seminar_ewre
TRANSCRIPT
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Client: New Braunfels Utilities (NBU)
Project: Greyfield development
Consultants: EDG, Ten Eyck, Lake Flato
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BLIEDERS CREEK
COMAL RIVER
SPRING HEAD
NBU PROPERTY
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Site Assessment
NRCS Web Soil Survey
Site Inspection
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0
100
200
300
400
500
1931 1941 1951 1961 1971 1981 1991 2001 2011
Me
an
An
nu
al
Dis
ch
arg
e (
cfs
)
Comal River Discharge
-20
-15
-10
-5
0
2000 2001 2002 2003 2004 2005 2006
De
pth
(f
ee
t)
Groundwater levels near NBU site
0
200
400
600
800
1/1981 1/1987 1/1993 1/1999 1/2005 1/2011
Pre
cip
ita
tio
n
(mm
)
Monthly Precipitation Estimates
Hydrologic Data
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Location Measured (in/hr) Measured (μm/s) Oakalla Silty Clay Loam (μm/s)
Point 1 0.240 1.693 9.0
Point 2 0.216 1.524 9.0
Point 3 0.106 0.748 9.0
Saturated Hydraulic Conductivity
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Restoration Goals
Protecting the spring
Stormwater
Flood impacts
Restoring the spring
Increasing infiltration
Using stormwater
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Flood Impact Mitigation
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Stormwater Management
Reducing surface runoff
Rainwater harvesting, Vegetative buffer zones
Redirecting runoff away from the spring head
Flow splitters, Pool and riffle systems
Treating surface runoff
Bioswales, Checkdams
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Rainwater Harvesting
0.00
1.00
2.00
3.00
4.00
5.00
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rai
nfa
ll (i
nch
es)
New Braunfels Rainfall: Monthly Medians
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Rainwater Harvesting
Runoff volume = Roof area X Rainfall depth X Curve number
Building Roof Area (sq. feet) Runoff (gallons) Cistern Size (gallons)
Flex Space 9,600 158,486 52,829
Historic Building 1 3,744 61,810 20,603
Historic Building 2 1,680 27,735 9,245
Main Complex 21,440 353,952 117,984
Community Halls 7,584 125,204 41,735
Totals 44,048 727,187 242,396
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Acknowledgements
Prof. Howard Liljestrand
Dr. Mark Simmons (Director, EDG)
Emily Manderson, Julia Raish, Darcy Anders (EDG)