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DRAFT MEMORANDUM. Water Supplies and Water Management Strategies for Upper Trinity Regional Water District

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DRAFT MEMORANDUM TO: FROM: Project: SUBJECT: Region C Water Planning Group Tom Gooch File: NTD02182\T:\Task 4 - Water Mgmt Strategies\WWPs\UTRWD\UTRWD Plan.doc NTD-02182, Region C Water Plan Water Supplies
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DRAFT MEMORANDUM TO: FROM: Project: SUBJECT: Region C Water Planning Group Tom Gooch File: NTD02182\T:\Task 4 - Water Mgmt Strategies\WWPs\UTRWD\UTRWD Plan.doc NTD-02182, Region C Water Plan Water Supplies and Water Management Strategies for Upper Trinity Regional Water District DATE: May 5, 2005 The Upper Trinity Regional Water District (UTRWD) is a Wholesale Water Provider in the Region C water planning area. This memorandum describes the water supply strategies proposed for UTRWD for the 2006 Region C Water Plan. The memorandum includes the following sections: Demands Existing Supplies and Comparison of Supplies and Demands Potential Water Management Strategies Considered for UTRWD Recommended Water Management Strategies and Alternatives Demands Table 1 shows the projected demands on the Upper Trinity Regional Water District from existing and potential customers. Figure 1 shows the demands by category of customer. The demand for water from UTRWD is projected to grow to 155,831 acre-feet per year by Attachment A has more detailed information on total demands for UTRWD customers and supplies available from other sources. Existing Supplies and Comparison of Supplies and Demands Table 2 shows the sources of supply currently available to the Upper Trinity Regional Water District and compares the current supplies to the projected demands. Figure 2 is a graphical comparison of currently available supplies and projected demands. The currently available supplies for UTRWD range between 24,000 acre-feet per year and 41,000 acre-feet per year from 2010 to (The changes in supply over time are due primarily to changes in water availability from Dallas Water Utilities.) UTRWD needs to develop an additional 8,969 acre-feet per year of water supplies by 2010 to meet projected demands and an additional 123,225 acre-feet per year of water supplies by Potential Water Management Strategies Considered for UTRWD Table 3 lists the potentially feasible water management strategies considered for the Upper Trinity Regional Water District and gives information on the supply, cost, unit cost, reliability, DRAFT MEMORANDUM to Region C Water Planning Group from Tom Gooch Water Supplies and Water Management Strategies for Upper Trinity Regional Water District May 5, 2005 Page 2 of 5 environmental impacts, etc., for each strategy. Recommended Water Management Strategies and Alternatives The Region C consultants met with Upper Trinity Regional Water District staff to discuss the potentially feasible alternatives. UTRWD staff indicated that UTRWD wishes to pursue the following as recommended strategies: Conservation Additional Supply from DWU under Current Contract Lake Chapman Indirect Reuse Additional Supply from DWU Linked to Lake Chapman Reuse Lake Ralph Hall Indirect Reuse of Return flows from Lake Ralph Hall Marvin Nichols Reservoir Additional DWU Supply Oklahoma Water Water Treatment Plant and Distribution System Improvements These strategies are discussed individually below: Conservation. Conservation is the projected conservation savings for UTRWD s existing and potential customers, based on the Region C recommended water conservation program. Not including savings from low plumbing fixtures (which amount to about 5 percent of demand and are built into the demand projections) and not including reuse, conservation by UTRWD customers is projected to reach 11,516 acre-feet per year by Additional Supply from DWU under Current Contract. UTRWD s current contract with Dallas Water Utilities indicates that DWU will supply water needed for several specific water suppliers in Denton County plus an additional 10 mgd. Based on the entities UTRWD is currently supplying, the contract would supply up to 24,825 acre-feet per year to UTRWD in 2010 and up to 54,865 acre-feet per year in UTRWD is currently using less than the amount in this contract but plans to eventually use the full contracted amount. Lake Chapman Indirect Reuse. UTRWD is seeking a permit for indirect reuse of return flows originating from water supplied from Lake Chapman. UTRWD, DWU, and Denton have agreed that UTRWD would be able to reuse all return flows originating from Lake Chapman. The amount available is estimated as 60 percent of the Lake Chapman supply. Additional Supply from DWU Linked to Lake Chapman Reuse. As part of the agreement on indirect reuse of Lake Chapman reuse, DWU has agreed to sell up to 40 percent of the amount imported from Lake Chapman at the DWU raw water rate. This is addition to the supplies from the current contract between UTRWD and DWU described above. DRAFT MEMORANDUM to Region C Water Planning Group from Tom Gooch Water Supplies and Water Management Strategies for Upper Trinity Regional Water District May 5, 2005 Page 3 of 5 Lake Ralph Hall. UTRWD has applied for a water right permit to develop the proposed Lake Ralph Hall on the North Sulphur River in Fannin County. The project would yield 32,940 acre-feet per year. Water would be pumped from the lake to UTRWD s existing balancing reservoir on the line from Lake Chapman to UTRWD s new Harpool Water Treatment Plant and Lake Lewisville. From there, it would be delivered in existing facilities to the Harpool plant and the lake. (The existing facilities have sufficient capacity for the supply. Indirect Reuse of Return flows from Lake Ralph Hall. UTRWD has also applied for the right to reuse return flows from the Lake Ralph Hall project, which are assumed to be 60 percent of the supply from the project, or 17,760 acre-feet per year. Marvin Nichols Reservoir. UTRWD has been working with other Metroplex water suppliers and the Sulphur River Basin Authority to study the proposed Marvin Nichols Reservoir in East Texas. Marvin Nichols Reservoir was a recommended strategy in the 2001 Region C Water Plan. The project would provide a large source of additional supply for the Metroplex at a relatively low cost. At the present time, UTRWD, the Tarrant Regional Water District and the North Texas Municipal Water District plan to pursue Marvin Nichols Reservoir as a recommended strategy. Dallas Water Utilities and Irving consider the project to be an alternative source of supply in their planning. The total yield of Marvin Nichols Reservoir is 612,300 acre-feet per year, assuming that Ralph Hall Lake is senior to Marvin Nichols Reservoir and that Marvin Nichols Reservoir is operated as a system with Lake Wright Patman. UTRWD plans to use 35,000 acre-feet per year of that supply. The delivery system from Marvin Nichols Reservoir (which is three-quarters of the total cost of the project) will be developed in phases. Phase 1 would be developed by 2030 and would include the reservoir and the initial pipelines and pump stations. Phase 2, planned for 2050, would include parallel pipelines and additional pump stations to deliver the remainder of the supply from the project. Additional Water from Dallas Water Utilities. In addition to the water supplied by DWU under the existing contract between UTRWD and DWU and the additional DWU supply associated with Lake Chapman reuse, UTRWD plans to obtain additional surface water supplies from DWU. This supply is expected to amount to 6,000 acre-feet per year by Oklahoma Water. UTRWD and other Metroplex suppliers have been pursuing the purchase of water from Oklahoma. At the present time, the Oklahoma legislature has established a temporary moratorium on the export of water from the state. In the long run, Oklahoma remains a promising source of water supply for Region C. At the present time, UTRWD, the Tarrant Regional Water District, and the North Texas Municipal Water District plan to develop water from Oklahoma as a recommended strategy. Dallas Water Utilities and Irving consider water from Oklahoma to be an alternative source of supply. The project is planned for 2060 and includes 50,000 acre-feet per year each for TRWD and NTMWD and 15,000 acre-feet per year for UTRWD. Water Treatment and Distribution Improvements. Upper Trinity Regional Water District will need to make improvements to its water treatment and distribution system to meet the demands of its customers. UTRWD has developed a capital improvement plan with specific projects through 2022, and estimated costs for improvements after 2022 are also included. DRAFT MEMORANDUM to Region C Water Planning Group from Tom Gooch Water Supplies and Water Management Strategies for Upper Trinity Regional Water District May 5, 2005 Page 4 of 5 Table 4 and Figure 3 show the strategies that develop additional water supply in the recommended plan for water supply development for UTRWD. Based on the recommended plan, 27 percent of the projected 2060 supply for UTRWD will be from conservation and reuse. (Note that this does not include conservation due to low-flow plumbing fixtures, which is built into demand projections and would add about 5 percent more to the percentage of supplies from conservation and reuse.) Table 5 gives information on the capital and unit costs for the recommended water management strategies. (Cost estimates for conservation efforts will be developed for the individual water user groups.) Attachment B includes detailed cost estimates for the recommended water management strategies. The UTRWD staff has also indicated that UTRWD might pursue the following alternative water management strategies: Toledo Bend Reservoir Lake Wright Patman George Parkhouse North Lake Texoma Additional reuse Table 6 includes cost estimates for these alternative strategies. Detailed cost estimates for Toledo Bend Reservoir, Lake Wright Patman, George Parkhouse North, and Lake Texoma are included in memoranda for other wholesale water providers. Table 1 Projected Demands for Upper Trinity Regional Water Dustrict -Values in Acre-feet per year- WUGs Argyle WSC Argyle 1,958 3,579 4,628 5,179 5,799 6,394 Aubrey ,256 1,731 2,387 3,246 Bartonville WSC Bartonville 765 1,948 2,799 3,350 3,587 3,711 Copper Canyon ,149 1,357 1,468 Double Oak Celina 661 4,925 10,751 19,037 29,116 33,600 Corinth 3,757 4,675 5,380 6,085 6,519 6,845 Denton County-Irrigation (direct reuse) Denton County-Other (80%) 5,774 7,206 8,582 9,873 11,177 12,519 Denton County Manufacturing (19%) Denton County FWSD 1A 991 1,581 2,132 2,704 3,286 3,894 Hebron (20%) Flower Mound 4,588 9,949 13,656 17,426 19,754 21,330 Highland Village 2,124 2,664 3,055 3,351 3,614 3,804 Justin ,164 2,090 2,639 2,958 Krum ,282 1,692 Lake Cities MUA Hickory Creek ,155 1,551 2,021 Lake Dallas 1,011 1,313 1,466 1,584 1,670 1,735 Shady Shores Lincoln Park Mustang SUD 623 1,226 1,740 2,250 2,782 3,319 Cross Roads 497 1,202 2,004 3,391 5,315 6,652 Oak Point ,010 1,289 1,580 1,875 Krugerville City of Sanger 1,717 2,358 2,951 3,639 4,192 4,428 Total Existing Demand 29,003 49,535 68,541 90, , ,787 Potential Customers Pilot Point 682 1,230 1,543 1,805 2,019 2,218 Prosper 500 1,890 2,861 3,509 3,779 4,049 Gunter Rural WSC ,065 1,458 1,863 Bolivar WSC (by 2010) ,297 5,147 8,154 11,030 Valley View (by 2010) ,028 1,286 Ladonia ,000 Northlake (33%) ,066 1,148 Ponder 440 1,563 3,295 5,376 6,260 6,451 Total Potential Demand 2,766 6,818 12,363 19,049 24,560 29,045 Total Demand 31,769 56,353 80, , , ,831 Figure 1 UTRWD Projected Demands 180, , ,000 Acre-feet per year 120, ,000 80,000 60,000 Potential Customers Existing Customers 40,000 20, Table 2 Currently Available Supply and Projected Demands for UTRWD -Values in Acre-feet per year- Source Currently Available Supplies DWU 10,320 11,069 14,531 19,928 28,215 27,494 Lake Chapman 14,068 13,835 13,602 13,369 13,136 12,905 Direct Reuse Total Supply 25,285 25,801 29,030 34,194 42,248 41,296 Total Supply (treated water) 24,388 24,904 28,133 33,297 41,351 40,399 Projected Demands 31,769 56,353 80, , , ,831 Losses in Treatment and Transmi 1,588 2,818 4,045 5,473 6,847 7,792 Surplus or (Shortage) (8,969) (34,267) (56,816) (81,632) (102,428) (123,225) Figure 2 Supply and Demand for UTRWD 200,000 Acre-feet per year 160, ,000 80,000 40,000 Direct Reuse DWU Lake Chapman Demands with Losses Table 3 Summary of Costs and Impacts of Potentially Feasible UTRWD Strategies Pre- Amort. Post- Amort. Additional DWU Supply under Current Contract DWU, UTRWD 27,371 $0 $0.40 $0.40 High N/A N/A N/A N/A TBD Lake Chapman Indirect Reuse UTRWD 7,743 $0 $0.00 $0.00 High Low Low Low Low TBD Facilties are in place Additional DWU Purchase Linked to Lake Chapman Reuse DWU, UTRWD 5,162 $0 $0.40 $0.40 High Low Low Low Low TBD Lake Ralph Hall UTRWD 29,600 High Medium high Medium Medium Medium TBD $211,153,000 $1.10 $0.17 Additional Indirect Reuse (Ralph Hall) UTRWD 17,760 High Low Low Low Low TRWD, Marvin Nichols NTMWD, 35,000 $142,992,000 $1.27 $0.36 High High High Medium high High TBD UTRWD Additional DWU Purchase DWU, UTRWD 6,000 $0 $0.40 $0.40 High Low Low Low Low Low Oklahoma Water 2060 Strategy Supplier(s) Quantity Capital Cost (Ac-Ft/Yr) Water Treatment and Distribution Improvements NTMWD, TRWD, UTRWD Unit Cost ($/kgal.) Reliability Environmental Factors Agricultural / Rural Impacts Other Natural Resources 3rd Party Impacts Key Water Quality Parameters 15,000 $60,967,000 $1.36 $0.45 High Low Low Low Medium low TBD UTRWD N/A $442,818,000 N/A N/A High Low Low Low Low Low Implementation Issues Requires new water rights permit, reuse permit and IBT. Requires new water rights permit and IBT. Known public opposition. Requires new or amended contract with DWU. Comments Stream has been altered such that there are significant hydrologic changes from natural conditions. See DWU memorandum for potential impacts of new DWU strategies. Purchase of additional water by UTRWD has low impacts. Oklahoma has moritorium for May require basin-wide study prior to export of water out of state. May agreement for export. require an IBT. Table 4 Supply and Demand for Upper Trinity Regional Water District -Values in Acre-feet per year- Source Existing Supplies Lake Chapman 14,068 13,835 13,602 13,369 13,136 12,905 DWU 10,320 11,069 14,531 19,928 28,215 27,494 Direct Reuse Total Existing 25,285 25,801 29,030 34,194 42,248 41,296 Water Management Strategies Conservation 837 2,963 4,779 7,003 9,419 11,516 Additional Supply from DWU (Under Current Contract) 1,000 1,000 1,000 1,000 23,280 27,371 Lake Chapman Indirect Reuse 8,441 8,301 8,161 8,021 7,882 7,743 Additional DWU Supply (Reuse) 5,627 5,534 5,441 5,348 5,254 5,162 Lake Ralph Hall 29,600 29,600 29,600 29,600 29,600 Additional Indirect Reuse 17,760 17,760 17,760 17,760 17,760 Marvin Nichols Reservoir 17,500 35,000 35,000 35,000 Additional DWU Supply 2,200 6,000 Oklahoma Water 15,000 Total Supplies from Strategies 15,905 65,158 84, , , ,152 Total Supplies 41,190 90, , , , ,448 Portion of DWU Supply from Reuse 340 1,207 2,951 3,558 8,591 10,347 Total from Conservation & Reuse 16,142 36,662 39,988 42,587 49,803 53,425 Percent from Conservation & Reuse 39.2% 40.3% 35.3% 30.9% 28.8% 27.2% Demands 31,769 56,353 80, , , ,831 Losses in Treatment and Transmission 1,588 2,818 4,045 5,473 6,847 7,792 Surplus or (Shortage) 7,834 31,789 28,321 22,997 28,864 32,825 Figure 3: Upper Trinity Regional Water District Supply and Demand 250,000 Oklahoma Water Additional DWU Supply Marvin Nichols Reservoir Supply and Demand in Acre-Feet per Year 200, , ,000 50,000 Additional Indirect Reuse Lake Ralph Hall Additional DWU Supply (Reuse) Lake Chapman Indirect Reuse Additional Supply from DWU (Under Current Contract) Conservation Direct Reuse DWU Lake Chapman Total Existing Decade Demands with Losses Strategy Supplier(s) Unit Cost for Development 2060 Quantity Capital Cost Pre- Post- Dates (Ac-Ft/Yr) (2002 Prices) Amort. Amort. Conservation Multiple ,516 Varies Varies Varies Additional DWU Supply under Current Contract DWU, UTRWD ,371 $0 $0.40 $0.40 Lake Chapman Indirect Reuse UTRWD ,743 $0 $0.00 $0.00 Additional DWU Purchase Linked to Lake DWU, UTRWD Chapman Reuse ,162 $0 $0.40 $0.40 Lake Ralph Hall UTRWD ,600 $211,153,000 $1.10 $0.17 Additional Indirect Reuse (Ralph Hall) UTRWD ,760 $0 $0.00 $0.00 Marvin Nichols TRWD, NTMWD, UTRWD ,000 $142,992,000 $1.27 $0.36 Additional DWU Purchase DWU, UTRWD ,000 $0 $0.40 $0.40 Oklahoma Water Water Treatment and Distribution Improvements TOTAL CAPITAL COSTS Table 5 Costs of Recommended Water Management Strategies for UTRWD NTMWD, TRWD, UTRWD ,000 $60,967,000 $1.36 $0.45 UTRWD N/A $442,818,000 N/A N/A 143,636 $857,930,000 Table 6 Costs of Alternative Water Management Strategies for UTRWD Strategy Toledo Bend Reservoir Supplier(s) NTMWD, TRWD, SRA, UTRWD Development Dates 2060 Quantity (Ac-Ft/Yr) Capital Cost (2002 Prices) Unit Cost for TRWD Pre- Post-Amort. Amort Unknown Depends on Quantity Unknown Unknown Lake Wright Patman DWU, UTRWD 2035 Unknown Depends on Quantity Unknown Unknown Lake Texoma UTRWD Unknown Unknown Depends on Quantity Unknown Unknown George Parkhouse North Lake UTRWD Unknown Unknown Depends on Quantity Unknown Unknown Additional Reuse UTRWD Unknown Unknown Depends on Quantity Unknown Unknown Attachment A Projected Demands for the Upper Trinity Regional Water District Upper Trinity Regional Water District Attachment A Demands for the Upper Trinity Regional Water District Water User Groups TWDB Demand (Acxe-Feet per Year) Other Supplies (Acre-Feet per Year) Demand for UTRWD (Acre-Feet per Year) Comments Demand for Current Customers Argyle WSC Other is groundwater. Argyle 2,316 3,877 4,867 5,358 5,918 6, ,958 3,579 4,628 5,179 5,799 6,394 Other is groundwater. Aubrey ,373 1,819 2,445 3, ,256 1,731 2,387 3,246 Other is groundwater. Bartonville WSC Other is groundwater. Bartonville 941 2,095 2,917 3,438 3,646 3, ,948 2,799 3,350 3,587 3,711 Other is groundwater. Copper Canyon ,176 1,375 1, ,149 1,357 1,468 Other is groundwater. Double Oak Other is groundwater. Celina 952 4,750 10,001 17,709 27,085 31, ,925 10,751 19,037 29,116 Other is groundwater, NTMWD, 33,600 and GTUA. Corinth 3,767 4,681 5,383 6,085 6,519 6, ,757 4,675 5,380 6,085 6,519 6,845 Other is groundwater. Denton County-Irrigation Contract for peak delivery rate of (direct reuse) 2 mgd with 2.5 peaking Denton County-Other (80%) 5,774 7,206 8,582 9,873 11,177 12,519 5,774 7,206 8,582 9,873 11,177 12,519 Denton County Manufacturing (19%) 1,068 1,239 1,408 1,579 1,731 1, Denton County FWSD 1A 991 1,581 2,132 2,704 3,286 3, ,581 2,132 2,704 3,286 3,894 Hebron (20%) Flower Mound 16,919 22,280 25,987 29,757 32,085 33,661 12,331 12,331 12,331 12,331 12,331 12,331 4,588 9,949 13,656 17,426 19,754 21,330 Other is DWU. Highland Village 3,394 3,722 3,902 3,986 4,037 4,086 1,659 1, ,735 2,699 3,140 3,425 3,635 3,842 Other is Carrollton. Justin ,376 2,249 2,745 3, ,298 2,198 2,714 3,010 Other is groundwater. Krum ,066 1,371 1, ,237 1,662 Other is groundwater. Lake Cities MUA - assume part of demand is met by gw Hickory Creek ,005 1,219 1,600 2, ,155 1,551 2,021 Other is groundwater. Lake Dallas 1,230 1,478 1,591 1,671 1,722 1, ,011 1,313 1,466 1,584 1,670 1,735 Other is groundwater. Shady Shores Other is groundwater. Town of Lincoln Park Other is groundwater. Mustang SUD 921 1,474 1,939 2,399 2,881 3, ,003 1,505 2,022 2,600 3,204 Other is groundwater. Cross Roads 575 1,267 2,056 3,430 5,341 6, ,202 2,004 3,391 5,315 6,652 Other is groundwater. Oak Point ,097 1,354 1,623 1, ,097 1,354 1,623 1,904 Other is groundwater. Krugerville Other is groundwater. City of Sanger 2,206 2,765 3,277 3,883 4,355 4, ,701 2,344 2,940 3,631 4,187 4,425 Other is groundwater. Total Demand from Existing Customers 28,417 49,315 68,315 90, , ,595 Potential Customers Pilot Point 1,210 1,670 1,895 2,069 2,195 2, ,138 1,610 1,847 2,033 2,171 2,319 Other is groundwater. Prosper 2,498 9,449 14,307 17,547 18,897 20,247 1,998 7,559 11,446 14,038 15,118 16, ,890 2,861 3,509 3,779 4,049 Gunter Rural WSC ,027 1,256 1,585 1, ,160 1,521 1,905 Other is groundwater. Bolivar WSC (by 2010) 1,279 1,703 3,371 6,863 10,872 14,707 1,074 1,074 1,074 1,716 2,718 3, ,297 5,147 8,154 Other is Gainesville and 11,030 groundwater. Valley View (by 2010)
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