HomeMy WebLinkAboutMONTAVA - PHASE G & IRRIGATION POND - BDR210013 - SUBMITTAL DOCUMENTS - ROUND 2 - SUPPORTING DOCUMENTATION (2)
748 Whalers Way
April 2022
Mr. Max Moss
HF2M Colorado
President
430 N College Ave. Suite 410
Fort Collins, CO 80524
Re: Montava Subdivision: West Non-Potable Pond
Non-Potable Water Analysis Memo
Project No. 1230.0005.00
Dear Mr. Moss:
TST, Inc. Consulting Engineers (TST) is pleased to submit this Non-
Potable Water Analysis Memo for the Montava Subdivision: West Non-
Potable Pond project to the City of Fort Collins (City) for review and
approval.
The purpose of this summary is to evaluate the water demands, supplies,
and management of the pond that will be used for the non-potable system
for the Montava Subdivision west of Giddings Road.
Please review the attached memo and provide any questions or
comments at your earliest convenience.
Sincerely,
TST, INC. CONSULTING ENGINEERS
Rachel F. Baer, E.I. Jonathan F. Sweet, P.E.
RFB JFS
______________________________
Jonathan F. Sweet
Registered Professional Engineer
State of Colorado No. 40341
748 Whalers Way
Suite 200
Fort Collins, CO 80525
970.226.0557 main
970.226.0204 fax
ideas@tstinc.com
www.tstinc.com
748 Whalers Way
Overview
The purpose of this system is to provide a constant supply of non-potable water to the Montava Subdivision,
Fort Collins Parks Department, and Poudre School District (PSD) users. To meet the demands from these
users, water will be supplied by existing well water during the shoulder seasons, WSSC water during the
peak irrigation season, and a combination of new well water with water purchased from ELCO for storage
and top off for the pond.
Demands
The three users that will be using water supplied by the west non-potable irrigation pond are the Montava
Subdivision, Fort Collins Parks Department, and PSD. The Montava Subdivision is the highest user, who
is projected to use about 481,224.99 gallons during peak day. The Fort Collins Parks Department is
projected to use 362,418.00 gallons during peak day. PSD will use 77,208.26 gallons during peak day
during the irrigation season. In total, the demand will be 920,951.25 gallons during peak day. Please refer
to Appendix A for the demand with respect to the WSSC water supply. Also see Appendix B for the
demand schedule that was generated by Hines Inc.
Supplies
A graph of the Irrigation Pond Supply throughout the irrigation season can be found in Appendix A along
with a list of assumptions and the planned watering schedule. This analysis assumes peak demand occurs
in July, per the analysis by Hines Inc., see Appendix B. The water supplies for the pond are as follows:
• WSSC water is a non-potable source that will be used during the peak portion of the irrigation
season. WSSC water serviceability goes from the middle of May through the middle of
September. WSSC water availability is 2,617,401.60 gallons per day, however, WSSC water
needs to be consumed within a 72-hour period. Depending on the demand each day, this water
will need to be balanced so that it is consumed within 3 days.
• Existing well water is a source that has a high salinity content and will be used primarily during
the shoulder seasons. Existing well water has serviceability year-round, however, it cannot be
stored longer than 72 hours and must be used within the section corner of its location. Refer to
the table below for the names of the existing wells and water rights quantities for each:
• New well water is a source that has a high salinity content and will be used for storage in the
pond. New well water will need to be augmented, however, there are no limits on where this
water can be used.
Portner Well
No. 1
(gal/day)
Portner Well
No. 2
(gal/day)
Kluver PS 1:
Well No. 1
(gal/day)
Kluver PS 1:
Well No. 2
(gal/day)
Fitzsimons
Well No. 1
(gal/day)
Fitzsimons
Well No. 2
(gal/day)
Total
(gal/day)
Fort Collins
Parks
Department
1,363,633.92 1,221,454.08 2,585,088.00
Montava
Subdivision
1,008,000.00 1,152,000.00 2,160,000.00
PSD 1,292,544.00 1,292,544.00 2,585,088.00
748 Whalers Way
• ELCO water is a potable water source that is likely the most expensive and should be used in
moderation. This water can be used as storage and is not limited to where it needs to be
consumed.
Conveyance & Measuring
Water from wells will be conveyed through a proposed irrigation system that will discharge into the pond.
WSSC water will be conveyed via the Baker Lateral ditch network and will also discharge into the pond.
If ELCO water is used, this will need to be coordinated with the District and may be conveyed from an
existing hydrant to the pond.
All water will be measured through flow meters, which will be placed prior to the discharge outlets into the
pond for the maintenance team to control the quantities of water entering the pond each day.
Water Treatment
Water treatment will be done using a combination of water mixing and AQUA4D technology to address
issues caused by high salinity in the water. The combination of these two processes should provide
adequate treatment of the water used for landscaping.
Water mixing will take place throughout the entire irrigation season. Prior to the start of the season, the
storage water is assumed to be a 50/50 mixture of high salinity well water with potable water purchased
from ELCO. At the end of the season, water will be topped off using a blend of these two sources. Salinity
content will be tested throughout the season to ensure it does not exceed the required threshold.
AQUA4D is a sustainable water treatment option that uses low-level resonance field technology to
distribute water molecule clusters into smaller components so that water can infiltrate more easily into soil
micropores, which makes it more consumable for plants. Given the nature of this process, the AQUA4D
units will be placed downstream of the pump station to avoid any electromagnetic interference caused by
the electrical equipment in the pump station. Adequate monitoring and maintenance of this system will
need to be continued throughout the season. An emergency bypass line will also be installed to
circumvent the system when it is out of operation.
Conclusion
The demands for the non-potable pond west of Giddings Road can be met with sufficient water supplies.
Water supplies come from a variety of sources, including non-potable, potable, and well water. The high
salinity content of the water acquired from wells can be treated through a combination of mixing with
potable water as well as a downstream treatment process (AQUA4D). These treatment techniques
matched with a water scheduling process will provide the Montava Subdivision, Fort Collins Parks
Department, and PSD a reliable source of non-potable water throughout the irrigation season.
APPENDIX A
Non-Pot Demand Calculations-Summary
Assumptions
• The irrigation season is assumed to be from April 15 through October 15.
• WSSC water must be consumed in a 3-day period.
• On days WSSC water is available, demand will primarily be consumed by WSSC shares.
• Water used from existing wells must be consumed in 3 days and used within its respective
section corner.
• The remaining water in the pond will be used for base storage during the irrigation season.
• The maximum 3-day drawdown for the pond is about 2.8 million gallons.
• The minimum storage volume required is about 10.7 million gallons to maintain water quality
and aesthetics.
• Prior to the start of the season, the pond is filled to the maximum volume of about 14.3 million
gallons using either water purchased from ELCO or from newly drilled wells.
• New wells will require augmentation.
• This model assumes demand fluctuates throughout the season where peak demand is in July.
• After peak demand in July, demand begins to decline and so does the pond volume due to the
3-day consumption rules for both WSSC and existing well water.
• Refill of the pond to maximum volume will begin in October, during the month of the lowest
daily demand. This refill water will come from either new wells or ELCO in addition to the
quantity of existing well water that can be consumed in a 3-day period for October.
• At the end of the season, topping off will take place using either new wells or ELCO water.
Watering Schedule
• Prior to April 15: The pond will be filled with water from newly drilled wells and/or purchased
from ELCO.
• April 15: Irrigation demand starts.
• April 15-May 18: Irrigation water supply will come from existing wells
• May 19-July 31: WSSC water is available and maintains full pond volume on days available
(approx. 2.6 million gallons/day or 4.05 cfs).
• August 1-September 3: Demand begins to decline, therefore, WSSC water can only be supplied
up to the 3-day consumption quantity.
• September 4-October 14: WSSC water is no longer available, and recharge will be done via
existing wells to meet demand. Similar to WSSC, existing well water can only be supplied up to
the 3-day consumption quantity.
• October 15: Lowest pond volume at roughly 12.8 million gallons. Irrigation demand ends and all
existing well water has been consumed.
• October 16: Pond to be topped off using new well water and/or water purchased from ELCO.
APPENDIX B
Water Budget
Project Areas
Project Name Montava West of Giddings
Date Updated 2/28/2022
Prepared By jrh
Parcel Number Parcel Name Drip Bed Area (AC)
Adjusted Drip Bed
Wetted Area (AC) 75%
Turf Area (AC)
Sprays
Turf Area (AC)
Rotors Native Area (AC)
Instantaneous
Peak Flow
(GPM)
Lot Peak
Flow (GPM
w/ 3 4-hr
windows)
P1 Phase A Open Space 0.96 0.72 0.44 1.37 4.45 72.1
P2 Phase A Residential Lots 3.76 2.82 5.64 0.00 0.00 139.5 664.0
P3 Phase B Open Space 1.05 0.79 0.51 1.52 4.58 77.7
P4 Phase B Residential Lots 3.86 2.90 5.79 0.00 0.00 143.1 646.7
P5 Phase C Open Space 1.20 0.90 0.61 1.60 4.70 83.1
P6 Phase C Residential Lots 1.91 1.43 2.86 0.00 0.00 70.8 298.7
P7 Phase D Open Space 1.22 0.92 0.76 1.89 3.43 82.0
P8 Phase D Residential Lots 4.47 3.35 6.70 0.00 0.00 165.5 726.0
P9 Phase E Open Space 1.72 1.29 0.88 1.10 1.94 63.2
P10 Phase E Residential Lots 2.70 2.02 4.04 0.00 0.00 99.9 410.7
P11 Phase F Open Space 0.58 0.43 0.52 0.74 0.93 34.1
P12 Phase F Residential Lots 1.73 1.30 2.59 0.00 0.00 64.0 246.0
P13 Phase G Open Space 0.56 0.42 0.43 0.58 1.01 30.1
P14 Phase G Residential Lots 2.77 2.07 4.15 0.00 0.00 102.5 438.7
P15 Phase H Open Space 2.40 1.80 1.11 1.45 2.77 84.9
P16 Phase H Residential Lots 0.44 0.33 0.65 0.00 0.00 16.1 62.0
P17 Phase I Open Space 1.99 1.49 0.80 1.01 1.52 59.0
P18 Phase I Residential Lots 1.26 0.95 1.90 0.00 0.00 46.8 180.0
P19 E. School & N'hood Park 2.09 1.56 4.17 12.52 2.09 328.8
P20 Regional Park 15.66 11.75 7.83 31.32 23.49 981.7
52.3 39.2 52.4 55.1 50.9 2,744.8
Total Residential Peak
Flow (GPM)3,672.7
Total Open Space Peak
Flow (GPM)1,896.6
Est Total Pump Station
Flow Rate 5,569.3
Watering Window
Material and Equipment Operating Period
(hours/day)
Operating Period
(days/week)
Operating Period
(days/month)
Turf Rotor 8 6 26
Turf Spray 8 6 26
Shrub Drip 8 6 26
Native Rotor 8 6 26
Totals
Water Budget
Monthly Water Usage (gallons) by Parcel
Project Name Montava West of Giddings
Date Updated 2/28/2022
Prepared By jrh
Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal Turf Rotor Turf Spray Shrub Drip Subtotal Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal Turf Spray Shrub Drip Subtotal Turf Rotor Turf Spray
January - - - - - - - - - - - - - - - - - - -
February - - - - - - - - - - - - - - - - - - -
March - - - - - - - - - - - - - - - - - - -
April 62,069 23,140 18,499 86,453 190,161 - 295,509 72,211 367,720 68,848 26,783 20,179 89,008 204,819 303,228 74,097 377,325 72,727 31,914
May 179,311 66,848 53,440 249,754 549,353 - 853,693 208,609 1,062,302 198,893 77,375 58,296 257,135 591,699 875,991 214,058 1,090,049 210,100 92,196
June 227,586 84,846 67,828 316,995 697,256 - 1,083,533 264,773 1,348,306 252,441 98,206 73,991 326,364 751,003 1,111,834 271,689 1,383,523 266,665 117,018
July 244,828 91,274 72,966 341,010 750,078 - 1,165,619 284,832 1,450,451 271,566 105,646 79,597 351,089 807,897 1,196,064 292,271 1,488,336 286,867 125,883
August 213,793 79,704 63,717 297,784 654,998 - 1,017,865 248,726 1,266,591 237,142 92,254 69,507 306,584 705,488 1,044,451 255,223 1,299,673 250,504 109,926
September 155,173 57,849 46,246 216,133 475,401 - 738,773 180,527 919,300 172,119 66,959 50,449 222,521 512,047 758,069 185,242 943,311 181,817 79,785
October 62,069 23,140 18,499 86,453 190,161 - 295,509 72,211 367,720 68,848 26,783 20,179 89,008 204,819 303,228 74,097 377,325 72,727 31,914
November - - - - - - - - - - - - - - - - - - -
December - - - - - - - - - - - - - - - - - - -
TOTAL (gallons) 1,144,829 426,800 341,195 1,594,583 3,507,407 - 5,450,501 1,331,889 6,782,390 1,269,856 494,007 372,200 1,641,710 3,777,773 5,592,864 1,366,677 6,959,542 1,341,408 588,637
TOTAL (acre-feet) 3.5 1.3 1.0 4.9 10.8 - 16.7 4.1 20.8 3.9 1.5 1.1 5.0 11.6 17.2 4.2 21.4 4.1 1.8
Flow Requirement (gpm) 19.6 7.3 5.8 27.3 60.1 - 93.4 22.8 116.2 21.8 8.5 6.4 28.1 64.7 95.8 23.4 119.3 23.0 10.1
Flow Requirement with Safety (gpm) - - - - 72.1 - - - 139.5 - - - - 77.7 - - 143.1 - -
MONTH
Phase A Open Space Phase A Residential Lots Phase B Open Space Phase B Residential Lots Phase C Open Space
Shrub Drip Native Rotor Subtotal Turf Spray Shrub Drip Subtotal Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal Turf Spray Shrub Drip Subtotal Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal Turf Spray Shrub Drip Subtotal Turf Rotor
- - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - -
22,981 91,449 219,071 149,960 36,644 186,604 85,957 39,945 23,469 66,784 216,155 350,641 85,683 436,324 50,064 45,840 32,960 37,751 166,614 211,708 51,733 263,441 33,607
66,390 264,185 632,871 433,217 105,861 539,079 248,321 115,396 67,798 192,933 624,449 1,012,964 247,529 1,260,493 144,628 132,426 95,217 109,058 481,329 611,601 149,451 761,052 97,087
84,264 335,312 803,260 549,853 134,362 684,215 315,177 146,465 86,051 244,876 792,570 1,285,685 314,171 1,599,856 183,566 168,079 120,852 138,420 610,917 776,263 189,688 965,951 123,226
90,648 360,715 864,113 591,508 144,541 736,050 339,054 157,560 92,570 263,428 852,613 1,383,085 337,972 1,721,057 197,473 180,812 130,007 148,906 657,199 835,070 204,059 1,039,129 132,561
79,157 314,990 754,577 516,528 126,219 642,748 296,076 137,588 80,836 230,035 744,535 1,207,765 295,130 1,502,895 172,441 157,893 113,527 130,031 573,892 729,216 178,192 907,408 115,758
57,453 228,622 547,677 374,900 91,611 466,510 214,894 99,862 58,671 166,961 540,388 876,603 214,208 1,090,811 125,159 114,599 82,399 94,377 416,535 529,270 129,333 658,603 84,018
22,981 91,449 219,071 149,960 36,644 186,604 85,957 39,945 23,469 66,784 216,155 350,641 85,683 436,324 50,064 45,840 32,960 37,751 166,614 211,708 51,733 263,441 33,607
- - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - -
423,874 1,686,721 4,040,640 2,765,926 675,884 3,441,810 1,585,437 736,761 432,864 1,231,803 3,986,866 6,467,385 1,580,376 8,047,761 923,395 845,489 607,921 696,294 3,073,099 3,904,836 954,189 4,859,026 619,865
1.3 5.2 12.4 8.5 2.1 10.6 4.9 2.3 1.3 3.8 12.2 19.8 4.8 24.7 2.8 2.6 1.9 2.1 9.4 12.0 2.9 14.9 1.9
7.3 28.9 69.2 47.4 11.6 59.0 27.2 12.6 7.4 21.1 68.3 110.8 27.1 137.9 15.8 14.5 10.4 11.9 52.7 66.9 16.4 83.3 10.6
- - 83.1 - - 70.8 - - - - 82.0 - - 165.5 - - - - 63.2 - - 99.9 -
Phase C Residential Lots Phase D Open Space Phase D Residential LotsPhase C Open Space Phase E Open Space Phase E Residential Lots
Turf Spray Shrub Drip Native Rotor Subtotal Turf Spray Shrub Drip Subtotal Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal Turf Spray Shrub Drip Subtotal Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal Turf Spray Shrub Drip Subtotal
- - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - -
27,160 11,059 18,146 89,973 135,625 33,142 168,767 26,379 22,517 10,708 19,708 79,311 217,221 53,080 270,302 65,989 57,860 46,066 53,820 223,735 34,182 8,353 42,535
78,463 31,948 52,422 259,921 391,807 95,742 487,549 76,207 65,048 30,933 56,933 229,122 627,528 153,343 780,871 190,635 167,151 133,079 155,481 646,347 98,748 24,130 122,878
99,588 40,549 66,536 329,900 497,293 121,519 618,812 96,724 82,562 39,261 72,262 290,809 796,478 194,628 991,106 241,960 212,153 168,908 197,341 820,363 125,334 30,627 155,961
107,133 43,621 71,577 354,892 534,967 130,725 665,692 104,052 88,816 42,236 77,736 312,840 856,817 209,373 1,066,190 260,291 228,225 181,704 212,291 882,512 134,829 32,947 167,776
93,553 38,091 62,504 309,906 467,154 114,154 581,308 90,862 77,558 36,882 67,882 273,184 748,206 182,832 931,039 227,296 199,295 158,671 185,381 770,644 117,738 28,771 146,509
67,901 27,647 45,366 224,932 339,064 82,854 421,917 65,948 56,292 26,769 49,269 198,279 543,053 132,701 675,754 164,973 144,650 115,165 134,551 559,338 85,455 20,882 106,337
27,160 11,059 18,146 89,973 135,625 33,142 168,767 26,379 22,517 10,708 19,708 79,311 217,221 53,080 270,302 65,989 57,860 46,066 53,820 223,735 34,182 8,353 42,535
- - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - -
500,959 203,974 334,697 1,659,495 2,501,536 611,278 3,112,813 486,552 415,309 197,497 363,497 1,462,856 4,006,525 979,038 4,985,563 1,217,134 1,067,194 849,660 992,687 4,126,674 630,468 154,062 784,530
1.5 0.6 1.0 5.1 7.7 1.9 9.6 1.5 1.3 0.6 1.1 4.5 12.3 3.0 15.3 3.7 3.3 2.6 3.0 12.7 1.9 0.5 2.4
8.6 3.5 5.7 28.4 42.9 10.5 53.3 8.3 7.1 3.4 6.2 25.1 68.7 16.8 85.4 20.9 18.3 14.6 17.0 70.7 10.8 2.6 13.4
- - - 34.1 - - 64.0 - - - - 30.1 - - 102.5 - - - - 84.9 - - 16.1
Phase F Open Space Phase F Residential Lots Phase G Open Space Phase G Residential Lots Phase H Open Space Phase H Residential Lots
Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal Turf Spray Shrub Drip Subtotal Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal Turf Rotor Turf Spray Shrub Drip Native Rotor Subtotal
- - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - -
45,898 42,112 38,127 29,539 155,677 99,238 24,250 123,488 567,852 218,405 40,027 40,561 866,845 1,421,054 409,919 300,505 456,767 2,588,246 7,237,113
132,595 121,658 110,145 85,335 449,734 286,688 70,055 356,743 1,640,463 630,947 115,634 117,176 2,504,220 4,105,267 1,184,212 868,125 1,319,550 7,477,154 20,907,214
168,294 154,412 139,800 108,310 570,816 363,873 88,916 452,789 2,082,125 800,817 146,766 148,723 3,178,433 5,210,532 1,503,038 1,101,851 1,674,814 9,490,234 26,536,080
181,044 166,110 150,391 116,516 614,060 391,439 95,652 487,092 2,239,862 861,485 157,885 159,990 3,419,223 5,605,269 1,616,904 1,185,325 1,801,694 10,209,191 28,546,389
158,095 145,053 131,327 101,746 536,221 341,820 83,527 425,348 1,955,936 752,283 137,871 139,710 2,985,800 4,894,742 1,411,945 1,035,072 1,573,310 8,915,069 24,927,833
114,746 105,281 95,318 73,848 389,193 248,095 60,625 308,720 1,419,631 546,012 100,068 101,402 2,167,113 3,552,635 1,024,799 751,262 1,141,918 6,470,614 18,092,782
45,898 42,112 38,127 29,539 155,677 99,238 24,250 123,488 567,852 218,405 40,027 40,561 866,845 1,421,054 409,919 300,505 456,767 2,588,246 7,237,113
- - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - -
846,571 776,738 703,236 544,834 2,871,379 1,830,392 447,276 2,277,668 10,473,722 4,028,355 738,279 748,123 15,988,479 26,210,552 7,560,736 5,542,645 8,424,820 47,738,754 133,484,523
2.6 2.4 2.2 1.7 8.8 5.6 1.4 7.0 32.1 12.4 2.3 2.3 49.1 80.4 23.2 17.0 25.9 146.5 409.6
14.5 13.3 12.1 9.3 49.2 31.4 7.7 39.0 179.5 69.0 12.7 12.8 274.0 449.1 129.6 95.0 144.4 818.0 2,287.4
- - - - 59.0 - - 46.8 - - - - 328.8 - - - - 981.7 2,744.8
TOTAL
Regional ParkPhase I Open Space Phase I Residential Lots E. School & N'hood Park