University Course Notes 2008_9 v9.0 on and Off Campus

7/30/2019 University Course Notes 2008_9 v9.0 on and Off Campus

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InfoWorks CS V9.5 Training

Scott Arthur [email protected]

Background

Numerical Modelling and InfoWorks CS

InfoWorks CS is a numerical model that allows a sewerage system tobe represented on a computer. All the physical characteristics of thesewer such as the pipes, manholes, pumps etc are representedalong with the population, trade and rainwater runoff that contributeto them.

Modelling is a valuable tool in assessing the spill volumes, frequencyand water quality implications of combined sewer overflows (CSOs).

It can enable cost effective solutions to CSOs be identified. It canalso be used to resolve problems associated with structuraldegradation and network incapacity. It can help analyse why certainproperties suffer from flooding and which solution is cost effectiveand sustainable. It can also be used to establish whether theexisting system holds the capacity for increased flows from newdevelopments or future water demands.

This course provides an introduction to InfoWorks CS. Two practicalexercises are included.

CONTENTS

1: Preparing the data.................................................................................................................2

2: Viewing a network plan in the database................................................................................4

3: Analyse system with thematics.............................................................................................7

4: Add a layer to the GeoPlan...................................................................................................9

5: Viewing network data in Grid View.....................................................................................9

6: Editing network data...........................................................................................................12

7: Importing a Rainfall file......................................................................................................14

8: Running a simulation..........................................................................................................15

9: View variable results in GeoPlan........................................................................................17

................................................................................................................................................18...............................................................................................................................................18

10: View variable results in other views................................................................................19

11: Adding new Nodes, Links and Subcatchments in GeoPlan...............................................20

12: Moving Nodes and redefining Subcatchments in GeoPlan...............................................22

Exercise 1 : Model Build and Storage Design.........................................................................23

..............................................................................................................................................32

Assessment.............................................................................................................................35

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INFOWORKS CS TRAINING PRACTICALS

If you are working from home, please read the Infoworks - GettingStarted guide and install InfoWorks CS on your computer. You will needaround 1Gb of free space on your PC.

1: Preparing the data.

This initial exercise simply describes how to import some data to be

used in the following exercises. The format of the data to be imported in

comma separated variable (.csv) data, which is readily compatible with

Excel.

1. Create a folder in your network drive (or hard-drive if you are at

home) to hold your InfoWorks CS files (e.g. H:\infoworks\, or

C:\infoworks if you are at home).

2. Copy the G:\student info\scott-arthur\InfoWorks\IWCS University

data\ folder to the one which you have just created. If you are off-

campus, please retrieve the appropriate data from the CD you have

been supplied.

3. Start InfoWorks CS 6.5

4. Click File

Select Master Database. Set the local root as the directory you created (e.g

H:\infoworks\).

Set your H:\infoworks\UDDA.iwm as the Master Database

Path.

5. Select File Open Catchment Group. Then select the Catchment

Group 1 and select Open. A white column should appear on the left

hand side of the screen with five items in it.

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6. Right clickon the Demo Tutorial item and select Import Network

from CSV files.

7. Simply hit OKat the next dialogue box (which is called Import /

Update from CSV data.)

Search and find the Langley_demo_version II.csv file, which should

be inyourIWCS University data\ folder. Hit Open. After a brief

pause, this will appear to return to the same dialogue box, without

anything having happened (this is a quirk of Microsoft rather than

InfoWorks CS.)

8. Now hit Cancel and the import will be performed.

9. Select OKand a network called Langley_demo_version will be

created. A yellow box should appear in the white column to the left.

10.Shut the summary sheet that lists the new objects that have been

created1.

1

If this contains an error relating to the units mismatch, you will need to changethe operation to metric. To do this go to the tools menu and click on Tools

Options Units Metric (Native) OK.

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2: Viewing a network plan in the database.

This exercise introduces the various ways of viewing and examining

networks in the database.

1. Right click on the network Langley_demo_version and select Open.

To explore the GeoPlan of the network use the following tools:

to Pan, Zoom In, Zoom Out

TIP:- Pressing the SHIFT key activates a QuickZoom feature. This allows you

to zoom in on the network without changing the currently selected tool.

- Right clicking on the GeoPlan provides zoom in/out features, and

allows you to return to previous views. It is also possible to focus on

selected objects or view the entire network.

to view Properties of various items in the network

to visualise the Long Section of pipes

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for a 3D view of manholes

NOTE: The 3D view toolbar is used to rotate and move the view of the

manhole.

Alternatively, the view can be moved using the cursor keys.

Holding CTRL, with the up/down key, will rotate the view.

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Holding SHIFT, with the up/down key, will move the view vertically up or

down.

Labels can be included over the network plan

NOTE: The required label information is defined from the Geo menu,

Long Label Properties.

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3: Analyse system with thematics

In this exercise we shall create a thematic based on the pipe full

capacity. Other useful thematics are contours and pipe widths. These

have not been included in this exercise due to the small size of the

catchment.

1. Right click on the GeoPlan and select Themes

2. Click on the Links Tab.

3. Choose Field type Capacity (Conduit Full Capacity). Select Ranged

Theme Type, and check for Auto Scale and Auto Colours.

4. Define 3 Ranges and Scale Now. Select colours for the highest and

lowest ranges.

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5. Explore results in the GeoPlan.

6. Analyse Link Themes, such as pipe width or roughness, in the same

manner.

TIP: A legend for the themes, contours and other visual settings

displayed on the GeoPlan can be activated with the Thematic Key

Window button ( ) on the toolbar A key for the defined data flags2 is

also shown.

The window can be switched on/off as required.

2

You can associate a data flag with each piece of data. The flag can be used toindicate, for example, where the data came from or how reliable you consider it tobe.

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4: Add a layer to the GeoPlan.

This exercise shows how to include an ESRI SHP layer into the GeoPlan.

1. Right click on the GeoPlan and select Layer Control.

2. From the Layer Control dialog box select Insert.

3. Select Map_demo_polyline.shp from the ESRI Data directory in:

G:\student info\scott-arthur\InfoWorks\IWCS\Maps University data\

and press OK.

TOP TIP: If you find that the map obscures your view of the network,

disable it (Right click on the GeoPlan and select Layer Control & clear

the Visible checkbox.) or change the coulour of the map (Right click

on the GeoPlan and select Layer Control & click Properties .):

5: Viewing network data in Grid View

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You can view the network data in 3 formats; Grid, GeoPlan andLongsection

Network information on the nodes, links and subcatchments can be

viewed in grid format:1. From the toolbar, select the appropriate button to explore the grid

data.

New Links grid (pipes etc)

New Nodes grid (manholes etc)

New Subcatchments grid

2. Explore the network grids.

NOTE: Clicking on the Properties button, and then holding down the

CTRL key when selecting a network object will take you to the

appropriate record in the network object grid.

Useful Grid View Options:

- Sort Records: Right click on the grid in a specific column and select

Sort Records on this Column, and thenAscending or Descending, as

required.

- Find object: To locate a particular object from the grid in the

GeoPlan, right click and select Select and Find in GeoPlan:

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6: Editing network data.

Node, link and subcatchment information can be edited directly with the

Properties tool, or in the grid data view. Networks are required to

be checked-out before edits can be made3. Simulations can then

only be carried out after the network has been validated and checked-in

again. In this exercise we will check-out the network and look at

making edits to the network data.

1. Right click on the Langley_demo_version network icon and Check

Out. Name the network Langley_Demo Manhole Modification.

2. To view the network alone, right click on the GeoPlan, and choose

Layer Control. Highlight the Map_demo_polyline layer and

uncheck the Visible box.

Network objects can be selected using the arrow Select icon. Press

the CTRL key to select several objects simultaneously. The

Polygon Select icon ( ) is available to highlight an array of

objects within a specific area.

3. Use the Polygon Select tool to highlight an area of the network.

4. Open the Nodes Grid window.

5. From the Grid menu, choose Group Network Selections at top of

Grid. Or alternatively use the Group Selections ( ) icon from

the toolbar.

6. Scroll across to the Chamber Plan Area column, and drag to

highlight the required nodes.

7. Right click in the highlighted area, choose Current Cell(s) Flag. The

data flag should be set for No Flag, not default #D, before the data

can be altered.

TIP: New data flags can be defined from the Tools menu. Choose UserDefined Flags, and then new flags, with the name and colour ofyour choice, can be entered.

8. Highlight the required cells again, right click and choose Current

Cell(s)Value, and Set new value for cells. Set a new chamber plan

area value of 1m2 for the selected nodes.

9. Close the Node Grid, and return to the GeoPlan view.

3TOP TIP: look out for R/O (read only) at the top of any window you

are trying to edit it means the network has not been checked out.

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10.To check that there are no obvious problems with the network, it is

important to validate it. Click Networkthen Validate network.

11.You may get a warning4 that a manhole shaft and chamber is too

small. If this is the case, double-click the message (or go to the

nodes grid) and ensure all the manhole5 shafts and chambers are

1.0m2 or greater6.

12.Validate the Network until you get no warnings.

13.Right click and Check in the Network. If asked, click YES to

validating the network.

We now have two versions of our network; the original and the modified

version.

4 Warnings can often be ignored. However Errors must be rectified.5

Node TM45630094 is an Outfall and, as such, its area cannot be changed.6 Alternatively, you can decrease the minimum allowed manhole shaft/chambersize: click Network, then Simulation Parameters.

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7: Importing a Rainfall file

Rainfall data can be either generated in InfoWorks as design storms7 or as

observed data. Design rainfall can be created for specific return periods

such as 1 in 1, 2 5, 10, 25 etc years. A 100-year return period event would

occur on average every 1 in 100 years. Observed data is that which has

been actually measured and can be imported into InfoWorks or can be

copied and pasted from Excel.

In this exercise we shall import a rainfall file with a .RED extension.

1. Right click on the Demo tutorial catchment Group and select New -

Rainfall Group.

2. Call it Rainfall Group.

3. Right click on the new Rainfall Group and select Import- Event.

4. Import the Obs4p.RED file from the Rainfall directory in:

G:\student info\scott-arthur\InfoWorks\IWCS University data\

5. Expand the Rainfall Group, right click on the rainfall event icon and

Open As a Graph.

6. Close the Rainfall event.

7

InfoWorks has the following rainfall generators built-in: UK Rainfall Generator, UKRainfall (FEH) Generator, Hong Kong Rainfall Generator, Desbordes RainfallGenerator, QM French Rainfall Generator & Belgian Rainfall

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The rainfall profile has now been imported for later use.

8: Running a simulation

This exercise shows how to schedule a simulation.

1. Right click on the Demo Tutorial Catchment Group and select New -

Run Group.

2. Call it Run Group.

3. Right click on the run group. Select New, and Run.

4. In the Schedule Hydraulic Run window, give a run title

Langley_demo_run. Drag in the network Langley_demo_version

and the Obs4p rainfall event.

5. Change the Results time-step multiplier to 1.

6. Change duration to 240 minutes.

7. Click on Run Simulation8.

TIP:

8 The Simulation Controller will appear and indicate the run status. The runshould be complete in less than 10 seconds. If the run fails, it is most probably

because you have run out of disk-space. To get details on how the runprogressed, right-click on the Obs4p Run, select Open as and then LogResults (text).

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- Time-step Control: This can be used to control the results output

during Dry Weather Flow, typically for simulations with time-series

events. Also, criteria can be set which define when to end a simulation,

relative to rainfall, outflows, etc.

- Simulation Controller: Simulations can be terminated, and the

program of simulation runs reordered. The duration of the current

simulation may be altered, and the controller can be set to pause

between simulations.

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9: View variable results in GeoPlan

1. Double-click Obs4p run (the green icon in Run Group folder) and the

results should open in the GeoPlan area.

2. Use the toolbar buttons to replay the simulation in GeoPlan view.

Buttons: Rewind (to start) / Back Step (per results time-step) / Pause /

Step Forward / Play / Fast Forward (to end).

Flooding should occur around 90 minutes into the simulation.

Other useful tools:

- Jump To a specific time in the simulation.

- Show Maxima, to display the maximum values reached

during the simulation.

- Clear Results, to remove simulation results from the display

3. Right click on the GeoPlan and select Themes. Limits for Link Arrowsand flooding Node Circles can be defined as required.

4. Use the Graph pick tool ( ) to analyse points in the system.

5. From the Geo menu, select Long label properties.

6. From the Network Label Field Settings dialogue, choose various time

varying parameters, from the Node and Conduittabs - OK.

7. Use the Label tool ( )and select a number of nodes and conduits.

8. Replay the simulation.

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10: View variable results in other views

1. Choose Long Section Pickfrom the toolbar and select a long section

to view the replay.

2. Replay results in Long Section.

3. Right click and select Properties

4. From the Long Section Properties dialogue,select Setup.

5. From the Network Label Field Settings dialogue, select some of the

time varying parameters from the Node and Conduittabs -OK.

6. Replay results in Long Section.

7. Choose 3D Pick from the toolbar. Select a node and view the replay.

8. Choose one of the toolbar buttons to display results in Grid view.

- Link Results Grid

- Node Results Grid

- Subcatchment Results Grid

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11: Adding new Nodes, Links and Subcatchments

in GeoPlan.

In this exercise you will find out how to add new nodes, links andsubcatchments to the network.

1. Right click on the Langley_Demo Manhole Modification network icon

and Check Out and Branch.

2. Call the network Langley_New Development.

3. Add the layer demo_new_ development_polyline.shp from the ESRI

data directory:

G:\student info\scott-arthur\InfoWorks\IWCS University data\Maps\4. Take the cross off of the visible column for the map_demo_polyline,

so that that layer is no longer visible (optional).

5. View the direction of flow in the nearest link by right clicking on the

Geoplan and selecting Themes. Select the Link Arrows tab and tick

the Link Direction Box.

TM44634601

TM44634602

TM44634601

TM44634602

6. From the toolbar select the New node icon ( ).

7. Create a new combined node in the system. For this exercise there

is no need to specify all of the necessary details.

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8. Connect to the network by using New link ( ) to connect the

new node to an existing node.

9. Select the new node, at the upstream end of the link, and then

select a node for the downstream end.

10.Create a New Subcatchment ( ) around the new node.

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12: Moving Nodes and redefining Subcatchments

in GeoPlan.

Nodes and subcatchments can be edited directly on the GeoPlan.Nodes can be manually relocated, and subcatchment boundaries can be

redefined.

1. From the toolbar, select the Move Nodes icon ( ).

2. Zoom in to the new node created in the last exercise, select the

new node, and click somewhere outside of the subcatchment

boundary to relocate the node.

3. Select the Reshape Subcatchments ( ) tool.

4. Click within the new subcatchment to select, and redefine the

subcatchment boundary to enclose the node.

Other Useful Tools for Editing and Viewing in the

GeoPlan:

- Find network objects: Search for network objects using wildcard

characters. Selected objects can be located in the GeoPlan view.

- Select all objects.

- Clear selection.

- Invert current selection.

- SQL Select: Select network objects using an SQL Query. Objects are

selected according to the specified criteria.

- Distance Tool: Activates the Distance Estimation Tool. The distance

from the start point of the specified red line to the current cursor

position is displayed in the status bar, and constantly updated. Click

the mouse button to register intermediate points. The first figure is

the distance from the start point to the last clicked point. The second

figure is the distance from the last clicked point to the current position

of the cursor. The third figure is the total distance from the start to the

current cursor position.

- Trace and select links: Trace the path from any node or link on the

network to the outfall point. Alternatively, holding down the CTRL key

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while selecting the node or link will highlight all the nodes and links

upstream.

Exercise 1 : Model Build and Storage Design

This practical teaches how to build an InfoWorks CS model representingthe combined sewerage system serving part of a small town. The model isthen used to determine the amount of detention storage required to limitthe flows to a treatment works to acceptable levels.

Steps 1 12 : Model Build

The first task is to construct the model.

1 Import9 the file empty1#1.csv from

G:\student info\scott-arthur\InfoWorks\IWCS University data\.2 Check out the model empty1#1 (which is just an empty networkwith the required default parameters applied, it is a good startingpoint for all models) and call it model1.

3 Right click on the icon model1 and select open. It should appearas just a blank space.

4 Right click in the white area (the geoplan) and go into layer control5 Select insert and then browse and find the file

Demo_road_roof_polyline.shp and Demo_road_roof_region.shpthen hit OK to go back to the geoplan.

6 Right click again on the geoplan and select view entire layer,choose all layers and hit OK, the map should then be visible. The

colours of these objects can be changed by going back into layercontrol and selecting the properties button.

9Reminder: right-click on demo tutorial import from CSV file [find file] OK

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7 The next task is to create the nodes, links and subcatchmentsrepresenting the sewerage system. Check-out the model, open thenodes grid and enter the following information, then close the nodesgrid. Once complete, the nodes should then be visible on thegeoplan. Note that the last node in the system (8) should be defined

as an outfall, whereas all others should be defined as manholes.

Node SystemType

GroundLevel

XCoordinate

Ycoordinate

1 Combined 144.901 342898.6 864890.32 Combined 141.921 342760.9 865154.53 Combined 137.161 342550.3 865581.14 Combined 135.514 342466.1 865722.75 Combined 132.82 342970.3 865705.96 Combined 130.917 342899.1 865877.17 Combined 122.772 343615.8 866264.18 Combined 121.023 343612.7 866438.9

8 Use the new links tool to connect up the manholes, which areshown in the diagram below.

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9 Use the information tool to input the characteristics of the links fromthe details in the table below10. Make sure that the system is set tocombined.

US

NodeID

DS

NodeID

Shap

eID

Widt

h(mm

)

Heigh

t(mm)

Bottom

Roughness

Top

Roughness

US

InvertLevel

(m AD)

DS

InvertLevel

(m AD)

1 2 CIRC 600 600 0.3 0.3 142.901 139.921

2 3 CIRC 600 600 0.3 0.3 139.921 135.161

3 4 CIRC 600 600 0.3 0.3 135.161 133.514

4 6 CIRC 600 600 0.3 0.3 133.514 128.917

5 6 CIRC 600 600 0.3 0.3 130.820 128.917

6 7 CIRC 600 600 0.3 0.3 128.917 120.772

7 8 CIRC 600 600 0.3 0.3 120.772 119.023

10 InfoWorks will assume the links are straight and calculate lengths automatically.

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Use the new subcatchment tool to create the 7 subcatchments as shownin the figure below. Name the subcatchments the same as the nodereference that they drain to.

10 Open the subcatchment grid and for all subcatchments, set the areameasurement type to percent runoff area 1 to 3%, runoff area 2 to3% and runoff area 3 to 4%11. This assumes that a total of only 10%of the total area contributes to this system12.

Infiltration can be applied to the model in the baseflow field of the

subcatchment table. The infiltration for this model will be estimatedas half the population13 flow. Calculate the flow per person in m3/s.

145 l/h/d = 0.145 m3/h/d0.145/86400 = 1.6782 x 10-6 m3/s

Then to calculate the infiltration:Infiltration = Population x Flow per person (m3/s)

2TIP: You can copy and paste the population column from InfoWorksinto an Excel spreadsheet where you can perform the calculations14:

Your data should resemble this:

11 This defines how much of the subcatchment belongs to the particular runoffsurface type. If the area measurement type is absolute, this is a value in hectares.If the area measurement type is percent, this is a percentage of the contributingarea. The runoff characteristics of the Runoff Surface are defined in the GridRunoff Surface View. See Appendix 1.

12Failing to select percent is the most common error made in this exercise!13 Population - If you leave this field blank the software calculates the populationfrom the contributing area and the population density in the land use definition.

14 Expect slightly different results due to catchment definition process.

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Sub-Catch PopulationPop Flow

m3/h/d

Pop Flow

m3/d

Pop Flow m3/s

Infiltration

m3/s

1 470 0.145 68.2 0.00079 0.00039

2 1309 0.145 189.8 0.00220 0.00110

3 780 0.145 113.1 0.00131 0.00065

4 640 0.145 92.8 0.00107 0.00054

5 1126 0.145 163.3 0.00189 0.00094

6 356 0.145 51.6 0.00060 0.00030

7 738 0.145 107.0 0.00124 0.00062

11 Head losses can be automatically calculated in InfoWorks. Firstlycheck that the flags are set to #D (shaded blue) for the upstreamand downstream headlosses in the link grid conduit view. Thenselect Network on the main menu and then Infer Network Data.

Tick the Conduit headloss type and coefficient box and InferHeadloss with default flag #D as shown in the figure below 15.

12 Validate [Network menu] the model and check that there are noerrors, then check the model in16.

15 This may already be done.16 Expect 1 built-in error.

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Step 13: Calculating 6 x Dry Weather FlowWe will assume the outfall is to a WWTW which as a limit of 6 times DWF;we will have to design a CSO to cope with any excess.

13 The next task is to calculate six times the Dry Weather Flow (DWF)

and limit the discharge from the model.

Calculate average dry weather flow using the formula below17:

6DWF = 6 x (( P x C) + I + T)

17

For more information on this relationship see section 10.3.2 of Butler & Davies.Your work should resemble this: 6 x ( (5419*145 /(1000*24*60*60)) + 0.00455 +0 ) = 0.08187 m3/s.

28

P = PopulationC = Consumption (assume 145 l/h/d )I = Infiltration (l/s)

T = Trade Flow (0 in this case)


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Steps 14 16 : Inserting a Limiting Discharge Orifice andWeir

The 6xDWF value will be applied as the limiting discharge on an orifice.

14 Check out model1 and call it model2.15 Put in a new manhole (9) using the new node tool as shown in thediagram below, there should be an option to split the pipe (7.1) selectOK. Apply a ground level of 122.772 the new manhole. Delete thepipe 7.118 and replace it with an orifice19:

The theory is that once the limiting discharge of the orifice isreached, excess flows will start to back up the system. If anoverflow weir is placed immediately upstream of the orifice then thevolume of flow over this weir will define the volume of storagerequired.

16 Insert a new node (10 - an outfall20) and a new link21 (a weir) asshown in the figure below. Enter the same ground level as at Node7. The characteristics of the weir are as follows:

18 This is the pipe which connects node 7 to node 9.19

In InfoWorks, this is a link type.20 Choose a location, and set ground level to 122.772 m AOD21 This link will act as a storage tank.

29

Weir Width = 3 mWeir Coefficient = 0.85

Crest Level (mAOD) = 121.7

Orifice Invert = 120.772 m AODOrifice Diameter = 0.6 mDischarge coefficient = 1Limiting Discharge = 6DWF (As calculated above)


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17 Validate the model again and if there are no errors, check it in. Themodel is now ready to conduct the analysis.

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Steps 18 23 : Completing a WWG file

The next task is to define the flow per person.

18 Right click on the catchment group [Demo Tutorial] and create a

new wastewater group (call it waste water group.)19 Right click on this wastewater group and create a new wastewaterevent (called event1.)

20 Open this event and click the Add button. Apply a description andpress OK.

21 Apply a per capita flow of 145 (l/day.)22 In the Profile tab you should find a multiple of 1 from 00:00 to

23:00. This will set a flat profile. Note: The values should add up to24.

23 Close and save the event.

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Steps 24 26 : Creating Design Rainfall

The next task it to define the rainfall for which the storage tank must bedesigned. It is assumed that the tank must hold all the excess flows

generated during a 1:20 year storm. Here the concept of critical durationis introduced because storms of different durations can all have a returnperiod of 1:20 years and all must be assessed to determine which is theworst-case scenario.

24 Right click on the catchment group and create a new rainfall group(call it rainfall group 1.)

25 Right click on this rainfall group and create a new rainfall event(called 20year storms.) Make sure the generate design rainfall boxis ticked.

26 Choose United Kingdom Rainfall. The rainfall will be generatedbased on the Flood Studies Report Methodology.

The dialogue box should be filled with the following values:

Events should be generated for the 15, 30, 60, 120, 240-minutedurations with a 20-year return period. Also the winter profileshould be used.

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Steps 27 32 : Running simulations

Now a series of simulations must be run to determine which is theworst-case storm and how much detention storage is required.

27 Right click on the catchment group and create a new run group(called Run Group 1.)

28 Right click on this run group and create a new run.29 Apply a run title and then drag the network, wastewater and rainfall

into the relevant boxes.30 Apply a duration of 600 minutes and then hit run simulations. The

simulations should be complete in a few seconds.

31 Underneath the run group a white box is created, this contains the

details of the simulation. Underneath that is a series of green boxes,one for each of the rainfall durations.32 Open each of the green boxes in turn and use the information tool

to find the total flow over the weir. The maximum flow defines therequired detention storage.

TIP: Click on Results then Graph reports and select Multiple simulationsReport... Open the GeoPlan and select the overflow pipe. Drag thesimulations into the dialogue box and click on Current for the selection.

Then press OK. This should provide a graph showing the flows in theoverflow pipe for all the storms:

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...Tutorial>Run Group!>Trial 2>M20-15



...utorial>Run Group!>Trial 2>M20-120

...utorial>Run Group!>Trial 2>M20-240

Flow (m3/s)

Mi n

-0.002

-0.002

-0.002

-0.002

-0.001

Ma x

0.803

0.838

0.808

0.605

0.385

Vo lume (m3)

995.704

1273.090

1577.152

1852.884

2049.337

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AssessmentSelect an appropriate design storm return period and design pipework toaccommodate the additional catchment [surface level = 137.00 m AOD]shown below:

1

10

2

3

45

6

7

8

extra

1

10

2

3

45

6

7

8

extra

Your submission should include:1. An introduction which evidences that your starting point networkperforms as per the output on the previous page (i.e. it should include asimilar plot).

2. An overview of any problems which occur when you add the additional

catchment (i.e. Which nodes flood and by how much? How much extraflow passes over the weir?).

3. Describe which options were open to you to reduce the flood risk.

4. Explain why you chose the option you did and why.

5. Demonstrate that you have removed the flood risk.

6. Report any change in the flow passing over the weir and explain whatthe implications of this would be (if any).

7. Draw conclusions.

Your report should:1. Be clear, concise and make good use of graphs and/or tables to explainyour points.

2. Adhere to the normal basic report structure: Introduction, Main Body &Conclusion.

3. Be presented in a professional manner and held together using only asingle staple (i.e. no cheap plastic folders or binders please!).

Marking ScheduleEach of the 10 points above are weighted equally.

Documents

University Course Notes 2008_9 v9.0 on and Off Campus