Bernie Engel Larry Theller Youn Shik Park Purdue University GLRI Project Corps of Engineers 516(e) Program. May 17-18, 2011

Transcription

1 Bernie Engel Larry Theller Youn Shik Park Purdue University y GLRI Project Corps of Engineers 516(e) Program. May 17-18, 2011

2 Collaboration with LID Hydrologic Analysis - CN Institute of Water Resources, Michigan State Better interoperability Better Editing of Scenario Expose CN and EMC Desktop L-THIA Add LDC/ water quality data access New tool to model BMP effects

3 L-THIA Model Long-Term Hydrologic Impact Assessment Average annual runoff NPS pollution An overview / screening model User friendly tool Does not require detailed data input Identifies need for more detailed modeling Provides "What-If" alternatives evaluation Provides What If alternatives evaluation scenarios

4 L-THIA Model Data requirements and components for analysis in L-THIA Land use Soils Location Curve Number values Daily precipitation Runoff depths EMC NPS pollutants t Runoff volumes User supplied information Performed by L-THIA

5 Low-Impact Development (LID) An approach to land development to mimic the pre-development site hydrology to: 1) Reduce volume of runoff 2) Decentralize runoff, diffusing flows into smaller retention/detention areas 3) Improve water quality 4) Encourage groundwater infiltration

6 Map or HUC Delineate area of Interest Digital Watershed LDC & LOADEST Calculate Estimated Load EDIT L-THIA Scenario S i Set Goals Run L-THIA Model BMP change against L-THIA outputs Under Construction

7 Maumee Watershed L-THIA Model -allows before/after f scenario; Displays HIT layers and others Purdue University is an Equal Opportunity/Equal Access institution.

8 Maumee Watershed L-THIA Model Purdue University is an Equal Opportunity/Equal Access institution. Tabulates HIT layers and others for flowshed of interest.

9 Lot-level screening Impervious area sliders Purdue University is an Equal Opportunity/Equal Access institution.

10 The new version will populate the L- p p THIA LID spreadsheet from the map. Previously this was manual.

11 LID Development Partners EPA, Region 5, Water Division. EPA - Great Lakes Restoration Initiative Program. Illinois-Indiana Indiana Sea Grant, College Program Research & Outreach Development and Capacity Building Projects. K J Li A i t P f R i l Kyoung Jae Lim, Associate Professor, Regional Infrastructure Engineering, Kangwon National University, South Korea.

12 Proposed LID Framework Four steps: Representation of LID practices Use of recommended CN values (Sample, 2001) for bioretention/rain garden, grass swale, open wooded space, porous pavement, permeable patio, rain barrel/cistern, green roof. Considerations of design guidelines Sizing of LID practice using Cs-factor Computation of effective runoff Distributed CN approach: Division of watershed into subwatersheds and computation of runoff volumes for each subwatershed. Computation of LID Effectiveness Index (EI LID ) Quantification of the impacts of LID practices on runoff and water quality

13 L-THIA LID Basic Tool Application: Target preliminary goals at the watershed and site level Reduce imperviousness Conserve infiltratable soils Conserve functional / sensitive landscape Minimize land disturbances Anticipate need for other LID practices to reduce NPS and stormwater volume

14 Enhanced features in L-THIA-LID Forty (40) land uses. TR-55 CN values. Modified values for runoff CN to characterize hydrologic and water quality impacts of LID practices (Sample et al., 2001). Distributed ib t CN approach for runoff computation. ti Computation of 95 th percentile rainfall event and associated runoff. Estimation of baseflow from direct runoff using reverse digital filter method. Computation of daily concentrations of pollutants in runoff (TSS, TP, TN, Pb, Cu, Zn, E-coli

15 Baseflow estimation in the improved L-THIA-LID LID Model Baseflow occurs at a threshold Determination of threshold by delineating the tip of 1500 headwater streams in Indiana using 2008 NHD flow lines Average of areas contributing water to headwater streams is the threshold. Threshold is 82 acres or 0.33 km 2

16 Map or HUC Delineate area of Interest LDC & LOADEST Calculate Estimated Load EDIT L-THIA Scenario S i Set Goals Run L-THIA Model BMP change against L-THIA outputs Under Construction

17 Load Duration Tool with LOADEST

18 a b c d 1. Select State (a). (Indiana and Wisconsin are available, so far.) 2. Three ways to find USGS gauging station : Type address or ZIP (b), Through Google Maps interface (c), Type Station Number (d).

19 Station was found by address, FOX RIVER AT BERLIN, WI Click this button to derive Flow and Water Quality data.

20 a The tool gives.... Information of pre- selected 24 WQ data (a),.. Information on Flow data (b),.. Raw data file of flow and WQ data (c). b Select period to develop LDC (d), and click this button. (period : Jan/1/2008 Nov/8/2010, WQ : 00530) c d

21 a b A simple module works to combine flow and WQ data. Set Water Quality Standard (a). Also combined data file is downloadable to use in other models (b).

22 FDC a LDC b Time Series Plot LOADEST can be run with background mode on this page (a). It provides Mean Daily Load estimated by USGS data (b). Concentration Plot

23 Changed by LOADEST result During processing, the figures on the page will be replaced by LOADEST results. LOADEST Inputs and Outputs are downloadable (a). a

24 Changed by LOADEST result During processing, the figures will be replaced by LOADEST result. Estimated Annual Load File is downloadable (a). Mean Daily Load by LOADEST result will be displayed (b). a b

25 LOADEST results, Estimated Mean Daily Load compared to Mean Daily Load from observed data. Purdue University is an Equal Opportunity/Equal Access institution.

26 Map or HUC Delineate area of Interest LDC & LOADEST Calculate Estimated Load EDIT L-THIA Scenario S i Set Goals Run L-THIA Model BMP change against L-THIA outputs Under Construction

27 Targeting g Tool Take user beyond tables and graphs Allow user to try reduction in CN or EMC Allows a zoning approach (CN) or a BMP approach (EMC)

28 The new step beyond L-THIA is a tool to determine how much landuse change is needed to reduce pollutant to a goal, or how much EMC or runoff must drop to meet that goal.

29 The tool requires.. area of the combination of landuse and soil group,.. daily precipitation data,.. objectives (chemistry) to reduce,.. reduction goal. The goal of this tool is to determine how much landuse change or EMC reduction is needed to reduce pollutant to a goal.

30 Client Side 1. Input area of each HRU 2. Changeable CN and EMC manually 3. Upload daily precipitation data 4. Set objective to reduce 5. Set the goal Server Side Modify CN or EMC, If requested 1. Suggested area to meet the goal (table table) ) 2. Comparison of Scenarios (graph) 3. Downloadable daily and annual file Define optimum area to meet the goal by Genetic-Algorithm Objectives: Runoff, Total Suspended Solids, Total Phosphorus, Total Nitrogen, Lead, Copper, Zinc, E-coli.

31 The tool provides.. How much area needs to change to meet the goal,.. annual estimated NPS load values for current and changed,.. annual and daily as output file.

32 For more information and a list of tools: L-THIA L-THIA LID Web-GIS tools (Online L-THIA) for Spatial Hydrologic Analysis Questions?