Folsom Dam Water Control Manual Update Joint Federal Project, Folsom Dam
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1 Folsom Dam Water Control Manual Update Joint Federal Project, Folsom Dam Public Workshop May 25, 2016 Sacramento Library Galleria 828 I Street, Sacramento, CA US Army Corps of Engineers BUILDING STRONG
2 WELCOME & INTRODUCTIONS 2
3 PURPOSE OF MANUAL UPDATE Revise operation rules for Folsom Dam to reduce flood risk based on the capabilities of the Folsom Joint Federal Project (JFP). Reflect operational capabilities created by improved weather forecasts. Potentially reduce the volume of flood control reservation in Folsom Reservoir at any particular time by comparison to the operations that have been in effect since 95 3
4 OBJECTIVES OF MANUAL UPDATE Pass the Probable Maximum Flood while maintaining 3 feet of freeboard below the top of dam to stay within the dam safety constraints of the U.S. Department of Interior, Bureau of Reclamation. Control a 1/100 annual chance flow ( 100-year flood ) to a maximum release of 115,000 cubic feet per second as criteria set by the Sacramento Area Flood Control Agency to support Federal Emergency Management Agency levee accreditation along the American River. Control a 1/200 annual chance flow ( 200-year flood ) as defined by criteria set by the State of California (State) Department of Water Resources to a maximum release of 160,000 cubic feet per second, when taking into account all the authorized modifications within the American River Watershed. 4
5 TODAY S DISCUSSION Tentatively-Selected Plan Environmental Effects of the Tentatively-Selected Plan Project Milestone Schedule 5
6 Water Control Diagrams 1,000 Flood Space (TAF) Storage (TAF) Existing (USACE) Basin Wetness Existing (USBR-SAFCA) Upstream Storage Credit Alternative 1 Upstream storage credit + basin wetness 400 Tentatively Selected Plan (TSP) Forecast 200 Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct 6
7 Forecast-based TOC 7
8 Water Control Diagram 8
9 1986 event pattern scaled to 100-yr Forecast operation reflects perfect forecast USBR/SAFCA US storage Alt. 1 US storage and basin wetness TSP Forecast 9
10 1986 event pattern scaled to 200-yr Forecast operation reflects perfect forecast USBR/SAFCA US storage Alt. 1 US storage and basin wetness TSP Forecast 10
11 1997 event pattern scaled to 100-yr Forecast operation reflects perfect forecast USBR/SAFCA US storage Alt. 1 US storage and basin wetness TSP Forecast 11
12 1997 event pattern scaled to 200-yr Forecast operation reflects perfect forecast USBR/SAFCA US storage Alt. 1 US storage and basin wetness TSP Forecast 12
13 Forecast Ensemble EXAMPLE 133
14 Forecast Ensemble 12/8/
15 Forecast Ensemble 12/9/
16 Forecast Ensemble 12/10/
17 Forecast Ensemble 12/11/
18 Forecast Ensemble 12/12/
19 Forecast Ensemble 12/13/
20 Forecast Ensemble 12/14/
21 Forecast Ensemble 12/15/
22 Forecast Ensemble 12/16/
23 Forecast Ensemble 12/17/
24 Forecast Ensemble 12/18/
25 Forecast Ensemble 12/19/
26 Forecast Ensemble 12/20/
27 Forecast Ensemble 12/21/
28 Forecast Ensemble 12/22/
29 Forecast Ensemble 12/23/
30 Forecast Ensemble 12/24/
31 Forecast Ensemble 12/25/
32 Forecast Ensemble 12/26/
33 Forecast Ensemble 12/27/
34 Forecast Ensemble 12/28/
35 Forecast Ensemble 12/29/
36 Forecast Ensemble 12/30/
37 Forecast Ensemble 12/31/
38 Forecast Ensemble 1/1/
39 Forecast Ensemble 1/2/
40 Forecast Ensemble 1/3/
41 Forecast Ensemble 1/4/
42 Forecast Ensemble 1/5/
43 Compute Forecasted Inflow Volumes 1-day 2-day 3-day 5-day 43
44 1997 Event Hindcast Series 3-day volume updated daily 61 ensemble traces 21 probabilistic traces Each trace reflects one value of Non- Exceedence Probability (NEP) 44
45 Robustness Testing Considers uncertainty in forecast indicated by the forecast ensemble. Tests operation using imperfect forecasts. Used to identify operational NEP value. 45
46 Robustness Test Example 1986 event pattern scaled to 200-yr 21 simulations corresponding to NEP values ranging from 0% to 100% (5% increments). Perfect forecast shown as black dashed line for reference. 46
47 Pass 100-yr event at 115 kcfs Pass 200-yr event at 160 kcfs Robustness Summary Project Goals Minimum NEP (%) (1986 / 1997 patterns) 0% / 0% (ALL PASS) 0% / 0% (ALL PASS) Other Metrics of Interest Minimum NEP (%) (1986 / 1997 patterns) Pass 200-yr event at 160 kcfs (24-hr late forecast) 55% / 60% Pass 200-yr event at 115 kcfs 65% / 75% Additional robustness tests and results in Engineering Report 47
48 Regulated Peak Flow-Frequency Best Estimate curves Reflects weighting of 1955, 1964, 1986, 1997 event patterns Starting storages: Folsom at TOC, headwaters at 20% AEP storage Forecast operation using 75% NEP Pending Review 48
49 Summary Both the TSP and Alternative 1 satisfy project goals. The TSP allows larger events to be routed at peak releases of 115 and 160 kcfs. The TSP allows greater storage during winter, and promotes end of event refill. 49
50 ENVIRONMENTAL EFFECTS OF THE TENTATIVELY-SELECTED PLAN
51 FOLSOM DAM OPERATIONS 1,000 Flood Space (TAF) 0 Conservation Pool 800 Storage (TAF) Flood Reservation Pool Variable Space Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Existing WCD 400/670 TAF Flood Space Upstream Storage Credit Tentatively Selected Plan 400/600 TAF flood space Forecasted Inflow Volume WCD = Water Control Diagram
52 TENTATIVELY-SELECTED PLAN WATER CONTROL DIAGRAM 1,000 Conservation Pool 800 Storage (TAF) Flood Reservation Pool Variable Space Tentatively Selected Plan 400/600 TAF flood space Forecasted Inflow Volume 200 Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct 51
53 1,200,000 1,100,000 1,000, ,000 Top of Surcharge Top of Flood Pool 1997 EVENT PATTERN SCALED TO 100-YR 800,000 Storage (ac-ft) 700, , , ,000 Existing Operations 300, , , Simulation Date (January) US storage and basin wetness alternative 250, , ,000 Flow (cfs) 100, ,000 release limit 115,000 release limit Tentatively Selected Plan Forecasted inflow 50, Simulation Date (January)
54 COMPARATIVE MODELING APPROACH AND RESULTS 53
55 LOWER AMERICAN RIVER (LAR) MODELING APPROACH System-Wide Operations Detailed Folsom Operations LAR Water Temperature HEC-5Q Daily timestep Water Temperatures Includes meteorological conditions CalSim 2 Flow & Storage HEC-ResSim Reservoir Releases & Storage Includes inflow temperatures Monthly Timestep Simulates Shasta-Folsom- Trinity-Delta operations Differences in alternatives limited to the Folsom Reservoir topof-conservation Hourly timestep Simulates detailed Folsom Reservoir flood operations Matches CalSim 2 end-of-month storage River Hydraulics HEC-RAS Hourly timestep Includes detailed river geometry River Stages and Flow 54
56 RESERVOIR STORAGE 55
57 Period of Record Hydrology Presents Some Opportunities for Water Supply Benefits 13 of 82 years (16%) provide a benefit to water supply 56
58 Folsom Storage Folsom storage increased during most months Forecast-informed operations allow higher average winter storages Increased spring curve allows greater spring refill 57
59 Folsom End-of-Month Storage Existing Operation vs Tentatively Selected Plan 58
60 FISHERIES 59
61 By species By life stage Fisheries Evaluation Approach Flow & water temperature Spawning habitat Redd dewatering (LAR only) Early life stage mortality (LAR only) Delta parameters 60
62 Evaluated Species at a Range of Locations 61
63 Lower American River Flow Similar most of the time during most months Long-term Average Flows (cfs) Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Existing Operation 2,127 3,082 3,585 4,825 5,441 4,227 3,146 3,639 3,475 3,439 2,434 2,582 Tentatively Selected Plan 2,074 3,005 3,515 4,439 5,025 4,119 3,667 3,767 3,449 3,384 2,411 2,562 Difference Percent Difference During Dry Years Lower During Fall, Higher During Summer Dry Years - Long-term Average Flows (cfs) Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Existing Operation Tentatively Selected Plan 2,172 2,486 1,981 1,718 1,574 2,045 1,798 1,826 2,073 3,270 2,048 1,514 Difference Percent Difference
64 American River Steelhead Spawning Habitat (WUA) Spawning Habitat is at optimal almost 50 percent of the time. More spawning habitat availability with tentatively selected plan than with existing operations. Optimal Spawning Habitat Availability 64
65 American River Steelhead Redd Dewatering Reduced Redd Dewatering Conditions with the tentativelyselected plan than with existing operations 64
66 American River Water Temperature Similar most of the time during most months Warmer during March & April Slightly cooler during May, June, and August under relatively warm conditions Dry Years - Average Temperatures ( F) Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Existing Operation Tentatively Selected Plan Difference
67 American River Fall-Run Chinook Early Life-Stage Mortality Slight improvement to Chinook early life-stage mortality 66
68 Fisheries Evaluation Summary Slight benefits to evaluated species in the Lower American River and CVP/SWP system-wide area Flow fluctuations Water temperature Improved end-of-may storages at Folsom Dam provide for increased cold water pool volumes Improved management of Lower American River temperatures during summer and fall 67
69 RECREATION 68
70 Recreation Metrics Reservoirs Boating Recreation Metric: Reservoir pool elevations vs. boat ramp access elevations Shoreline Recreation Metric: Reservoir pool elevations vs. optimum general recreation elevation and optimum shoreline use elevation 69
71 Reservoir Recreation Folsom Comparison Results Folsom Reservoir Boat Ramp Access Threshold Existing Operations vs. Tentatively-Selected Plan Folsom Reservoir Swim Access Threshold Existing Operations vs. Tentatively-Selected Plan 71
72 Folsom Reservoir Recreation Elevations 71
73 Recreation Metrics American River Boating Recreation Metric: Flow stage vs. acceptable flow ranges for recreational activities and recreational facility availability Consistency of LAR flows with the American River Parkway Plan and the California and National Wild and Scenic Rivers Acts. 72
74 Lower American River Recreation Threshold Difference 73
75 Lower American River Recreation Threshold Difference 74
76 LOWER AMERICAN RIVER TERRESTRIAL HABITAT 75
77 Lower American River Cottonwood Growth No decrease in average number of days for cottonwood radial growth maintenance and optimal growth No substantial difference in peak flows necessary to inundate terraces for cottonwood dispersal and regeneration 76
78 Lower American River Backwater Recharge Minor fluctuation in backwater flows Not enough to alter existing backwater recharge 77
79 FIXED-400,000 AF OPERATION VS. TENTATIVELY-SELECTED PLAN See Hand-Outs 78
80 PROJECT MILESTONE SCHEDULE APRIL 2016 USACE COMPLETES ADMINISTRATIVE DRAFT ENGINEERING REPORT & WATER CONTROL MANUAL UPDATE MAY 2016 APRIL SEPTEMBER 2016 PUBLIC WORKSHOP: TENTATIVELY-SELECTED PLAN & ENVIRONMENTAL EFFECTS OF THIS PLAN USACE/PARTNER REVIEW; USACE-REQUIRED INDEPENDENT SAFETY ASSURANCE REVIEW USACE COMPLETES DRAFT NEPA / CEQA DOCUMENTS AUGUST SEPTEMBER 2016 AUGUST DECEMBER 2016 PUBLIC REVIEW OF DRAFT NEPA / CEQA DOCUMENTS PUBLIC MEETING FOR DRAFT NEPA / CEQA DOCUMENTS OBTAIN BIOLOGICAL OPINION (135-DAY REVIEW) MARCH 2017 APRIL 2017 PUBLIC & ENVIRONMENTAL AGENCIES REVIEW OF FINAL NEPA / CEQA DOCUMENTS 79
81 DISCUSSION 80
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