Copyright 2010 HDR Engineering, Inc. All rights reserved.

Transcription

1 Turning Purple into Green: The Williamson County Water Reclamation & Reuse Project Jason Christensen, P.E. Copyright 2010 HDR Engineering, Inc. All rights reserved.

2 Presentation Outline Introduction Funding Opportunities Implementation Design & Construction Summary & Recognition

3 Project Location Round Rock, TX Climate Population (Census) 2000: 61, : 99,887 Growth Rate > 60% Water Supply & Demand?

4 Current & Projected Future (2060) Water Supply Source Existing (Active) Edwards Aquifer 1799(1 1,799 (1.6) Lake Georgetown 6,708 (6.0) Lake Stillhouse Hollow 18,101 (16.2) Annual Supply, acft/yr (mgd) Contracted (Not Yet Implemented) Lake Travis (1) 20,928 (18.7) Future Reuse 7,443 (6.6) BRA Operations (2) 15,000 (13.4) Conservation (3) 3,612 (3.2) Total 26, (23.8) 20,928 (18.7) 26,055 (23.2) 2) 1. Total of three contracts 2. BRA operations involve Lake Granger augmentation (conjunctive use) project 3. Reduces new water supply needed and is thus listed as supply 2006 TWDB Brazos G Regional Water Plan Water Demand (2009): 22,000 acft/yr (19.6 mgd)

5 Projected Population & Demands Year Projected Population Projected per Capita Demand, GPCD CORR Average Annual Demand, acft/yr (mgd) Wholesale Customers Total , ,937 (23.2) 2) 2306(2 2,306 (2.1) 28, (25.3) , ,896 (30.3) 3,151 (2.8) 37,047 (33.1) , ,617 (38.0) 4,083 (3.7) 46,700 (41.7) , ,298 (46.7) 5,092 (4.6) 57,390 (51.3) , ,680 (56.0) 6,176 (5.5) 68,856 (61.5) Data from 2006 TWDB Brazos G Regional Water Plan Current Water Demand: 22,000 acft/yr (19.6 mgd) Current Water Supply: 26, acft/yr (23.8 mgd) Near Term Shortage

6 Why Reuse? Region G Water Plan Pl t Supply needed West Plant Reuse identified Available WW supply All WWTP flow Potential $ savings Project deferral WWTP location < stream loading WWTP Information Plant Current Ultimatet Capacity, mgd 3 3 Effluent Requirements BOD, mg/l (1) TSS, mg/l Ammonia, mg/l 3 3 BCRWWTP Capacity, mgd Effluent Requirements BOD, mg/l 10 5 TSS, mg/l 15 NA Ammonia, mg/l 3 2 Phosphorous, mg/l NA 1 Turbidity, NTU NA 3 Fecal Coliform, CFU/100ml 200/800 20/75

7 Early History 1995: 24 WL installed for future reuse 1998: Type II to Forest Creek GC (0.5 mgd) 2001: Reuse Master Plan Type I proposed Financing opportunities identified 24 WL Type I Type II Initial Reuse Map

8 Funding Opportunities Open market bonds TWDB State programs Federal grants Bureau of Reclamation Old Settler s Park

9 Reclamation Grants WaterSMART Program WaterSMART Grants, 50/50 Water & Energy Efficiency Advanced Water Treatment & Demo Projects System Optimization Review Research & Development of Climate Analysis Tools Basin-Wide Studies, 50/50 Title XVI ( Reuse ), cost-share varies

10 Title XVI Program (Treatment of Impaired Waters) Eligible Projects: Direct non-potable reuse Indirect potable reuse ASR Brackish desalination Eligible Entities: N F d l Non-Federal Water management authority 17 western states or Hawaii

11 Title XVI Process Round Rock Appraisal Study Feasibility Study Congressional Authorization NEPA Compliance Financial Capability Construction

12 Title XVI Cost-Share Appraisal Study: Feasibility Study: Pilot/Demo Project: Construction: 100% Federal 50% Federal 25% Federal 25% Federal $20 Million Total Project Cap

13 Implementation Dell Diamond OSP BCRWWTP Reuse

14 Title XVI Project History 2003: Congressional appropriation & authorization for regional reuse 2008: MOU w/ Bureau of Reclamation 2009: Feasibility Report Environmental Assessment (NEPA) Master Plan Update : Design & Construction

15 Feasibility Report Pre-Construction Requirement Specific Framework Rank-Ordered Alternative Estimated Cost/ac-ft 1 (2009 $) Cost Savings Over Next More Expensive Alternative Reuse $328 $52 Water Conservation $380 $352 Lake Travis Surface Water $732 $78 Lake Granger Augmentation $810 NA 1 Costs include debt service, operation and maintenance, and reserves for equipment replacement and major maintenance items. Costs adapted from 2006 Brazos G Regional Water Plan

16 Environmental Assessment & Master Plan Update Environmental Assessment (NEPA) FONSI signed in 2009 Master Plan Update Reuse demand d projections Project phasing & pre-design Location Project Phase Est. Max. Day 8-Hour Peak Irrigation Demand Demand Consumption (mgd) (mgd) A (mgd) Dell Diamond B OSP C HEC Area 2, 3, NA Stony Point HS B Totals A Assumes demand in previous column is applied in 8 hours of irrigation per day. B Represents average daily usage from Sept 2005 Aug C Determined from peak month usage in Sept 2008.

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18 Project Costs & Funding Project Phase Reclamation Funding Year Comments Phase 1 $858, Appropriation Phase 1 $1,188, ARRA of 2009 Phases 2-5 $1,126, Title XVI Award $3,173,501 Total Grant Funds Estimated t Total Project Cost: $14.8 Million Phase 1 Constructed Phases 2-5: Summer 2014 Completion

19 Phase 1A: Old Settler s Park Reuse Waterline 24-inch C905 PVC waterline

20 Phase 1B Reuse Water Treatment Facilities 1.0 MG Clearwell TPS Disk Filters HSPS 6 mgd initial capacity, 12 mgd ultimate

21 Phase 1B Reuse Water Treatment Facilities

22 Summary Reuse reduces potable demand Reuse allows deferral of more expensive water supply options Several WaterSMART grant opportunities are available Title XVI can provide considerable grant funds for construction Federal requirements & budget Federal requirements & budget variability

23 Acknowledgements City of Round Rock Utilities Michael Thane, P.E. Don Rundell, P.E. Jeff Bell David Freireich, P.E. Bureau of Reclamation Collins Balcombe Anna Hoag, EIT Bob Derington Reclamation Award Texas Water 2011

24 Questions? Jason Christensen, P.E. HDR Engineering, Inc. Austin, Texas