David Coffman, M.S. & Becky Griffith, Ph.D. July 31, 2013
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1 David Coffman, M.S. & Becky Griffith, Ph.D. July 31, 2013
2 Texas River Basins
3
4 Sulphur River Watershed Sediment
5 Sulphur River Watershed Sediment
6 Sulphur River Watershed Sediment
7 Sulphur River Watershed Sediment
8 Minimum 5 Year Average Availability (Acre-Feet) Canadian Nueces San Antonio Guadalupe Lavaca Colorado Red Brazos Sulphur San Jacinto Trinity Cypress Neches Sabine
9 Placeholder for fig 2-1
10 Alternative Storage Sites
11 Initial Yield - Wright Patman Bottom of Conservation Pool at 220 ft Max Conservation Pool Elevation (feet) Firm Yield (AFY) Yield above Current Contract (AFY)* Interim 40,263 0 Ultimate 201,413 21, ,693 75, , , , , , , , , ,034, , ,155, , ,208,533 1,028,533 * 180,000 af/yr
12 Initial Yield, Alternative Sites (acre-feet/yr) Reservoir Initial Yield George Parkhouse I 124,300 George Parkhouse II 124,200 Marvin Nichols IA 590,000 Jim Chapman Lake Reallocation ( increase) 25,000
13 Initial Yield, Talco Configurations (acre-feet/yr) Maximum Elevation Configuration 1 Configuration 2 Configuration cfs Pumping Rate 2500 cfs Pumping Rate 500 cfs Pumping Rate 2500 cfs Pumping Rate ,200 81,700 96, , , , , , , , , , , , , , , , , ,400
14 Wright Patman Storage Losses Original (1956) storage capacity: 158,000 ac-feet 1997 Volumetric Survey: 115,715 ac-feet 2010 Volumentric Survey: 97,927 ac-feet Estimated Annual Storage Loss due to Sediment: acre-feet (TWDB, 2012)
15 Yield Generic Yield Curve over Time Perfect World No Problem Time
16 Yield Generic Yield Curve over Time Perfect Word No Problem Time
17 Yield Generic Yield Curve over Time Perfect Word No Problem Time
18 Soil and Water Assessment Tool SWAT Predict effects of management on water, sediment, nutrient, and pesticide yields on large, un-gaged river basins Dr. Jeffery Arnold, USDA-ARS 30 years of continuous model development
19 Soil and Water Assessment Tool University of Chicago, 2012
20 SWAT Model
21 Average Annual Total Yield
22 Average Annual Sediment Load
23 Wright Patman Yields over Time Minimum Elevation 220 ft Max Elevation (feet) Interim Curve Sediment Condition Firm Yield (AFY) 38,953 Ultimate Curve 196, (without Ralph Hall) 251, , ,031,993 Interim Curve 37,713 Ultimate Curve 192, (with Ralph Hall) 240, , ,025,243 Interim Curve 34,283 Ultimate Curve 180, (with Ralph Hall) 220, , ,014,063
24 Alternative Project Yields over Time (acre-ft/yr) Reservoir Initial 2070 Parkhouse I 124, ,500 Parkhouse II 124, ,000 Marvin Nichols IA 590, ,300 Talco (350) 204, ,000 Talco (370) 320, ,400
25 Modified Sediment Condition ( Intensive Scenario) Six Best Management Practices simulated in SWAT model Filter Strips Terracing Cropland to Pasture Conversion Critical Pasture Planting (perennial grasses) In-channel Grade Control Riparian Buffer Strips Ten of 28 sub basins targeted
26 Land and Channel BMPs
27 Number/Extent of BMP s Simulated ( Intensive Scenario) 10 Sub basins Total Area = 1,539,883 acres Filter Strips = 1,564 acres Terrace = 118,891 acres Cropland to Pasture = 154,619 acres Critical Pasture Planting = 1,310,466 linear feet Channel Grade Control 352,788 linear feet Approximately 22, 3-foot drops Riparian Buffer Strip = 702,096 linear feet
28 Feasible Scenario Based on initial results, number of BMP s reduced to four: Filter Strips Cropland to Pasture Conversion In-channel Grade control Riparian Buffer Strips
29 Reduction in Sediment Yield for Targeted Sub basins Sub basin Existing Conditions Intensive BMP Scenario (Metric tons/hectare) Feasible BMP Scenario Intensive BMP Scenario (% reduction) Feasible BMP Scenario
30 Average Annual Sediment Load
31 Feasible BMP Scenario - Load
32 Bottom Line Reduced sediment loads to Wright Patman Lake Intensive BMP Scenario - 31% (240,767 metric tons per year) Feasible BMP Scenario - 28% (223,518 metric tons per year) Benefits to other reservoirs and riparian landowners would be additive to Wright Patman benefits have not yet been estimated
33 Modified Sediment Conditions Average Annual Sediment Load (metric tons) Reservoir Sediment Load Reduction in Comparison with Baseline Wright Patman Sediment Load Reduction in Comparison with Baseline Parkhouse I 34,149 89, , ,323 Parkhouse II 24, , ,294 91,316 Marvin Nichols IA 216, , , ,127 Talco 39, , , ,941
34 Water Availability Modeling Results Modified Watershed Conditions
35 Effect of Sediment Modification on Reservoir Yield Results of Feasible scenario only Future yields based on storage reduction compared to existing condition WAM modified to reflect altered: Storage volume/surface area relationship Available storage at various elevations Sediment loads converted to volume based on measured density from core samples at Wright Patman Available storage modified based on reduced loss
36 Wright Patman Yield under Mitigated Sediment Condition Conservation Pool Max Elevation (feet) Interim Curve Sediment Condition Firm Yield (AFY) Sediment Condition Firm Yield (AFY) Increase in Firm Yield due to BMPs (AFY) 38,953 38,953 0 Ultimate Curve 196, , , , , , ,031,993 1,031,993 0 Interim Curve 37,713 38, Ultimate Curve 192, (with 194,013 1, ,633 Feasible BMPs) 244,113 3, , ,323 2, ,025,243 1,027,243 2,000 Interim Curve 34,283 35,983 1,700 Ultimate Curve 180, (with 186,113 5, ,153 Feasible BMPs) 230,303 10, , ,533 7, ,014,063 1,019,333 5,270
37 Reservoir Yield under Mitigated Sediment Condition (acre-feet/yr) Reservoir 2030 Yield 2070 Yield Improvement in 2070 Yield Parkhouse I 124, , Parkhouse II 124, ,900 2,900 Marvin Nichols IA 589, ,400 5,100 Talco (350) 204, , Talco (370) 320, ,
38 Yield Results Perfect Word No Problem Time
39 Yield Results Perfect Word No Problem Time
40 Cumulative Savings Feasible BMP Scenario (acre-ft) Reservoir Priority Wright Patman (227.5 ft msl) 240,000 Wright Patman (237.5 ft msl) 170,000 Wright Patman (252.5 ft msl) 130,000 Parkhouse I 8,000 Parkhouse II 59,000 Marvin Nichols IA 104,000 Talco (350) 76,000 Talco (370) 6,000
41 Additional Benefits Landowners Transportation Environmental Additional Needs Assess additional benefits Quantify cost Estimate participation Study Effect of reservoir shoreline erosion
42 Thank you! David K. Coffman, M.S. Environmental Science & Remediation Group office Becky Griffith, Ph.D. Water Resource Planning Group office Freese and Nichols, Inc International Plaza, Suite 200 Fort Worth, TX
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