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OCWD Recharge Report 2010-2011

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OCWD Recharge Report 2010-2011 2010-2011 Report on Groundwater Recharge in the Orange County Groundwater Basin This Page Intentionally Left Blank 2010-11 Report on Groundwater Recharge in the Orange County Groundwater Basin Orange County Water District July 2012 Prepared by: Adam S. Hutchinson, P.G., C.H.G. Recharge Planning Manager Cover Photo Location: Close up of heron on the Santa Ana River Cover Photo Credit: Angela A. Stanton Stanton Photo Studios [email protected] http://www.stantonphotostudios.com http://angela-stanton.artistwebsites.com Table of Contents Page Executive Summary 1 Section 1. Introduction 3 2. Background 3 3. Recharge Water Sources 6 3.1 Precipitation 6 3.2 Santa Ana River 8 3.3 Santiago Creek 12 3.4 Imported Water 13 3.5 Recycled Water 14 3.6 Water Losses 15 4. Surface Water Recharge 16 4.1 Operations Overview 16 4.2 Santa Ana River Channel 19 4.3 Weir Ponds 1-4 (Desilting System) 20 4.4 Warner Basin System 21 4.5 Anaheim Lake 22 4.6 Mini-Anaheim Lake 23 4.7 Kraemer Basin 24 4.8 Miller Basin 25 4.9 La Jolla Basin 26 4.10 Placentia Basin 27 4.11 Raymond Basin 28 4.12 Off-River Channel 29 4.13 Olive Basin 30 4.14 Five Coves Basins 31 4.15 Lincoln Basin 32 4.16 Burris Basin 33 4.17 River View Basin 34 4.18 Santiago Basins 35 4.19 Santiago Creek Channel 36 5. Seawater Barrier Recharge 37 5.1 Talbert Gap Seawater Barrier 37 5.2 Alamitos Gap Seawater Barrier 38 6. In-Lieu Recharge 41 7. Recharge Summary 42 7.1 Recharge Sources 42 7.2 Recharge Facilities 46 8. References 48 List of Tables Page ES-1 Recharge Source Summary 2 4-1 Area and Storage Capacity of Surface Water Recharge Facilities 17 4-2 Monthly Recharge in Santa Ana River Channel, 2010-11 19 4-3 Monthly Recharge in Weir Pond 3, 2010-11 20 4-4 Monthly Recharge in Warner Basin System, 2010-11 21 4-5 Monthly Recharge in Anaheim Lake, 2010-11 22 4-6 Monthly Recharge in Mini-Anaheim Lake, 2010-11 23 4-7 Monthly Recharge in Kraemer Basin, 2010-11 24 4-8 Monthly Recharge in Miller Basin, 2010-11 25 4-9 Monthly Recharge in La Jolla Basin, 2010-11 26 4-10 Monthly Recharge in Placentia Basin, 2010-11 27 4-11 Monthly Recharge in Raymond Basin, 2010-11 28 4-12 Monthly Recharge in Off-River Channel, 2010-11 29 4-13 Monthly Recharge in Olive Basin 2010-11 30 4-14 Monthly Recharge in Five Coves Basins, 2010-11 31 4-15 Monthly Recharge in Burris Basin, 2010-11 33 4-16 Monthly Recharge in River View Basin, 2010-11 34 4-17 Monthly Recharge in Santiago Basins, 2010-11 35 4-18 Monthly Recharge in Santiago Creek Channel, 2010-11 36 7-1 Recharge Source Summary 45 7-2 Recharge Facility Summary 47 List of Figures Page ES-1 Total Annual Recharge by Source, 2001-11 2 2-1 OCWD Location Map 4 2-2 Surface Water Recharge Facilities 5 3-1 Annual Rainfall Totals at OCWD Field Headquarters, 1963-2011 6 3-2 Monthly Rainfall Totals at OCWD Field Headquarters, 2010-11 7 3-3 Annual Incidental Recharge, 2001-11 8 3-4 Monthly Local Storm Flow Capture, 2010-11 9 3-5 Annual Base and Storm Flow in the SAR at Prado Dam, 1936-2011 9 3-6 Monthly Santa Ana River Base and Storm Flow Recharged, 2010-11 10 3-7 Prado Dam Storage, 2010-11 11 3-8 Monthly Inflow to Santiago Basins from Santiago Creek, 2010-11 12 3-9 Monthly Recharge of Imported Water, 2010-11 13 3-10 Monthly Recharge of Recycled Water, 2010-11 14 3-11 Monthly Recharge System Losses, 2010-11 15 List of Figures (Cont’d) Page 5-1 Talbert Gap Seawater Barrier 37 5-2 Annual Injection at the Talbert Barrier, 2001-11 38 5-3 Alamitos Gap Seawater Barrier 39 5-4 Annual Injection at the Alamitos Barrier, 2001-11 40 6-1 Annual In-Lieu Recharge, 1978-2011 41 7-1 Total Monthly Recharge by Source, 2010-11 43 7-2 Recharge Sources, 2010-11 44 7-3 Total Annual Recharge by Source, 2001-11 45 7-4 Recharge by Facility, 2010-11 46 7-5 Total Annual Recharge by Facility, 2001-11 47 Appendices Appendix A Acronyms/Definitions Appendix B: Data Tables Description of Data Sources Table B-1 Monthly Rainfall at OCWD Field Headquarters,1963-2011 Table B-2 Annual Incidental Recharge, 2001-11 Table B-3 Monthly Local Inflow Summary, 2010-11 Table B-4 Annual SAR Watermaster Base Flow and Storm Flow, 1936-2011 Table B-5 Monthly SAR Base Flow and Storm Flow Recharged, 2010-11 Table B-6 Monthly Santiago Creek Inflow, 2010-11 Table B-7 Monthly Recharge of Imported and Purchased Water, 2010-11 Table B-8 Monthly Recharge of Recycled Water, 2010-11 Table B-9 Monthly Losses to Ocean and Evaporation, 2010-11 Table B-10 Annual Injection for Talbert Barrier, 1991-2011 Table B-11 Monthly Injection for Talbert Barrier, 2010-11 Table B-12 Annual Injection for Alamitos Barrier, 1991-2011 Table B-13 Monthly Injection for Alamitos Barrier, 2010-11 Table B-14 Annual In-Lieu Recharge of Imported Water, 1978-2011 Table B-15 Monthly In-Lieu Recharge of Imported Water, 2010-11 Table B-16 Annual Recharge by Source, 2001-11 Table B-17 Monthly Recharge Source Summary, 2010-11 Table B-18 Annual Recharge by Facility, 2001-11 Appendix C: Monthly Forebay Percolation Efficiency Reports This Page Intentionally Left Blank Executive Summary A total of 19.95 inches of rain was received at the Orange County Water District’s Anaheim Field Headquarters in 2010-11 (OCWD fiscal year ending June 30), which is approximately 37 percent above the historical average of 14.5 inches and is the second consecutive year of above average rainfall. What made 2010-11 notable was that over half of the rainfall fell in December 2010 with approximately 8 inches falling in a one week period. This extreme event resulted in a record 90,000 acre-feet of water captured behind Prado Dam, most of which, was released to the ocean. The rain received in the Santiago Creek watershed was a 100-year event which caused Irvine Lake to spill and resulted in releases of up to 3,000 cubic feet per second from Villa Park Dam to the Santiago Basins. In December 2010, the Santiago Basins were nearly empty, containing over 11,000 acre-feet of storage space after having been pumped down all summer and fall. The releases from Villa Park Dam filled the Santiago Basins in one week. Combined, storm flow capture from the Santa Ana River and Santiago Creek totaled 80,087 acre-feet, which is well above the recent 10-year average of 57,460 acre- feet. The above average rainfall also resulted in above-average incidental recharge, which totaled 94,484 acre-feet in 2010-11. This is well above the recent 10-year average of 65,951 acre-feet and supplied 25 percent of the total recharge to the basin in 2010-11. Over the past three years, the base flows of the Santa Ana River have been relatively constant at approximately 100,000 acre-feet per year with the 2010-11 base flow of 104,469 acre-feet only 1,870 acre-feet more than 2009-10 flows. Nevertheless, compared to the last 10 years, 2010-11 base flow is 20 percent below average. Imported water recharge was higher in 2010-11 compared to recent years because of deliveries to fill the Metropolitan Water District of Southern California’s storage account (16,500 acre-feet) and the availability of discounted replenishment water, which was made available in May 2010 after a three-year hiatus. Even with these deliveries, imported water deliveries were 40 percent below the 10-year average. The Groundwater Replenishment System (GWRS) provided 66,084 acre-feet of recycled water to the surface water and seawater barrier recharge systems, which represents a historic high volume of GWRS water recharged to the basin. In total, recycled water from the GWRS and Alamitos Barrier provided 17 percent of water recharged to the basin in 2010-11. Over the past three years, seawater barrier recharge has been steady ranging from 35,000 to 38,000 acre-feet per year. Protective elevations have been reached in the Talbert Gap, requiring GWRS flows to be shifted from the barrier to the surface water recharge system. Managed aquifer recharge (MAR), which is the recharge that occurs due to District activities, totaled 290,404 acre-feet in 2010-11, which is four percent above the 10-year average of 278,400 acre-feet per year. Even though storm flow and recycled water recharge were well above average, overall recharge was only slightly above average due to reduced Sana Ana River base flow and reduced imported water recharge. 1 2010-11 Report on Groundwater Recharge in the Orange County Groundwater Basin Total recharge to the groundwater basin in 2010-11 equaled 384,888 acre-feet, which is 12 percent above the 10-year average of 344,354 acre-feet per year. Total recharge to the basin was above average due to high incidental recharge. Table ES-1 and Figure ES-1 show how 2010-11 recharge compares to the previous 10 years. Table ES-1 Recharge Source Summary Source FY10-11 10-Year Avg Increase/ % Increase/ (af) (af) (Decrease) (Decrease) (af) SAR Base Flow (1) 104,469 130,754 (26,285) (20) Storm Flow/Local Water (2) 80,087 57,460 22,627 39 Imported/Purchased Water 39,053 65,568 (26,515) (40) Groundwater (3) 0 2,144 (2,144) (100) Recycled Water (4) 66,795 22,477 44,318 197 Total OCWD Recharge (4) 290,404 278,403 12,001 4 Incidental Recharge 94,484 65,951 28,533 35 Grand Total 384,888 344,354 40,534 12 (1) SAR Base Flow based on OCWD data, which may differ slightly from the SAR Watermaster (see Section 3.2).
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