450,000 400,000 350,000 300,000 250,000 200,000 150,000 Instream Flow Study for the Proposed Lower Bois d Arc Creek Reservoir, Texas 100,000 50,000 0 Jan-48 Jan-51 Jan-54 Jan-57 Jan-60 Jan-63 Jan-66 Jan-69 Jan-72 Jan-75 Jan-78 Jan-81 Jan-84 Jan-87 Jan-90 Jan-93 Jan-96 BY JON ALBRIGHT RiverWare Users Group February 1, 2012
Topics Lower Bois d Arc Creek Reservoir Instream Flow Study Challenges modeling environmental flows associated with the Texas Instream Flow Program
Lower Bois d Arc Cr Reservoir Owner North Texas Municipal Water District Surface Area 16,526 acres Drainage Area 327 sq. miles Storage 367,609 ac-ft Supply 113 MGD Ector Avg/Max Depth 22 ft/70 ft Elevation 534 ft msl Ravenna Proposed Reservoir Bonham Dodd City Windom Honey Grove Ladonia Leonard
Instream Flow Study Based on Texas Instream Flow Program Multidiscipline Field work Modeling Objectives Characterize existing conditions Evaluate impacts of the proposed reservoir on Bois d Arc Creek Recommend a flow regime to maintain a Sound Ecological Environment
Sound Ecological Environment Stream power to move sediment, but not create excessive erosion Support mesohabitat diversity Provide hydraulic connectivity Maintain water quality Support fish reproduction Maintain or improve fish and macroinvertebrate communities
Study Components Hydrology and Hydraulics Flows over time (seasonally and long-term) Hydraulic connectivity to support biology
Study Components Hydrology and Hydraulics Flows over time (seasonally and long-term) Hydraulic connectivity to support biology Fluvial Geomorphology Sediment transport Mesohabitats
Study Components Hydrology and Hydraulics Flows over time (seasonally and long-term) Hydraulic connectivity to support biology Fluvial Geomorphology Sediment transport Mesohabitats Biology Fish and macroinvertebrates
Study Components Hydrology and Hydraulics Flows over time (seasonally and long-term) Hydraulic connectivity to support biology Fluvial Geomorphology Sediment transport Mesohabitats Biology Fish and macroinvertebrates Water Quality Dissolved oxygen and temperature
Hydrology Data Sources and Models: USGS gages (Bois d Arc Creek, North Sulphur, others) Field data Cross-section surveys and LiDar survey HEC-RAS (hydraulics and habitat modeling) Full model high flows Reach models low flows RiverWare (long-term watershed modeling)
Hydrology Limited historical data Drainage area ratios and rainfall/runoff trends Monthy Red River WAM flows to daily Long-term behavior from RiverWare models Channelization Flashy (rapid rise and fall) Frequent high flows cause erosion Extended periods of little to no flow
Flow Duration Curves 10000 Average Daily Flow (cfs) 1000 100 10 1 0.1 Full Period April-June July-October November-March 0% 20% 40% 60% 80% 100% Percent of Time Equaled or Exceeded
Existing Conditions Three Reservoirs Lake Bonham Coffee Mill Lake Crockett Lake One water users Three reach objects Four control points Lake Bonham to Red River
Future Conditions Four Reservoirs Lake Bonham Coffee Mill Lake Crockett Lake Lower Bois d Arc Cr Reservoir Two water users Three reach objects Two control points
Reservoir Storage 450,000 400,000 350,000 300,000 Storage (ac-ft) 250,000 200,000 150,000 100,000 50,000 0 Jan-48 Jan-50 Jan-52 Jan-54 Jan-56 Jan-58 Jan-60 Jan-62 Jan-64 Jan-66 Jan-68 Jan-70 Jan-72 Jan-74 Jan-76 Jan-78 Jan-80 Jan-82 Jan-84 Jan-86 Jan-88 Jan-90 Jan-92 Jan-94 Jan-96 Jan-98 Date Lower Bois d'arc Storage 40% of Conservation Storage Conservation Storage
Proposed Flow Regime Flow Component Release Amount* (cfs) Condition Subsistence 1 Drought Duration Based on Conditions * Subsistence flow triggered when reservoir is less than 40 percent full. Pulse flow would be released seasonally if such flows do not occur naturally.
Proposed Flow Regime Flow Component Release Amount* (cfs) Condition Subsistence 1 Drought Duration Based on Conditions Baseflow a 3 Normal Wet July March Baseflow b 10 Normal Wet April June * Subsistence flow triggered when reservoir is less than 40 percent full. Pulse flow would be released seasonally if such flows do not occur naturally.
Proposed Flow Regime Flow Component Release Amount* (cfs) Condition Subsistence 1 Drought Duration Based on Conditions Baseflow a 3 Normal Wet July March Baseflow b 10 Normal Wet April June High Flow Pulse 50 Normal Wet 1 in spring 1 in summer * Subsistence flow triggered when reservoir is less than 40 percent full. Pulse flow would be released seasonally if such flows do not occur naturally.
Proposed Flow Regime Flow Component Release Amount* (cfs) Condition Subsistence 1 Drought Duration Based on Conditions Baseflow a 3 Normal Wet July March Baseflow b 10 Normal Wet April June High Flow Pulse 50 Normal Wet 1 in spring 1 in summer Overbank Flows NA NA NA * Subsistence flow triggered when reservoir is less than 40 percent full. Pulse flow would be released seasonally if such flows do not occur naturally.
Proposed Flow Regime 10,000.0 1,000.0 Average Daily Flow (cfs) 100.0 10.0 Post Dam Full Period Pre-Dam Full Period 1.0 0.1 0% 20% 40% 60% 80% 100% Percent of Time Equaled or Exceeded
Challenges Modeling TIFP Base and pulse flows Monthly water availability models Pulses Identification Prediction Credit for pulses Without a release With a partial release
Status The proposed instream flow regime for the Lower Bois d Arc Creek Reservoir is under review by the Texas Commission on Environmental Quality as part of its processing of the North Texas Municipal Water District s application for a water right permit for the project. No approval or acceptance of the proposed flow regime has been issued by any state or federal regulatory agency as of this date.
Acknowledgements Project Sponsor: North Texas Municipal Water District Field Data Collection: Texas Commission on Environmental Quality Texas Parks and Wildlife Department Texas Water Development Board Freese and Nichols, Inc. Technical analyses: Simone Kiel Steve Watters Stephanie Coffman Randall Howard