Purdue Status Report Summer Meeting 2012 Midwest Spatial Decision Support Interest Group Region 5 EPA July 9, 2012 Bernie Engel, Larry Theller, Youn Shik Park, Laurent Ahiablame. Agricultural and Biological Engineering Purdue University
Jan 14, 2016
Purdue Status Report
Summer Meeting 2012
Midwest Spatial Decision Support Interest Group
Region 5 EPA
July 9, 2012
Bernie Engel, Larry Theller, Youn Shik Park, Laurent Ahiablame. Agricultural and Biological Engineering
Purdue University
Topics• L-THIA LID improvements
• Fox River Project update (L-THIA Owls)
Effectiveness of low impact development practices in two urbanized watersheds:
Retrofitting with rain barrels/cisterns and porous pavements
Laurent Ahiablame
Prof. Bernard Engel, Prof. Indrajeet Chaubey
4
How effective are LID practices at the watershed scale? LID practices - lot level control measures
Current focus of research – runoff management with LID practices. Impacts of LID practices on baseflow need to be investigated
at the lot scale at the watershed scale
The Problem
How to Proceed? Monitoring – most appropriate (perhaps),
expensive, time consuming, sometimes impossible.
Modeling – convenient, less expensive, time efficient, sometimes may be complex.
Modeling – L-THIA-LID
L-THIA Modeling of LID Practices
Standard procedure for LID modeling Representation of LID practices
CN values Consideration of design guidelines
Sizing factors Computation of runoff, baseflow, total flow
Threshold area: IF watershed area ≥ 120 ha => baseflow Computation of LID effectiveness index
Baseflow core equation Regression model for Indiana conditions
Relationship between baseflow and LID practice
BFI versus CN
Baseflow pollutant coefficients
Improving L-THIA-LID
LID practices currently represented in L-THIA-LID Bioretention/rain garden Open wooded space Porous pavement Swale Porous pavement + swale Permeable patio Green roof Disconnected impervious surfaces
Improving L-THIA-LID
L-THIA-LID Interface (VBA)
Runoff (distributed approach)2( 0.2 )
( 0.8 )
P S
QP S
P Ia
0Q P Ia
Baseflow0.953 1.424 1.26029.896bQ BDA APCP BFI
LID Effectiveness Index
100 NoLID LID
NoLID
LID
Q QEI
Q
142.100726.0 CNBFI
Little Eagle creek
Little Buck creek
Little Eagle Creek Little Buck CreekLand use Area (ha) Percent Area (ha) PercentLow Density Residential 3872.8 54.8 3273.0 74.1Commercial/Industrial 2260.2 32.0 538.9 12.2High Density Residential 271.0 3.8 1.4 0.0Road/Street 573.6 8.1 366.3 8.3Bare soil 16.0 0.2 - -Grass/Pasture 77.4 1.1 238.2 5.4Total 7070.9 4417.7
Scenario DescriptionS1 existing conditionS2 25% rain barrel/cisternS3 50% rain barrel/cisternS4 25% porous pavementS5 50% porous pavementS6 S2 + S4
Little Eagle Creek Flow (%) TP (%) TN (%)Runoff
Scenario 2 6 5 6
Scenario 3 11 11 12
Scenario 4 3 3 3
Scenario 5 5 5 6
Scenario 6 8 8 9Baseflow
Scenario 2 -1 -1 -1
Scenario 3 -2 -2 -2
Scenario 4 -1 -1 -1
Scenario 5 -1 -1 -1
Scenario 6 -2 -2 -2Total flow
Scenario 2 2 5 3
Scenario 3 5 9 6
Scenario 4 1 2 1
Scenario 5 2 4 3
Scenario 6 4 7 5
LID Scenario Runs: 1991-2010 Effectiveness of LID practices
Little Buck Creek Flow (%) TP (%) TN (%)Runoff
Scenario 2 3 2 3
Scenario 3 5 5 6
Scenario 4 4 4 4
Scenario 5 8 7 8
Scenario 6 7 6 7Baseflow
Scenario 2 0 0 0
Scenario 3 -1 -1 -1
Scenario 4 -1 -1 -1
Scenario 5 -1 -1 -1
Scenario 6 -1 -1 -1Total flow
Scenario 2 1 2 1
Scenario 3 2 4 3
Scenario 4 2 3 2
Scenario 5 4 6 4
Scenario 6 3 5 3
Effectiveness of LID practices LID Scenario Runs: 1991-2010
Summary Simulated runoff, baseflow, and total flow for the
baseline compared well with observed values during calibration and validation periods. Calibration: R2 and NSE > 0.5 Validation: R2 > 0.4; NSE > 0.3
Effectiveness of LID practices at the watershed scale Runoff + pollutants: 2 to 12% Baseflow + pollutants: -1 to -2% Total flow + pollutants: 1 to 9%
Good LID options for retrofitting in urbanized watershed 25% rain barrel/cistern adoption 25% porous pavement adoption 25% rain barrel/cistern + 25% of porous pavement adoption
“Fox River” Project
• Corps 516(e) project is collaboration with Michigan State University Institute of Water Research.
• Tools work together behind the interface.• High-resolution data for 4 Priority
Watersheds.• Medium-resolution data for entire Great
Lakes area.
Extends L-THIA online tool to entire Great Lakes area.
Floating, semi-transparent toolbars, collapsible menus, open architecture for partners, improved editing performance.New Area of Interest tool : Polygon
“Select by HUC” to use a single HUC 12, 10, 8 outline.
Tool will now allow use of a polygon as an area of analysis.
This will improve ability to model zoning and LID BMP areas.
-Display of HIT target layers-EPA Waters layers-GIS layers-Multi-resolution data layers
New Results Options