[PPT] - Cape T own Wate r Outlook 2018 Upda te d 20 July 2018 De pa rtme PowerPoint Presentation

SLIDE 1

Cape T

wn Wate r

Outlook 2018

Upda te d 20 July 2018 De pa rtme nt o f Wa te r a nd Sa nita tio n City o f Ca pe T

wn

SLIDE 2

Ove r vie w

2018 ra infa ll to da te a nd b a la nc e o f se a so n fo re c a st
I

mpa c t o n da ms a nd ra infa ll sc e na rio s

Wha t ha s c ha ng e d in ma na g ing de ma nd & supply?
T
o e a rly to re la x – imple me nt re c o ve ry pla n to pro vide re lie f witho ut c o mpro mising

wa te r se c urity

Re stric tio ns, de ma nd ma na g e me nt initia tive s, re duc e d de ma nd & diminishing re turns
WCWSS rule s a nd re c o nc ilia tio n stra te g y a ppro a c h
Pro viding a ssura nc e o f wa te r supply
Aug me nta tio n c o nside ra tio ns - de te rmining o ptima l a ug me nta tio n vo lume s, timing ,

so urc e , c o st, re spo nsib ility

E

xisting , c o mmitte d a nd future a ug me nta tio n o ptio ns

Summa ry o f c urre nt wa te r o utlo o k

SLIDE 3

Rainfall in May & June in WCWSS appr

ximate ly ave r

age

SLIDE 4

SAWS Rainfall outlook Q3 2018

1. E l Nino / So uthe rn Osc illa tio n (E NSO) is in a ne utra l pha se . 2. L a te st fo re c a sts indic a te a hig h like liho o d (a lmo st a 50% pro b a b ility) o f the de ve lo pme nt o f a n E l Nino e ve nt during spring a nd summe r. 3. I t is still to o e a rly to pre dic t its e xa c t o utc o me during summe r. 4. I t is a dvise d tha t this syste m b e mo nito re d in the ne xt fe w mo nths to de te rmine its impa c t o n the summe r-ra infa ll a re a s. 5. During Jul-Aug -Se p the re a re susta ine d, a lmo st c o untrywide indic a tio ns fo r a b o ve -no rma l ra infa ll, b ut the re is still no c o nfide nc e fo r this pe rio d. 6. T he re is ho we ve r indic a tio ns o f drie r c o nditio ns a lo ng pa rts o f the so uth c o a st, with c o nfide nc e , during Aug -Se p-Oc t a nd Se p-Oc t-No v. 7. Ove ra ll, hig he r tha n no rma l te mpe ra ture s a re e xpe c te d to wa rds Spring a nd b e yo nd. T he re is a pa rtic ula rly hig h c o nfide nc e fo re c a st fo r a b o ve -no rma l te mpe ra ture s o ve r the no rthe rn pa rts o f the c o untry.

(a s a t 10 July 2018)

SLIDE 5

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 110%

100 000 200 000 300 000 400 000 500 000 600 000 700 000 800 000 900 000 1 000 000

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018

2017 2016 2015 46.5% 31.0% 55.4% 84.1% 2018 2014 38.4% 60.3% 71% 97%

Hydr

logic al ye ar

Star t 1 Nov

Da m le ve ls ~29% tha n in 2017 CT L 2

CT L 3 CT L 4 CT L 4B CT L 5 CT L 6 CT L 6B DWS 20% DWS 45/ 60%

Ave r age r ainfall signific antly r aise d dam le ve ls – 55.8% as at 19 July 2018

SLIDE 6

0% 10% 20% 30% 40% 50% 60% 70% 80% 90%

01-JAN-18 01-FEB-18 01-MAR-18 01-APR-18 01-MAY-18 01-JUN-18 01-JUL-18 01-AUG-18 01-SEP-18 01-OCT-18 01-NOV-18 01-DEC-18 01-JAN-19 01-FEB-19 01-MAR-19 01-APR-19 01-MAY-19 01-JUN-19 01-JUL-19 01-AUG-19 01-SEP-19 01-OCT-19

2017 rainfall 50% of 2017 rainfall Average rainfall Wet winter

T he impac t of r ainfall on dam le ve ls if c ur r e nt r e str ic tions r e main

2017 ra infall 50% of 2017 ra infall L

ng te rm ave rage rainfall

Ac tual dam le ve ls We t winte r 31 Oc t e nd of hydr

logic al ye ar

Dr awdown will var y de pe nding on r e str ic tion le ve l impose d by DWS Pr

pose d CAPE

T OWN r e str ic tion le ve ls will de pe nd on r e str ic tions pr e vailing in the WCWSS

SLIDE 7

What happe ne d to Day Ze r

? / Dr
ught Monitor

ing - 2018 Hydr

logic al Ye ar
T

he Da y Ze ro mo nito rpro vide d fo r da m le ve ls b e lo w 40%, b a se d o n ra infa ll simila r to 2017.

I

n lig ht o f impro ve d da m le ve ls, the City is e xplo ring

inc r e me ntal r e duc tion of r e str ic tions to pro vide re lie f to c o nsume rs while no t

c o mpro mising wa te rse c urity.

SLIDE 8

Dam le ve ls > in 2015: How has this c hange d what we do?

Still to o e a rly to re la x
Dro ug ht ma na g e me nt mo ving to a re c o ve ry pha se
F
c us o n lo ng -te rm re silie nc e
E

nsure le sso ns fro m the dro ug ht a re use d to e nsure wa te r se c urity g o ing fo rwa rd

F
rma lise wa te r stra te g y a s it re la te s to wa te r supply & de ma nd, re silie nc e & a da pta tio n, g o ve rna nc e , fina nc ia l

susta ina b ility

De mand

Ro lling o ut o f pre ssure ma na g e me nt zo ne s will

c o ntinue until a ll po ssib le zo ne s a re c o mple te d. Pre ssure s a re linke d to re stric tio n le ve ls;

Wa te r ma na g e me nt de vic e s will still b e insta lle d in

a lig nme nt with re stric tio n le ve ls b ut a t a re duc e d pa c e ;

T

a riffs will re ma in in pla c e until re stric tio n le ve ls a re re duc e d a nd ne e d to c o mpe nsa te fo r b o unc e -b a c k unc e rta intie s;

Co mmunic a tio n c a mpa ig ns will c o ntinue , to e nsure

re spo nsib le wa te r use .

Supply

Ma na g ing da m syste m o ptima lly a c c o rding to syste m

r ule s;

Ma na g ing c a tc hme nts inc luding c le ar

ing alie n ve ge tation;

Re vie wing le ve l o f de sir

e d supply assur anc e fo r the

City (c urre ntly 1:50);

De te rmine optimal augme ntation volume s a nd timing

a lig ne d with re c o nc ilia tio n stra te g y;

Co ntinue e xisting a ug me nta tio n pro je c ts.

SLIDE 9

APPROACH HAS MOVE D F ROM DISAST E R T O L ONG- T E RM RE SIL IE NCE

But DWS re stric tio ns a re in pla c e a nd ne e d to b e me t. Ag ric ultura l re le a se s we re limite d to e nsure 60% sa ving . Urb a n re q uire s 45% sa ving ; the c ity ha s a c hie ve d 41% to da te a nd c a n thus no t re duc e wa te r re stric tio ns de spite re c o ve ring da m le ve ls.

DE MAND SIDE

SLIDE 10

While Ca pe T

wn ha s sig nific a ntly re duc e d its de ma nd (me a sure d he re a s pro duc tio n fro m the tre a tme nt wo rks),

fro m a pe a k o f 1200 Ml/ da y in 2015 do wn to ne a rly 500 Ml/ da y, a furthe r re duc tio n in de ma nd is ne e de d to b e lo w 450 Ml/ da y to me e t the 45% sa ving re q uire d b y DWS re stric tio ns.

F

r

Cape T

wn, this me ans that de mand must still be manage d

to ge t be low 450 Ml/ day

Ma in de ma nd re duc tio n inte rve ntio ns inc lude :

punitive dro ug ht ta riffs
wa te r ma na g e me nt de vic e s & flo w re stric to rs
a g g re ssive pre ssure ma na g e me nt

De mand r e duc tion is saving >400 Ml/ day

F e b 2017 = 900 Ml/ da y July 2018 = 500 Ml/ da y

DE MAND SIDE

SLIDE 11

De mand manage me nt ac tions

DE MAND SIDE

500 1000 1500 2000 2500 3000 10 000 20 000 30 000 40 000 50 000 60 000 08-Oct 22-Oct 05-Nov 19-Nov 03-Dec 17-Dec 31-Dec 14-Jan 28-Jan 11-Feb 25-Feb 11-Mar 25-Mar 08-Apr 22-Apr 06-May 20-May 03-Jun 17-Jun WMD "no water" notifications Number of contravention actions No Water WMD notifications Weekly Contravention actions Cumulative Contravention actions

Sa ving a s a t 10 July 66 ML

D a s a t 6 July 2018.

pre ssure re duc tio n 61 ML

D

le a k re pa ir fro m re tic ula tio n re pa irs 3.5 ML

D

le a k re pa ir fro m inte rna l ho use ho ld le a ks 0.3 ML

D

L

e a k re pa ir

Pre ssure re duc tio n o n 163 zone s a c ro ss the City.
T

he b re a kdo wn o f pre ssure ma na g e me nt is a s fo llo ws:

T
ta l le ng th o f re tic ula tio n a c ro ss the 10 600km
T
ta l le ng th o f c urre nt pre ssure ma na g e d re tic ula tio n: 4 800km (45,3%)
T
ta l le ng th o f re tic ula tio n tha t will b e ma na g e d o n c o mple tio n o f c o ntra c t

(inc lude s a ll ne w zo ne s c urre ntly b e ing de sig ne d a nd c o nstruc te d): 6 200km (58,6%)

Co ntra ve ntio ns intro duc e d in Oc t 2017 – WMDs insta lle d

whe re use >20kl/ mth pe r ho use ho ld;

F

ro m 1 Ja n 2018, this c ha ng e d to insta lla tio ns a t ho use ho lds using >10.5kl/ mth;

Ave ra g e ho use ho ld size in Ca pe T
wn is 3.2, a t 50lc d =>

4.8kl/ mth pe r ho use ho ld

Spike in WMD “no -wa te r” no tific a tio ns;
Appro xima te ly 15% o f no tific a tio ns re sult in o rde rs – tha t

me a ns tha t the ma jo rity o f c a lls lo g g e d a re due to unde te c te d le a ks a nd ho use ho lds de ple ting the da ily a llo c a tio n a nd a re no t due to insta lla tio n o r me te r issue s;

SLIDE 12

Cape T

wn has done r

e ally we ll, but fur the r r e duc tion is unlike ly (diminishing r e tur ns)

‐ 50 100 150 200 250 300 350 400 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Buffalo City Nelson Mandela Bay Mangaung Ekurhuleni Metro City Of Johannesburg City Of Tshwane eThekwini Cape Town (All metros)

(base d on litre s pe r pe rson pe r day, population in se r vic e ar e a – Cape T

wn population ~ 4 million)

Cape T

wn ~125 litr

e pp pd Ave r age ur ban me tr

s

in South Afr ic a: ~270 litr e pp pd

DE MAND SIDE

SLIDE 13

Cape T

wn’s wate r

is par t of an inte gr ate d syste m

Ca pe T

wn g e ts its wa te r fro m a syste m o f da ms he a vily de pe nde nt
n ra infa ll tha t supply a g ric ulture a nd o the r urb a n a re a s. T

his c o mple x syste m is ma na g e d b y the na tio na l De pa rtme nt o f Wa te r a nd Sa nita tio n in c o o pe ra tio n with the City, b a se d o n rule s tha t:

Minimize spillage : COCTde ma nd c a n b e shifte d to da ms mo st like ly

to spill to ma ximize syste m yie ld

Minimize Wa sta g e : WC/ WDM Stra te g ie s to b e imple me nte d b y a ll

use rs

Wate r Re str ic tions : DWS a re re spo nsib le fo r de te rmining a nd

ma na g ing wa te r re stric tio ns

SUPPL Y SIDE

Ab o ut a third o f the wa te r in this syste m is use d b y a g ric ulture a nd 7% b y

the r urb a n a re a s (sma lle r to wns), with the City using 64% (unre stric te d).

SLIDE 14

RE CONCIL IAT ION ST RAT E GY APPROACH

SUPPL Y SIDE (2016 update / re vie w)

SLIDE 15

WCWSS RE CONCIL IAT ION ST RAT E GY - SCE NARIO PL ANNING

Scenario 1: optimised system operation, 100% success of WDM, no climate change impacts Scenario 2: optimised system operation, 50% success of WDM, no climate change impacts Scenario 3: optimised system operation, 50% success

f WDM, projected climate change impacts

SUPPL Y SIDE (2016 update / re vie w)

SLIDE 16

HIST ORICAL INF L OW – infor ms volume of augme ntation

SUPPL Y SIDE

F

r

m 2001- 2017, da ms >100% for

7 ye a r s out of 17

Is this a ste p c hange ? Insuffic ie nt e vide nc e to de te r

mine

SLIDE 17

Augme ntation - c onside r ations

Aug me nta tio n sc he me s a re a fa r mo re e xpe nsive so urc e

f

wa te r tha n runo ff fro m ra infa ll. T he e q uiva le nt vo lume o f runo ff c a nno t b e a ug me nte d in sho rt time pe rio ds a nd is de pe nde nt

n

ra infa ll pa tte rns. E ve n unde r po o r ra infa ll c o nditio ns like 2017 we wo uld re q uire a ug me nta tio n o f ~770 ML D to ma tc h the vo lume o f runo ff. De spite a ll a ug me nta tio n e ffo rts, the supply sc he me is vulne ra b le to po o r ra infa ll. T his is c le a r fro m the impa c t o f Ma y ra infa ll o n da m vo lume c ha ng e c o mpa re d to 100ML D wa te r pla nt o pe ra ting fo r a mo nth: suc h pla nt wo uld ne e d to o pe ra te fo r 3 mo nths to a dd 1% to da m le ve ls. As c a n b e se e n the c o st pe r kl o f wa te r fro m o the r so urc e s va ry c o nside ra b ly. T he c o st o f b ulk wa te r, wa ste wa te r a nd re tic ula tio n is c o mmo n so the c o sts c a n b e c o mpa re d to the c o st o f runo ff whic h is ~R5.20/ kl vs te mpo ra ry de sa lina tio n a t >R40/ kl.

200 400 600 800

2018 Planned augmentation 2019 Planned augmentation 500MLD 2015 runoff 2016 runoff 2017 runoff Average runoff Wet winter runoff

E quivale nt annual inflow (millions of m3)

216.3 92 37.3

50

50 100 150 200 250

10 000

20 000 30 000 40 000 50 000 Wemmershoek Voelvlei TWK All dams

Rainfall (mm) Volume change (ML)

May 2018 Rainfall impact at 3 major dams

Vol change 100MLD 16MLD Rainfall 5 10 15 20 25 30 35 40 45 50 temporary desalination temporary water re-use groundwater - TMG permanent desalination permanent re-use groundwater - sandy aquifer treated surface water- historical

Estimated cost ranges for treated water by source (R/kl)

SUPPL Y SIDE

SLIDE 18

Re vie wing Augme ntation pr

gr

amme – le ar nings fr

m dr
ught

SUPPL Y SIDE

Original program fe ature s:

T

e mpo ra ry de sa lina tio n prio ritise d (104 ML D) 16 sma ll pla nts (de sa l a nd re use ) lo g istic a lly c o mple x & po o r e c o no my o f sc a le

Ships a nd b a rg e s hug e ly e xpe nsive (200 ML

D)

Gro undwa te r (90 ML

D) no t pa rt o f imme dia te re spo nse

F
c usse d o nly o n the c ity (no t the wide r syste m)
L

a c k o f suffic ie nt a tte ntio n to wa te r de mand ma na g e me nt

E xpe r t r e vie w

1. Assuming it will not ra in a g a in is no t re a listic

2. Pr ior itise gr

und wate r

(Ca pe F

la ts Aq uife r a nd T a b le Mo unta in Gro up Aq uife r)

3. Do not pursue te mpo ra ry de sa lina tio n a nd re use

4. Pla n a nd e xe c ute pe rmane nt de salination & re -

use a t a n optimum sc ale

PROVIDING ASSURANCEF OR WAT E R SE CURIT Y IN T HE WCWSS:

E

mb e d WCWSS rule s fo r re stric tio n le ve ls linke d to da m le ve ls;

Co ntinue

WC&WDM e ffo rts b o th urb a n a nd in a g ric ulture thro ug h a da pta tio n fo r re silie nc e ;

De fine g o ve rna nc e re spo nsib ilitie s in the WCWSS re c o nc ilia tio n stra te g y;
Co nfirm

syste m yie ld in lig ht o f upda te d hydro lo g y a nd fo rma lise a llo c a tio ns to syste m use rs to pro vide c e rta inty;

Upda te WCWSS re c o nc ilia tio n stra te g y.

Spe c ific ally in pur suit of Cape T

wn as a Wate r Se nsitive City:
De ve lo p a n inte gr

ate d wate r str ate gy fo r Ca pe T

wn;
E

nsure the de ve lo pme nt o f

e nabling

wa te r ma na g e me nt so lutio ns pursua nt to pro g re ssive re a liza tio n o f;

Value wate r a nd a ppre c ia te the impo rta nc e o f wate r availability to the

re g io na l e c o no my a nd City g ro wth;

E

nsure a fle xible and adaptive ma na g e me nt a ppro a c h to de a l with a n unc e rta in wa te r future b ro ug ht a b o ut b y e me rg ing c lima tic va ria b ility a nd re g ula to ry unc e rta inty. Pla n fo r e xc e ss and sc ar

c ity;

Re duc e vulne r

ability a sso c ia te d with pre se nt o ve r re lia nc e o n surfa c e

wa te r so urc e s c o mprising the WCWSS b y se e king to

dive r sify and inte gr ate wa te rso urc e s a t multiple sc a le s;

Ma na g e e ntire ur

ban wate r c yc le a nd ma ximize r e use of waste wate r.

SLIDE 19

Re vie wing Augme ntation - Yie ld, c ost, timing infor m pr ior itie s

SUPPL Y SIDE

Sur

fac e wate r is le a st c o stly, b ut no t re silie nt to dro ug ht;

Gr
undwate r c a n pro vide re la tive ly q uic k a dditio na l wa te r into the syste m. Gro undwa te r e xtra c tio n

c a n a lso b e ma tc he d to re q uire me nt – o ve r-e xtra c ting in time s o f dro ug ht while re duc ing vo lume s whe n a ug me nta tio n is no t re q uire d;

Pe rma ne nt De salination is ve ry c o stly a nd c a nno t b e imple me nte d q uic kly BUT it is the o nly unlimite d

ne w so urc e o f wa te r into the syste m c o mple te ly inde pe nde nt o f ra infa ll;

Re - use d wate r is le ss c o stly tha n de sa lina tio n, a nd is ne c e ssa ry to ma ximize va lue fro m the dive rsifie d

supply mix whic h is c o nside ra b ly mo re e xpe nsive tha n sing le so urc e surfa c e wa te r.

Indicative target time‐frames to implement Time to implement (months from a firm commitment to proceed) Yield (million liters per day)

100 200 300

12 24 36 48

Ground (100) Reuse (70) Desalination (120) Surface (60)

5 10 15 20

100 200 300 400 Target Unit Costs and uncertainty (Rand per thousand liters) Additional supply ‐ Million liters per day (MLD) Ground

+100

Re‐use

+70

Desalination +120 Surface

+60 +50% +33% +25% +20%

SLIDE 20

Re vie wing Augme ntation – foc us on long- te r m r e silie nc e

AUGME NT AT I ON DE L I VE RI NG WAT E R I N T HE CURRE

NTHYDROL

OGI CAL YE AR I NCL UDE S:

Spring s & rive rs – c o nsiste nt yie ld o f 7.5ML

D inc re a sing during ra iny

se a so n;

Atla ntis a q uife r – susta ine d yie ld o f 12 ML

D;

T

e mpo ra ry de sa lina tio n – ma ximum yie ld o f 16ML

D. T
da te this ha s

pe a ke d a t ~8ML D with Mo nwa b isi 7ML D to c o me into syste m in July;

T

e mpo ra ry tra nsfe rs – Gro e nla nd tra nsfe r pro vide d 7MCM (millio n c ub ic me te rs) in the first q ua rte r o f 2018. SUPPLY SIDE

DWS is re spo nsib le fo r imple me nting surfa c e wa te r sc he me s whic h fo rm pa rt o f the re c o nc ilia tio n stra te g y. Re spo nsib ility fo r no n- surfa c e wa te r sc he me s ha s no t b e e n c o nc lusive ly de fine d. Whe re g ro undwa te r e nte rs the munic ipa l re tic ula tio n syste m, it a ppe a rs lo g ic a l to b e a munic ipa l re spo nsib ility. Simila rly, tre a ting munic ipa l wa ste wa te r to po ta b le sta nda rd wo uld b e a munic ipa l re spo nsib ility. Ca pe T

wn ha s c o mmitte d to a ug me nta tio n to impro ve the City’ s wa te rse c urity:
Gr
undwate r: the c o mb ine d yie ld in the first pha se pro vide s ~100ML
D. T

he c o st o f o pe ra ting sc he me s will de te rmine the spe e d o f ro ll-o ut, a nd o nc e the Pha se 1 sc he me s a re o pe ra tio na l, the de ve lo pme nt o f furthe rpha se s a nd sc he me s will b e e a sie r;

R

e -use : Wa te r re -use sc he me s inc lude b o th re c ha rg e o f CF

A a s we ll a s tre a ting wa ste wa te r to drinking wa te r sta nda rd a t F a ure tre a tme nt pla nt to pro vide 70ML

D. De pe nding o n the g ro wth re q uire d, this c o uld b e e xte nde d to o the r wa ste wa te r tre a tme nt wo rks a ro und the

me tro ;

De salination: Give n the c o st a nd c o mple xity o f de sa lina tio n pro je c ts, the c ity is c o nside ring initia ting a pro je c t a t the rig ht time pro viding

fo r e xpa nsio n, pro b a b ly in inc re me nts o f ~50ML D.

SLIDE 21

Re vie wing Augme ntation – foc us on long- te r m r e silie nc e

AUGME NT AT I ON PROJE CT S COMMIT

T E D T

O AND I N PROGRE SS:

Cape F

lats Aquife r: L

ic e nse c o nditio ns pro vide fo r e xtra c tio n o f 20MCM/ ye a r in Pha se 1, 25MCM/ yr in Pha se 2 a nd 30MCM in Pha se 3. this tra nsla te s to a susta ina b le yie ld o f 55 – 83ML D a nd a pe a k yie ld o f b e twe e n 83 – 124ML

D. Co nditio ns ha ve b e e n suc h tha t pro g re ss ha s b e e n

slo we r tha n pla nne d, b ut the yie lds spe c ifie d within the lic e nse c o nditio ns a re the ultima te ta rg e t fo r pe rma ne nt a ug me nta tio n. T he lic e nse c o nditio ns furthe r re q uire a rtific ia l re c ha rg e o f b e twe e n 12 – 25MCM fo r the thre e pha se s, fo r whic h the pro je c ts a re in de sig n;

T

able Mountain Gr

up aquife r

: L

ic e nse c o nditio ns c o ve r thre e pha se s a t a numb e r o f lo c a tio ns pro viding fo r a yie lds o f b e twe e n 42 & 130 MCM/ yr tra nsla ting to 115 – 355ML D susta ina b le yie ld. As with CF A, it ma y ta ke c o nside ra b ly lo ng e r tha n o rig ina lly pla nne d to re a lise the yie ld b ut wo rk will c o ntinue until the lic e nse d yie lds a re a c hie ve d. Due to e nviro nme nta l se nsitivitie s, initia l wo rk will b e c o nfine d to Ste e nb ra s whic h lic e nse pro vide s fo r 12-35MCM tra nsla ting to 33-96ML D o ve r the thre e pha se s;

Atlantis & Silwe r

str

om aquife r: po te ntia l fo r a n a dditio na l 20ML

D – inje c tio n into the syste m in de sig n;

Be r

g Rive r Voe lvle i augme ntation sc he me (BRVAS) in pro g re ss b y DWS to yie ld 60ML

D b y 2021;

Zandvlie t te mpor

ar y r e - use sc he me wa s pa rt o f the se c tio n 29 pro je c ts funde d in De c 2017, a nd will b e c o mple te to wa rds the e nd o f 2018;

F

aur e pe r mane nt r e -use : T

his pro je c t is in de sig n to pro vide 70ML D (e xpa nda b le to 90ML D) o f re -use wa te r fro m Za ndvlie t & po te ntia lly Ma c a ssa r into the wa te r supply fro m Ste e nb ra s a t F a ure wa te r tre a tme nt pla nt;

Alie n ve ge tation c le ar

ing: T

he impa c t o f unma na g e d a lie ns o n the syste m yie ld ha s b e e n c a lc ula te d to b e in the re g io n o f 20MCM. T he c ity ha s a c c e le ra te d pro g ra ms in its o wn c a tc hme nt a re a s a nd will wo rk with o the r sphe re s o f g o ve rnme nt a nd sta ke ho lde rs to c o ve r a ll re le va nt c a tc hme nts. AUGME NT AT I ON ST

IL L T O BE T RIGGE RE D:

Pe r

mane nt de salination: pro c ure me nt o f a pe rma ne nt de sa lina tio n pla nt ha s no t c o mme nc e d. a pro je c t is in pro g re ss to e na b le wa te r

q ua lity sa mpling o ve r a n e xte nde d pe rio d to fe e d into the site se le c tio n pro c e ss fo r pe rma ne nt de sa l. While the imme dia te re q uire me nt to a ug me nt supply ha s no t b e e n a g re e d, unde rta king a n upda te d fe a sib ility study is se e n a s a no -re g re t e nde a vo r.

F

ur the r augme ntation thr

ugh WCWSS r

e c onc iliation str ate gy: T

he re c o nc ilia tio n stra te g y is c urre ntly b e ing upda te d b y the WCWSS, inc o rpo ra ting the upda te d hydro lo g y a nd the impa c t o f the thre e -ye a r dro ug ht. F

r Ca pe T
wn a lo ne , a c c o unting fo r a ntic ipa te d g ro wth

will re q uire a n a dditio na l 30ML D e ve ry ye a r. Additio na l wa te r sc he me s will thus b e a re q uire me nt into the future . SUPPLY SIDE

SLIDE 22

Summar y

1. Co lla b o ra te with DWS to lo we r re stric tio ns re spo nsib ly b e fo re e nd o f hydro lo g ic a l ye a r (31 Oc to b e r) to pro vide

re lie f to c usto me rs, while c o ntinuing to ma na g e a nd mo nito r dam be haviour

a nd r ainfall;

2. De ve lo p a n inte g ra te d Cape T
wn Wate r

Str ate gy whic h will c rysta llise the fina nc ia l impa c t a nd g o ve rna nc e

issue s surro unding the o f le ve l o f a ssura nc e , o ptima l a ug me nta tio n vo lume , timing a nd wa te r so urc e s;

3. Co ntinue de mand manage me nt initia tive s (in line with NDWS re stric tio n o f 45% sa ving re q uire d);
4. Co ntinue wo rk o n augme ntation pr
je c ts, foc us shifte d to sustainability and c ost e ffic ie nc y:
De c isions unde r c o nside ra tio n b y the City o n optimal augme ntation type s, vo lume s, me tho ds;
Gr
undwate r pro je c ts (Atla ntis, Ca pe F

la ts a nd T MG Aq uife rs) ha ve b e e n prio ritise d inc luding Aquife r

r e c har ge pro je c ts fro m tre a te d wa ste wa te r;

L
ng- te r

m Pe r mane nt Re - use pro je c t unde r de ve lo pme nt;

L
ng- te r

m Pe r mane nt De salination unde r e va lua tio n in te rms o f siting , o ptimum yie ld & pro c ure me nt

me tho d;

4. Co ntinue ma na g ing fina nc ia l impa c ts thro ug h a ppro pria te a djustme nts to the tar

iff str uc tur e a nd le ve l. Mo nito r

ta riff re ve nue s a s a re sult o f sig nific a nt shifts in de ma nd pa tte rns a nd a ste e ply inc lining b lo c k ta riff;

5. Co ntinue e ffo rts to impro ve c oor

dination a nd le a de rship within a nd b e twe e n sphe re s o f g o ve rnme nt;

6. Co ntinue to impro ve info rma tio n flo ws a nd c o nsiste nc y o f me ssa g ing ; a c tive ly e ngage c itize ns a nd sta ke ho lde rs

to e nc o ura g e a c tive c itize nry a nd sta ke ho lde r pa rtne rships to jo intly so lve pro b le ms.

DE MAND & SUPPL Y

SLIDE 23