seminar_ewre
TRANSCRIPT
Client: New Braunfels Utilities (NBU)
Project: Greyfield development
Consultants: EDG, Ten Eyck, Lake Flato
BLIEDERS CREEK
COMAL RIVER
SPRING HEAD
NBU PROPERTY
Site Assessment
NRCS Web Soil Survey
Site Inspection
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
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
Restoration Goals
Protecting the spring
Stormwater
Flood impacts
Restoring the spring
Increasing infiltration
Using stormwater
Flood Impact Mitigation
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
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
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
Acknowledgements
Prof. Howard Liljestrand
Dr. Mark Simmons (Director, EDG)
Emily Manderson, Julia Raish, Darcy Anders (EDG)