Civil3D 2010 Skill Builder Storm Sewers

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Analyzing Storm Sewer Data with the Hydraflow Storm Sewers Extension for AutoCAD Civil 3D 2010 This Skill Builder demonstrates how to use the Hydraflow Storm Sewers Extension to analyze a preliminary storm sewer design. You will use standard AutoCAD Civil 3D features to perform a preliminary hydrologic analysis, and then use the Hydraflow Storm Sewers Extension to perform a detailed hydraulic analysis. This Skill Builder covers the following topics: Analyzing an AutoCAD Civil 3D site for storm water management requirements Specifying default settings for migrating data between AutoCAD Civil 3D and the Hydraflow Storm Sewers Extension Setting Hydraflow Storm Sewers Extension design constraints Adding pipes and structures to a network in the Hydraflow Storm Sewers Extension Calculating and entering pipe and structure design data Analyzing and adjusting the proposed pipe network design Incorporating the revised pipe network into the AutoCAD Civil 3D drawing Installing the Skill Builder Files For best results, save the files that are included with this Skill Builder to the following folder, creating the Storm Sewers folder, and the Skill Builders folder if it does not exist. Other Skill Builders for AutoCAD Civil 3D should also go into the Skill Builders folder. Skill Builders\Storm Sewers folder Windows XP: C:\Documents and Settings\[user name]\My Documents\Autodesk\Skill Builders\Storm Sewers Windows Vista: C:\Users\[user name]\Documents\Autodesk\Skill Builders\Storm Sewers Analyzing the Site In this exercise, you will examine the site to review how to use standard AutoCAD Civil 3D features to prepare for the analysis in the Hydraflow Storm Sewers Extension. 1 In the AutoCAD Civil 3D window, click Open. Navigate to the Skill Builders\Storm Sewers folder (page 1). Open Civil3D_2010_skillbuilder_storm_sewers.dwg. The site contained in this drawing consists of the following objects: A proposed ground surface, which was created by combining the existing ground surface, corridor top surface, and grading groups Alignments and profiles for the road centerlines and proposed storm water drainage route 1

Transcript of Civil3D 2010 Skill Builder Storm Sewers

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Analyzing Storm Sewer Data with the Hydraflow Storm SewersExtension for AutoCAD Civil 3D 2010

This Skill Builder demonstrates how to use the Hydraflow Storm Sewers Extension to analyze apreliminary storm sewer design.

You will use standard AutoCAD Civil 3D features to perform a preliminary hydrologic analysis, andthen use the Hydraflow Storm Sewers Extension to perform a detailed hydraulic analysis.

This Skill Builder covers the following topics:

■ Analyzing an AutoCAD Civil 3D site for storm water management requirements

■ Specifying default settings for migrating data between AutoCAD Civil 3D and the HydraflowStorm Sewers Extension

■ Setting Hydraflow Storm Sewers Extension design constraints

■ Adding pipes and structures to a network in the Hydraflow Storm Sewers Extension

■ Calculating and entering pipe and structure design data

■ Analyzing and adjusting the proposed pipe network design

■ Incorporating the revised pipe network into the AutoCAD Civil 3D drawing

Installing the Skill Builder FilesFor best results, save the files that are included with this Skill Builder to the following folder, creatingthe Storm Sewers folder, and the Skill Builders folder if it does not exist. Other Skill Builders forAutoCAD Civil 3D should also go into the Skill Builders folder.

Skill Builders\Storm Sewers folder

Windows XP: C:\Documents and Settings\[user name]\My Documents\Autodesk\Skill Builders\StormSewers

Windows Vista: C:\Users\[user name]\Documents\Autodesk\Skill Builders\Storm Sewers

Analyzing the SiteIn this exercise, you will examine the site to review how to use standard AutoCAD Civil 3D featuresto prepare for the analysis in the Hydraflow Storm Sewers Extension.

1 In the AutoCAD Civil 3D window, click ➤ Open. Navigate to the Skill Builders\StormSewers folder (page 1). Open Civil3D_2010_skillbuilder_storm_sewers.dwg.

The site contained in this drawing consists of the following objects:

■ A proposed ground surface, which was created by combining the existing ground surface,corridor top surface, and grading groups

■ Alignments and profiles for the road centerlines and proposed storm water drainage route

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■ A series of proposed parcels for a residential subdivision

2 Select the surface. Click Surface tab ➤ Modify panel ➤ Surface Properties drop-down ➤ Surface

Properties .

3 In the Surface Properties dialog box, in the Surface Style list, select Slope Analysis. Click OK.

Zoom in to examine the arrows that are displayed on the surface. The direction of the arrowsillustrates the slope of the surface:

■ The lots in the center of the looped road all slope down toward the road.

■ The roads are crowned, and they slope from the crown toward the gutters.

■ The front half of the lots along the main road and the outside of the looped road slope towardthe road. The back half of those lots slope away from the road.

4 Click Home tab ➤ Layers panel ➤ Layer list. Click to turn on the _WATERDROP layer.

This layer displays water drop paths, which illustrate the path that water drains from the proposedground surface. For this site, water drop paths for the front and back of each lot have been created.

The markers identify the beginning of each water drop path.

NOTE If the markers are not displayed, enter REGEN on the command line.

If you hover over the water drop paths, you will notice that groups of the paths drain to a commonpoint.

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5 Repeat Steps 2 and 3 to change the surface style to Border Only.

6 Click Home tab ➤ Layers panel ➤ Layer list. Click to turn on the _CATCHMENT-AREAS layer.

This layer displays catchment areas, which illustrate the surface area that drains to a given point on asurface. In this project, the areas were created at the common points to which the water drop paths

drain. The markers identify the catchment marker points.

NOTE If the markers are not displayed, enter REGEN on the command line.

Catchment areas can be created either automatically using the AutoCAD Civil 3D catchment areacommand, or manually using either 2D or 3D polylines. The catchment areas in this drawing werecreated using the catchment area command, and then refined using the PEDIT command.

TIP To learn how to use the water drop and catchment area tools, see the Analyzing Surface Water Runoffexercise in the AutoCAD Civil 3D tutorials.

7 Click Home tab ➤ Layers panel ➤ Layer list. Click to turn off the _CATCHMENT-AREAS layer. Click

to turn on the _SUBCATCHMENT-AREAS layer.

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Many of the catchment areas that were created with the catchment area command were larger thandesired. On this layer, polylines were used to subdivide the catchment areas into smaller,subcatchment areas. The area value of each subcatchment area is displayed near the correspondingcatchment point. You will use this value when you analyze the storm sewer network in the HydraflowStorm Sewers Extension.

TIP To get the area value of a closed polyline, use the LIST command. Alternatively, you can use createparcels from the closed polylines and use dynamic area labels.

8 Click Home tab ➤ Layers panel ➤ Layer list. Click to turn off the _WATERDROP layer. Click to turn on the _STORM SEWER NETWORK layer.

NOTE If the markers are still displayed, or the pipes and structures are not displayed, enter REGENon the command line.

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The preliminary storm sewer networks for the main and looped road are displayed on this layer. Thereare catch basins near the approximate catchment points of the subcatchment areas. The outfall of themain road network is at a pond to the north of the road. The looped road network drains at the northwestcorner of the site.

The preliminary storm sewer layout was created using the following considerations. To be successfullyimported into the Hydraflow Storm Sewers Extension, a pipe network must meet these conditions:

■ The pipes should be drawn in the direction of flow.

■ The combined number of inlet structures should equal the total number of pipes. A pipe and itscorresponding inlet structure make up a Hydraflow Storm Sewers line.

■ There cannot be more than 250 lines in a single Hydraflow Storm Sewers project. If a single AutoCADCivil 3D pipe network contains more than 250 lines, then the network must be divided into smallernetworks before it can be imported into the Hydraflow Storm Sewers Extension.

■ All catch basin and junction structures must have an outlet pipe. You can confirm this in the StructureProperties dialog box, on the Connected Pipes tab, in the In/Out column.

Specifying Baseline Design Data in the Hydraflow Storm SewersExtension

In this exercise, you will specify default hydraulic and hydrologic parameters to apply to your design, modifythe design codes, and create an IDF (Intensity, Duration, Frequency) curve using known data.

In the Hydraflow Storm Sewers Extension, default hydraulic parameters to which a storm sewer networkdesign is initially constrained are saved in a design codes file. The specified codes are applied to pipes andstructures either as they are created in the Hydraflow Storm Sewers Extension, or applied after they areimported from AutoCAD Civil 3D. After the network has been designed, you can change the parameters ofeach part from its original constraints.

NOTE Design codes are similar to pipe and structure rules in AutoCAD Civil 3D. Design codes override anypreviously applied AutoCAD Civil 3D pipe and structure rules.

Known hydrologic properties for a site are saved as an intensity, duration, and frequency, or IDF curve. Toset up a custom IDF curve, you enter a given rainfall intensity value for two to three durations at twofrequencies, and then the Hydraflow Storm Sewers Extension calculates the interim values. You can set upan IDF curve for a locale, and then save it as an IDF file for later use.

In the Hydraflow Storm Sewers Extension, there are several ways to set up an IDF curve, including manually,using map data, and using FHA or polynomial calculations. In this skill builder, you will create an IDF curveusing map data of the Eastern United States.

NOTE Two sample IDF files are included with the Hydraflow Storm Sewers Extension in the following folder:

■ Windows XP: C:\Documents and Settings\All Users\Application Data\Autodesk\C3D 2010\enu\HHApps\IDF

■ Windows Vista: C:\ProgramData\Autodesk\C3D 2010\enu\HHApps\IDF

The most recently used IDF curve and design codes are saved with the project and will be automaticallyloaded the next time the Hydraflow Storm Sewers Extension is launched.

Specify hydraulic design constraints

1 Click Analyze tab ➤ Design panel ➤ Launch Storm Sewers .

2 In the Hydraflow Storm Sewers Extension window, on the main toolbar, click .

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3 In the Design Codes dialog box, on the Pipes tab, specify the following parameters:

■ Zero At Outfalls: Selected

■ Default N-Value: 0.013

NOTE The n-value is the friction factor of the part material. The 0.013 value is appropriate for astorm sewer network that is constructed of reinforced concrete. A table of n-values for other typicalmaterials is located in the Hydraflow Storm Sewers Extension help in the Appendix section.

4 Click the Inlets tab.

Examine the parameters that are available on this tab. You can specify a variety of default valuesfor the curb, grate, gutter, and structure.

5 On the Inlets tab, under Defaults, specify the following parameters:

ValueItem

4.00Inlet Length (ft)Curb

4.0Throat Height (in)

HorizOpening (Global)

2.00Clear Area (sqft)Grate

1.50Width (ft)

2.00Length (ft)

0.02Rd. Cross Sl, Sx (ft/ft)Gutter

0.06Cross Sl, Sw (ft/ft)

1.50Width (ft)

0.00Local Depr. (in)

0.013n-Value

NOTE The Road Cross Sl and Width values must matchthe parameters of the corridor at each inlet station. Thesevalues are consistent for all inlets in the design used in thisskill builder, but they often vary.

CirShapeStructure

4.00Length (ft)

4.00Width (ft)

6 Click the Calculations tab.

This tab contains default parameter values for hydraulic grade line (HGL), Flow options, and JunctionLoss Coefficients.

7 Under Flow Options, make sure the Min. Tc Used To Calc Intensity value is 5.

If a Tc value that is less than five is entered, the Hydraflow Storm Sewers Extension will ignore itand use 5 for the calculation.

8 Click OK.

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Specify known hydrologic data

1 In the Hydraflow Storm Sewers Extension window, select I-D-F Curves menu ➤ Create New From MapData ➤ Eastern States.

2 In the Build I-D-F Curves From Hydro-35 Data dialog box, enter the following values:

60-min15-min5-min

1.10.670.352-yr

2.51.40.65100-yr

NOTE These are rainfall values that are specific to the site. To find rainfall data for locales in the United States,visit www.noaa.com.

3 Click OK.

Hydraflow Storm Sewers Extension calculates the rainfall intensity coefficients based on the data youentered in Step 2. The coefficient values are displayed in the Rainfall IDF Curve dialog box on theCoefficients tab. Notice that the tabular data on the Coefficients and IDF Table tabs are fully editable.If you make changes to the data, the graph on the IDF Graph tab updates.

4 In the Rainfall IDF Curve dialog box, click .

5 In the Save As dialog box, navigate to the Skill Builders\Storm Sewers folder (page 1). For File Name,enter Skill _Builder.idf. Click Save.

6 In the Rainfall IDF Curve dialog box, click .

NOTE The last IDF file that is used will automatically be loaded the next time that the Hydraflow StormSewers Extension is launched. When you finish this skill builder, reload your standard IDF file.

Specifying Migration Settings in AutoCAD Civil 3DIn this exercise, you will examine the default settings for migrating data between AutoCAD Civil 3D andthe Hydraflow Storm Sewers Extension.

1 In Toolspace, on the Settings tab, expand the Pipe Network ➤ Commands collection.

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The following three commands are available for migrating data between AutoCAD Civil 3D andthe Hydraflow Storm Sewers Extension:

■ EditInStormSewers

■ ExportStormSewerData

■ ImportStormSewerData

Each of these commands enables you to use the STM file format to exchange pipe network databetween the two applications. All three commands have the same migration default settings. Inthis skill builder, you will update the settings at the feature level, which will ensure that the samedefaults are used during export and import.

2 Right-click Pipe Network. Click Edit Feature Settings.

3 In the Edit Feature Settings dialog box, expand Storm Sewers Migration Defaults.

4 In the Part Matching Defaults row, click the Value cell. Click .

5 In the Part Matchup Settings dialog box, click the Export tab.

The Civil 3D Part Type column lists the structures and pipes that are available in AutoCAD Civil3D. The Storm Sewers Part Type column enables you to specify the part type that is assigned toeach pipe and structure as they are exported to the STM file. The Import tab has a similar structure,although it specifies the AutoCAD Civil 3D part type that will be assigned to each pipe and structureas it is imported into AutoCAD Civil 3D.

Examine the settings on the Part Matchup Settings dialog box, but do not change anything.

6 Click Cancel.

7 In the Edit Feature Settings dialog box, in the Parts List Used For Migration row, click the Value

cell. Click .

8 In the Parts List Used For Migration dialog box, click Edit Current Selection.

In the Network Parts List dialog box, on the Pipes and Structures tabs, examine the styles that areassigned to the parts contained in this parts list. The styles, as well as the other properties, areassigned to the pipe network parts during import and export.

Examine the settings on the Network Parts List dialog box, but do not change anything.

9 Click Cancel three times.

Exporting Preliminary Design Data from AutoCAD Civil 3DIn this exercise, you will export the preliminary pipe network design, and several other site elements,from AutoCAD Civil 3D.

At the end of this exercise, you will have a total of three file formats that can be consumed by theHydraflow Storm Sewers Extension:

■ STM: Use a STM file to migrate hydraulic data between AutoCAD Civil 3D and the Hydraflow StormSewers Extension. You can open an STM file in the Hydraflow Storm Sewers Extension, analyze andmodify the pipe network, and then import it back into AutoCAD Civil 3D.

■ LandXML: Use a LandXML file to use AutoCAD Civil 3D alignment and parcels objects as a referencein the Hydraflow Storm Sewers Extension.

■ DXF: Use a DXF file to use AutoCAD objects, such as lines and polygons, as a reference in theHydraflow Storm Sewers Extension.

Export the preliminary pipe network to an STM file

1 Click Output tab ➤ Export panel ➤ Export To Storm Sewers .

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2 In the Export To Storm Sewers dialog box, select the Main Road Storm Sewer check box, and clear theLoop Road Storm Sewer check box.

For this skill builder, only the Main Road Storm Sewer pipe network is analyzed.

3 Click OK.

4 In the Export Storm Sewers To File dialog box, navigate to the Skill Builders\Storm Sewers folder (page1). For File Name, enter Main_Road_Network_Preliminary.stm. Click Save.

Export the alignments and parcels to a LandXML file

1 Click Output tab ➤ Export panel ➤ Export To LandXML .

2 In the Export to LandXML dialog box, clear all the check boxes, except for the following check boxes:

■ Alignments

■ Sites

You already exported the appropriate pipe network to an STM file. The alignments and parcels areoptional, but you will use them for reference in this skill builder.

3 Click OK.

4 In the Export LandXML dialog box, navigate to the Skill Builders\Storm Sewers folder (page 1). ForFile Name, enter Alignments_And_Parcels.xml. Click Save.

Save the subcatchment areas as DXF

1 click ➤ Save As.

2 In the Save Drawing As dialog box, navigate to the Skill Builders\Storm Sewers folder (page 1).

■ For Files Of Type, select AutoCAD 2010 DXF (*.dxf).

■ For File Name, enter Subcatchment_Areas.dxf.

3 Click Tools ➤ Options.

4 In the Saveas Options dialog box, on the DXF Options tab, select Select Objects. Click OK.

5 In the Save Drawing As dialog box, click Save.

6 In the drawing, select each of the 13 green subcatchment areas along the main road.

NOTE Make sure to select the closed polylines that define the subcatchment areas. Do not select the labels.

7 Press Enter.

Importing Preliminary Design Data into the Hydraflow StormSewers Extension

In this exercise, you will open a preliminary pipe network layout into the Hydraflow Storm Sewers Extension,and then import references to other site elements.

In addition to the preliminary pipe network, you can import other site elements as a background. Siteelements can be imported in either LandXML or DXF.

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Open the storm sewer network in the Hydraflow Storm Sewers Extension

1 In the In the Hydraflow Storm Sewers Extension window, on the main toolbar, click .

2 In the Open Project dialog box, navigate to the Skill Builders\Storm Sewers folder (page 1). SelectMain_Road_Network_Preliminary.stm. Click Open.

The preliminary pipe network layout is displayed.

Import the subcatchment areas from DXF

1 In the Hydraflow Storm Sewers Extension window, on the main toolbar, click . SelectBackground Image From DXF.

2 In the Add DXF Background Image dialog box, navigate to the Skill Builders\Storm Sewers folder(page 1). Select Subcatchment_Areas.dxf. Click Open.

Notice that while the subcatchment areas are displayed, arcs and curves are displayed as linesegments. This is a limitation of the background image from DXF feature.

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Import the alignment and parcels from LandXML

1 In the Hydraflow Storm Sewers Extension window, on the main toolbar, click .

2 In the Import/Export LandXML dialog box, on the Import tab, click Browse.

3 In the Open XML File dialog box, navigate to the Skill Builders\Storm Sewers folder (page 1). SelectMain_Road_Parcels_And_Alignment.xml. Click Open.

4 In the Import/Export LandXML dialog box, click Open. Click OK when you receive confirmation thatthe XML file opened successfully.

5 Under Import Options, select the following check boxes:

■ Parcels As Background

■ Alignments As Background

6 Click Import.

The alignments and parcels are displayed in the Storm Sewers Extension window.

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Notice that while the alignments and parcels are displayed in the background, the subcatchmentareas are no longer displayed. The background image can come from only one source. When a newbackground image is imported, it overwrites the previously imported background image.

Modify the display and save the project

1 Click Options ➤ Plan View ➤ Labels. Make sure that only the following items are selected:

■ Show Line Numbers

■ Show Junction Icons

NOTE The Line IDs and Inlet IDs are the names that are assigned to the individual parts in AutoCADCivil 3D. In this skill builder, we will use the numbers that were automatically assigned to the pipes bythe Storm Sewers Extension.

2 On the main toolbar, click .

NOTE The Updated_Main_Road_Network_For_Analysis.stm file, which was included with this skill builder,contains all the modifications to the network that are made in this skill builder. You can use this file inthe Analyzing the Storm Water Network (page 20) exercise to save time entering data and ensure thatyou get the expected results.

3 When you are notified that the project has been saved, click OK.

Adding Lines to the Storm Sewer NetworkIn this exercise, you will draw two new lines in the storm sewer network.

A line consists of a pipe and an upstream structure. You will add two branch lines that drain into themanhole structure at station 8+05. To ensure that the design is accurate, you will specify the structuretype, line length, and deflection angle.

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Confirm the design codes and IDF curve settings

1 In the Hydraflow Storm Sewers Extension window, on the main toolbar, click .

2 In the Design Codes dialog box, confirm that the settings are those that you specified in SpecifyingBaseline Design Data in the Hydraflow Storm Sewers Extension (page 5).

3 Click OK.

4 On the main toolbar, click .

5 In the Rainfall IDF Curve dialog box, make sure that the right-hand side of the toolbar displays

Skill_Builder.idf. If it does not, click .

6 In the Open dialog box, navigate to the Skill Builders\Storm Sewers folder (page 1). SelectSkill_Builder.idf. Click Open.

7 Click .

8 On the main toolbar, click .

9 When you are notified that the project has been saved, click OK.

Draw a line

1 Click and zoom in to the manhole structure between lines 6 and 7.

2 In the toolbox, click .

This is the grate inlet icon, which is the third structure icon in the toolbox.

NOTE The Hydraflow Storm Sewers Extension toolbox contains tools for adding lines to a network. Thetoolbox is located on either the right or left side of the Hydraflow Storm Sewers Extension window.

3 Move the cross hairs over the junction of lines 6 and 7. Click and then drag the cross hairs up and tothe left as shown in the following image.

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4 In the status bar, specify the following parameters:

■ Ang: -82.8

■ Length (ft): 18.7

■ Dnstrm Line: 6

5 In the toolbox, click .

Draw a second branch line

1 Use the previous procedure to add a second branch line as shown in the following image.

2 Specify the following parameters in the status bar:

■ Ang: 123.2

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■ Length (ft): 7.9

■ Dnstrm Line: 6

3 In the toolbox, click .

Name the new pipes and structures

1 In the plan view, double-click the structure for line 19.

2 In the Add/Edit dialog box, on the Pipe tab, specify the following parameters:

■ Line ID: Main 8+10 (L)

■ Physical ➤ Inlet/Rim Elev Up: 116.45

Click OK.

3 Click to go to Line 18.

4 In the Add/Edit dialog box, on the Pipe tab, specify the following parameters:

■ Line ID: Main 8+00 (R)

■ Inlet/Rim Elev Up: 116.45

5 Click OK.

6 Click the Inlet/Junction tab.

7 On the Inlet/Junction tab, for Inlet ID, enter Main CB 8+00 (R). Click OK.

8 Click to go to Line 19.

9 On the Inlet/Junction tab, for Inlet ID, enter Main CB 8+10 (L). Click OK.

10 Click Exit.

11 On the main toolbar, click .

12 When you are notified that the project has been saved, click OK.

Specifying Pipe Flow DataIn this exercise, you will specify known hydrologic data for each pipe.

You can enter flow rate (which is also known as the Q value) into the Hydraflow Storm Sewers Extensionin either of two ways:

■ Known Q: If the flow rate for each line is known, the Hydraflow Storm Sewers Extension can use it in itscalculation.

TIP To calculate Q values, you can use the Hydraflow Hydrographs Extension, which is included with AutoCADCivil 3D 2010.

■ Rational Method: If the flow rate is unknown, the Hydraflow Storm Sewers Extension can calculate itfrom known data, including drainage area, runoff coefficient, and time of concentration.

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In this skill builder, the Q value is not known. You will calculate the Q value using the rational method.

Specify the drainage area for each line

1 In the Hydraflow Storm Sewers Extension window, click the Pipes tab.

Design data for all pipes in the network is displayed in a spreadsheet. You can edit the data in anyof the cells, with the exception of the Line No. and Dnstr Line No. columns. The Inlets tab displayssimilar data for network structures.

NOTE Notice that in the N Value (n) column, 0.013 is displayed in every cell. This is the default designvalue that you specified in the Specifying Baseline Design Data in the Hydraflow Storm Sewers Extension(page 5) exercise. You can change this value for lines as needed.

2 In the Drnge Area (ac) column, enter the following values:

NOTE These are the subcatchment area values that are shown inCivil3D_2010_skillbuilder_storm_sewers.dwg on the _SUBCATCHMENT-AREAS layer. Main and outfallpipes do not require a drainage area value.

■ Main 15+00 (R): 0.04

■ Main 15+10 (L): 0.04

■ Main 0+50 (L): 0.06

■ Main 0+60 (R): 0.06

■ Main 11+10 (R): 1.06

■ Main 11+00 (L): 1.18

■ Main 6+40 (R): 0.30

■ Main 6+50 (L): 0.36

■ Main 3+50 (L): 1.48

■ Main 3+60 (R): 1.85

■ Main 8+00 (R): 0.68

■ Main 8+10 (L): 1.35

3 In the toolbox, click .

The drainage areas are applied to the project. Next, you will experiment with another method ofentering known data into your project.

Specify the runoff coefficient for each drainage area

1 In the toolbox, click .

The Add/Edit dialog box enables you to view and edit data for one pipe or inlet at a time. In thefollowing steps, you will use the Add/Edit dialog box to apply a common runoff coefficient to arange of pipes.

NOTE On the Pipe tab, the User-Defined area enables you to enter station values for the start and endof each pipe. This information can be useful when generating reports for your project.

2 In the Add/Edit dialog box, on the Pipe tab, under Flows, for Runoff Coefficient, C, enter 0.40.

NOTE A table of runoff coefficients for common areas is located in the Hydraflow Storm Sewers Extensionhelp in the Appendix section.

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3 Click Global.

4 In the Global Edit Runoff Coefficient dialog box, click All.

The From Line No. and To Line No. fields are automatically populated with the first and last lines inthe network. You can also use the drop-down lists to limit the range to which to apply the data.

NOTE If a line does not have a drainage area, then it does not need a runoff coefficient value. The main lines,into which the catch basin branches drain, do not require either value. The runoff specified coefficient valuewill be ignored during the calculation.

5 Click OK. Click OK to acknowledge that the global edit operation has been successfully completed.

6 In the Add/Edit dialog box, click OK.

The changes that have been made to the currently selected pipe are applied, and the navigation buttonsare available, enabling you to select other pipes to edit.

Calculate the time of concentration for each drainage area

In the Add/Edit dialog box, under Flows, notice that there are three methods of specifying Time ofConcentration (Tc). In the following steps, you will use two of these methods.

1 Click to return to the first line (Main Outfall). Click three times to advance to line 4 (Main15+00 (R)).

2 Under Flows, for Tc Method, select FAA. Click the FAA button.

The values that you enter in the Tc By FAA Method dialog box can be obtained from the AutoCAD Civil3D site using surface slope and distance labels. The Tc by FAA method uses the distance and slope fromthe most remote upstream point in the subcatchment area to the inlet.

3 In the AutoCAD Civil 3D window, click Home tab ➤ Layers panel ➤ Layer list. Click to turn on the_SUBCATCHMENT - Tc LABELS layer.

Labels that indicate the slope and maximum distance for each subcatchment area are displayed in thedrawing.

NOTE If the slope labels do not appear, enter REGEN on the command line.

4 In the Hydraflow Storm Sewers Extension window, in the Tc By FAA Method dialog box, enter thefollowing values, which are those found in the labels you turned on in Step 3:

■ Flow Length (ft): 67.82

■ Watercourse Slope (%): 5.8

■ Runoff Coefficient, C: 0.7

NOTE The Runoff Coefficient value is the value you entered for all lines in the Specifying Baseline DesignData in the Hydraflow Storm Sewers Extension (page 5) exercise. This subcatchment area is primarilyasphalt and concrete, so a higher runoff coefficient value should be used.

5 Click Compute.

The resulting Travel Time, Tc, (min) is 3.30.

6 Click Exit.

7 In the Add/Edit dialog box, click OK.

8 Click to advance to line 5 (Main 15+10 (L)).

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To save time in this skill builder, the remaining Tc values are provided. For this skill builder, youcan specify the Tc values in either of the following ways:

■ Skip this step and use the Updated_Main_Road_Network_For_Analysis.stm file before you run theanalysis on the network.

■ Set the Tc Method to User. In the Inlet Time field, enter the data that is displayed in the following

table. Click OK, and then click to advance to the next line.

Inlet Time (min)Runoff Coeff (C)Line ID

3.00.7Main 15+10 (L)

3.00.7Main 0+50 (L)

3.60.7Main 0+60 (R)

13.30.4Main 11+10 (R)

13.20.4Main 11+00 (L)

13.20.4Main 6+40 (R)

12.60.4Main 6+50 (L)

12.20.4Main 3+50 (L)

13.00.4Main 3+60 (R)

14.90.4Main 8+00 (R)

24.90.4Main 8+10 (L)

NOTE Some of the Inlet Time values are less than the minimum value that you examined in the SpecifyingBaseline Design Data in the Hydraflow Storm Sewers Extension (page 5) exercise. When the calculationis generated, these values will be replaced with the minimum value, which is 5.

9 Click Exit.

Specifying Inlet/Junction DataIn this exercise, you will specify the grade conditions at each inlet.

1 In the Hydraflow Storm Sewers Extension window, click the Plan tab.

2 In the toolbox, click .

3 In the Add/Edit dialog box, click the Inlet/Junction tab.

The data for inlet 1, which is the manhole junction at station 9+00 is displayed. This manhole isthe junction of the main storm sewer lines and the outfall line. Notice that the Inlet Type is Manhole.

4 Click OK to activate the navigation arrows.

5 Click three times to advance to Inlet 4.

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6 Under General, make sure that the On Grade option is selected.

The Hydraflow Storm Sewers Extension interpolates whether the inlet is on grade or in a sag curve basedon the inlet rim elevations. Depending on the actual surface conditions, you may have to change thisoption.

Notice that Inlet Type is set to Grate Inlet. When you exported the pipe network to an STM file, theinlet type was assigned based on the AutoCAD Civil 3D part type and the settings in the Storm SewersMigration Settings.

7 Next to Inlet Type, click .

This action causes the parameters you specified in the design codes to be applied to the inlet.

8 For Bypass Target, select Line 12 --- Grate Inlet.

When the flow to the current inlet exceeds the inlet capacity, the excess flow is sent to the BypassTarget, which typically is the next inlet downstream.

9 In the AutoCAD Civil 3D window, click Home tab ➤ Layers panel ➤ Layer list. Click to turn off the

_SUBCATCHMENT-AREAS and _SUBCATCHMENT-Tc LABELS layers. Click to turn on the_INLET-LONG-SLOPE-LABELS layer.

Labels that indicate the gutter slope are displayed in the drawing. These were created using Line andCurve slope labels along the gutter feature line.

NOTE If the slope labels are not displayed, enter REGEN on the command line.

These labels are used to obtain the Longitudinal Slope value for inlets that are located On Grade.

10 In the Hydraflow Storm Sewers Extension window, under Gutter Details, for Longitudinal Slope, enter0.06.

The other values on this tab are taken from the design codes that you specified in the Specifying BaselineDesign Data in the Hydraflow Storm Sewers Extension (page 5) exercise.

11 Click OK.

12 Click to advance to the next inlet. Follow steps 6 through 11 to enter the following inlet designdata:

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NOTE To save time, you can skip this step and use the Updated_Main_Road_Network_For_Analysis.stmfile before you run the analysis on the network.

Longitudinal SlopeBypass TargetLocationInlet TypeInlet ID

0.06Line 13On GradeGrate InletMain CB 15+10 (L)

N/AOffsiteN/AManholeMain MH 8+05

N/AOffsiteN/AManholeMain MH 6+00

N/AOffsiteN/AManholeMain MH 3+55

N/AOffsiteN/AManholeMain MH 0+55

0.4Line 16On GradeGrate InletMain CB 0+50

0.8Line 17On GradeGrate InletMain CB 0+60

0.06OffsiteOn GradeGrate InletMain CB 11+10 (R)

0.07OffsiteOn GradeGrate InletMain CB 11+00 (L)

0.01Line 18On GradeGrate InletMain CB 6+40 (R)

0.01Line 19On GradeGrate InletMain CB 6+50 (L)

N/AOffsiteOn SagGrate InletMain CB 3+50 (L)

N/AOffsiteOn SagGrate InletMain CB 3+60 (R)

N/AOffsiteOn SagGrate InletMain CB 8+00 (R)

N/AOffsiteOn SagGrate InletMain CB 8+10 (L)

NOTE The longitudinal slope values you enter are the average of the values shown in the applicableslope labels.

13 Click Exit.

14 On the main toolbar, click .

15 Click OK to acknowledge that the project has been saved.

Analyzing the Storm Water NetworkIn this exercise, you will perform an analysis on the storm sewer network. The analysis will recalculatepipe sizes and inverts, and present you with a redesigned network. Then, you will make manualmodifications to the network.

NOTE This exercise demonstrates one method of performing a simple analysis. Other analyses are availableto suit a variety of applications.

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Specify parameters and run the analysis

NOTE Make sure the Plan tab has focus before you run the analysis.

1 In the Hydraflow Storm Sewers Extension window, on the main toolbar, click .

2 In the Open Project dialog box, navigate to the Skill Builders\Storm Sewers folder (page 1). SelectUpdated_Main_Road_Network_For_Analysis.stm. Click Open.

This file contains the modifications that you made to the network in this skill builder. Using this fileensures that you will get the results that are described in this exercise.

3 On the main toolbar, click .

4 In the Compute System dialog box, specify the following parameters:

Hydrology

■ Return Period: 2-Yr

NOTE This value is necessary when the flow rate is not known. If you are using known Q values, you donot need to set this value.

User Options

■ Use Interactive Feature: Selected

Calculation Options

■ Analysis w/ DesignThis option computes system flows, and then analyzes and designs the system starting at the outfalland proceeding upstream. All data specified in the design codes are maintained, while any parametersthat are set to either 0 or Design will be designed during the analysis.

First, pipe sizes are calculated, based on the specified design velocity. Next, the invert slopes arecalculated based on Manning’s equation and the pipe area. Based on the design codes, the downstreamcrown (or invert) is set to equal to the next downstream line’s crown (or invert).

Design Options

■ Reset Pipe Sizes: Selected

■ Reset Invert Elevations: SelectedThis option resets all invert elevations to zero. During the analysis, the outfall crown (or invert) isset to the starting hydraulic grade value, and then designs the invert elevations for lines upstream.

■ Hold Outfall Invert(s): Selected

Starting HGLs

■ Invert Elev Dn (ft): 100.00This option specifies the elevation of the outfall

■ Starting HGL (ft): CrownThis option specifies that the water level at the outfall is at the top of the pipe.

5 Click OK.

The first line in the system is displayed in the Storm Sewer Design dialog box, which is also known asthe Hydraflow Storm Sewers Extension interactive feature. Three lines are displayed in the profile view.

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■ The solid green line is the proposed grade, which is interpolated using the inlet rim elevations.

■ The dotted green line illustrates the minimum cover specified in the design codes.

NOTE The minimum cover line only appears when the calculation option is taking minimum coverinto account. When using the Analysis w/Design calculation, the minimum cover is ignored.

■ The red line illustrates the hydraulic grade line (HGL), which is calculated from the parametersthat were entered in the Hydraflow Storm Sewers Extension. Notice that the HGL is at the pipecrown, as you specified in Step 4.

■ The black dashed line illustrates the energy grade line (EGL).

NOTE If the EGL is not visible, click .

The values at the bottom of the dialog box can be adjusted to suit the design requirements. In thisdesign, the downstream end of the outfall invert must be at 102.00’.

Refine the design

1 Click the Invert Dn cell.

Notice that the Dn cell becomes yellow, and a marker appears at the downstream end of the pipe.

2 Click the Invert Up cell.

Notice that the Up cell becomes yellow, and a marker appears at the upstream end of the pipe. Thedownstream and upstream ends of the pipe can be adjusted either independently or together. Inthis case, because the required outfall crown value (102.00’) is greater than the current Invert Upvalue, and the HGL must be maintained at the outfall crown, you will adjust both values at thesame time.

3 Click the Invert Dn & Up cell.

4 Use the buttons to increase the Dn and Up values until the Dn value is 102.00.

NOTE The value changes at the increment indicated by the slider to the left of the table. You can adjustthe increment at any time.

Notice that your changes to the design are updated in real time.

5 Click the Up button three times to advance to Line 4.

NOTE Click the button that is labeled Up, and not the up arrow.

6 Click Inlet Section.

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A section view of the inlet at Line 4 is displayed. The inlet design parameters are displayed in the tableat the bottom of the screen. In the diagram, the blue area indicates the flow at this inlet. This inletcaptures 100% of the flow.

7 Click the Up button eight times to advance to Line 12.

At this inlet, the amount of flow exceeds the capacity of the inlet. The excess flow, which is representedby the narrow portion of blue above the inlet, is sent to the inlet that is designated as the bypass target.

8 Click the Up button four times to advance to Line 16.

This is one of the inlets that is in a sag condition. Notice that the flow greatly exceeds the capacity ofthis inlet. This provides an obvious indication that the design of this inlet must be modified to mitigateflooding.

9 Click the Grate Length cell.

10 Use the buttons to increase the Length value to 4.00.

Notice that doubling the grate length increases the amount of flow that is captured by the catch basin.Changes to the inlet section are displayed in real time.

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Further exploration: Using what you learned in this exercise, experiment with changing other inletand pipe parameters.

11 Click Finish.

12 Click Options ➤ Plan View ➤ Background Image ➤ Clear.

The analysis is complete, so the referenced alignments and parcels are no longer needed in theStorm Sewers project.

13 Click File menu ➤ Save Project As.

14 In the Save Project As dialog box, for File Name, enter Main_Road_Network_Updated.stm. Click Save.

15 Close the Hydraflow Storm Sewers window.

Importing the Revised Network into AutoCAD Civil 3DIn this exercise, you will import the revised storm sewer network design into the original site in AutoCADCivil 3D.

Import the revised network into AutoCAD Civil 3D

1 In the AutoCAD Civil 3D window, click Insert tab ➤ Import panel ➤ Storm Sewers .

2 In the Import Storm Sewers File dialog box, navigate to the Skill Builders\Storm Sewers folder (page1). Select Main_Road_Network_Updated.stm. Click Open.

3 When prompted, click Update The Existing Pipe Network.

NOTE If Event Viewer is available, it displays a warning message that indicates that the outfall structuresize was not matched exactly. When an exact part size is not found, AutoCAD Civil 3D substitutes thenext larger size.

The revised pipe network is displayed in the drawing.

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4 Zoom in to the area between stations 8+00 and 9+00.

■ The pipes and structures that you added in Adding Lines to the Storm Sewer Network (page 12) aredisplayed at station 8+00.

■ All the pipes and structures use the styles that were specified in Specifying Migration Settings inAutoCAD Civil 3D (page 7).

■ The structure markers are at the default, unrotated angle. You must rotate the structures manually.

Further exploration: Use the process described in this skill builder to analyze the Loop Road Storm SewerNetwork that is included in the supplied drawing.

Autodesk, AutoCAD, AutoCAD Map, and AutoCAD Civil 3D are registered trademarks of Autodesk, Inc., in the USAand/or other countries. All other brand names, product names, or trademarks belong to their respective holders. Autodeskreserves the right to alter product offerings and specifications at any time without notice, and is not responsible fortypographical errors that may appear in this document. ©2009 Autodesk, Inc. All rights reserved.

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