SCAMA / NOGALES WATER STORAGE STUDY APPRAISAL STUDY

Transcription

1 Photo by John Hoffman. The Santa Cruz River between Nogales and Tumacácori SCAMA / NOGALES WATER STORAGE STUDY APPRAISAL STUDY Presentation to GCASE Milestone Workshop 2 November 20, 2013

2 Presentation Outline 1. Origins of Study 2. Appraisal Study Process 3. Reuse and Tributary Recharge Alternatives 4. Project Status

3 SCAMA Geology Key Issue: Limited Amount of Aquifer Storage

4 Santa Cruz AMA

5 How the SCAMA / Nogales Study began ADWR requested Reclamation s assistance with limited aquifer storage issue Reclamation initiated Appraisal Level Study in 2006 Requires 50% match from Non-Federal sources (Cash or in-kind contribution) Cost-Share Partners: ADWR, City of Nogales Sponsor: Santa Cruz County

6 Appraisal Level Study Compiles existing data Identifies: - problem statement - at least one potential solution - potential Federal involvement Uses a comprehensive approach for addressing water resource issues

7 Appraisal Level Planning Roadmap Compare Alternatives, Screen to short list Promising alternative(s) to address problem Partners develop long list of possible solutions Problem Identification Perform appraisal level analysis of alternatives Compile Existing Data Partners Develop Evaluation Criteria Document reasons for selection

8 Problem Statement 1/20/09 The Santa Cruz Active Management Area has limited storage in local aquifers used for water supplies. Long-term storage and water augmentation alternatives are required to meet varied water demands in different locations of the SCAMA during times of drought. SCAMA total water demand can be up to approximately 40,000 acre-feet per year. Sufficient supply to meet these demands needs to be maintained to avoid future shortages. A set of water augmentation solutions is needed that would add approximately 40,000 acre-feet of storage by 2018 to augment a portion of the total supply during seasonal localized pumping and during shortages resulting from a 10-year drought. 1 Source: ADWR January 2009 SCAMA Assessment, calculated average demand from 1985 to 2006.

9 Conservation Wastewater Reuse Rainwater Harvesting Stormwater Harvesting Recharge Dams No Action Types of Alternatives

10 Long List of Alternatives Number Alternative Type Alternative Name Water Source 1 Groundwater Storage Subsurface Dam Stormwater, Groundwater, Effluent 2 Groundwater Storage Sand-Storage Dam Stormwater 3 Harvest Rainwater Commercial and Industrial - Existing Construction Rainwater 4 Harvest Rainwater Commercial and Industrial - New Construction Rainwater 5 Harvest Stormwater Commercial and Industrial - Existing Construction Stormwater 6 Harvest Stormwater Commercial and Industrial - New Construction Stormwater 7 Recharge basin or in-channel Camoro Canyon Highway 82 watershed Stormwater 8 Recharge basin Guevavi Canyon and Floodplain Stormwater, Lake Patagonia 9 Recharge basin Mariposa Gravel Pit Stormwater, Effluent 10 Recharge basin Pesqueira Canyon Gravel Pit Stormwater, Effluent 11 Recharge basin Potrero Canyon Forest Service Land Stormwater, Effluent 12 Recharge in-channel SCR at Border Stormwater, Effluent 13 Reuse Pipeline Lateral to Mariposa Canyon Effluent 14 Reuse Pipeline Lateral to Pesqueira Canyon Effluent 15 Reuse Pipeline Lateral to Potrero for Palo Duro / Meadow Hills GC Effluent 16 Reuse Pipeline Main from Kino WWTP to Tracy Lake and GC Effluent 17 Reuse Pipeline 18 Reuse Pipeline Main from NIWTP outfall to Rio Rico or use SCR as conveyance and construct collection and conveyance to Rio Rico golf course. Main from NIWTP to Nogales along SCR, NIWTP ROW, or I-19 frontage Effluent Effluent 19 Surface Water Pipeline from Patagonia Lake to Guevavi Canyon Surface Water

11 Evaluation Process Develop screening criteria based on: Effectiveness Implementability Cost

12 Effectiveness Criteria How well each alternative meets the objectives in the problem statement Factors considered in the evaluation include: - How large is effect compared to goal? - Geographic distribution of benefits and impacts - Impact to the environment - Reliability

13 Implementability Criteria Technical and Administrative feasibility - Identify constraints which could preclude or impede implementation Site specific considerations - Land use, hydrology, geology, and regulatory and permitting requirements Political Constraints - Social equity of benefits and impacts Public Acceptance Constraints

14 Cost Criteria Capital Costs Operations and Maintenance Costs Annual Cost (Amortized Capital Cost + O&M) Costs given in $/acre-foot or $/1000 gal

15 Assessment of Alternatives - Partners jointly develop criteria - Each partner ranks alternatives - Group develops consensus ranking - Group jointly selects projects for further investigation

16 Two Alternatives in Development 1. Reuse Pipeline 2. Tributary Recharge

17 Reuse Pipeline Nogales International Wastewater Treatment Plant Outfall

18 Replace Groundwater Use with Treated Effluent on Existing Turf City of Nogales Turf-Related water use: AFY Palo Duro Golf Course: 647 AFY Kino Springs Golf Course: AFY Rio Rico and Tubac Golf Courses: 1,063 AFY

19 Rio Rico Palo Duro Elev. 3,722 ft Nogales International Wastewater Treatment Plant Elev. 3,420 ft Main Pipeline Lateral Pipeline Main Pipeline to Mexico SCAMA / NOGALES WSS Reuse Pipeline Proposed Main and Laterals 9 miles from NIWTP to Border Elev. 4,008 ft

20 Major Freeway Interchange at Mariposa Rio Rico Golf Course lowest elev. 3,445 ft, 0.5 mile pipeline; highest elev. 3,483 ft, 1.8 mile pipeline; Peak Capacity = 4.1 cfs Nogales International Wastewater Treatment Plant (Elev. 3,420 ft) School mile lateral, turf area = 5.6 acres Gravel Pit mile lateral; recharge site for excess effluent; School mile lateral, turf area = 19 acres Palo Duro Golf Course End of main 4.7 miles from NIWTP; 0.5 mile lateral, peak capacity = 4.1 cfs; 102 acres (Elev. 3,722 ft) School mile lateral, turf area = 0.9 acres Nogales High School mile lateral, turf area = 11.3 acres SCAMA / NOGALES WSS Reuse Pipeline Alternative Reuse Options 9 miles from NIWTP to Border Elev. 4,008 ft Baseball Park 0.8 mile lateral, turf area = 5.7 acres Carpenter Jr. High School 0.6 mile lateral, turf area = 4.7 acres

21 Recharge Alternatives

22 1,5a 5,6 6 3,4 1,2a,5a 1,5a 1,5a 2a 1,5a 1a 3,7 1a,3 7 1a 1 4 Upper Section Lower Section Above Ground Structures (AG) (1) Gabion dikes and check dams (1a) (2) Low water road crossings and sills or weirs and 2a. concrete drop/energy dissipation structures (3) Drainage Channels and Serpentine Flow Paths (4) Shallow excavations and cattle ponds/tanks (5) Dams with outlet release provision; 5a Below Ground Structures (BG) (6) Slurry or geomembrane wall with partial cut-off (7) Infiltration galleries or trenches (8) Combinations

23 Study Progress 1. Compiled references 2. Developed Problem Statement 3. Compiled hydrogeologic data 4. Prepared preliminary maps 5. Developing alternatives 6. Developing evaluation criteria a a in progress

24 SCAMA / NOGALES WSS Reclamation Contact Eve Halper Project Manager ehalper@usbr.gov