in Austin Texas By Kiersten Dube Shoal Creek Detention Pond Q Can rain gardens replace pond MOPAC Far West Blvd Shoal Creek Lidar to DEM High Low ArcGIS Help page Lidar to raster ID: 808827
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Slide1
Rain Gardens as Flood Control
in Austin, Texas
By Kiersten Dube
Slide2Shoal Creek Detention Pond
Q: Can rain gardens replace pond?
MOPAC
Far West Blvd
Shoal Creek
Slide3Lidar to DEM
High
Low
ArcGIS
Help page “
Lidar
to raster”
Slide4Stream Lines and
Flow Accumulation
MOPAC
Far West Blvd
AGREE
50 ft
15 ft
Slide5Delineate Watershed
Far West Blvd
Area = 107 acres
Slide6Single Family Homes
Slide7Revised Question
Can rain gardens provide flood control for commercial property?
CivicMulti-family
Office
Roads
Slide8Assumption
Pond
=
Rain Gardens
Σ
time
cfs
Pond
Vol
=
Σ
(Rain Garden
Vol
)
Slide9Pond Volume:
Cut and Fill Tool
DEM
Artificial DEM
Cut
Cut
Fill
Fill = Pond Vol = 2.06 x 106 cubic feet
Weir
Pond
Slide10Rain Garden Design
Soil Porosity = 0.2
4 in.
30 in.
10 in.
1.25 in.
Equivalent
Storage
Depth
Slide11Feasibility Assessment
=
Pond VolEquivalent RG Depth
Rain Garden Area
=
RG Area
Watershed Area
53%
=
Pervious Cover
Per Lot56%
?
=5757
107=Acres
Slide12Conclusions
Can rain gardens replace pond? Tentative No
Consider other optionsPervious pavingRoof top gardensMore complex RG designsRemaining questions
MaintenanceWater quality from roads