Spring Lake Dam - Texas State Universitygato-docs.its.txstate.edu ›...
Transcript of Spring Lake Dam - Texas State Universitygato-docs.its.txstate.edu ›...
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SPRINGLAKEDAM
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Today's Purpose
1. Who is Involved?
2. History of the Dam
3. Plans for Repair
Texas State
USACE
FEMATCEQ
USFWS
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Background
• October 2015 flood
• Damage to Spring Lake Dam
• FEMA Category B grant: “eliminate or
reduce an immediate threat to life, public
health, or safety…”
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Background (cont.)
• FNI hired in May 2017
• Preliminary design submitted to FEMA in September 2017
• FEMA provided formal request for Biological Assessment
from Texas State University in November 2017
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Description of Dam
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Turbine
Race
San Marcos
River
Spring Lake
Embankment
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Concrete Cap
Cedar Cribbing
/Rockfill Embankment
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1961 2017
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(Brief) History
• Original construction: 1849 by Edward Burleson
• Current configuration probably dates to 1909
• Purchased in 1994 by Texas State University
• Major flood in 1998
• West spillway repaired in 2001
• Major floods in 2013 and 2015
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2015 Flood• Overtopped by several feet
• Overtopping continued for overa week
• Disaster declaration
• FEMA PW: Preliminary Scope ofWork
• Riprap repairs (4,000 CY)
• Bentonite blanket upstream
• New Concrete Cap
• $1,065,341
• No change to pre-disasterconditions
• Statutory time limit of 6 months(extensions granted)
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Existing Conditions
• Dam does not currently meet state standards for dam safety and has several outstanding recommendations from TCEQ
• With 160-year history, dam predates modern design and construction principals
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FNI Site Visit
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Habitat Assessment
• Potential Habitat in Project Footprint
– San Marcos Salamander
– Fountain Darter
– San Marcos Gambusia
– Comal Springs Riffle Beetle
– American Eel (not federally-listed)
• May Affect:
– Texas Wild Rice
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November 2015 February 2018
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ConstructionDesign
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Temporary Stabilization • Goal: “eliminate or reduce an immediate threat to life,
public health, or safety.”
• Dam is currently vulnerable to further overtopping flows.
• Temporary stabilization will reduce likelihood of failure and will:
– Reduce seepage to prevent further internal erosion
– Replace lost embankment material
– Level crest to reduce overtopping flow concentration
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Temporary Stabilization
1. Rock riprap in the scoured areas of the downstream
toe of the embankment
2. Repair east spillway slab
3. Install bentonite/aggregate composite along entire
upstream slope of dam
4. Level the low spots of the embankment crest with
installation of a cast-in-place concrete curb.
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Temporary bentonite/ aggregate composite liner
Selective repairs o day liner
Concrete curb to level low areas of crest
Typical Embankment Section
Replace rockfill at d/s toe
Sa v-cut undermined section of spill vay slab
Butt ess vlth rock
East Spillway Section
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Spring Lake Dam
2018
Regulatory
Coordination Meeting
REG
Final Biological
Assessment
BA
Dam Safety
Agreement
TCEQ
Stabilization Begins –
Contractor to be
Determined
TBA
Award Contract
TBA
2019
Projected Possible
Completion
MaySept Oct NovMay June July AugJan Feb Mar April
50% Construction
Drawings
100% Construction
Drawings
Solicit Bids
F&N
F&N
Flood 2015
Anniversary /
Construction Duration
TBD
TXState
TXState
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SPRINGLAKEDAM