NFIE-RESPONSE IN TRAVIS COUNTY, TX Presented by, Cassandra Fagan May 6, 2015.

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Presentation transcript:

NFIE-RESPONSE IN TRAVIS COUNTY, TX Presented by, Cassandra Fagan May 6, 2015

NFIE Components:

Connecting NFIE Flood Forecasts to Roadway Flooding Rating Curve at Low Water Crossing

Flash Flood Alley

Rollingwood, TX Low Water Crossings Travis County

Importance of these roadways New Development on Bee Caves Road

Survey: Culverts were in poor condition and in need of maintenance Inlet versus Outlet Conditions Eanes Creek at Bee Caves Road Low Water Crossing Eanes Creek at Edgegrove Drive Low Water Crossing Eanes Creek at Dellana Lane Low Water Crossing Inlets Outlets

LiDAR Dataset to TIN Road Type:2 Lanes each direction Road Classification:Major Arterial AADT2010 :32,144

Two Methods of Generating a Rating Curve in CulvertMaster: Quick Calculator Maximum headwater elevation is the flooding threshold Benefit: Fewer data points required Drawbacks: Constant road elevation assumed Only one culvert size can be analyzed Analysis Enter station elevations across roadway – flooding threshold Overtopping of roadway modeled as a broad crested weir Benefit: Calculates rating curve of road LWCs with various culvert sizes can be analyzed Drawback: More data required

Road Profiles

Eanes Creek Cross Sections

Color assigned to culvert locations according to risk provided from streamflow forecast & rating curve

Rating Curves from CulvertMaster Eanes Creek at Bee Caves Road Low water Crossing design flow = 139 cfs

Future Work Compare results from arial LiDAR survey results to land based LiDAR results Model culverts with blockages – possibly by increasing the entrance loss coefficients Using Richard’s code, extract cross-sections for Eanes Creek rather than doing it manually