Course Title: Design underground piping and drainage systems and minor culberts

Part B: Course Detail

Teaching Period: Term1 2008

Course Code: CIVE5603

Course Title: Design underground piping and drainage systems and minor culberts

School: 130T Infra, Electrotec & Build Serv

Campus: City Campus

Program: C6066 - Advanced Diploma of Civil Engineering (Structural Design)

Course Contact : Tony Skinner Program Coordinator

Course Contact Phone: (03) 9925 4444

Course Contact Email:tony.skinner@rmit.edu.au


Name and Contact Details of All Other Relevant Staff

Program Coordinator:
Mr Tony Skinner
Tel. 9925 4444
Fax. 99254377
Email: tony.skinner@rmit.edu.au

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

EAC110 – Perform engineering hydrology activities
EAX101 – Perform calculations related to simple fluid systems
EDX130 – Use mathematics at technician level
EDX140 – Use quadratic, exponential, logarithmic and trigonometric function and matrices

Course Description

This unit covers the competency 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:

EAC100 Design underground piping and drainage systems and minor culberts

Element:

Apply the Rational Method to the calculation of peak discharge

Performance Criteria:

1.1 Calculations are carried out to determine the peak discharge for a use urban catchments (including grassed reserve), given the areas, uses, with runoff coefficients and overland and channel entry times.
1.2 Calculations are carried out to determine the weighted runoff and peak discharge for rural catchments, given the areas and coefficients.

Element:

Calculate pipe invert levels and grades

Performance Criteria:

2.1 The obvert at initial pit outlet H.G.L is located
2.2 The inlet is aligned at next pit with pit outlet calculated.
2.3 Minimum fall trough pit is provided
2.4 Pipe slope is checked and pipe levels adjusted is necessary to obvert below H.G.L. and minimum cover.

Element:

Calculate the design discharge

Performance Criteria:

-

Element:

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

Performance Criteria:

4.1 The obvert at initial pit outlet H.G.L is located
4.2 The inlet is aligned at next pit with pit outlet calculated.
4.3 Minimum fall trough pit is provided
4.4 Pipe slope is checked and pipe levels adjusted is necessary to obvert below H.G.L. and minimum cover.

Element:

Check system for overflow and modify where necessary.

Performance Criteria:

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

Element:

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

Performance Criteria:

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

Element:

Determine culvert size.

Performance Criteria:

7.1 Design data is assembled
7.2 Depth and velocity of discharge in natural waterway is determined
7.3 Tail water depth is derived
7.4 Culvert slope is selected to be compatible with site conditions
7.5 Culvert length is determined through embankment
7.6 Allowable headwater depth is set
7.7 Freeboard requirement is established
7.8 depth of flow is determined.
7.9 The Road Design Manual procedure and design charts are used to establish maximum headwater level.
7.10 Acceptability of headwater level, cover and outlet velocity is checked.
7.11 Culvert trial size is modified and recomputed as necessary.
7.12 Design data is recorded in a form suitable for production as a drawing, showing headwater level below pavement base course, required cover over culvert and non-scour velocity or adequate scour protection at outlet.

Element:

Determine the time of concentration and peak discharge.

Performance Criteria:

8.1 Roof and gutter time is used for house lots
8.2 Overland and gutter time is used for grassed and paved areas
8.3 Longest time is used for full area flow.
8.4 Impervious entry time is used for part area flow
8.5 Time in pipe to downstream pipe is estimated and time downstream from pit to pit summed.
8.6 The longest time at junctions is adopted
8.7 The rational method is used to calculate part area and full area discharge at each pit
8.8 The maximum flood discharge at critical points is calculated
8.9 The gap flow – overflow is determined at critical points
Overflow path at intersections, court bowls is considered.

Element:

Interpret the job brief and gather necessary information.

Performance Criteria:

9.1 Interpret the job brief and gather necessary information.

Element:

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

Performance Criteria:

10.1 Road drainage lines and pits are located
10.2 Entry pit spacing is determined based on flow spread and inlet capacity and lot discharge
10.3 Design charts are used and calculations carried out to determine runoff entry and bypass
10.4 An economical route is selected for road drainage to outlet
10.5 Junction pits are located at direction change and at maximum spacing
10.6 Road drainage network is reviewed and adjusted.
10.7 Blocks not served by road drainage are identified
10.8 Easement pits and inlets are located and connected by economical route to road drains
10.9 Minimum pipe sizes to be used in easements, road reserve and beneath pavement are established
10.10 The minimum cover is determined
10.11 The pipe lengths are determined
10.12 The catchment areas contributing to each outlet pipe are marked.
10.13 The catchment areas are divided into sub-area based on land use
10.14 The sub-areas entering gutter inlets are identified
10.15 The areas and coefficient of runoff for each sub-area are recorded.
The equivalent areas for each sub-area are calculated and summed for each outlet pipe.

Learning Outcomes


Apply the Rational Method to the calculation of peak discharge

Calculate pipe invert levels and grades

Calculate the design discharge

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

Check system for overflow and modify where necessary.

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

Determine culvert size.

Determine the time of concentration and peak discharge.

Interpret the job brief and gather necessary information.

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


Details of Learning Activities

Topics
Refer to underpinning knowledge and skills in the relevant descriptor contained in the curriculum document Attachment

Learning Activities
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

See Online Learning Hub for details.


Learning Resources

Prescribed Texts

No Prescribed text at this stage.


References

These will be given in class.


Other Resources


Overview of Assessment

This unit will be assessed in the classroom environment using holistic assessment based on typical workplace activities

Assessment of this unit will involve completion of
• Four minor assignments covering elements 1,2, 3 and 4
• Three major assignments covering Elements 5, 6, 7, 8, 9 and 10


Assessment Tasks

These will consist of two major assignments and one examination. The examination must be passed for student to successfully complete the course. (Pass percentage =50).


Assessment Matrix

Element Covered Assessment Task Proportion of Final Assessment Submission Date
1-5 Assign 1 30% April 13, 07
1-10  Assign 2+Exam 30%+40% June 15,07

Course Overview: Access Course Overview