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City of Las Cruces Water-Supply Action Plan Update September 2020 , ..CI - Of-- �4 S l .\ :a - er - u ,an v `1 'Update,..,, � .•/%4-��� - \: Ili '`l� V �� -,n �ti;,k�t Y � a. 7'��j'��1•3 � if�''��l -�. �. ..JS:j'i�� ri.' _ '�i ti`' e i _ �.- �f �:�c..`�� �S�% �i `•S � Fr-.l�.,�•�. .Nry:GSt�. - � r ]-L,ti ..- i�.. `�� ti .. John Shomaker, PhD and Annie McCoy, MS John Shomaker & Associates, Inc . GJ GRjj JSAI City of las Cruces Drawdown Warning Indicator May 7, 2020 technical memo • Drawdown warning indicator developed by defining water-level decline rates that would lead to water-level declines approaching the threshold of irreversible subsidence, near the end of the 40-year planning period. • The subsidence threshold for the Valley well field in the Mesilla Basin has been defined as 660 ft from pre-development water level. The threshold for the East Mesa could be significantly less. y GRVC JSAI N 2 wCnn�CN�: A A' 5W 0-4 ► NE 5 000 Mesilla Basin � Jornada del Muerto Basin 0 threshold of irreversible Las Cruces subsidence current water level J West Mesa Valley East Mesa well field well field,Adpre-development well field water level river valley e 4,000 O alluvium ;.::•:. LL e, v'o ae v•o ea vo o ' U er Santa Fe Group `' �+ PP { '` m E 200 m 400 Q� > — - - � 600 m N •'�'r�'r °+� — :':: ••ffd• •'Fad':d': 44444< � 'a•r .ru�ar ''w:ir'iM'rtr ''wk�:�r tr� r�•'�' bedrock 44444a4< t L 3 000 •.• $ r r r . - �:{' . � •'44 yY�r��4hd4�444�444°�>�:;.: ;;; ?+»+�r5f tt�f� :; ;',' ;;: 4a 4s4444a44 4}4 ❑ '•'a'r'ar` •t�•�!s'.�eacea'r#'r ��•� 1,000 •]{�', :tifaX{syT:'��1FS' - •:; �aa4¢4°y%r¢a¢4,�a¢4a4aaa4 °- m '.*;,i,,,;�,,,,y�,�.,;i,•, ••;�, 1 '�a44 4�c•a,4,�a,�44a4 s- � _ a ea 'dtue.•e.•. 1 r•}4444 4 444444 r 1,200 Q :.:. ::': .s:' �.:••. ,r•r,aaa :°•.4i•aaaaa a: a•r,r,r,rt�{.4� t4FS�R•R�a-`•R• .tS�?R•a.: m ppakS 4 'a•'4 3`k• ` 'a:'d'•�a�a �y.;•,�••a�ar •.,' �.a•.ar.. 'a `v'{ x" .•r,C•.A444 44444' r ?444d{•4444�444°yY4}4r4hd4�44•> ��.4••�'�as<o-`t•��•�'•Ar",ae�',r4f¢ ¢�4��4r44<G`�afaw+r•if�',r}e`�$� .�4f•4,,44444W444,�4�0 444^44.h{.: _ r.nn{i4.�n044�44r''•� ��^�'dr�'r ����b' g¢¢¢;:a 4r�r •�f+3;f+t�f' ¢ta;�¢t¢ bar• �:}r'v, o�aa4¢a%r%r¢o��;`` �.a• �k•c � ••c•ca aa'�t•• .a` �•a •c na4a 4hs•a4 "4t• taaa4 oa4 ra ^aet`3^' 4a4�4�4a a4c4 i}? a4aj 4 �`,•.y a•. 4 a•k k k d&a r••r°C•'C $•:aY G r' 4 x a a¢¢ a?$• ���'¢$N¢n�n¢a��•�¢a::�� v°viSr.'A4�•• OO,q dhti'44 `,44r'4 :b's 4°�4'.•9�y�'441°i.�°�`4�'a�'' 4h,+:4: rr4.4''r'•7 3s•°ya°,3�'d,..'� c4•oa.u4,� �0�4�4�4aaf�•:2ckt°y4•�'�4. 4a a�aa a• 444•<° � <• A4 rrr4 rir'>''�tii--44444444t�4�t'�.ti. 2•$� � afifi¢�'t ,�y4 .e�h�.444'>74q�' 4',ae 4,�`44�gh4�^4�•4�•�74.y e4:i'.S: va 4.}p� �'C}4�,rr4 44.y4.y4�4�4��44,�44 4dO''�4v� 2,000 J TQS threshold interpreted from Hawley(1984), and Hawley and Lazinsky(1992) GRI0 1 2 miles G �/� hOroontal scale JSAI ��`✓ �� 0 eity of tas eruces- 3 SW current water level West Mesa Valley East Mesa well field well field pre-development well field water level 0 � r 200 ��y a ____��� supply •�! 400 drawdown threshold ��-- ^— ---^—^ 600 safety margin threshold of irreversible subsidence a $00 m 1,000 J s 0 1 2 miles g- 1,200 horizontal scale � GR�� JSAI Bite of Las Cruces- 4 Drawdown Warning Indicator Summary Mesilla Basin Jornada del Muert❑ parameter Basin Valley and Interstate-25 West Mesa East Mesa subsidence threshold, decline from current water level, 610 a 330 b 330 b fI 20-percent safety margin, 122 66 66 fI drawdown threshold, (610 — 122) _ (330 — 66) _ (330 — 66) _ ft 488 264 264 drawdown warning indicator 1: average decline rate, 12.2 66 66 ftlyr drawdown warning indicator 2: accelerating rate of decline, 10 3 3 percent annually a assuming 50-ft drawdown from pre-development water level b assuming 70-ft drawdown from pre-development water level GJ GR jj JSAI 0 City of las Cruces- 0 20 640 0 Valley and 1-25 Corridor drawdown warning drawdown threshold (offset) indicator 2: 80 accelerating rate of decline ----decline rate 12.2 Tyr 100 10 percent annually 120 �� --0--increasing rate of decline 140 ��� Well 10 non-pumping water level 160 180 �� 18 0 Well 60 non-pumping water level 20 220 240 drawdown warning 260 � indicator 1 : 28o 28 0 average rate of decline 320 12.2 ftlyr CD a�i 340 360 380 400 420 � I I 440 460 480 500 520 540 drawdown threshold 560 (offset based on starting water level of 100 ft) %%%% 600 N CO 6) O m V r- 00 N 0 O O O m V r- 00 N 0 O O N N N N N (h (h (h (0 CO V V V V V LO LO LO LO O O O O O O O O O O O O O O O O O O O O O O O O O N N N N N N N N N N N N N N N N N N N N N N N N N GJ GRQ MOW JSAI 0 Wtv of Las eruces- 440 460 drawdown threshold (offset) 480 j1 —� East Mesa decline rate 6.6 fUyr 500 —0--increasing rate of decline 20 I —Well 40 non-pumping water level 520 Well 41 non-pumping water level drawdown warning 560 indicator 2: -Well 42 non-pumping water level accelerating rate of decline Well 43 non-pumping water level 580 3 percent annually 600 620 � � I 640 660 drawdown warning a� 680 indicator 1: 700 average rate of decline 720 6.6 ftlyr 740 760 780 800 drawdown threshold 820 (offset based on starting water level of 570 ft) 840 N CD O O M V f*- CO N LO O O O C7 V r` CO N LO O O) N N N N N CO CO CO CO V V V V V u7 LO LO 0 0 O O O O O O O O O O O O O O O O O O O O O O O O O N N N N N N N N N N N N N N N N N N N N N N N N N all GRQ mow JSAI City of Las Cruces- / 220 240 drawdown threshold (offset) 260 decline rate 6.6 ftlyr 280 drawdown warning 300 West Mesa indicator 2: --*—increasing rate of decline 320 accelerating rate of decline Well 37 non-pumping water level 3 percent annually 340 360 380 400 drawdown warning 420 indicator 1: ID 440 average rate of decline `•�� °' 6.6 ftlyr a5 460 15 3: 480 500 ` 520 540 560 drawdown threshold 580 (offset based on starting water level of 320 ft) `• 600 620 N cfl O O M V r*- CO N 0 O O O (0 V r- [O N LO O W N N N N N (n CO CO CO CO V V V V V LO LO L O O O O O O O O O O O O O O O O O O O O O O O O O N N N N N N N N N N N N N N N N N N N N N N N N N GJ GRQ JSAI 8 City of Las Cruces- Corralitos Basin and Nutt- Hockett Basin Updated Study of Groundwater Availability March 2020 draft report • Corralitos Basin: One water right that may be transferred (LRG-468 et al.), up to 1 ,472 acre-feet per year • Nutt- HocketF Basin: Pumping for irrigated agriculture estimated by NMOSE to be 13,493 acre-feet per year in 2010 (net pumping) y GRVC JSAI � `�N 0 � � Hatch Explanation ° ° Corralitos hypothetical 26 pipeline (5.68 miles) z� Nutt-Hockett hypothetical s RR TERRA COUNTY ❑ ❑ "' pipeline (61.31 miles) ° In Lo r Ri G ande j o Las Cruces city limits ° IGW Basin f=; Corralitos Basin El NMOSE Declared Underground Water ° 0 �L Basin 'y Ca ¢ ❑10 < r_r land ownership a 1 0 BLM N N e M Z ° C� 1 5 UG asin ��© ❑ � BOR + _ private land 1 ❑ j ' State ra I o 1 gas ; ® State Park p 1 ° j ° ❑ 70 Mm 1 asi a Las.Cruces z z a r a h � 0 4.5 9 4ESILLA VALLEY A- a FLATS _ Miles T1Las ruse Regiooa�_10yrWDA .d G� CSC JSAI 10 City of Las Croces� yes aw 19s aw "S zw Explanation Lower Rio Gran e i o irrigation well UGW Basin ♦ Corralitos hypothetical pipeline(5.68 miles) 2os zos3w 20S2W Upper Santa Fe Group aquifer ; Corralitos Basin N Upper Santa Fe Group aquifer Hocke t l Las Cruces city limits UG 1 !"9 NMOSE Declared up to 250 ft thick Basin Underground Water 1 y"! Basin 1 Corralitos ��4 Basin 107,000 to 268,000 acre-feet , zas aw zas 3w 1 zis zw ♦ 'f'r 23s re groundwater in storage 1 ► r 100-year supply based on 1 Rough and max water right available for 2254w 2253W 1 Ready Hills 1 ' 2251w 22S 1E 2252W transfer 1 ,472 acre-feet/year Mimbres Hypothetical pipeline route UGW Basin Sleeping o , 1 Laby O 5.7 miles, crosses BLM and ; Hills State lands 2354W 2353W 23;zw All' E f � till • zas aw 24$3W zas 2W 245 1 W 2451E GJ GRIC� 0 3 6 Miles JSAI 0 City of lag Cruces " Strawman development plan " Corralitos Basin • Evaluation of existing wells: 1 year • Establishment of beneficial use: 2 years • Application to NMOSE: 3+ years • Environmental assessment: 3+ years, concurrent with NMOSE application process • Construction of infrastructure and rehab or replacement of wells: 2-3 years 5 GRVMOW � JSAI � `�u► Upper Santa Fe Group aquifer Hatch ass sw 1ss sw 9ssaw 19s3w N up to 500 ft thick, 27 � 0000 o a,2�•� Upper Santa Fe Group and + SERRACOI�A ;;O 0 ° 1 underlying Bell Top Fm o�° ( °° over Rio Grande up to 900 ft thick NU" e � UGW Basin 20 2005Q °C o ■ 20 4W r °O o ° 00 20S aw ` �Recharge 840 to 2,520 acre-feet ° C ZNutt-Hockett per year (compared to 2010 0 00 0 3. a UGW Bann net pumping 13,493 ac-ft/yr) 121S6W o°°° z 5J° L�7 0 z r sw J o 21S aw 60,a C9 O0 data w Average water-level decline i °° o rate 3 ft/yr observed at many a r Q j Mim res wells, recent data are lacking UGW Basin 22S 6W �3 22S 5VV J 2254w u 22S 3W r Hypothetical pipeline route ' r 61 .3 miles, crosses BLM, State, ' and private lands Explanation 0 irrigation well Nutt-Hockett hypothetical zasaw ■ dairy well pipeline(61.31 miles) gas 3w NMOSE Declared municipal well yr'l Underground Water 0 3 6 Basin A R r ! Miles JSAI all 1.7 " Strawman development plan " Nutt-Hockett Basin • Water rights: It may be reasonable to assume about 4,000 acre-feet/year in any given year (less than one-third of basin net pumping) • Evaluation of existing wells: 2-3 years • Application to NMOSE: 3+ years • Environmental assessment: 3+ years, concurrent with NMOSE application process • Construction of infrastructure and rehab or replacement of wells: 6-7 years 5 GRVMOW � JSAI � `�u► ����eN�� 14 Summary of Aquifer Properties basin Corralitos Nutt-Hockett primary target aquifer Upper Santa. Fe Group Upper Santa. Fe Group a aquifer thickness, ft 5 to 254 from less thanb144, u to 5 44 depth to water, ft 156 to 224 64 to 384 total well depth, ft 257 to 344 298 to 1,292 well yield, gpm 344 to 1,444 up to 3,444 1,544 on average) hydraulic conductivity, ft/day 18 to 24 1 to 14 3.5 on average) transmissivity, W/day 2,744 to 3,444 594 to 1,711 896 on average) specific capacity, gpm/ft 14 to 11 3 to 6 (3.4 on average) a Although the Upper Santa Fe Group is identified as the primary target aquifer in the Nutt-Hockett Basin, some wells in the basin are completed in the Upper Santa Fe Group aquifer as well as the underlying Bell Top Formation, and some of the deeper wells are completed in the Bell Top Formation only. b If saturated thickness in the underlying Bell Top Formation is taken into consideration, the aquifer saturated thickness may be up to 900 ft thick. gpm—gallons per minute gpm/ft—gallons per minute per foot of drawdown ll JSAI ��` City of las Cruces basin Corralitos Nutt-Hockett NMED/DWB Summary of standard no.of samples for specific 4 18 conductance only Groundwater sample date for specific 1972 to 1976 1965 to 1982 conductance only Quality specific conductance,pmhos/cm 1,230 to 1,400 393 to 550, - and 954 TDS based on TDS/spec.cond. 800 to 906 299 to 418, 500' ratio(see below) and 725 no.of samples 1 5 sample date 1972 1965 to 1980 pH,pH units 8.0 7.5 to 8.3 6.5 to 8.5' specific conductance,�Lmhos/cm 1,400 393 to 508 - TDS,mg/L 906 309 to 369 500' TDS/specific conductance ratio 0.65 0.76 - sulfate,mg/L 280 19 to 34 250a chloride,mg/L 97 6 to 17 250' fluoride,mg/L 2.7 0.7 to 1.6 4.0 nitrate,mg/L 2.5 3.2 to 9.7 10 hardness,mg/L as CaCO3 110 72 to 140 - calcium,mg/L 29 16 to 39 - magnesium,mg/L 10 6.6 to 15 - sodium,mg/L 260 29 to 51 - potassium,mg/L 15 5.9 to 10 - iron,mg/L na 0.44(1 sample) 0.3a manganese,mg/L na 0.0063(1 sample) 0.05' silver,mg/L na <0.005(1 sample) 0.11 zinc,mg/L na 0.13(1 sample) 5 a aluminum,mg/L na 0.28(1 sample) 0.05 to 0.2a total arsenic,mg/L na 0.00446 to 0.039° 0.010 GRIj -7vIWMJSAI 0 City of las CMCes- Summary of Planning Level Corralitos Basin Nutt-Hockett Basin Capital Costs 1,470 CU ac-ft/yr 4,367 CU ac-ft/yr quan- unit cost, cost, quantity unit cost cost'cost category tit $ $ $ $ evaluation of wells full testing 3 100,000 300,000 5 100,000 500,000 partial testing 4 10,000 40,000 5 10,000 50,000 subtotal $340,000 $5 50,000 project development water rights amount, CU ac-ft/ r 1,470 4,000 5,880,000 4,367 4,000 17,468,000 transactions 1 40,000 40,000 4 40,000 160,000 pipeline miles 8 1,186,000 9,488,000 72 1,100,000 79,200,000 new wells wells 2 195,000 390,000 7 600,000 4,200,000 pumps and equipment 2 195,000 390,000 7 600,000 4,200,000 subtotal $16,188,000 $105,228,000 cost per ac-ft/yr $11,244 $24,222 CU ac-ft/yr- consumptive-use acre-foot per year al GRQMOW lJSAI City of las eruces- 1 / Thank You , and Questions John Shomaker, PhD, and Annie McCoy jshomaker@shomaker. com amccov@shomaker. com John Shomaker & Associates, Inc . 5 °RVMOW � JSAI � `�u►