidnoc fo eht laudividni sub-
ot eganam and lliw edivorp retteb ecivres rof
basins. ehT ycnapucco fo doolf sevreser
all .stnemeriuqer With eht tnemecnavda fo
ni hcae fo eht ,sriovreser noitubirtsid fo
metsys sisylana ,seuqinhcet ti is .ysae won ot
sesaeler gnoma eht sriovreser and -knab
ylluferac ngised eht tnioj esu ni a esoprup-ttlum
lluf stages at lacitirc snoitacol dluohs eb
.riovreser
deredisnoc .ylsuoenatlumis roF ,ecnatsni
fi a noitcuder ni swolftuoJ is ,deriuqer ti
4.1.3 System of Reservoirs dluohs eb edam morf eht riovreser
nI metsys fo ,sriovreser ti is yrassecen gnivah eht tsael yticapac deipucco
case of
rof detargetni noitarepo fo ro has eht rellams doolf ffo-nur
to adopt a strategy
4
IS 7323 : 1994
morf sti eganiard area. fI na esaercni ni snoit ot eb protected, noitarepo rednu
esaeler si ,elbissop ti dluohs eb edam elpicnirp ( 1 ) of 4.1.1 ( a ) dluohs
morf the riovreser where the egatnecrep tsisnoc of gnipeek the egrahcsid at the
ycnapucco si the tsehgih or ylevitaler a egamad ertnec nihtiw the tsehgih
rehgih of doolf s iffo-nur .gnirrucco elbissimrep stage or ot erusne ylno
a muminim noitubirtnoc morf the
rehgiH sesaeler morf sriovreser gniviecer dellortnoc area nehw evoba siht stage.
evissecxe doolf ffo-nur yam eb suht noitarepO rednu siht elpicnirp smia
retnuoc ,decnalab ylralucitrap ni cases of at gnicuder the gnigamad doolf stages
detalosi ,smrots yb gnicuder sesaeler at the noitacol ot eb protected ot the
morf sriovreser gniviecer ylevitaler ssel mumixam tnetxe elbissop htiw the
.ffo-nur doolf lortnoc storage yticapac
elbaliava at the emit of each doolf
b) Conservation regulation - ehT tnerritc .tneve nI order ot hsilpmocca siht
water sdnamed for suoirav ,sesoprup the
,tluser ti si laitnesse ot evah na
elbaliava noitavresnoc storage ni
etarucca forecast of doolf swolf otni
laudividni sriovreser dna the noitubirtsid
the riovreser dna the lacol swolfni
of sesaeler gnoma the ,sriovreser dluohs
otni the maerts woleb ti for a doirep
eb deredisnoc ot poleved a detanidro-oc
of emit tneiciffus ot llif na ytpme
nalp ot ecudorp the mumitpo stifeneb dna
.riovreser sihT si ylsuoivbo na laedi
eziminim water sessol eud ot noitaropave
case. tI si tluciffid ot forecast ylbailer
dna .noissimsnart
dna ylesicerp ni evitatitnauq smret the
.llafniar ,suhT there si syawla the
5 NOITARAPERP FO ELUR SEVRUC ksir of gnicaf ytluciffid ni noitaluger
of ffo-nur morf tneuqesbus ,smrots
5.0 A elur evruc si yllareneg desab no deliated
nI order ot ecuder siht tnemele of
laitneuqes sisylana of suoirav lacitirc -anibmoc
,ksir ecnanetniam of na etauqeda
snoit of lacigolordyh snoitidnoc dna water
krowten of doolf gnitsacerof snoitats
.sdnamed esehT dluohs eb prepared ni
htob ni the maertspu dna maertsnwod
ecnadrocca htiw the selpicnirp debircsed ni 4
area of the tcejorp semoceb yletulosba
dna dluohs etacidni riovreser slevel dna sesaeler
.yrassecen oT tnuocca for the
gnirud tnereffid semit of the ,raey gnidulcni
ylniatrecnu ni gnitsacerof the ,swolf
lanoitarepo .seicilop eluR sevruc ecno prepared
the forecasted swolf yam eb -itlum
dluohs eb yltnatsnoc deweiver ,dna fi ,yrassecen
deilp yb a ycnegnitnoc factor for
deifidom so as ot evah the tseb noitarepo of the
gnivirra at esaeler .noisiced ehT
.sriovreser
ycnegnitnoc ecnawolla dluohs eb
greater naht eno for doolf lortnoc
5.0.1 ehT lanoitarepo snoisiced are desab no
dna ssel naht euo ni case of -resnoc
the tnerruc state of the metsys dna emit of the
.noitav
,raey hcihw tnuocca for the lanosaes noitairav

dluof ohs the riovreser esab the esaeler .swolfni of the A elpmis txen emit elur dcirep evruc 2) Principle ( 2 ) of 4.1.1 ( a ) - ehT
noitarepo seludehcs desab no elpicnirp
ylelos no the tnerruc storage level dna the
(2 ) of 4.1.1 ( a ) dluohs tsisnoc of
tnerruc emit doirep of the .raey A erom
sesaeler demussa for ngised doolf
xelpmoc elur evruc dluohs redisnoc storages ni
,snoitidnoc that ngised doolf dluoc
other ,sriovreser cificeps maertsnwod lortnoc SO
eb dellortnoc tuohtiw gnideecxe the
stniop dna the forecasted swolfni otni the
doolf lortnoc .yticapac ehT noitarepo
.riovreser
stsisnoc of gnigrahcsid a dexif ,tnuoma
hcihw yam eb tcejbus ot detaicossa
5.1 Single Purpose Reservoirs
,doolf storage dna wolftuo ,snoitidnoc
a) Flood Control -- nehW the protected area hcus that lla evisseexe swolfni are
seil yletaidemmi maertsnwod of the stored as gnol as gnidoolf seunitnoc
,riovreser the doolf lortnoc seludehcs at deificeps .snoitacol
dluow tsisnoc of gnisaeler lla swolfni pu
ot the safe lennahc .yticapac ehT -icnirp 3) Combination of Principles - nehW
htob lacol dna etomer snoitacol are
selp dewollof ni lla cases are the emas
ot eb protected, seludehcs desab no
as nevig ni 4.1.1 (a) dna are deliated
the noitanibmoc of selpicnirp ( 1 )
:woleb
dna ( 2 ) are yllausu erom -silas
1) elpicnirP (2) 0f4.1.1 (a) nehW- there .yrotcaf nI siht ,dohtem elpicnirp
si elbaicerppa dellortnocnu eganiard ( 1 ) that ,si laedi‘ ,’noitarepo yam
area neewteb the mad dna the -acol eb dewollof ot lortnoc the reilrae
5