7/30/2019 RIICC531A Assignment 2011

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RIICWD531A TAFE NSW Riverina Institute 2011 Version 1 1

TAFENSWRIVERINA INSTITUTE

LEETON CAMPUS

Certificate IV in Civil Construction Design

(RII40809)

ASSESSMENT SUBMISSION

STUDENT NAME (please print) GRADED RESULT

................................................................................................ DISTINCTION 83% & Above

Date Due: 20th

November2011. CREDIT 70% & Above

Date submitted: ...................................................................... PASS 50% & Above

Module number or name: RIICWD531A ................................

Assignment number: .................1 ...........................................

STUDENT DECLARATIONIn submitting this assignment I am confirming that the work submitted is my own work. If this work is part of a workreport then a signed note from your supervisor is attached to confirm that the greater part of this work is my own.

If you worked on this assignment in collaboration with other students, please list the names of the contributingstudents below

..Please note, penalties may apply if it is evident that the work submitted is not your own

TEACHERS COMMENTS AND MARKS

...

...

TOTAL MARK:...Date forwarded to Teacher:

Date returned from Teacher:

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RIICWD531A TAFE NSW Riverina Institute 2011 Version 1 2

RIICWD531A- Prepare detailed design of subsurface drainage

Marks for the unit are derived from:Assignment 1 Subsurface drainage 100 marksAssignment 1 Surface drainage Q7 and Q8 45 / 2 marks

Assignment 2 Surface drainage Q1 and 2 110 / 2 marks

Assignment 1 RIICWD531A- Prepare detailed design ofsubsurface drainage

Mark: 100.

Please show all steps in your answers. This should include calculations, references,

tables, figures and assumptions. Marks are given for correct answers, correctworkings and for clear and professional setting out of assignment questions.

Question 1 (20 Marks)

a) Explain the movement of water by capillary forces. [ 4 ]

b) What is seepage. [ 2 ]

c) Explain the difference between pavement drains and cut-off drains [ 2 ]

d) Sketch a 2 stage pavement drain [ 4 ]

e) Why is a filter placed in subsurface drain structure ? [ 4 ]

f) Where should the subsurface drainage be in relation to surface drainage

structures ? and Why ? [ 4 ]

Question 2 (45 Marks)

a) Two vertical subsurface drains (one on either side) are to be placed underneath a

section of road which has been damaged due to the pavements proximity to the

current water table. Estimate the optimum depth to place the vertical subsurfacedrain pipes based on the design criteria listed below.

Spacing of drains = 21m

Water table depth RL=48.35

Lowered water table RL=47.05

Impervious confining layer RL= 39.1

Drainable pore space =0.03

Saturated permeability = 9*10-5 cm/s

Time = 7 days [20]

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RIICWD531A TAFE NSW Riverina Institute 2011 Version 1 3

b) Include a fully labelled subsurface cross-section diagram for part a) [5]

c) The value of the saturated permeability has a significant effect on the schilfgaarde

methodology/calculations. Discuss the effect in relation to a) the schilfgaardeequation and b) the connection between permeability and groundwater movement.

[10]

d) The value of the drainable pore space has a significant effect on the schilfgaarde

methodology/calculations. Explain what drainable pore space is a measure of and

discuss the effect in relation to a) the schilfgaarde equation and b) the connection

between drainable pore space and groundwater movement. [10]

Question 3 (35 Marks)

This question requires you to report on the subsurface drainage of a project

from your workplace. Eg: a road upgrade.

To prepare the report you will need to carry out some research and

preferably visit the project site.

Supplement your report with appropriate photographs, diagrams, sketches

and supporting documentation.

Your report should address the following topics:a) Briefly state the nature and purpose of the engineering project [5]

b) Detail the subsurface drainage design requirements. Please do not state the

project requirements. Instead state specific design criteria that relates direct

with the choice of subsurface structures and the positioning. [10]

c) Take one aspect of the design [ eg: type of drain(s) style chosen or precise

location of drain(s) etc ] and

i) Demonstrate or explain why this was chosen for the design [10]

ii) What alternatives could have been considered and why

werent these appropriate? [10]