Upload
sugar
View
83
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Caddo Lake And Lake O’ Pines. Lake Caddo. Project History Original Dam 1914 Cypress Bayou Navigation Project Reconstruction Began August 1968 Reconstruction Completed June 1971 (COE). Lake Caddo. Project Specific Physical Data 2780 mi 2 of Drainage Area Above Lake Caddo - PowerPoint PPT Presentation
Citation preview
Caddo Lake Caddo Lake
AndAnd
Lake O’ Pines Lake O’ Pines
Caddo Lake Caddo Lake
AndAnd
Lake O’ Pines Lake O’ Pines
Lake CaddoLake Caddo
• Project HistoryProject History• Original Dam 1914Original Dam 1914• Cypress Bayou Navigation ProjectCypress Bayou Navigation Project• Reconstruction Began August 1968Reconstruction Began August 1968• Reconstruction Completed June 1971 (COE)Reconstruction Completed June 1971 (COE)
Lake CaddoLake Caddo
• Project Specific Physical DataProject Specific Physical Data• 2780 mi2780 mi22 of Drainage Area Above Lake of Drainage Area Above Lake
CaddoCaddo• 1900 mi1900 mi22 Uncontrolled Area (68 %) Uncontrolled Area (68 %)• 880 mi880 mi22 Controlled By Lake O’ Pines (32%) Controlled By Lake O’ Pines (32%)• 2400 Spillway @ 168.5 (860 ft) and 170.5 2400 Spillway @ 168.5 (860 ft) and 170.5
(1540 ft)(1540 ft)
Cypress Bayou BasinCypress Bayou Basin
Uncontrolled Area Uncontrolled Area 1900 mi1900 mi2 2 or 68%or 68%
Total Drainage Area Total Drainage Area Above Caddo 2780 miAbove Caddo 2780 mi22
Lake CaddoLake Caddo
• Operational or Regulation PlanOperational or Regulation Plan• Uncontrolled Spillway (No Human Uncontrolled Spillway (No Human
Operations Required)Operations Required)• Planning Studies to Look at Modifying Lake Planning Studies to Look at Modifying Lake
Caddo Operation CharacteristicsCaddo Operation Characteristics
Lake Caddo Elevations(1993-2004)
Lake Caddo Elevations(1993-2004)
Lake CaddoLake Caddo
• Historical Flood DataHistorical Flood DataFloodingFlooding Elevation Elevation
DateDate (ft – NGVD)(ft – NGVD)
May 1958May 1958 182.6182.6
May 1966May 1966 180.2180.2
March 2001March 2001 175.3175.3
January 1988January 1988 176.7176.7
April 1989April 1989 176.4176.4
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
• Flooding of Homes & Businesses Around Flooding of Homes & Businesses Around Lake CaddoLake Caddo• Costs Not QuantifiedCosts Not Quantified
• Road Closures Due To High WaterRoad Closures Due To High Water• Overall Damage Cost Not QuantifiedOverall Damage Cost Not Quantified
• Need Available Data of Damage CostsNeed Available Data of Damage Costs
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake Caddo Damages(2001)
Lake CaddoLake Caddo
• Exceedence Probability DataExceedence Probability DataExceedenceExceedence Elevation Elevation
ProbabilityProbability (ft – NGVD)(ft – NGVD)
1 (100-year)1 (100-year) 185.0185.0
2 (50-year)2 (50-year) 182.7182.7
4 (25-year)4 (25-year) 179.3179.3
10 (10-year)10 (10-year) 175.5175.5
20 (5-year)20 (5-year) 173.1173.1
Source: Cypress Bayou Basin, Feasibility Report, February 1987Source: Cypress Bayou Basin, Feasibility Report, February 1987
(2001 – 175.3)(2001 – 175.3)
Lake O’ The PinesLake O’ The Pines
• Project HistoryProject History• Construction Began January 1955Construction Began January 1955• Impoundment Began August 1957Impoundment Began August 1957
• Project PurposeProject Purpose• Flood Control (Flood Control Act of 1946)Flood Control (Flood Control Act of 1946)• Water Supply (Flood Control Act of 1936)Water Supply (Flood Control Act of 1936)
• As Requested By NE TX Municipal Water Dist.As Requested By NE TX Municipal Water Dist.• 100% of Conservation Pool (201 – 228.5 ft NGVD 100% of Conservation Pool (201 – 228.5 ft NGVD
No Flood Storage This Zone)No Flood Storage This Zone)
Lake O’ The PinesLake O’ The Pines
• Project Specific Physical DataProject Specific Physical Data• 880 mi880 mi22 of Drainage Area Above Lake O’ The Pines of Drainage Area Above Lake O’ The Pines• 32% Combined Lake O’ Pines/Lake Caddo Area32% Combined Lake O’ Pines/Lake Caddo Area• 200 ft Uncontrolled Spillway200 ft Uncontrolled Spillway
• Maximum Capacity 68,200 cfsMaximum Capacity 68,200 cfs
• Outlet Works 2 – 8 ft x 12.5 ft GatesOutlet Works 2 – 8 ft x 12.5 ft Gates• Maximum Controlled Release = 3000 cfsMaximum Controlled Release = 3000 cfs
• Top of Conservation Pool 228.5 ft NGVDTop of Conservation Pool 228.5 ft NGVD• Surface area 17,649 ac-ftSurface area 17,649 ac-ft
• Top of Flood Control Pool 249.5 ft NGVDTop of Flood Control Pool 249.5 ft NGVD
Cypress Bayou BasinCypress Bayou Basin
Total Drainage Area Total Drainage Area Above Lake O’ Pines Above Lake O’ Pines 880 mi880 mi22 or 32%or 32%
Total Drainage Area Total Drainage Area Above Caddo 2780 miAbove Caddo 2780 mi22
Lake O’ The PinesLake O’ The Pines
• Real EstateReal Estate• Federal Ownership to 236 ft NGVD (29,105 Federal Ownership to 236 ft NGVD (29,105
acres)acres)• Federal Easements 236 – 254.5 ft NGVD Federal Easements 236 – 254.5 ft NGVD
(16,320 acres)(16,320 acres)• Damage to Structures Begin Around 242 ft Damage to Structures Begin Around 242 ft
NGVDNGVD
Lake O’ The PinesLake O’ The Pines
• Operational or Regulation PlanOperational or Regulation Plan• GuidelinesGuidelines
• Evacuate as quickly as possible to prepare for subsequent Evacuate as quickly as possible to prepare for subsequent flooding eventsflooding events
• Prevent uncontrolled spillway flows when possiblePrevent uncontrolled spillway flows when possible• Control 3000 cfs except when Shreveport stage > 31 ft Control 3000 cfs except when Shreveport stage > 31 ft **
• Total of gaged flows for Little, Black and Big Cypress Total of gaged flows for Little, Black and Big Cypress Jefferson gages not to exceed 7000 cfsJefferson gages not to exceed 7000 cfs
• Rule Curve – 230.0 (May – Sept.), otherwise 228.5Rule Curve – 230.0 (May – Sept.), otherwise 228.5
*Note: Structural and flooding factors limit releases to 3000 cfs even though outlet *Note: Structural and flooding factors limit releases to 3000 cfs even though outlet works are capable of releasing more.works are capable of releasing more.
Pines Operating Rule CurvePines Operating Rule Curve
1 Day @ 200 cfs1 Day @ 200 cfs
1 Day @ 500 cfs1 Day @ 500 cfs
1 Day @ 1000 cfs1 Day @ 1000 cfs
1 Day @ 1800 cfs1 Day @ 1800 cfs
1 Day @ 3000 cfs1 Day @ 3000 cfs
1 Day @ 1800 cfs1 Day @ 1800 cfs
1 Day @ 1000 cfs1 Day @ 1000 cfs
1 Day @ 500 cfs1 Day @ 500 cfs
1 Day @ 200 cfs1 Day @ 200 cfs
Total VolumeTotal Volume
400 ac-ft400 ac-ft
1000 ac-ft1000 ac-ft
2000 ac-ft2000 ac-ft
3600 ac-ft3600 ac-ft
6000 ac-ft6000 ac-ft
3600 ac-ft3600 ac-ft
2000 ac-ft2000 ac-ft
1000 ac-ft1000 ac-ft
400 ac-ft400 ac-ft
20000 ac-ft20000 ac-ft
equivalent volumeequivalent volume
equivalent volumeequivalent volume
equivalent volumeequivalent volume
equivalent volumeequivalent volume
equivalent volumeequivalent volume
equivalent volumeequivalent volume
equivalent volumeequivalent volume
equivalent volumeequivalent volume
equivalent volumeequivalent volume
Lake O’ The PinesLake O’ The Pines
Lake O’ The PinesLake O’ The Pines
• Deviation Process• Deviation Required To Regulate Other Than
to Adopted Plan of Regulation• SWF Requests Deviation To Plan• SWD Reviews & Approves or Denies
Lake O’ PinesLake O’ Pines
• Historical Flood DataHistorical Flood DataFloodingFlooding Elevation Elevation
DateDate (ft – NGVD)(ft – NGVD)May 1958May 1958 239.7*239.7*May 1966May 1966 245.4245.4March 2001March 2001 244.7244.7
* Deliberate impoundment began, August 1957 with a starting water * Deliberate impoundment began, August 1957 with a starting water surface elevation of 208.42. Maximum pool elevation of 246.5 surface elevation of 208.42. Maximum pool elevation of 246.5 would have resulted if the flood would have occurred on a normal would have resulted if the flood would have occurred on a normal pool level of 228.5. pool level of 228.5.
Lake O’ Pines Elevations(1993-2004)
Lake O’ Pines Elevations(1993-2004)
Lake O’ PinesLake O’ Pines
• Exceedence Probability DataExceedence Probability DataExceedenceExceedence Elevation Elevation
ProbabilityProbability (ft – NGVD)(ft – NGVD)
1 (100-year)1 (100-year) 253.5253.5
2 (50-year)2 (50-year) 249.5249.5
10 (10-year)10 (10-year) 239.3239.3
20 (5-year)20 (5-year) 235.4235.4
Notable Historical FloodsNotable Historical Floods
• December – March 2001December – March 2001• Maximum Precipitation 30”Maximum Precipitation 30”• Basin Average Precipitation 28”Basin Average Precipitation 28”• Peak Inflow /Elevation of 25,000 cfs/244.7 ft NGVDPeak Inflow /Elevation of 25,000 cfs/244.7 ft NGVD
• 23 April – 2 May 196623 April – 2 May 1966• Maximum Precipitation 24.5”Maximum Precipitation 24.5”• Basin Average Precipitation 17.5”Basin Average Precipitation 17.5”• Peak Inflow/Elevation of 38,600 cfs/245.4 ft NGVDPeak Inflow/Elevation of 38,600 cfs/245.4 ft NGVD
• 25 April – 4 May 195825 April – 4 May 1958• Maximum Precipitation 18.1”Maximum Precipitation 18.1”• Basin Average Precipitation 15.3”Basin Average Precipitation 15.3”• Peak Inflow/Elevation of 69,200 cfs/239.7 (246.9) ft NGVDPeak Inflow/Elevation of 69,200 cfs/239.7 (246.9) ft NGVD
Lake Caddo & Lake O’ PinesLake Caddo & Lake O’ Pines
• December – March 2001 Flood EventDecember – March 2001 Flood Event• Long Duration EventLong Duration Event• Extremely High Rainfall AccumulationsExtremely High Rainfall Accumulations
• Pines Basin Average 27.3”Pines Basin Average 27.3”• Caddo Basin Average 28.3”Caddo Basin Average 28.3”
• Continued Rainfall Prevented EvacuationContinued Rainfall Prevented Evacuation
Cypress Bayou Basin(December 2000 – March 2001 Rainfall)
Cypress Bayou Basin(December 2000 – March 2001 Rainfall)
Lake Caddo InflowLake Caddo Inflow
Caddo Inflow w/ Pines % Pool OccupiedCaddo Inflow w/ Pines % Pool Occupied
Lake Caddo ElevationsLake Caddo Elevations
Lake O’ Pines Inflow & ReleaseLake O’ Pines Inflow & Release
Lake O’ Pines ElevationsLake O’ Pines Elevations
• Flooding of Homes & Businesses Around Lake Flooding of Homes & Businesses Around Lake O’ PinesO’ Pines• Costs Not QuantifiedCosts Not Quantified
• Damage to Spillway Approach, Parks, Damage to Spillway Approach, Parks, Recreational & Other Government FacilitiesRecreational & Other Government Facilities• $1,155,000 ($900,000 Spent to Date)$1,155,000 ($900,000 Spent to Date)
• MarinasMarinas• Costs Not QuantifiedCosts Not Quantified
• Road Closures Due To High WaterRoad Closures Due To High Water• Overall Damage Costs Not QuantifiedOverall Damage Costs Not Quantified• Splitter wall failed below outlet worksSplitter wall failed below outlet works
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Damages(2001)
Lake O’ Pines Erosion(2001)
Lake O’ Pines Erosion(2001)
SummarySummary
• Operational Plan for Lake O’ Pines Operational Plan for Lake O’ Pines • Limit, Not Totally Prevent, Downstream FloodingLimit, Not Totally Prevent, Downstream Flooding• Minimize Uncontrolled Spillway DischargesMinimize Uncontrolled Spillway Discharges• Ensure Safety of DamEnsure Safety of Dam
• Limited Flood Storage In Lake O’ PinesLimited Flood Storage In Lake O’ Pines• Flood Water Must Be Quickly EvacuatedFlood Water Must Be Quickly Evacuated• Majority of Runoff into Lake Caddo is From the Majority of Runoff into Lake Caddo is From the
Uncontrolled Area (68 %)Uncontrolled Area (68 %)• Historically Lake O’ Pines Reduces Lake Caddo Historically Lake O’ Pines Reduces Lake Caddo
Elevations 3-5 ftElevations 3-5 ft• The 2001 Flood Was a 10-year EventThe 2001 Flood Was a 10-year Event
Lake CaddoLake Caddo
• Recent Planning Studies For Lake CaddoRecent Planning Studies For Lake Caddo• Reconnaissance Report, Cypress Valley Reconnaissance Report, Cypress Valley
Watershed, Texas, September 1995Watershed, Texas, September 1995• Environmental EmphasisEnvironmental Emphasis• Flood Reduction Options for Caddo Lake Flood Reduction Options for Caddo Lake
IncludedIncluded• More Efficient SpillwayMore Efficient Spillway• Downstream Channelization of Twelvemile BayouDownstream Channelization of Twelvemile Bayou
• No Local Sponsor IdentifiedNo Local Sponsor Identified
Lake O’ Pines & Caddo Elevations(1993-2004)
Lake O’ Pines & Caddo Elevations(1993-2004)
Lake O’ Pines Outflows(1999-2001)
Lake O’ Pines Outflows(1999-2001)
Lake O’ Pines Outflows(2002-2004)
Lake O’ Pines Outflows(2002-2004)
Questions?Questions?