~~ SUNRISE

GRAND WATER & SEWER SERVICE GWSSA 40-YEAR WATER RIGHTS USE EVALUATIONS

PROJECTION UPDATE

May 9, 2018

GRAND WATER & SEWER SERVICE AGENCY - GWSSA

GRAND WATER & SEWER SERVICE AGENCY - GWSSA 40-YEAR WATER

RIGHTS USE PROJECTIONS

Prepared by:

SUNRISE ENGINEERING, INC. 25 EAST 500 NORTH FILLMORE UTAH 84631 ( 435) 743-6151

Project Team Leads:

ROBERT WORLEY, P.E. Project Engineer

KEN TUTTLE Water Rights Specialist

MAY 9, 2018

Ken~ e 05-09 - 2018 Water Rights Specialist

GRAND WATER & SEWER SERVIC E AGENCY - GWSSA 40-YEAR WATER

RIGHTS USE PROJECTIONS

TABLE OF CONTENTS

EXECUTIVE SUMMARY ........ ... ................ ...... .. .... ... ..... .. .... ...................... 2

1.0 INTRODUCTION ................ ................................................. ... ........ 3

2.0 BACKGROUND ........ ... ....... ... ... .. .... ..... ........... ........... ..... ..... . . ..... .... 4

3.0 GENERAL INFORMATION ............................... ... .. .. ... .. .... .............. .. . 5

3.1 GROWTH .................... ..... ....... ................. ..... .. ... ....... ........ .. ... ... 5

3.2 PLANNED GROWTH AND DEVELOPMENT ... .. .. ..... .......... . ..... .......... 6

4.0 WATER RIGHTS NEEDED .. .......... .. ........................... . ...... ..... .. . ..... ... 7

4.1 CURRENT REPORTED WATER USAGE ...... ... ............. ... .... ... .... .... .. . 8

4.1.1 CURRENT INDOOR WATER USE ... .. ..... .. ................................ 8 4.1.2 CURRENT OUTDOOR WATER USE .... .... ..... ... . ..... ........ ...... ... ... 9 4 .2.0 FUTURE WATER USAGE ... ..... .. .. .. .... .. . ...... .. ... ....................... 9

4.2.1 FUTURE INDOOR WATER USE ......... ........ .... . ........... .. .......... 10 4.2.2 FUTURE OUTDOOR WATER USE . ..... .. ... ............ ...... ........... . . 10 4.2.3 TOTAL FUTURE WATER USE AT BUILDOUT . ....... .......... ... . .... . 10

5.0 WATER RIGHTS ..... ........ ... . ................. .. ......................... ... ........ . . 11

5.1 WATER RIGHTS BACKGROUND .. .. ....................... .......................... 11

5.2 EVALUATION OF WATER RIGHT .. ......... .. ....... .. .... .......................... 11

6.0 COMPARISON OF WATER RIGHT TO NEEDED WATER ............... ...... .. 12

7 .0 CONCLUSIONS AND RECOMMENDATIONS ....... .. ....... . ........ .... ... ... ... 13

APPENDIX A: RESOURCES .... .............. .. .. .. ....... .... .... ..... .. ..... .. .. ... ... .... .. . A

APPENDIX B: SERVICE AREA MAP .......... ... ..... .... ... .... ... ... ....... ... .. . . .... ... . B

APPENDIX C: WATER NEEDS PROJECTIONS ... . ........... ... . ... ........... . ......... C

APPENDIX D: WATER RIGHT INVENTORY ..... .. ...................... . ...... . .......... B

SUNRISE ENGI NEERING, I NC. • GRAND WATER & SEWER SERVICE 4 0 YEAR WATER RIGHTS USE PROJECTIONS 1

EXECUTIVE SUMMARY

The Grand \\.ater & Sewer Service ,\ gcncy (G\YS .-\) ha s em ployed the sen-i ces of Sunri se E ngineerin g, Inc. to de term ine the comprehensive water right needs for the service area through the next 40-year period endi ng in 2057 and compare it ro che available water right invento ry.

Th e porti on of Spanish \' alley \vi thin Grand Co unt y based o n proje ctions will require suffi cient water rights for 5,014.-+3 acre-feet (.-\1•) for indoor use, 11,143.17 .\ f for outdoo r use, 4,103. 7 .-\F for agriculru ral use, and 197 .55 .-\F of oche r water right commitments outs ide of Spanish Valley, mealing 20, -l58.84 .-\F. Th e -u·ater right inventory curr encly appr m·e d for G \\ "SSA use is 15,365.62 . \ f. Furure water right nee ds using upd ated county density polic ies project a need for 20,45 8.8--l. \ Fat the end o f th e 40-year period.

Thi s Stud y shows the cu rren t wate r right im·entory is insuffic ient for the needs of the nlley in 2048. T he 20 18 projections also show thi s wate r right im·entor y ,vill be substantially sh ore during the 40 -year period using the growt h rare o f --l.0% .

. -\11 the additi onal 13, 174 .-\F of historically filed , unapprm·ed application s haYe been recencly rejected by D\\'Ri or \\ithdra,vn by the applic ant. The se rights at their curre nt scarus are nor used for plannin g purposes.

C sing the total water right available in 2018 inventor y, the 15,365.62 acre-feet, there woul d be a buffer period of ab out 30 years' worth of grow th in the Gr and Co unr y portion of Spani sh Valley. Th is is demonstrated in the figure bel o\\·.

30000 .00

25000.00

1- 20000 .00 w ~ 15000.00 ' w

a::: 10000.00 (.)

< 5000.00

WATER RIGHT VS YEAR

• PROJECTED WAT ER NEEDS <>- APPROVED WATER RIGHT

_,.._ APPROVED + UNAPROVED WAT ER RIGHT _ _ _ ~ TOTAi. WR INCLUDING APPROVABL_E_? __ _

0.00 ~- - -- -- - -- -- - -.,-- -- - -- - .,---- - -- --2017 2027 2037

YEAR 2047 2057

SUNRISE ENGINEERING, INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USE PROJECTIONS 2

Ctah Code protect s a municipal entity to ho ld a -l-0-year water right invent ory for public use based on a -l-0-year \\. atc r Right needs analysis srudy. Thi s stud y, by using historical con scn-atiYe grmvth rates, dem onstr ates rhat the full imrentory plus additional water right s ,vill be need ed for public use during rhe -l-0-ycar period.

Tn recent years, Grand County ha s ap proved several development project s with a significantly higher density . . \l so, a planned de,·clopment by L'cah State Cniversity is mO\·ing forward in the planning stages which , if approved, \\;II reguire an additional 2000 ER Cs. l\Iunicipal con necti ons incr ease d ove r the last 33 years by -l-.29% annually. \\' ith this in mind, the conservative -l-°'o growrh rate used in this srudy ,,;n need to be updated fregue ntly.

It is recommended that G\\'SS _-\ reguire furure de,·elopmcnt to dedicate water right to G\\ .,SS.\ sufficient to serYe the needs of the fururc de,·eloped land and implem ent additio nal mean s o f consen ·aa on.

1.0 INTRODUCTION

Ju st to the southea st of Ioab, Ctah is the area kno\\·n as pan ish Valley. Culinar y water, wastewater, and irrigatio n services arc prm·ided by the Grand \\'ater & Sewer Sen,ice .\ genc y. G\'\°SS,\ is made up of three separate entitie s: Spani sh \'alley \Yater & Se,ver Special Improvement Di strict, Gr and Cou nty \\ 'acer Conse rvancy D istrict, and G rand County Special .'e n-ice \\ 'acer Di srrict. The wat er righr assets are in the name o f all these various Di stricts . G\\'SSA serves all Grand Coun ty as well as parts of. an Juan and Eme ry Counties. Currentl y, a majority of rhe wat er right owned by G\\ 'SS.-\ is used within Spani sh Valley between Moab City and the San Juan Cou nty line.

G\\"SS_-\ has employed the sen;c es of Sunrise Engi neering, Inc. (SEI) to cn1uare rhe water righr inventory and determine what water right s are needed for the area through the next 40-year period . . -\s part of chis srudy, all wate r rights identified will be con sidered. This will be don e by determinin g if the anilable water right will be needed in the -l-0-ycar planning period based on projected gro wth o f the community. The stud y will dete rmine the domestic indoo r, outdoor, commercial, and agriculrural uses pro jecte d O\·er tl1c -l-0-year period.

'e Yeral \Yater right s are currently used out side of Spanish Valley. The se right s (197.55 .\F ) arc includ ed in the totals used to predic t the -l-0-year water use.

Through om this report , referenc es wilJ be made to Eguivalent Residential Lnits (E RL"'s) or Eguinlent Residenti al Connections (E RC's) . ERC 's and ER C's may be used interchan geably and are defined as the am ou nt of water used by an a,·erage single familr residen tial connection.

The ER L" s can then be used to eguate the water used by commercial, indu strial, and other large water using entitie s to a single residential connection. E RC's are used in determination o f system demand s and are facto red into other analysis as regu ired for design purpo ses.

SUNRISE ENGI NEERING, I NC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RI GHTS USE PROJECTIONS 3

In determining needed water rights, a map of the area has been prepared which will identif y the serYicc areas (,\PPENDI~ B). Thi s mapping shmYs areas in and near the Spani sh Valley and include s prince land as well as land ow ned br the State In stitutional and Trust Lands .\drninistrati on (SI1L\ ) which may be develo ped OYer the next -1-O-years. The goa l of this report is to assess the existing wa ter right and provide the in formation need ed to determine if addiriona l water rights are needed for new de,·clo pm ent to conrinuc.

2 .0 BACKGROUND

This report co ntain s information dcri, ·ed from the public files held by the Ctah State Enginee r and the hisrorical water right reports supplied by G \\·ss_-\. \'\'e do not make any claims as to the accuracy of that in forma tion. HowcYer, based on our research of this information, we belie, ·e the follo\,in g informational facts are sufficient to make decisions / projection in pr mid ing a -1-O-year \'\ ·acer Right Study for planning purp oses of the water right im·encory needs / use.

\\·c used current water right commitments, G\'\'SS_-\ records, public file documents, SEJ and od1cr water righ t summar y shee ts pr o, ·idcd by D\'\ lli to help identify, predict, and evaluate the wa ter right inve ntory, quantifications, and water use.

\, ·ater Source evaluations are not part of this study .

G\,.SS .-\ \\,ill help prmide the water right needs and com mitm ents of the County. 1be future dcYelopment of G\\ 'SS.-\'s water resou rces must be augmented b~-the future dedication o f pro ject fund s to contin ue the proper wate r source de,·clopment for the grow ing surrounding area.

The 4O-~·ear plan will be used to giYe G\'\"SS:\ a pictur e o f the currenr water right sta tus as co how it affects and supports the overall Count y land and water resource development.

I o wate r source can be legally develope d without a valid water right chat is ded icated and properly permitted to d,e speci fie ongoing benefic ial use.

3.0 GENERAL INFORMATION

Th e following is a portion of the L.:tah Divi sion o f\Y ate r Right s (D\\"Ri) SE Regiona l En gineer letter co Febru ary 1-1-, 2018 showing the general purpo se of the Study.

"For Extension requests beyond SO-years from the original date of the approval for the right, statute requires that information be submitted to show the water applied for is needed to meet the reasonable future requirements of the public in the next 40-years or that works have been constructed to place the water to beneficial use.

SUNRISE ENGINEERING, INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USE PROJECTIONS 4

The amount of water needed for the reasonable future requirements of the public should be based on projected growth or other water use demand data."

3 .1 GROWTH

Grand Councy in the Spanish Valley is experiencing a relatively high rate of growth. To determine the required wate r needs for the area, a reasonably accurate growth race must be estab lished using histo rical data. Predicting future population is difficult as it relies on many factors - some of which are unknown. The data available to determine the growth rate of the wate r connections over the past 33 rears is on file at D\,'Ri as reported by G\,.SS.-\. Th e growth race durin g this 33-year period was -U 9 percent annually. The figure below displays the grO\nh from 198-4 - 2017.

System Growth 1984-2017 2000 ---

u, 1800 ~ -

C 1600 ~ - -0 'Z 1400 ~ - - - - -u 1200 OJ ~ -

C 1000 C - ,- -

0 800 u 600

~ - - - -- L- L- - L- -- I-

400

200

I - ~ L- - _ ,_

I I-

Year

From 1984 to 2017 the water system grew from -47 3 co nn ection s to 1938 connection s. The followin g calculation is used co determine the historical growth race:

F = Pc'"l 1938 = -H3e1

"33

>

Solve for rate = -4.29 ° o Growt h Lowerin g the growth rate to 4° o will project the 40-year wate r use need s in a more con serYatiYe manner. 1 :or the purpo se of these water righ c projectio ns, the growth rate of 4° o is used.

SUNRISE ENGINEERING, I NC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USE PROJECTIONS 5

3.2 PLANNED GROWTH AND DEVELOPMENT

Prior ro recent years, Grand County required one acre per ERC (one home per acre of lanc.l) de\·elopcd. This density is still in force; howe\·er, Gran d County has also approved several new dcYelopmcnt s \\·ith much higher densities per acre. One new de\·clopment of 108 housing units was approYed on 7.9 acres ofland. The density for this de\·clopment is 13.8 units or ERCs per acre .. -\!so, Ctah Sracc CniYersiry is planning a new campus in the G\\"SS/\ sen-ice area which will require 2,000 ERCs if completed. It is appa rent the G\\ 'SS.-\ sen;ce area land use density has increased. Thu s, a planned limit of ERC s per acre is no longer recommended. Thus, the --1-0

·0 growth race usec.l in chis studr is conscn ,ative and will requir e an update to the --1-0-year \\;'acer Right Plan regularl~--

GW.SS..:-\ is planning for sustained irrigation of 683.95 acres. The number of planned irrigated acres is determined using the two seasons of repo ncd use (2016 and 2017 aYeraged). Thu s, it is assumed that under current planning practices, 683.95 acres will not be accounted for in the ERC calculation. The water use for chi,-683.95 acres at a duty of 6 .-\F per acre is --I-, 103.7 .-\F, which will be used.

G\\'SS.,\ has also commirted co account for dcliYery of 197.55 . \ i-: of water out side of the Spanish \"alley throu ghout the study period.

The projected amount of required ERL. s is determined using the reported connections of 2017 which arc 1,837 residential and 121 othe r connecti ons. Th e other connection s are noted in the report a. comme rcial, industrial, and institutional. To equate the nrious othe r ERCs to the residential ERC for planning purposes , a multiplier of 3.0 which was detennined in the G\\" .. • -\ 2016 \\·acer Master Plan ,di be used. Therefore, 1,837 plus (121 x 3.0 = 363.0) = 2,321.0 ERCs projected in 2017 .

1-\ t the end of the study period (205 7), the projected number of E R Gs is 11, 1--1-3.17.

4 .0 WATER RIGHTS NEEDED

The amounr of ,nter right which will be needed in the future can be determined by app lying rhc projected growth rate of --1-.0 ° o to the current number of ER C' s m-cr the --1-0-year study period. The amount of water use to be projected with each ERC must be established. The amount of water used per E RC will be determined using the data available of reported water use and the D\\'R.i water use established standard s.

4.1 CURRENT REPORTED WATER USAGE

The following \'Cater Cse Reported numbers are used to establi sh a basis for che projections.

In 2017:

SUNRISE ENGINEERING , INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USE PROJECTIONS 6

• 960.50 ,\ f of culinary system use

• 4,397.70 .\F of secondary /ir rigation system use

• 197 .55 ,-\ F of additional water deli,·ery commitments

• Total 2017 water use= 5,555.7 ,\f-

960.5 + 197.55 .-\F + 4,397.70 :\F = 5,555.70 AF of current ,,·acer use rep orted

4 .1.1 CURRENT INDOOR WATER NEED

To det ermine a reasonable water usage per ERG, the water usage was split between indoor and outdo or usage and diYided up amon g the ERC 's . The stand ard of0.45 acre-feet per ERC was used to

determine ind oo r usage which equates to 1,044.45 acre-fe et of indoo r water use in 2017.

2,321.0 ER Cs x 0.45 .-\F / ERC = 1,044.45 AF

4.2 FUTURE WATER USAGE

The projected water use can be predicted using the 4.0% projected gro wth applied to the current use amounts.

4 .2.1 CURRENT OUTDOOR WATER NEED

G\,.SS .-\, usin g a mor e con serva tive approach to outdoor watering, is planning for .166667 acres per E RC to be watered. By using the 6 ,-\ r per acre duty value, each ERC \\-;II use 1.0 acre-feet per year. The 1.0 .-\F per ERC will be used for the projections for outdoor use per ERC.

The outdoor water use projection is made by determinin g the number of ERC sand multiplyin g 1.0 ,-\F per ERL'. The outdoor ERu water usage in 20 17 is pr ojected to be:

2,321.0 ERGs x 1.0AF / F.RC = 2,321.0AF

There are 683.95 acres of irrigated agricultural land. The projected water need is derennined by the 6 AF dut y = 4,103.7 .-\F of projected agricu ltural water use. T his 4,103.7 .-\F ";u be co nstant in the projecti on each year.

4.2.2 FUTURE INDOOR WATER NEED

SUNRISE ENGIN EERI NG, INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RI GHTS USE PROJECTIONS 7

Futur e indoor wate r use is det erm ined by multipl~ing the number of E R C 's projected at the end of the • 0-year period 11,1• 3.17 ER us by OAS . \ F = S,OUA.3 .-\F needed for ind oo r use.

11,1• 3.17 ERL' x OAS AF / f. RC = 5,014.43 AF

4.2.3 FUTURE OUTDOOR WATER NEED

The amo unt of \\·acer projected as needed for out door use at the end of the •0-year period is simp ly calculated at .16667 acre s or 1.0 ,\ F per E RC.

11,1• 3.17 ERC's X 1.0 .\F / ER C = 11.143.17 .\F

In addition, agricultu re and other users will use a constant amount o f 4,103.7 AF + 197.55 AF = 4,301.25 AF use d annually fo r plannin g purp oses only.

By combini ng the projected indoor use 5,014.43 . .-\ F, the projected out do or use 11,143.17 , \ F, the consta nt agricultural and other use of 4,301 .25 . \F and the 197 .55 . \ F of othe r com mitm ents, the projected required water right at the end of the • 0-year peri od is 20,458.84 .\F , which exceeds the current inventory of 15,365.62 . \F wh ich is a 25° o shortfall.

The sup portin g data and calculations for the information pr esented in Sectio n • are contained in ,\PPE DI X C: \\",-\TF.R EE DS.

5 .0 WATER RIGHTS

5.1 WATER RIGHTS BACKGROUND

This porti on of the • 0-ycar water 1ight study will, in broad term s, update G\\ nS , \ past and continuing water right obligations already on the books to help quantify the available rights that are needed for future grow th as show n in the updated Tab les in ,\PP E DIX D: \,- .\ TE R RJGHTS.

The main purposes of the water right tab les arc cu specifically identify the water right inventories and n riou s qu antification charac teristics of the same. The y identify by co lor the Colorado RiYer, G reen River, C nder gro und and 1\Iill Cree k sources.

The water right quanti fications contained within the rabies arc not a total definitive quantii:y that can be permanently established by way of this study or any ocher document ocher cl1an a Decree from a judge or Order of the Scace Engineer ( E). The SE or Regional SF may also temporarily establish a wate r right quantificat ion if a decree is not anilable. i\11 water rights are based on clle beneficial use

SUNRISE ENGINEERING , INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USE PROJECTIONS 8

of the water right and have been historically subject to change as they are used acco rdin g to th e apprO\-al s of their application s, cer tificates, etc.

5.2 EVALUATION OF WATER RIGHT

Table 5.2 _-\ shows the different source s an d _-\F escimates of each cate go ry of right s.

Table 5.2 .-\: SCMt>.L-\RY OF \\:._-\T ER RIGHTS BY LOC\TIO

Underground 6,363 .57 Mill Creek 4,945.74 Green River 30.00 Colo. River 4 ,026 .29 Total 15.356.62 AF

Table 5.2 B shows a total of 15,356.62 acre-feet of wa ter right that is repre sented as approved for

beneficial use in '..W18.

Table 5.2 B: Sl.Jt--1.t\L\RY OF \\:",\TER RIGHTS STATlJS

ST • .\TCS .-\PPROVED CNDERGROCND t,.[ILL CC>LOR..-\DO GRF.E TOT \L _-\F CREEK RJVF.R RIVE R

.-\F 100° 0 6,363 .6 4, 945. 7 4 ,026.3 0 30 .00 15,36 5.62

i\ s of 20 I 6, an additional 13, 17-l acre-feet of unapproved wa ter right was filed for the po ssible appron.l o f the applicati ons. The unapproYed water rights ha, ·e been resoh ·ed ro a zero .-\F ,·a.lue \\;thin the year 2017. Some further discussion may be merited. The D\\:Xi rejected the :tvlill Creek filing 05-8 1-l (12,-l50.0 , \ F) in 2017 (possi bly without consulting ,v;th G \\:"SS, \ ) and the underground 1 cfs or 72-l AF application 05-2324 was withdrawn by the applicant also in 20 17.

\'Ce used the quantifications of the base water rights and ignored the change applications that haYe been apprm ·ed that combine or co nsolidate Yariou s right s togethe r to limit confu sion , oYcrlap, and / or duplicati o n of the total acre -feet available to G\'\ "SS.-\. The State' s deci sions on the change application approva ls have been con sidered in the quantification categories.

6 .0 COMPARISON OF WATER RIGHT TO NEEDED WATER

SUNRISE ENGINEERING, INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USE PROJECTIONS 9

The anilablc wate r rights are compa red to the projected water rights needed on a year by year basis in the figure bel ow.

30000 .00

25000 .00

1- 20000 .00 w ~ 15000 .00 . w a: 10000 .00 u <

5000 .00 • • • • • • • • •

WATER RIGHT VS YEAR ,. PROJECTED WATER NEEDS

--o APPROVED WATER RIGHT x APPROVED+ UNAPROVED WATER RIGHT

TOTAL WR INCLUDING APPROVABLE? - - - - -

• • • • • • • • • • • • • • • • • •

••• • • • •

0.00 J..-- - -- -- - -- - --.--- -- - - ---.---- - - --20 17 2027 2037

YEAR 2047 2057

,-\s can be seen in th e charc, the curr ent approved water righ t, as indi cate d by the -- marked line, is projected to be uti lized by .20-t8.

The -lf ma rked line at the top represents all wate r right which has bee n applied for and reduce d in 2017.

The apprm -ed water rights as shown abm·e become insufficient in the year 20-t8. The present water right im·ent ory nee ds are projected in a conseIYativc man ner. G\YSS , \ is a mwucipal wate r p rm·ider and m use continue to reyuire chat add itiona l water resources be de,·eloped for G\ 'CSS. \ to fill its fucurc wate r needs .

. -\dd itional water right dedicatio ns for future bene ficial use may be purs ued as an ongoing regular G\\-SS . \ goal based on additional needs . . -\11 water rights should be properly maintained . Diligence \\·ill be requ ired ro do so . Ongoing ,vare r righ t Action Plans arc recomme nd ed ro generate continuance of the applications until they are Ccrti ficaced / Perfecccd.

7 .0 CONCLUSIONS AND RECOMMENDATIONS

The Grand County portion of the Spani sh Valley is projected to require app roximately 20,-l58.8 -t .\ .r

SUNRISE ENGINEERING, INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USE PROJECTIONS 10

of water for residential, commercial, ere ., and to inigare rhe property which ha s been reported as irrigated land . The current inventory of 15,356.62 . \I : is projected to be used by 20-+8, nine years pri or to the end of rhe -+0-ycar period.

Th e water right currently owned and approved for G\X'SS_-\ use is 15,356.62 acre-fee t. This is nor sufficient water right ro supply the needs of the public through the -+0-year period. Ir is common for plannin g practices, when a projected buildour is predicted, the area density limit is raised by the local goYcrnmenr to allow for additional future growth. The present projected wat er use ar the end of the -+0-year period is 20, -+SS.8-+ _-\F. H oweYer, this would nor be sufficient water right if the ERL" density was allowed to incr ease in Spanish Yalley, which has happened and is expected to continue. The ER C' s '\\-ill increa se, and the amount of water used \\·ill also increase.

The above stared study conclusions are onh- appl icab le if all the current \Yater right is allocated for residential, commercial, and the aforementioned uses. If G\,.SS .-\ determines to allocate rhe available water right to ocher beneficial uses such as new agricultural or industrial land uses, then the buffer period would decrease proportionally.

Ir is recommended that G\,· S_-\ consider reque sts fo r use o f a quanrit: of water ba sed on the greatest benefit. Reque sts for large quantities of water , such as for additional agricultur al, and industrial use should be strucrured on an annua lly concracccd customer basis and controlled by G\\"SS i\.

The reported use to dare indic ates tl1ac the G\\.SS ,\ culinary water use average is below the 0.-+5 .\F per indoor unit (the industry standard ) indicating chat conservation measures haYe been implemented successfully. The plan projections also indicate a S,093 AF shortfall in water right during the -+0-year period beginning at 20..+8. \Ye recommend that G\\ 'SS_-\ continue to educat e its custo mer s on con servati on practices specific to the area that may help them meet the ongo ing water usage goals of G\\ ·ss.-\.

Based on the available data, it can be seen chat the total approved water right that G\,.SS .-\ manage s \\ill nor be enough to serve Spanish\ ' alley through the entire -+0-year period . In addition, there is e,-en less of a buffer available if any of che water right is allocated to othe r parts of the Counry.

It is recommended that G\\ 'SS.-\ require new development to bring sufficient water rights and project fund s to develop \\'ater sou rces suffi cienr to serve che needs of the ne\vly developed water use.

G\\"SS_-\ will be required to diligentl y pursue the certification an d perfection of the wate r right inventory. As che future \,·acer use exceeds the amou nt of ,vatcr certificated, G\\ 'SS_-\ can proof and certificate the additio nal water use / right. The evaluation of the water use/ POD ~fatrix should be ongoing to be sure char the water rights are proofed as soon as they arc fully urilized.

SUNRISE ENGINEERING, I NC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USE PROJECTIONS 11

APPENDIX A: RESOURCES

The follo\\in g resource s were used in the compilati on of this document.

1. D\v"Rl \\",-\TER RIGHT I VE TORY 2018 (Below)

2 . Grand \'\.ater & ewer Senice .-\gency - G\\"SS.-\ "~0-year \X"ater Right Plan 2007" (on file " ich D\'\Tu )

SUNRISE ENGINEERING , INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USAGE PROJECTION A

APPENDIX A

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x.,-..-,y_...,w,.• rs ·.J ""-~C). -.et

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APPENDIX A

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APPENDIX B: SERVICE AREA MAP

SUNRISE ENGINEERING, I NC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USAGE PROJECTION 8

CU~iENTLY lRRl:il\TED ffid • :~ £&\U£: .

MOAa CITY ~ CJl.NTY 80..N!)~Y

BUILD•B-E D AREA

APPENDIX C

GWSSA Water Riaht Needs Projections 2018 WATER RIGHT NEEDED (ACRE-FEET) 4.00o/. larowth rate Projecte d Acres Dedicated APPROVED

Year ERU's In do or Outd oor Irrigated Outside S.V. Tota l WR TOTAL WR TOTAL WR Year INCLUDING INCLUDING YEAR 2017 0 2321 .00 1044.45 232 1.00 4103.70 197.55 76&,.70 11.446 .93 29,349.50 14 025 .97 0

2018 1 24 13.84 1086.23 2413 84 4 103.70 197 55 7801.32 15.365 62 15.365 .52 15365.62 1

2019 2 2510 .39 1129.68 2510 .39 4103.70 197.55 7941.32 15.365 .62 15 365.62 15365 .62 2 2020 3 2610 .81 1174.86 2610 .81 4103.70 197.55 8086.92 1536562 15 365.62 15 36562 3 2021 4 2715.2 4 1221.86 27 15 24 4 103.70 19755 8238.35 15 365 62 15365.62 15 36562 4 2022 5 2823 .85 1270.73 2823.85 4 103.70 197 55 8395.83 15 365 .62 15.365 .62 15 365 .62 5 2023 6 2936.81 1321.56 2936,81 4103.70 197.55 8559.62 15 365.62 15,365 .62 15 365 .62 6 2024 7 3054.28 1374.42 3054 .28 4103.70 197.55 8729.95 15 365.62 15,365 .62 15 365 .62 7 2025 8 3176.45 1429.40 3176 45 4103.70 197 55 8907.10 15 365 .62 15.365 .62 15 365 .62 8 2026 9 3303.51 1486 .58 3303 .51 4 103.70 197 55 9091 .33 15365 .62 15.365 .62 15365 .62 9 2027 10 3435 .65 1546.04 343565 4 103.70 197.55 9282.94 15 365 62 15,365.62 15 365.62 10 2028 11 3573.07 1607.88 3573.07 4103.70 197.55 9482.2 1 15 365.62 15.365.62 15 365.62 11 2029 12 3716 .00 1672.20 371600 4 103.70 19755 9689. 44 15 365 .62 15.365.62 15 365 .62 12 2030 13 3864 .64 1739.09 3864 64 4 103.70 19755 9904.97 1536562 15 365.62 1536562 13 2031 14 4019 .22 1808.65 4019 .22 4103.70 197.55 10129.12 15 365 .62 15 365.62 15 365 .62 14 2032 15 4179 .99 1881.00 4179 .99 4103 .70 197.55 10362.24 15 365 .62 15.365.62 15 365 .62 15 2033 16 4347 .19 1956.24 434719 4103.70 197.55 10604.67 15.365.62 15 365 .62 15 365 .62 16 2034 17 4521 .08 2034 .48 4521 .08 4 103.70 197 55 10856.81 15.365.62 15 365.62 15 365 .62 17 2035 18 4701 .92 2115.86 4701.92 4 103.70 197.55 11119.03 15,365.6 2 15,365.62 15 365 .62 18 2036 19 4890.00 2200 .50 4890.00 4103.70 197.55 11391.75 15 365.62 15 365.62 15 365.62 19 2037 20 5085. 60 2288 .52 5085 .60 4103.70 197.55 11675.37 15 .365 .62 15 365 .62 15,365.62 20 2038 21 5289 02 2380 .06 5289 02 4 103.70 19755 11970.33 15 36562 15.365.62 15 36562 21 2039 22 5500 58 2475.26 5500 58 4103.70 197 55 122TT.09 1536562 15365 .62 15 365.62 22 2040 23 5720.60 2574.27 572060 4103.70 19755 12596.13 15 36562 15.365.62 15 36562 23 2041 24 5949.43 2677.24 5949.43 4103.70 19755 12927.92 15 365 .62 15.365.62 15 36562 24 2042 25 6187.41 2784 .33 6187 .41 4103 .70 197.55 1327299 15 365 .62 15 365.62 15 365.62 25 2043 26 6434 .90 2895 .71 6434 .90 4 103.70 19755 13631.86 1536562 15.365.62 15 365 .62 26 2044 27 6692.30 3011.53 6692.30 4 103.70 19755 14005.08 15 365.62 15,365 .62 15 365 .62 27 2045 28 6959.99 3132.00 6959.99 4103.70 197.55 14393.24 15 365.62 15,365 .62 15 365 .62 28 2046 29 7238.39 3257.28 7238 .39 4103.70 197.55 14796.92 15 365.62 15,365.62 15 365 .62 29 2047 30 7527.93 3387.57 7527 .93 4103.70 197 55 15216.74 15 365 62 15,365.62 15 365.62 30 '.!11-18 ll ""'k1'U» 35.?J.,r 7 K:!')O.j no1-_-,t ,~1 ;s lilo\ lo 15 365 .62 15.365 .62 15365 .62 31 2049 32 8142 .20 3663.99 8142 .20 4103.70 197.55 16107.45 1536562 15,365 .62 15 365 .62 32 2050 33 8467 .89 3810 .55 8467.89 4103 .70 197.55 16579.69 15 36562 15.365 .62 15 36562 33 2051 34 8806 .61 3962 .97 8806 .61 4103 .70 197.55 17070 .83 15 365.62 15.365 .62 15 36562 34 2052 35 9158 .87 4 121.49 9158 87 4 103.70 197.55 17581.52 15 365 .62 15.365.62 1536562 35 2053 36 9525 .23 4286 .35 9525 23 4 103.70 19755 18112.83 15 365.62 15 365.62 15365 .62 36 2054 37 9906.2 4 445 7.81 9906.2 4 4 103.70 197.55 18665.29 15 365.62 15.365.62 15 365 .62 37 2055 38 10302.49 46 36.12 10302.49 4103.70 197,55 19239.85 15 365.62 15.365.62 15 365 .62 38 2056 39 10714.59 482 1.56 10714.59 4103.70 197.55 19837.40 15,365 .62 15.365.62 15 365.62 39 2057 40 11143.17 50 14.43 11143 .17 4103.70 197 55 20458.84 15,365.62 15.365.62 15.365.62 40 2058 41 11588.90 52 15.00 11588.90 4 103.70 197 55 21105.15 15 365 .62 15 365.62 15 365.62 41

APPENDIX C: WATER NEEDS PROJECTIONS

SUNRISE ENGINEERING, INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USAGE PROJECTION C

APPENOLX D ""'-" """ .... ,annt1 •- \ WUl •• h.HT..(NM_~IJ 2t u

\\ '•ler Cun-rnl Info CFS AcFt - PROOF I Filf'd D ,ilte Decisio n

Rid,1 1 M~od or E\·•lu,t ion Source Us,s Sl•tus Pri ority f>•t"

Soun:t Row Qu•ntity DUE D•le

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APPENDIX D: WATER RIGHT INVENTORY

SUNRISE ENGINEERING , INC. • GRAND WATER & SEWER SERVICE 40 YEAR WATER RIGHTS USAGE PROJECTION D

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