Project:

Section:

Drawing Ref:

Reference:

Treatment Plant Design = 550 p.e.

= 225 l/p/day

Operating at Full Capacity = 123750 l/day

= 123.75 m3/day

= 5.15625 m3/hr

Volume of Storm Tank =

DWF 1 = 6 DWF 2 = 3

3 hours

Storage Tank Volume = 46.41 m3

5.15625 m3/hr

DWF = 3

2 hours

31 m3

Operating at Full Capacity =

Retention Time (hrs) =

Storage Tank Volume =

The existing sump measures 4.5 x 4.5 x 1.5 on site, giving

a volume of approximately 32.5 m3, therefore the

retention time in this sump exceeds a 2 hour retention

period, at 3DWF, prior to the emergency overflow to the

reed beds.

Retention Time =

(DWF 1 - DWF 2) x Retention Time

Sump Storage Tank Sizing

Avg. Flow per person per day

Using a design concept of providing storage for the

difference between 6 times DWF and 3 times DWF for a

period if 2 hours, we can say

Storm Tank Storage

Job No. :

Keadue WWTP Upgrade Works

Calculation Sheet No :

Storm & Sump Storage Tank Design

Calculations By: Checked By: Date:

Ken Geelan

Calculations Output

INSERT RELEVANT DATA INTO HIGHLIGHTED AREAS