evaluation of a porous concrete bmp: the hydrologic perspective
DESCRIPTION
Evaluation of a Porous Concrete BMP: The Hydrologic Perspective. CEE Day Villanova University April 25, 2003 Tyler C. Ladd. Outline. Problem Solution Research Objectives Conclusions. Problem. Urbanization Increased impervious cover Increased flood flows Decreased baseflows - PowerPoint PPT PresentationTRANSCRIPT
Evaluation of a Porous Concrete BMP: The Hydrologic Perspective
CEE Day Villanova UniversityApril 25, 2003Tyler C. Ladd
Outline
• Problem• Solution• Research Objectives• Conclusions
Problem
• Urbanization• Increased impervious cover• Increased flood flows • Decreased baseflows• Increased downstream erosion and sedimentation• Aquatic habitat degradation• Impaired water resources• Government mandates
Solution
• Best Management Practices (BMPs)– Porous Concrete– Infiltration Beds
• Research to support implementation– 97 - 100% Effective
Research Objectives
• Effectiveness of rainfall infiltration• Compare pre- and post-construction• Effect of antecedent dry days• Computer model• Long-term effectiveness
Pre-Construction
Infiltration Beds
Post-Construction
Post-Construction
Porous Concrete in ActionPorous Concrete (foreground) during a rain storm
Re-construction
Summer 2003
Water Content Reflectometers
Water Content Reflectometers
3/20/03 3/21/03 3/22/03 3/24/03 3/25/03D ate
0.2
0.3
0.4
0.5
0.6
0.7
Vol
umet
ric W
ater
Con
tent
0.2
0.16
0.12
0.08
0.04
0
Rai
nfal
l (in
)
A11 W ater Content Reflectom eter - One Foot DownA12 W ater Content Reflectom eter - Two Feet DownA13 W ater Content Reflectom eter - Four Feet DownR ainfall
Rain Gage, Pressure Transducer, and V-Notch Weir
V-Notch WeirPressure Transducer
Rain Gage
V-Notch Weir
3/20/03 3/21/03 3/22/03 3/24/03 3/25/03D ate
0
0.005
0.01
0.015
0.02
0.025
Wei
r Out
flow
(cfs
)
0.2
0.16
0.12
0.08
0.04
0
Rai
nfal
l (in
)
W eir O utflowR ainfa ll
0.05 inches of precipitation
Preliminary Model Results• March 20, 2003 – 1.81 inches• 97% Effective
Losses - 0 .6 inches
U pper B ed Infiltra tion - 0 .51 inches
M idd le Bed Infiltra tion - 0 .5 inchesLow er Bed Infiltra tion - 0 .15 inches
O bserved O utflow - 0 .05 inches
Preliminary Model Results• March 26, 2003 – 0.32 inches• 100% Effective
Losses - 0.21 inches
U pper Bed Infiltra tion - 0 .05 inchesM idd le Bed Infiltra tion - 0 .05 inches
Lower Bed Infiltration - 0 .01 inchesO bserved O utflow - 0.00 inches
Conclusions
• Exceeds hydrologic design expectations
• Relate storm size to BMP effectiveness
• More storms needed for better calibration
Funding and Acknowledgements
• Pennsylvania Department of Environmental Protection• Villanova University
• Dr. Robert Traver• Dr. Andrea Welker• Clay Emerson• Michael Kwiatkowski• Matthew Prokop• Matthew Rea
Questions?