Course Title: Design underground piping drainage systems and minor culverts

Part B: Course Detail

Teaching Period: Term2 2014

Course Code: CIVE5692

Course Title: Design underground piping drainage systems and minor culverts

School: 130T Vocational Engineering

Campus: City Campus

Program: C6093 - Advanced Diploma of Engineering Design

Course Contact: Program Manager

Course Contact Phone: +61 3 9925 4468

Course Contact Email:

Name and Contact Details of All Other Relevant Staff

Dr.  B. Richards
Ph +61 3 9925 4172

Nominal Hours: 40

Regardless of the mode of delivery, represent a guide to the relative teaching time and student effort required to successfully achieve a particular competency/module. This may include not only scheduled classes or workplace visits but also the amount of effort required to undertake, evaluate and complete all assessment requirements, including any non-classroom activities.

Pre-requisites and Co-requisites

EAC110B Apply engineering hydrology principles
EAX1001B Perform calculations related to simple fluid systems
EDX130B Use technical mathematics (basic)
EDX140B Use technical mathematics (advanced)
EDX100BAnalyse force systems (basic)
EDX090B Analyse force systems (advanced)

Course Description

This unit of competency deals with the skills and knowledge required to design an underground piped drainage system for a small urban development using a simplified procedure outlined in the IEAust publication “Australian Rainfall and Runoff” and to design a minor culvert for a rural road based on procedures outlined in Vic Roads “Road Design Manual”.

National Codes, Titles, Elements and Performance Criteria

National Element Code & Title:

EAC100B Design underground piping drainage systems and minor culverts


01. Interpret the job brief and gather necessary information.

Performance Criteria:

1.1 The preliminary data that should be gathered prior to design is
identified, sourced and collected.


02. Classify major and minor flood events and select the Average Recurrence Interval appropriate to the project.

Performance Criteria:

2.1 The level of protection provided by minor flood control and major
flood control in an urban drainage area is identified.
2.2 Given a job brief for a drainage project, the Average Recurrence
Interval appropriate to the design is selected as specified by
Australian Rainfall and Runoff.


03. Apply the Rational Method to the calculation of peak discharge.

Performance Criteria:

3.1 Calculations are carried out to determine the peak discharge for a
mixed use urban catchment (including grassed reserve), given the
areas, land uses, with runoff coefficients and overland and
channel entry times.
3.2 Calculations are carried out to determine the weighted runoff
coefficient and peak discharge for a rural catchment, given the areas and runoff coefficients.


04. Calculate the design discharge.

Performance Criteria:

4.1 Given the topographic plan of a rural area, the boundary of the
catchment area draining to a rural culvert can be marked on the
4.2 The area of a rural catchment marked on a topographic map can
be determined by CAD, measurement and calculation by counting
graph squares.
4.3 Given a topographic plan of a rural catchment area and the
catchment characteristics, the runoff coefficient and the time of
concentration for the catchment can be determined.


05. Determine a culvert size.

Performance Criteria:

5.1 Design data is assembled
5.2 Depth and velocity of discharge in natural waterway is determined
5.3 Tailwater depth is derived
5.4 Culvert slope is selected to be compatible with site conditions
5.5 Culvert length is determined through embankment
5.6 Allowable headwater depth is set
5.7 Freeboard requirement is established
5.8 Critical depth of flow is determined.
5.9 The Road Design Manual procedure and design charts are used
to establish maximum headwater level.
5.10 Acceptability of headwater level, cover and outlet velocity is
5.11 Culvert trial size is modified and recomputed as necessary.
5.12 Design data is recorded in a form suitable for production as a
drawing, showing headwater level below pavement basecourse,
required cover over culvert and non-scour velocity or adequate scour protection at outlet.


06. Prepare the layout for a piped drainage system for a small urban development.

Performance Criteria:

6.1 Road drainage lines and pits are located
6.2 Entry pit spacing is determined based on flow spread and inlet
capacity and lot discharge
6.3 Design charts are used and calculations carried out to determine
runoff entry and bypass
6.4 An economical route is selected for road drainage to outlet
6.5 Junction pits are located at direction change and at maximum
6.6 Road drainage network is reviewed and adjusted.
6.7 Blocks not served by road drainage are identified
6.8 Easement pits and inlets are located and connected by
economical route to road drains
6.9 Minimum pipe sizes to be used in easements, road reserve and
beneath pavement are established
6.10 The minimum cover is determined
6.11 The pipe lengths are determined
6.12 The catchment areas contributing to each outlet pipe are marked.
6.13 The catchment areas are divided into subarea based on land use
6.14 The subareas entering gutter inlets are identified
6.15 The areas and coefficient of runoff for each subarea are recorded
6.16 The equivalent areas for each subarea are calculated and
summed for each outlet pipe.


07. Determine the time of concentration and peak discharge.

Performance Criteria:

7.1 Roof and gutter time is used for house lotsdischarge.
 7.2 Overland and gutter time is used for grassed and paved areas
7.3 Longest time is used for full area flow.
7.4 Impervious entry time is used for part area flow
7.5 Time in pipe to downstream pipe is estimated and time
downstream from pit to pit summed.
7.6 The longest time at junctions is adopted
7.7 The rational method is used to calculate part area and full area
discharge at each pit
7.8 The maximum flood discharge at critical points is calculated
7.9 The gap flow – overflow is determined at critical points
7.10 Overflow path at intersections, court bowls is considered.


08. Calculate the pit water levels and the hydraulic grade line throughout a drainage system.

Performance Criteria:

8.1 Discharge data is transferred to design sheet
8.2 Minimum freeboard is adopted at pits
8.3 Pit design kerb levels are inserted in design sheet
8.4 Maximum pit water level at each pit is calculated
8.5 Pipeline shock losses are reviewed
8.6 Head loss coefficients for the pits in the network are determined
8.7 The trial pipe size is selected and velocity calculated as Q/A
8.8 Proceeding upstream from outlet the pit water levels are adjusted
for pipes not flowing full
8.9 Maintenance of freeboard is checked.
8.10 Appropriate pipe sizes are selected
8.11 Appropriate pit loss coefficients are selected
8.12 The levels of the inlet and outlet H.G.L at each pit are fixed and
the H.G.L. slope calculated.
8.13 The H.G.L. is plotted on the longitudinal section.


09. Calculate pipe invert levels and grades.

Performance Criteria:

9.1 The obvert at initial pit outlet H.G.L is located
9.2 The inlet is aligned at next pit with pit outlet calculated.
9.3 Minimum fall trough pit is provided
9.4 Pipe slope is checked and pipe levels adjusted is necessary to
maintain obvert below H.G.L. and minimum cover.


10. Check system for overflow and modify where necessary.

Performance Criteria:

10.1 The check sheet and procedure from the most recent “Australian
Rainfall and Runoff” is used to prove veracity of design.
10.2 The design is adjusted as necessary.

Learning Outcomes


Details of Learning Activities

You will be involved in the following learning activities to meet requirements for this course and program
• Lectures
• Tutorials
• Projects
• Site visits
• Invited lecture

Teacher Led
Illustration and outline of the preparation of a job brief
Outline the classification method for major and minor flood events and selection method of the Average Recurrence Interval
Demonstration and application of the Rational Formula to calculate the peak design discharge and application of this discharge to the design of culvert size
Outline steps for the preparation of longitudinal sections incorporating pit water levels, hydraulic grade lines and pipe invert levels and grades
Outline the procedure for producing plans and longitudinal sections for a small urban development

Student Based Problem Solving
Prepare a job brief for a piped drainage system in a simulated work environment
Carry out calculations involving Rational Formula in a simulated work environment
Carry out calculations for the determination of a culvert size to carry flood flow under a road way
Prepare plans and longitudinal sections for a small urban drainage development in a typical Melbourne subdivision

Teaching Schedule

WeekTopic descriptionElement/Performance Criteria
1Interpret the job brief and gather necessary information.
2Class activity submission1.1
2-3Classify major and minor flood events and select the Average Recurrence Interval appropriate to the project2.1, 2.2
4-5Apply the Rational Method to the calculation of peak discharge
3.1, 3.2
6Calculate the design discharge4.1,4.2,4.3
 7 Determine the time of concentration and peak discharge7.1,7.2,7.3,7.4,7.5,7.6,7.7,7.8,7.9,7.10
9Project submission -Part A2.1,2.2,3.1,3.2,4.1,4.2,4.3,7.1,7.2,7.3,
 9 Determine a culvert size5.1,5.2,5.3,5.4,5.6,5.7,5.8,5.9,5.10,5.11,5.12       
 10-12 Prepare the layout for a piped drainage system for a small urban development6.1,6.2,6.3,6.4,6.5,,6.8,6.9,6.19,6.11,
 13-14 Calculate the pit water levels and the hydraulic grade line throughout a drainage system8.1,8.2,8.3,8.4,8.5,8.6,8.7,8.8,
15Calculate pipe invert levels and grade9.1,9.2,9.3,9.4
 15-16 Check system for overflow and modify where necessary10.1,10.2
17-18Project submission-Part B

5.1,5.2,5.3,5.4,5.6,5.7,5.8,5.9,5.10,5.11,5.12, 6.1,6.2,6.3,6.4,6.5,,6.8,6.9,6.19,6.11,
9.1,9.2,9.3,9.4, 10.1,10.2


Learning Resources

Prescribed Texts


Will be provided in class.

Other Resources

Notes are uploaded on the blackboard.  Handouts are distributed during class on a need basis.  Handouts distributed during class are not uploaded on the blackboard.

Overview of Assessment

Assessment are conducted in both theoretical and practical aspects of the course according to the performance criteria set out in the National Training Package. Students are required to undertake summative assessments that bring together knowledge and skills. To successfully complete this course you will be required to demonstrate competency in each assessment tasks detailed under the Assessment Task Section.

Your assessment for this course will be marked using the following table:

NYC (<50%) Not Yet Competent

CAG (50-59%) Competent - Pass

CC (60-69%) Competent - Credit

CDI (70-79%) Competent - Distinction

CHD (80-100%) Competent - High Distinction

Assessment Tasks

The assessment of this course will involve completion of:
Class Activity 5%
Test, 30%
Minor Project - Part A 30%
Minor Project-Part B 35%


Assessment Matrix

 CIVE5692 Element & Performance Criteria                   
class activity x                   
Test  x x x x x x x            
Minor Project-Part A         x x x x x x x x x x x x
Minor Project-Part B                    


 CIVE5692 Element & Performance Criteria                  
Assessment 6.1 6.26.3 6.4 6.5 6.6  6.76.8  6.96.10  6.11 6.126.13  6.146.15 6.16  7.1 7.2 7.3
class activity                   
Minor Project Part A                   
Minor Project Part B x x x x x x x x x x x x x x x x x x x

 CIVE5692 Element & Performance Criteria                  
Assessment 7.4 7.5 7.6 7.7 7.87.9  7.10 8.1 8.28.3  8.4 8.58.6  8.78.8  8.9 8.108.11  8.128.13
class activity                    
Minor Project-Part A                    
 Minor Project-Part B x x x x x x x x x x x x x x x x x x x x


 CIVE5692 Element & Performance Criteria
class activity     
Minor Project Part A     
Minor Project Part B xxxxx


Other Information

 Student directed hours involve completing activities such as reading online resources, project work, individual student-teacher course-related consultation. Students are required to self-study the learning materials and complete the assigned out of class activities for the scheduled non-teaching hours. The estimated time is 20 hours outside the class time.

Study and Learning Support:

The Study and Learning Centre (SLC) provides free learning and academic development advice to all RMIT students.
Services offered by SLC to support numeracy and literacy skills are:

* Assignment writing, thesis writing and study skills advice
* Maths and science developmental support and advice
* English language development

Please refer to find more information

Disability Liaison Unit:

If you have a disability or long-term medical condition you should contact the DLU to seek advice and support.

Please refer to to find more information about their services

Late submission:

If you require an extension for 7 calendar days or less (from the original due date) you must complete and lodge an Application for Extension of Submittable Work (7 Calendar Days or less) form and lodge it with the Senior Educator/ Program Manager.
The application must be lodged no later than one working day before the official due date. You will be notified within no more than 2 working days of the date of lodgment as to whether the extension has been granted.

If you require an extension of more than 7 calendar days (from the original due date) you must lodge an Application for Special Consideration form under the provisions of the Special Consideration Policy, preferably prior to, but no later than 2 working days after the official due date.

Assignments submitted late without approval of an extension will not be accepted nor marked.

Special consideration:

Please refer to 


Plagiarism is a form of cheating and it is a very serious academic offence that may lead to expulsion from the University.

Please refer to to find more information.

Other Information:

All email communications will be sent to your RMIT email address and it is recommended that you check it regularly. 



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