https://engineering.purdue.edu/~ldc

WEB-BASED LOAD DURATION CURVE

Indrajeet ChaubeyPurdue University

Presented at the EPA Region 5 TMDL Practitioners WorkshopApril 20, 2008

https://engineering.purdue.edu/~ldc

Collaborators• Christine Urban – EPA Region 5

• Bernard Engel, James Hunter, Joseph Quansah, Larry Theller – Purdue University

• K.J. Lim – Kangwon National University

• Stacy Goodwin – IDEM

• Thomas Over - USGS

https://engineering.purdue.edu/~ldc

Flow Duration Curve (FDC)

Flow Duration Curve (Adapted from USEPA, 2007)

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Flow Duration Curve (FDC)

Use: Flow patterns variability assessment in historic flow data

Flow Data Source: USGS, modeling, etc.

Analyzing FDC: Hydrologic condition indicator divisions for

FDC depends on the local hydrology and the water quality

issues:

• EPA (2007) recommends five hydrologic zones/categories –

High flows (0-10%)

Moist conditions (10-40%)

Mid-range flows (40-60%)

Dry conditions (60-90%)

Low flows (90-100%)

https://engineering.purdue.edu/~ldc

Load Duration Curve (LDC)

Use: To understand water quality concentration and load

variability for developing TMDLs

Water Quality Data: Federal, State and Educational

institutions, watershed practitioners, etc

Water Quality Standard: EPA, Local Stakeholders

LDC Development:

LDC = Stream flow *water quality target *conversion factor

https://engineering.purdue.edu/~ldc

Load Duration Curve (LDC)

Flow Duration Curve (USEPA, 2007)

In compliance

Out of compliance

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Web-Based Flow Duration and Load Duration Curve Tool

https://engineering.purdue.edu/~ldc

1. Enter/Upload Flow Data for FDC

This option lets you enter your own flow data directly on the spreadsheet

This option lets you upload your own flow data from an existing file

https://engineering.purdue.edu/~ldc

1A. Enter Flow Data for FDC

You can type your ownDescription here

Date should be in yyyymmdd format

Flow unit can be either cms or cfs Clicking this

button will create the FDC

https://engineering.purdue.edu/~ldc

Flood Conditions

100 cfs

Flow Duration Curve (2002-2007) for USGS Gauge 04180000, Cedar Creek, IN

1A. Enter Flow Data for FDCFDC – Analysis

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You can download the dataset byClicking on this button

You can click on the graph/image to save it on your computer

1A. Enter Flow Data for FDC

https://engineering.purdue.edu/~ldc

1B. Upload Flow Data for FDC

https://engineering.purdue.edu/~ldc

1B. Upload Flow Data for FDC

You can click on this button to seeExample data format

https://engineering.purdue.edu/~ldc

1B. Upload Flow Data for FDC

You can browse the file containingFlow data and then click on upload

https://engineering.purdue.edu/~ldc

Click this button to Generate FDC

1B. Upload Flow Data for FDC

Flow unit can be either cms or cfs

You can type your ownDescription here

https://engineering.purdue.edu/~ldc

Flood Conditions 100 cfs

Flow Duration Curve (2002-2007) for USGS Gauge 04180000, Cedar Creek, IN

1B. Upload Flow Data for FDCFDC – Analysis

https://engineering.purdue.edu/~ldc

3. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC 3

This option lets you use Google to select a USGS Gauge and directly upload flow data into the tool

This option lets you enter a USGS Gauge number to directly upload flow data into the tool

https://engineering.purdue.edu/~ldc

3A. Retrieve USGS Flow Data and /Upload WQ Data for LDC

You can click here to retrieve USGS flow data

https://engineering.purdue.edu/~ldc

3A. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC 3

Select beginning andEnding dates

Click this button to Generate FDC only

https://engineering.purdue.edu/~ldc

Flood Conditions100 cfs

Flow Duration Curve (2002-2007) for USGS Gauge 04180000, Cedar Creek, IN

3A. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

FDC – Analysis

https://engineering.purdue.edu/~ldc

3B. Retrieve USGS Flow Data and /Upload WQ Data for LDC

You can enter USGS gauge number to retrieve flow data

Select beginning andEnding dates

Click this button to Generate FDC

https://engineering.purdue.edu/~ldc

Flood Conditions

100 cfs

Flow Duration Curve (2002-2007) for USGS Gauge 04180000, Cedar Creek, IN

3B. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

FDC –Analysis

https://engineering.purdue.edu/~ldc

2. Enter / Upload Flow and WQ Data for LDC

This option lets you enter your own flow and WQ data directly on the spreadsheet

This option lets you upload your own flow and WQ data from an existing file

https://engineering.purdue.edu/~ldc

2A. Enter / Upload Flow and WQ Data for LDC

You can type your own description here

Date should be in yyyymmdd format

Flow unit can be either cms or cfs

Clicking this button will create the FDC and LDC

WQ unit can be ppm, ppb or count/100ml

You can type water quality pollutant name here

You can enter WQ standard or criteria value

https://engineering.purdue.edu/~ldc

Flood Conditions

100 cfs

Flow Duration Curve (2002-2007) for USGS Gauge 04180000, Cedar Creek, IN

FDC –Analysis

2. Enter / Upload Flow and WQ Data for LDC

https://engineering.purdue.edu/~ldc

LDC (2002-2007) for Ammonia at USGS Gauge 04180000, Cedar Creek, IN

FDC – Result Analysis2. Enter / Upload Flow and WQ Data for LDC

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WQ Target (0.10 ppm)

Target Concentration Graph for Ammonia at USGS Gauge 04180000, Cedar Creek,

FDC – Result Analysis2. Enter / Upload Flow and WQ Data for LDC

https://engineering.purdue.edu/~ldc

You can download the dataset byClicking on this button

FDC – Result Analysis

2. Enter / Upload Flow and WQ Data for LDC

https://engineering.purdue.edu/~ldc

2B. Enter / Upload Flow and WQ Data for LDC

https://engineering.purdue.edu/~ldc

2B. Enter / Upload Flow and WQ Data for LDC

You can type your own Description here

Date should be in yyyymmdd format

Flow unit can be either cms or cfs

Clicking this button will create the FDC and LDC

WQ unit can be ppm, ppb or count/100ml

You can type water quality pollutant name here

You can enter WQ standard or criteria value

https://engineering.purdue.edu/~ldc

LDC (2002-2007) for Ammonia at USGS Gauge 04180000, Cedar Creek, IN

FDC – Result Analysis2. Enter / Upload Flow and WQ Data for LDC

https://engineering.purdue.edu/~ldc

WQ Target (0.10 ppm)

Target Concentration Graph for Ammonia at USGS Gauge 04180000, Cedar Creek,

FDC – Result Analysis2. Enter / Upload Flow and WQ Data for LDC

https://engineering.purdue.edu/~ldc

3. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

This option lets you use Google to select a USGS Gauge and directly upload flow data into the tool

This option lets you enter a USGS Gauge number to directly upload flow data into the tool

https://engineering.purdue.edu/~ldc

3A. Retrieve USGS Flow Data and /Upload WQ Data for LDC

You can here to retrieve USGS flow data

https://engineering.purdue.edu/~ldc

3A. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

Select beginning andEnding dates

Click this button to Generate LDC

Flow unit can be either cms or cfs

You can type your own Description here

You can enter WQ standard value

WQ unit can be ppm, ppb or count/100ml

You can type water quality pollutant name here

https://engineering.purdue.edu/~ldc

3A. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

Select beginning andEnding dates

Click this button to Generate LDC

https://engineering.purdue.edu/~ldc

Flood Conditions

100 cfs

Flow Duration Curve (2002-2007) for USGS Gauge 04180000, Cedar Creek, IN

FDC –Analysis

3. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

https://engineering.purdue.edu/~ldc

LDC (2002-2007) for Ammonia at USGS Gauge 04180000, Cedar Creek, IN

FDC – Result Analysis

3. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

https://engineering.purdue.edu/~ldc

WQ Target (0.10 ppm)

Target Concentration Graph for Ammonia at USGS Gauge 04180000, Cedar Creek,

FDC – Result Analysis

3. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

https://engineering.purdue.edu/~ldc

You can download the dataset byClicking on this button

FDC – Result Analysis

3. Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

https://engineering.purdue.edu/~ldc

4. Using USGS Flow Data * Drainage Area Ratio and Entered /Uploaded WQ Data for LDC

This option lets you use Google to select a USGS Gauge and directly upload flow data into the tool

This option lets you enter a USGS Gauge number to directly upload flow data into the tool

Enter Watershed Area-Ratio

https://engineering.purdue.edu/~ldc

You can click here to retrieve USGS flow data

4. Using USGS Flow Data * Drainage Area Ratio and Entered /Uploaded WQ Data for LDC

https://engineering.purdue.edu/~ldc

Select beginning andEnding dates

Click this button to Generate LDC

Flow unit can be either cms or cfs

You can type your own Description here

You can enter WQ standard value

WQ unit can be ppm, ppb or count/100ml

You can type water quality pollutant name here

4. Using USGS Flow Data * Drainage Area Ratio and Entered /Uploaded WQ Data for LDC

https://engineering.purdue.edu/~ldc

FDC (2002-2007) for USGS Gauge 04180000, Cedar Creek, INwith Watershed Ratio of 0.75

4. Using USGS Flow Data * Drainage Area Ratio and Entered /Uploaded WQ Data for LDC

https://engineering.purdue.edu/~ldc

LDC for Ammonia at USGS Gauge 04180000, Cedar Creek, INwith Watershed Ratio of 0.75

4. Using USGS Flow Data * Drainage Area Ratio and Entered /Uploaded WQ Data for LDC

https://engineering.purdue.edu/~ldc

4. Using USGS Flow Data * Drainage Area Ratio and Entered /Uploaded WQ Data for LDC

WQ Target (0.10 ppm)

Target Concentration graph for Ammonia at USGS Gauge 04180000, Cedar Creek, IN with Watershed Ratio of 0.75

https://engineering.purdue.edu/~ldc

5. Enter Flow and WQ Data for LDC with Surface-runoff and Estimated Loads

Date should be in yyyymmdd format

Flow unit can be either cms or cfs

WQ unit can be ppm, ppb or count/100ml

You can type your own Description here

Select Aquifer Type

https://engineering.purdue.edu/~ldc

https://engineering.purdue.edu/~ldc

5. Enter Flow and WQ Data for LDC with Surface-runoff and Estimated Loads

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5. Enter Flow and WQ Data for LDC with Surface-runoff and Estimated Loads

https://engineering.purdue.edu/~ldc

• Please visit the link below for most up to date information on FDC and LDC

https://engineering.purdue.edu/~ldc

https://engineering.purdue.edu/~ldc

Please visit the link below for most up to date information on FDC and LDC https://engineering.purdue.edu/~ldc