Riva nna Wa te r a nd Se we r Autho rity Re se rvo ir Ma na g e me - - PowerPoint PPT Presentation

Ma y 24, 2016

Riva nna Wa te r a nd Se we r Autho rity Re se rvo ir Ma na g e me nt Stud y

RWSA Re se rvo ir Ma na g e me nt Stud y T e a m

2

• K

e lly DiNa ta le , DiNa ta le Wa te r Co nsulta nts, Pro je c t Ma na g e r

• Dr. Ale xa nde r J. Ho rne , Ale x Ho rne Asso c ia te s, T

e c hnic a l Dire c to r a nd L imno lo g ist

• RWSA Sta ff
• Andre a T

e rry, Wa te r Re so urc e s Ma na g e r, Autho rity Pro je c t Ma na g e r

• Stua rt Wilso n, L

a b o ra to ry Dire c to r

• Dr. Ric ha rd Gullic k, Dire c to r o f Ope ra tio ns
• Da vid T

ung a te , Wa te r Ma na g e r

• K
• nra d Ze lle r, Wa te r T

re a tme nt Pla nt Supe rviso r

• L

a b o ra to ry sta ff

• Wa te r T

re a tme nt sta ff

RWSA Re se rvo ir Ma na g e me nt Stud y

Pro je c t Ob je c tive s

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Why d id we d o this Pro je c t?

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• Sig nific a nt a lg a e b lo o ms a t Be a ve r Cre e k a nd So uth F
• rk

re se rvo irs

• Alg a e c a n c a use pro b le ms suc h a s ta ste a nd o do r

c o mpo unds, c ya no to xins, na tura l o rg a nic ma tte r (DBP pre c urso rs), filte r c lo g g ing , a nd a lso ha ve re c re a tio na l impa c ts

• Che mic a l tre a tme nts a re re q uire d to ma na g e a lg a e
• Are the re b e tte r o r

mo re e ffe c tive a ppro a c he s to ma na g ing wa te r q ua lity c o nc e rns?

So uth Fo rk Riva nna Blo o m – Aug 21, 2015

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C he mic a l tre a tme nt histo ry fo r 2014 - 2015

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2014 No. Of Applic ations 2014 Cost 2015 No of Applic ations 2015 Cost

Be a ve r Cre e k 5 $ 46,477 4 $ 32,628 So uth F

• rk Riva nna

0 $ - 5 $ 37,200 Sug a r Ho llo w 0 $ - 1 $ 3,300 Ra g g e d Mo unta in 2 $ 12,615 6 $ 15,110 T

• tie r Cre e k

0 $ - 1 $ 5,946 T

• tal

7 $ 59,092 17 $ 94,184

Pro je c t O b je c tive s

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1.

E va lua te e xisting wa te rshe d a nd re se rvo ir da ta

2.

I de ntify fa c to rs a nd so urc e s o f e xisting o r po te ntia l wa te r q ua lity c o nc e rns prima rily re la te d to a lg a e

3.

De ve lo p a mo nito ring pla n fo c use d o n e sta b lishing b a se line da ta fo r lo ng -te rm tre nding

4.

De ve lo p stra te g ie s fo r ma na g e me nt o f wa te r q ua lity in e a c h re se rvo ir

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Re c o mme nd a dditio na l studie s a s a ppro pria te

De sire d O utc o me s

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• 1. Pro te c tio n a nd impro ve me nt o f re se rvo ir wa te r

q ua lity fo r impro ve me nt o f:

• Wa te r tre a tme nt o pe ra tio ns
• F

inishe d wa te r q ua lity

• Re c re a tio na l o ppo rtunitie s
• 2. Re c o mme nd a lte rna tive s to c he mic a l

tre a tme nts to the e xte nt pra c tic a b le a nd a ppro pria te

RWSA Re se rvo ir Ma na g e me nt Stud y

Re se rvo ir a nd Wa te rshe d Mo nito ring

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Re se rvo ir wa te r c o lumn sa mp ling

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Putting wate r fr

• m de e p-wate r

sample r into pr e -labe le d bottle

La ke p ro file - YSI So nd e

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Pr e par ing to lowe r YSI E XO2 Sonde into South F

• r

k R ivanna R e se r voir

RWSA Re se rvo ir Ma na g e me nt Stud y

Mo nito ring Re sults Summa ry

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RWSA Re se rvo ir Wa te rshe d s

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• All five re se rvo irs

sa mple d

• Pre limina ry

wa te rshe d sa mpling

• F

irst prio ritie s a nd mo st sig nific a nt issue s a re a t Be a ve r Cre e k a nd So uth F

• rk

Riva nna re se rvo irs

Sug a r Ho llo w, Ra g g e d Mo unta in a nd T

• tie r C re e k Re se rvo irs

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Conc e rns R e c omme ndations Sugar Hollow

• Pristine wa te rshe d

ye t o ne ma jo r a lg a e b lo o m in 2015

• re se rvo ir le ve l

wa s ve ry lo w

• xyg e n a lso

ve ry lo w

• Co ntinue d mo nito ring to
• de ve lo p b a se line wa te r q ua lity a nd tre nds
• de te rmine if 2015 wa s a n a b e rra tio n
• Che mic a l tre a tme nts a s re q uire d
• I

f a lg a e b lo o ms inc re a se , e va lua te o the r ma na g e me nt stra te g ie s

R agge d Mountain

• Pristine wa te rshe d

with o c c a sio na l flo a ting a lg a e

• Co ntinue d mo nito ring to de ve lo p b a se line

wa te r q ua lity a nd tre nds

• Che mic a l tre a tme nts a s re q uire d
• I

f a lg a e b lo o ms inc re a se , e va lua te o the r ma na g e me nt stra te g ie s

T

• tie r

Cre e k

• Hig h turb idity
• I

nta ke lo c a tio n

• Wa te r q ua lity limits

use to b a c kup supply

• Use c re e k inta ke fo r wa te r supply to WT

P

• Che mic a l tre a tme nts a s re q uire d to ma inta in

re se rvo ir a s a c c e pta b le b a c kup supply

Be a ve r C re e k Re se rvo ir

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C urre nt Wa te r Q ua lity C o nc e rns in Be a ve r C re e k a nd So uth Fo rk Riva nna Re se rvo irs

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Pr

• ble m/ Conc e r

n Disc ussion T aste & odor

• or

ganic s

E a rthy & musty o do rs

Color & staining - inorganic s

I ro n & ma ng a ne se re le a se d fro m se dime nts

Algal toxins

Blue -g re e n a lg a e c a n c re a te ne rve a nd live r to xins

F ilte r c logging algae

I mpa c t filte r run time s a t wa te r tre a tme nt pla nts

Impac ts to r e c r e ation and fishe r ie s

Surfa c e b lo o ms a ffe c t sho re line a nd o n-la ke re c re a tio n L

• w disso lve d o xyg e n a ffe c ts fishe rie s a nd c a n le a d to

fish kills

Che mic al tre atme nts

Up to a ppro xima te ly $50,000 a nnua l c o st fo r e a c h re se rvo ir fo r tre a tme nt with c o ppe r a lg a e c ide Co nc e rn o ve r b uild up o f c o ppe r re sista nc e b y a lg a e a nd a c c umula tio n in re se rvo ir se dime nts

Be a ve r C re e k a nd So uth Fo rk Riva nna Find ing s Ba se d o n 2015 Sa mp ling

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• Wa te r q ua lity do mina te d b y b lue -g re e n a lg a e

spe c ie s

• L
• we r de pths o f re se rvo ir b e c o me s a no xic (no
• xyg e n) fro m June thro ug h fa ll
• Nitro g e n pre se nt we ll a b o ve le ve ls ne e de d fo r

a lg a e g ro wth

• Pho spho rus like ly limiting nutrie nt fo r a lg a l g ro wth
• Nutrie nts a ppe a r to b e c o ming fro m b o th inte rna l

a nd e xte rna l so urc e s

• Addre ssing wa te rshe d so urc e s o f nutrie nts is

c ha lle ng ing , b ut ma y b e b e ne fic ia l

• Additio na l mo nito ring ne e de d to re fine inte rna l v.

e xte rna l so urc e s a nd ta rg e t ma na g e me nt me tho ds

Be a ve r C re e k Disso lve d O xyg e n

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So uth Fo rk Riva nna Re se rvo ir

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So uth Fo rk Riva nna Blo o m – July 28, 2015

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Be a ve r C re e k a nd So uth Fo rk Riva nna Po te ntia l In-La ke O p tio ns

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Me thod De sc r iption E stimate d c ost

Oxyg e na tio n o r a e ra tio n o f hypo limnio n

• Suppre sse s inte rna l nutrie nt lo a ding
• Pro vide s o xyg e n thro ug ho ut the

re se rvo ir

• $1.1M pro je c t c o st.

Annua l O&M o f $25,000 to $50,000 Nutrie nt Se dime nt Re me dia tio n

• Co uld re mo ve po llutio n in se dime nts

in to p 10 - 20 c m – o the rwise to o c o stly

• Must a ddre ss e xte rna l lo a ding fo r

lo ng -te rm e ffe c tive ne ss

• Studie s re q uire d to

de te rmine the de pth a nd a re a l e xte nt o f nutrie nts in the se dime nts Che mic a l he rb ic ide s fo r a lg a e c o ntro l

• Curre nt pra c tic e
• Sho uld b e use d fo r infre q ue nt o r

urg e nt e ve nts

• Co nside r no n-c he mic a l me tho ds
• $0 to $50,000 pe r ye a r

unle ss a lg a e b e c o me re sista nt to c he mic a ls Vig o ro us E pilimne tic Mixing

• Mix the uppe r po rtio n o f the re se rvo ir

to disrupt b lue -g re e n a lg a e g ro wth

• $0.75M to $1.2M pro je c t

c o st de pe nding o n mixing me tho d se le c te d

Re c o mme nd e d Ne xt Ste p s

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1.

Co ntinue with c urre nt a lg a e mo nito ring a nd a lg a e c ide a pplic a tio ns until o the r me tho ds imple me nte d

2.

I mple me nt mo difie d mo nito ring pro g ra m fo r 2016

• E

mpha sis o n Be a ve r Cre e k a nd So uth F

• rk Riva nna
• I

nflo w sa mpling a nd flo w me a sure me nts

• Co re sa mpling o f la ke se dime nts

3.

Upda te c ha rts a nd sta tistic a l a na lysis with 2016 da ta

4.

Co ntinue e va lua tio ns o f in-la ke ma na g e me nt me tho ds a nd c o sts

5.

Co o rdina te with so urc e wa te r pro te c tio n pla nning e ffo rts

6.

Re po rt a dde ndum in e a rly 2017

• Re c o mme nda tio ns fo r lo ng -te rm mo nito ring
• Re c o mme nda tio ns fo r in-la ke ma na g e me nt me tho ds

Q ue stio ns

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