seminar_ewre

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)