wastewater design · MCU22/0192

3.0 DESIGN DETERMINATION

We have determined the soil to have the following characteristics

 

Soil Characteristics (AS/NZS 1547/2012)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Borehole Nos 4
Depth (mm) 0 - 200
Soil Category 4
Indicative Drainage Imperfect
Structure High
Texture Clay Loam
Indicative Permeability P (m/day) as Kgat 0.5 - 1.5
For our calculations we have assessed the design flow as follows
*Design calculations, PROPOSED CABINS
DIR (mm/day) (Advanced/Secondary quality effluent) 3.5
Hydraulic load (It/day/person) 120
Design flow Q (It/day) (equivalent population 6 people) 720
Design sizing calculation Ai=Q/DIR
= 720/3.5
Disposal Area Ai (m’) = 206

 

 

Fixed Low pressure heavy droplet ‘wobbler’ type (or such) spray irrigation system

 

 

*Design calculations, FUTURE SHED

 

 

 

 

 

 

 

 

 

 

DLR (mmi/day) (Primary quality effluent) 5-8
Hydraulic load (It/day/person) 120
Design flow Q (It/day) (equivalent population 4 people) 480
Design sizing calculation L=Q/DLRxW
480/8x1.0

W = Trench Width (m) 1.0

L = Trench Length (rounded up to next metre) 60

Trench depth (m) 0.4

Septic Tank minimum size requirement (It) 3000

 

 

 

 

Unearthed Geotechnical P/L. 3

Design Report 022-164