HSTP Design · MCU26/0104

Design Calculations

(The Disposal area is solely based upon the below calculation; no additional loads are to
be connected. Additional bedrooms, buildings or residents could result in failure)


 Number of Buildings                                                   1
 Number of Bedrooms                                                    4
 Number of Persons (Max)                                               6
 Adopted DIR                                                           3
 Litres per person per day (Tank supply)                              120
 Calculations                                                6x120 = 720/3=240
 Minimum Disposal Area Required                                 240sqm (min)
 Available Reserve area                                              100%



Type of Treatment
The site is to be provided with an approved (By Department of Housing and Public Works)
Advanced Secondary ASTP. The installer is to ensure the proposed final local of the
system provides sufficient fall and does not cause audible disturbance to nearby
residence.

Disposal Area & Treatment Requirements

The disposal area required is 240sqm (min).

The irrigation area is to consist of pressure compensating dripper lines buried 150-
200mm deep and spaced approximately 800mm apart.

The area is to be turfed or seeded post installation.

The installer is to ensure the HSTP is located at least 150mm above any flood levels.

The installer is to ensure the HSTP location does not cause damage to existing or
proposed footing systems, the HSTP should be anchored to prevent flotation.

All materials used are to be approved, fit for use and new. All pipework must be rated to
150% of the pump shut off.

The HSTP is to be fitted with a discharge filter with a suitable aperture, to prevent blocking
of the irrigation type installed. This should be accessible and cleaned regularly.

All stormwater from upslope is to be diverted area from the area.

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