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Combined Approved Plans RAL21/0003
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The purpose of this report is to evaluate and design a suitable on-site treatment system and disposal
area in accordance with AS 1547 – 2012, the Queensland Plumbing and Wastewater Code and the
Plumbing and Drainage Act. The report relates exclusively to the above site and the proposed and or
existing buildings shown on the plan only. All measurements and levels shown are as accurate as
possible with the information provided these are to be used for locating the onsite effluent disposal
system only.
Site Description
Weather Conditions Fine
Slope 5-20%
Slope Stability N/a
Vegetation Heavily Grassed
Fill Nil
Flooding Nil
Watercourses Nil
Site exposure Sun & wind
Salinity Nil
Surface condition Nil cracks, seepage or compaction
Boulders & Rock outcrops Nil
Will water from uphill traverse the area No
Water table Nil
Soil Category (AS1547-2012 Table M1)
Borehole 0-0.2m 0.2m-0.6m
BH3-BH5 Cat 4 Cat 5
Clay Loams Light Clays
Weakly Structured Moderately Structured
0.12-0.5m/d 0.06-12m/d
Recommended Design Irrigation Rate
Test Result 0.10
Recommended Design Irrigation Rate 3mm/day
Adopted Rate 3/mm/day
Calculations
Bedrooms 4
Persons 6
DIR (mm/day) 3
Litres per person per day (Tank supply) 120
Calculations 6x120=720 /3= 240
Disposal Area Required 240m2 Covered surface pressure
compensating irrigation
Document Set ID: 21426326
Version: 1, Version Date: 24/03/2021
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