Watershed Modeling System - Aquaveowmsdocs.aquaveo.com/maricopatutor80.pdf · 1.2 Delineating the...

Watershed Modeling System

WMS v8.0

MARICOPA COUNTY TUTORIALS

TABLE OF CONTENTS

1 MARICOPA COUNTY: NFF AND HEC-1 .......................................................................................... 1-1

1.1 OBJECTIVES ....................................................................................................................................... 1-1 1.2 DELINEATING THE WATERSHED......................................................................................................... 1-1 1.3 BUILDING THE NFF SIMULATION ....................................................................................................... 1-5 1.4 BUILDING THE HEC-1 SIMULATION ................................................................................................... 1-8 1.5 SAVE AND RUN THE HEC-1 SIMULATION ........................................................................................ 1-14

2 MARICOPA COUNTY: MASTER PLAN – CREATING A PREDICTIVE HEC-1 MODEL........ 2-1

2.1 OBJECTIVES ....................................................................................................................................... 2-1 2.2 DEFINING THE WATERSHED ............................................................................................................... 2-1 2.3 BUILDING THE HEC-1 MODEL ........................................................................................................... 2-6 2.4 RUN HEC-1 FOR EXISTING CONDITIONS .......................................................................................... 2-11 2.5 RUN HEC-1 FOR THE PROPOSED CONDITIONS ................................................................................. 2-11

1 Maricopa County: NFF and HEC-1

CHAPTER 1

Maricopa County: NFF and HEC-1

1.1 Objectives

In this exercise, you will learn how to use WMS to set up and run HEC-1 and

National Flood Frequency (NFF) simulations. The WMS customizations for

drainage studies in Maricopa County will be highlighted. By following these

exercises, you will learn how to:

1. Delineate a watershed using DEM data

2. Build a Maricopa County NFF simulation

3. Run NFF and view the results in WMS

4. Build a Maricopa County HEC-1 simulation

5. Run HEC-1 and view the results in WMS

1.2 Delineating the Watershed

Before building a hydrologic model such as HEC-1, we need to define the

watershed boundaries and calculate required parameters (such as basin area,

surface slope, etc). This is done by importing a DEM and using the automatic

basin delineation tools in WMS.

1. Close all instances of WMS

1-2 WMS Maricopa County Tutorials

2. Open WMS

3. Select File | Open

4. Locate the folder C:\WMS80\tutorial\Maricopa\tut1

5. Open “elevations.asc”

6. Select OK to import the DEM

7. The DEM contours will be generated and displayed. In order to

delineate watershed basins, we need to compute flow directions and

flow accumulations for each DEM cell.

1.2.1 Using TOPAZ

1. Switch to the Drainage module

2. Select DEM | Compute TOPAZ Flow Data

3. Change the input/output location if desired by clicking the browse

button

4. Select OK

5. Select the Current Coordinates button

6. Change both Horizontal and Vertical units to U.S. Survey Feet

7. Select OK

8. Select OK

9. Select Close once TOPAZ finishes running (you may have to wait a

few seconds to a minute or so)

Flow directions and accumulations are now automatically read into WMS.

The blue lines that appear on the screen represent anticipated stream locations.

10. Select Display | Display Options

11. Choose DEM Data and set the Min Accumulation for Display to 0.09

12. Select OK

Maricopa County: NFF and HEC-1 1-3

1.2.2 Defining the Basins

The first step in defining basins and sub basins is to place outlet points at the

desired locations along the stream(s). Then, WMS will create stream arcs

based on the outlet locations. Finally, basin boundaries are delineated based

on the stream network and areas contributing to these streams.

1. Switch to the GIS module

2. Select Data | Add Shapefile Data

3. Open “basins.shp”. This shapefile will act as a background image and

help us to place the outlets.

4. Switch to the Drainage module

To aid us in placing the outlet points, we will zoom in on a portion of the

DEM. Then we will import a shapefile containing all of the watershed basins

in Maricopa County:

5. Select the Zoom tool and draw a box around the area indicated by

the rectangle in Figure 1-1

Figure 1-1: Zoom in on the area in rectangle.

In order to make the screen less busy, we will hide the DEM contours. This

will make it easier for us to place the outlets:


6. Select Display | Display Options

7. Choose DEM Data and toggle off the DEM Contours toggle box

8. Select OK

9. Select the Create Outlet Point tool

10. Create a point in each of the two locations shown in Figure 1-2. Be

sure to place each point directly on a stream (zoom in if you need to).

Figure 1-2: Approximate locations for placing the two outlets

11. Select DEM | DEM -> Stream Arcs

12. Select OK to accept the default threshold value. This value is the

minimum accumulation (in units of area) for creating stream arcs. In

other words, for a DEM cell to be considered a stream cell, the

upstream area contributing to that cell must be greater than or equal to

the threshold value.

13. Select DEM | Define Basins


14. At this point you should see the creation of colored basin boundaries.

If you see only one or no basins delineated, go back and verify that

both outlet points are located directly on a stream cell (use the Zoom

tool) and repeat the steps again.

15. Select DEM | Basins -> Polygons

16. Select DEM | Compute Basin Data

17. Select OK

You have now delineated a watershed with two sub basins (corresponding to

two outlets) and computed basin parameters to be used in a hydrologic model.

You’ll notice that in some areas, the DEM generated basin boundaries diverge

from those of the shapefile. Such variations might be attributed to different

dates of production for the DEM and shapefile, and/or limitations of gridded

elevation data.

1.3 Building the NFF Simulation

WMS includes an interface to the National Flood Frequency Program (NFF).

The NFF program is a compilation of all the current statewide and

metropolitan area regression equations, including equations specific to

Maricopa County, AZ.

We will be using the watershed developed in the previous section to run the

NFF model. If you haven’t already done so, copy the files “evaporationgrid”

and “MeanAnnualRainAsciiGrid” to the same directory as your WMS

executable.

To begin, we will import a shapefile containing the NFF Regions of Arizona

and map the regions to feature objects. These region polygons will be used by

WMS to automatically set up the needed Regression Equations used by NFF.

1.3.1 Creating the NFF Regions Coverage

Before adding another coverage, we will hide the basins.shp file to make the

screen less cluttered:

1. Toggle off the check box next to basins.shp

2. Switch to the Map module

3. Create a new coverage by right-clicking on the Coverages folder in the

Project Explorer and selecting New Coverage

4. Change the Coverage Type to NFF Region


5. Select OK


7. Open “arizusgs.shp”


9. Select Mapping | Shapes -> Feature Objects

10. Select Yes

11. Select Next >

12. Notice that the STATE and NFF_REGION fields are automatically

mapped to the correct attributes

13. Select Next >

14. Select Finish


16. Choose the Select Feature Polygon tool

17. Double-click on the polygon in the center, as shown in Figure 1-3, to

verify that the State is Arizona and the Region is Central Arizona

Region 12


Figure 1-3: Double-click on the highlighted polygon to view its attributes

18. Select OK

You have now created the NFF Regions coverage and can proceed to run the

NFF computations.

1.3.2 Running NFF and Viewing Results

1. Select the Zoom tool and zoom in on the two sub basins, which

currently appear as small gray circles, until they are distinguishable

2. Switch to the Hydrologic Modeling module

3. Change the Model list box (at the mid-top of the window) to NFF

4. Choose the Select Basins tool

5. Double-click the basin icon on the left, labeled 2B

6. Select Yes when asked if you want WMS to compute region areas,

annual rainfall, and evaporation

7. Choose the Compute Results button

WMS displays the peak flows for the various return periods in the window at

the bottom of the dialog.


8. Select Done

9. Double-click the basin icon on the right, labeled 1B

10. Select Yes

11. Choose the Compute Results button

12. In the output window at the bottom, click on the line for Recurrence

[years] = 50

13. Choose the Compute Hydrograph button

14. Choose the Compute Lag Time – Basin Data button

15. Change the method to Tulsa 100% Urban Method

16. Select OK twice

17. Select Done to exit the NFF dialog

18. Double-click on the hydrograph icon

You have now computed peak discharge values for both basins and learned

how to generate a hydrograph for any of the design storms using the NFF

interface of WMS

19. Close the hydrograph plot window

1.4 Building the HEC-1 Simulation

Now, we will proceed to set up the HEC-1 / Maricopa County parameters.

Before we can run HEC-1, we need to define several required parameters, plus

any optional parameters that we desire. We will define the following

parameters in this portion of the exercise:

• Precipitation

• Losses

• Unit Hydrograph Method

• Routing (optional)


1.4.1 Precipitation Data

To input the Maricopa County precipitation data, we use the HEC-1 Job

Control dialog:

1. Make sure the Models drop-down field at the top of the interface is set

to HEC-1

2. Select HEC-1 | Job Control

3. Choose the Initialize Maricopa County Precipitation Data button

4. Choose the Basin Average option and select 24-hour (storm duration)

from the drop-down list

5. Click on the Browse button to select a rainfall grid to read in and

use to compute precipitation

6. Open the file named “noaa10y24h”. This is a NOAA rainfall grid

corresponding to a 10 year, 24-hour storm

7. Select OK to accept the default Rainfall computational cell size.

Because the rainfall grid is approximately a 1 km grid size, no

additional accuracy is achieved if the computational cell size is smaller

than the default.

8. Select OK to close both dialogs

The computed precipitation (centroid) is copied to the Basin Average

parameter of HEC-1

1.4.2 Computing Losses

Along with land use and soil type data, WMS can compute Loss Data based on

the Maricopa County methodology. We will first import land use and soil type

shapefiles and convert them to feature objects. Then, using a land use soil

type look-up tables, we will compute the required Loss parameters.

1.4.2.1 Adding Land Use Data

1. Right-click on the Coverages folder in the Project Explorer

2. Select New Coverage from the pop-up menu

3. Change the Coverage Type to Land Use

4. Select OK




7. Open “landusewhitetanks.shp”

8. Hide the NFF Region coverage by un-checking its box in the Project

Explorer

9. Click the Frame macro in order to view the extents of the land use

coverage.

10. Hide arizusgs.shp by un-checking its box in the Project Explorer, if

you have not already done so

If there are multiple shapefiles present in the Project Explorer of the GIS

Module, then it is important to hide any and all shapefiles that you do not wish

to map to feature objects. Since only visible shapefiles can be selected with the

Select Shapes tool, you can hide all shapefiles but the one you are interested

in, and then select the shapes you want to map to feature objects. Note,

however, that if you do not use the Select Shapes tool to select the shapes that

you want to map, then WMS will map all of the shapes from all of the

shapefiles in memory, visible and hidden.

11. Select the Select Shapes tool

12. Draw a selection box around the two sub-basins, thereby selecting the

land use polygons that cover your watershed


14. Select Next

15. Find the column labeled LDUSE_LID and set its Mapping to Land use

16. Select Next

17. Select Finish


19. Make sure the Land Use coverage is still the active coverage


21. Select Feature Objects | Attributes

22. Under the Import land use attribute file section, choose Green-Ampt

Parameter file

23. Click the Import file button


24. Select OK to accept the warning message

25. Open “landusemagtable.tbl”

26. Toggle off the Display SCS CN’s check box and toggle on the Display

Green-Ampt Parameters box

27. Select Apply

1.4.2.2 Adding Soil Type Data

1. Right-click on the Coverages folder in the Project Explorer and select

New Coverage

2. Change the Coverage type to Soil Type

3. Select OK



6. Open “soilwhitetanks.shp”

7. Hide landusewhitetanks.shp by un-checking its box in the Project

Explorer

If there are multiple shapefiles present in the Project Explorer of the GIS

Module, then it is important to hide any and all shapefiles that you do not wish

to map to feature objects. Since only visible shapefiles can be selected with the

Select Shapes tool, you can hide all shapefiles but the one you are interested

in, and then select the shapes you want to map to feature objects. Note,

however, that if you do not use the Select Shapes tool to select the shapes that

you want to map, then WMS will map all of the shapes from all of the

shapefiles in memory, visible and hidden.

8. Select the Select Shapes tool

9. Draw a selection box containing the two sub basins


11. Select Next

12. Find the column labeled SLTYP_LID and change its Mapping field to

SCS soil type

13. Select Next


14. Select Finish

15. Click anywhere outside of the soil type shapefile’s boundaries to clear

the selected polygons



18. Double-click inside one of the soil polygons

19. Change the Import file type list box to Green-Ampt Parameter file

20. Click the Import file button

21. Select OK to accept the warning dialog

22. Open “soiltable.tbl”

23. Turn off the Display of SCS soil type box, and turn on the Display

Green-Ampt parameters box

24. Select Apply

1.4.2.3 Computing Losses

With the land use and soil type coverages defined, we are ready to compute

Losses. To do this:


2. Select Calculators | Compute GIS Attributes

3. Change the Computation list box to Green-Ampt parameters

4. Make sure that you have read in both the Land use mapping and Soil

type mapping tables. Choose the Land use mapping and Soil type

mapping options to verify this, and click the Import button to load

them if you have not done so already.

5. Select OK

Based on the land use and soil type data, WMS now computes all the HEC-1

Loss parameters. We will now verify that the values were copied to HEC-1:

6. Double-click on either of the basin icons (brown box)

7. Click on the Precipitation button to verify that the rainfall has been

properly mapped


8. Select OK

9. Click the Loss Method button and view the Green-Ampt values

computed from the land use and soil coverages.

10. Select OK

11. Select Done

1.4.3 Setting the Unit Hydrograph Method

For this HEC-1 model, we will use the Clark Method to develop the Unit

Hydrograph for both sub basins. To calculate these parameters:

1. Double-click on the basin icon (brown square) for the basin on the left

2. Click the Unit Hydrograph Method button

3. Choose the Clark (UC) option

4. Click the Compute Tc and R – Maricopa County button

5. Set the Resistance coefficient roughness type to B-Moderately Low

Roughness

6. Click the Compute Tc and R button

7. Select OK

8. Select OK again to return to the Edit HEC-1 Parameters dialog

9. Click the Next Hydrograph Station -> button twice to select the sub

basin on the right


11. Choose the Clark (UC) option

12. Click the Compute Tc and R – Maricopa County button

13. Select OK to the message stating that the slope is greater than allowed,

and will be reset to 313 ft/mile

14. Change the Resistance coefficient roughness type to C-Moderately

High Roughness

15. Click the Compute Tc and R button

16. Select OK


17. Select OK

1.4.4 Specifying the Routing Method

To simulate routing from the upstream basin (on the left) to the downstream

basin, we will use the Muskingum routing method.

1. While still in the Edit HEC-1 Parameters dialog, click the <- Previous

Hydrograph Station button to select Outlet 4C

2. Click the Routing Data button

3. Choose the Muskingum (RM) option

4. Click the Compute NSTPS button

5. Choose the From Channel Velocity Estimate option

6. Enter 4 for the velocity estimate

7. Select OK two times to return to the main HEC-1 dialog

8. Select Done to close the HEC-1 dialog

1.5 Save and Run the HEC-1 Simulation

1. Select HEC-1 | Run Simulation

2. Click the browse button next to the Input File

3. For the file name enter “Maricopa” and click Save (this specifies the

file name but does not actually save it)

4. Verify that the Save file before run is toggled on

5. Select OK

6. Select Close when the HEC-1 simulation finishes

Now that HEC-1 computed basin and outlet hydrographs, we can view the

hydrographs with the visualization tools in WMS. To view the computed

hydrographs:

7. Click on any of the hydrograph icons

8. Select Display | Open Hydrograph Plot. Alternatively, you can

double-click on a hydrograph icon to view the hydrograph plot.

2 Maricopa County: Master Plan – Creating a Predictive HEC-1 Model

CHAPTER 2

Maricopa County: Master Plan – Creating a Predictive HEC-1 Model

2.1 Objectives

This exercise illustrates the use of a watershed model to predict possible

hydrologic reactions based on planned land use developments. The following

sections will show you how to use WMS to:

1. Define the watershed of interest

2. Build a Maricopa County HEC-1 simulation

3. Run HEC-1 based on existing land use and soil conditions

4. Run HEC-1 based on proposed conditions

2.2 Defining the Watershed

To create the basins to be used in our HEC-1 simulations, we will use a

shapefile containing pre-delineated sub basins for the Maricopa County. Also,

we will manually create drainage outlets and feature stream arcs for the basins

of interest. Finally, we will use WMS to compute the hydrologic parameters

for our watershed basins.


2.2.1 Converting the Shapefile to Feature Polygons

1. Close all instances of WMS

2. Open WMS



5. Locate the folder C:\WMS80\tutorial\Maricopa\tut2

6. Open “basins.shp”


8. Open “zoom_here.wpr”. This file identifies the basins used in this

exercise.

9. Select the Zoom tool

10. Drag a box approximately around the rectangle shown in Figure 2-1

Figure 2-1: Zoom in on the area bounded by the rectangle

Maricopa County: Master Plan – Creating a Predictive HEC-1 Model 2-3

We will select two basins before converting the shapefile to feature polygons

(when mapping shapefile data to feature objects, only the selected shapes are

converted).

11. Choose the Select Shapes tool

12. Multi-select the two polygons shown in Figure 2-2 by holding the

SHIFT key while selecting each polygon

Figure 2-2: Select the two polygons highlighted in yellow


14. Select Next

15. Select Next

16. Select Finish

The feature polygons have now been created and we are ready to create the

stream arcs. Before continuing, we will remove the basins shapefile from the

Project Explorer:

17. Right-click “basins.shp” in the Project Explorer and select Delete

2.2.2 Getting a Background Image Using the TerraServer

To aid us in drawing the stream arcs, we will import a background map

depicting some of the geographic features within the watershed.



2. Open “maricopa.jpg”


4. Select the Create Feature Arc tool

5. Select Feature Objects | Attributes

6. Change the Arc type to Stream

7. Select OK

8. Using Figure 2-3 as a guide, begin drawing an arc from the location

labeled “Start Here.” Click along the outline of the stream shown on

the topo map so that the arc represents the stream’s geometry. Double-

click at the location labeled “End Here” to end the arc.

Figure 2-3: Guide for creating the first stream arc. Double-click to end the arc

9. Draw a second stream arc as indicated in Figure 2-4


Figure 2-4: Location of the second stream arc

Having created the stream arcs, we will define their shared node as an Outlet

point:

10. Select the Select Feature Point tool

11. Double-click on the node labeled “Start Here” in Figure 2-4

12. Change the Point type to Drainage outlet

13. Select OK

2.2.3 Compute the Basin Data

You have completed the watershed construction and are ready to compute the

basin parameters that will be used by HEC-1

1. Select Feature Objects | Compute Basin Data

2. Click the Current Coordinates button

3. Change both the Horizontal and Vertical Units to U.S. Survey Feet

4. Select OK

5. Verify that the Parameter Units are Square miles for Basin Areas and

Feet for Distances


6. Select OK

2.3 Building the HEC-1 Model

Having computed parameters such as basin area, slope, and length, we will

proceed to set up a HEC-1 simulation.

2.3.1 Initialize Rainfall Data


2. Select HEC-1 from the model drop-down box

3. Select HEC-1 | Job Control

4. Click the Initialize Maricopa County Precipitation Data button

5. Choose the Basin Average method and change the duration to 6 hour

6. Click on the Browse button to select a rainfall grid to read in and

use to compute precipitation

7. Open “noaa50y6h”

8. Select OK to close the Compute Rainfall dialog

9. Select OK twice more to return to the WMS window

2.3.2 Define Unit Hydrograph Method

1. Double-click on the left basin icon


3. Click the Compute Parameters-Basin Data button

4. Set the Computation type to Compute Lag Time

5. Select Tulsa Rural Method from the Method drop-down box

6. Highlight the line containing S Maximum flow distance slope from the

Variable list by clicking on it

7. Enter 2000 in the Variable value field

8. Highlight the line containing the variable S once again to update its

value


9. Select OK

10. Choose the Given unit hydrograph (UI) option

11. Select the Maricopa County S-Graph button

12. Choose Phoenix Valley as the S-Graph type and select OK

13. Select OK to exit the XY Series Editor

14. Select OK to exit the Unit Hydrograph Method dialog

15. Click the Next Hydrograph Station -> button twice to edit the basin on

the right

16. Repeat steps 2 thru 14 above to define the unit hydrograph for this

basin. In this case, however, enter 2400 for the variable S Max flow

distance slope.

2.3.3 Define Routing Method

1. Click the <- Previous Hydrograph Station button to select the outlet

located between the two basins

2. Click the Routing Data button

3. Choose the Muskingum (RM) option

4. Click the Compute NSTPS button

5. Choose the From Channel Velocity Estimate option

6. Enter 6 for the velocity estimate and select OK

7. Select OK to exit the HEC-1 Routing Data dialog

8. Select Done to exit the Edit HEC-1 Parameters dialog

2.3.4 Import the Soil Type and Land Use Coverages

The last parameter we need to define before running HEC-1 is the Green-Ampt

losses. To have WMS compute losses, we will create one soil-type coverage

and three land-use coverages (one representing existing land-use conditions

and two representing future land-use scenarios).


2. Choose the Select Drawing Objects tool at the bottom of screen


3. Select the rectangle surrounding our two basins and press DELETE

4. Right-click on the Coverages folder in the Project Explorer and select

New Coverage

5. Change the Coverage type to Soil Type (notice that the coverage name

is automatically changed to “Soil Type”)

6. Select OK

7. Create another new coverage and change its type to Land Use

8. Set the coverage name as “LU existing”

9. Select OK

10. Create two more Land Use type coverages and name them “LU future

1” and “LU future 2”, respectively

11. Select the LU existing coverage in the Project Explorer to activate it



14. Open “ExistingCondition.shp”


16. Select Yes when asked if you want to use all shapes

17. Select Next

18. Find the column labeled LDUSE_LID and change its Mapping field to

Land use

19. Select Next

20. Select Finish

21. Select LU future 1 in the Project Explorer to activate it

22. Hide ExistingCondition.shp by un-checking its box in the Project

Explorer




25. Open “LU_future1.shp”


27. Draw a selection box around the two basins (the extents of the

watershed area)

By drawing a selection box around the extents of our watershed area, we select

all land use polygons that overlap our watershed.


29. Select Next

30. Notice that in this case, the LU_CODE field was automatically

mapped to the Land use attribute

31. Select Next

32. Select Finish

33. Activate the LU future 2 coverage in the Project Explorer

34. Hide LU_future1.shp by un-checking its box in the Project Explorer



37. Open “LU_future2.shp”



watershed area)


41. Consecutively select Next, Next, and Finish

42. Activate the Soil Type coverage in the Project Explorer

43. Hide LU_future2.shp by un-checking its box in the Project Explorer



46. Open “soilwhitetanks.shp”




watershed area)


50. Select Next

51. Find the column labeled SLTYP_LID and change its Mapping field to

SCS soil type

52. Select Next

53. Select Finish

54. Hide soilwhitetanks.shp by un-checking its box in the Project Explorer

2.3.5 Computing Losses



3. Change the Computation field to Green-Ampt parameters

4. Select the Land use mapping option at the bottom

5. Click the Import button

6. Open “landusemagtable.tbl”

7. Select the Soil type mapping option

8. Click the Import button

9. Select OK if you receive a warning that any previous tables will be

replaced

10. Open “soiltable.tbl”

11. Set the land use coverage name field to LU Existing

12. Select OK

We have computed the losses for the existing land use conditions. Later, when

we want to compute runoff values for the future scenarios, we will simply re-

compute losses in the Compute GIS Attributes calculator.


2.4 Run HEC-1 for Existing Conditions



3. For the file name enter “Mp_existing” and click Save (this specifies

the file name but does not actually save it)


5. Select OK


7. Double-click on the most downstream hydrograph icon (farthest to the

right)

8. The hydrograph shows that for the existing land use conditions, the

peak runoff for a 50 year, 6 hour storm is approximately 1260 cfs.


2.5 Run HEC-1 for the Proposed Conditions


2. Change the land use coverage name to “LU future 1”

3. Change the Computation field to Green-Ampt parameters

4. Select OK



7. For the file name enter “MP_future1” and click Save (this specifies the



9. Select OK to run HEC-1


11. Double-click on the most downstream hydrograph icon


12. In the upper left-hand corner of the Plot Window, note that the peak

runoff has increased to 1440 cfs. This new hydrograph is

superimposed over the previous one. We can zoom in on a portion of

the hydrographs and/or maximize the Plot Window to enlarge the

graph(s).

13. Drag a box around the peaks of the hydrographs

14. Right-click anywhere within the Plot window and select Maximize

Plot

15. Press the ESC key to return the Plot window to its original size

16. To view the entire hydrographs once more, right-click anywhere

within the Plot Window and select Frame Plot

17. Close the plot window


19. Change the land use coverage name to “LU future 2”

20. Select OK



23. For the file name enter “MP_future2” and click Save (this specifies the



25. Select OK to run HEC-1


27. Double-click on the most downstream hydrograph icon

28. Notice that the peak runoff for LU future 2 (1460cfs) is slightly higher

than for LU future 1. The results we are viewing in the plot window

can be exported as tabular data.

29. Right-click within the Plot window and select Export/Print

30. Change the Export type to Text / Data Only

31. Change the Export destination to File


32. Click the Browse button

33. Specify a path and filename

34. Click the Export button

35. Leave the options at the default settings and click the Export button

The exported data can now be opened in a spreadsheet editor for further

manipulation. Another effective way to view HEC-1 results is to browse the

HEC-1 output file (*.out), which can be viewed with any text editor. Also, if

HEC-1 had not terminated successfully, then checking the (*.out) file might

reveal possible errors and/or warnings.

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