A6880 - Eng - June 2024

Attenuation Tank Excel Model Results

 

 

 

 

 

 

INPUT
Rainfall Intensities (mm/hour) *
AEP 63.20% | 50% 10% 2% 1% |
5 minute storm 148.8 168 270 «358.8 = 397.2
10 minute storm 121.2 136.8 216 282 «309.6
30 minute storm 7248 8196 1308 1716 1896
60 minute storm 4812 5472 89.16 1201344
120 minute storm 312 35.76 60.12 834 93.72

 

 

 

* default intensities set for Maroochydore (from BOM)
* default temporal patterns set for East Coast (North) (from ARR)

Catchment Information (5 minute time of concentration)

Area (mM) Fraction Impervious | —Cio*
6096 0.80 x 0.86

6095 0.90 Y 0.88
0 o00 8 Oy 07

* C1 values derived from QUDM

Light cover bushland, or Poor grass cover, or toy |
= — Orifice & Weir Configuration
Low soil permeability v
nd

 

ion Tank I
Tank base width (m) = 5
Tank base length (m) = 29
Orifice flow discharge coeffecient C,= 0.62
Side wall slope = lind
* 1 in 0 slope indicates vertical walls OC

Tank Outlet Information

 

 

 

 

 

 

 

 

 

 

 

 

 

Orifice Number 1 2 3 4 a 6 Overflow Weir
Diameter (mm) 354 Length (mm) 2000
Invert level (mm) 0 Invert level (mm)]| 1400