C6361-22-ENG - Feb 2023 - V1

 

LEGEND

[ SUBJECT SITE

CMT 1 CATCHMENT LABEL
99.908Ha

== imi mm EXISTING CATCHMENT BOUNDARY

> —>-— __ STORMWATER FLOWPATH

 

 

 

 

 

 

 

 

DISCHARGE CALCULATIONS

 

 

 

 

 

’
¢
CMT 1 _- SCENARIO CATCHMENT | CATCHMENT | FRACTION TIME OF 10} cto] Fy| cy] ly | 1% AEP
/ a AREA | IMPERVIOUS | CONCENTRATION DISCHARGE | FLOW DEPTH
/99.908Ha (Ha) (%) (min) (mm) (mm) | (m/s) (m)
/
/
PRE-DEVELOPED CMT 2 5.243 0 19 65.2 0.660] 12 |079] 178) 205 0.779
a POST-DEVELOPED | CMT 2 5.243 6 19 65.2 |0.675] 12 081] 178] 210 0.788

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REFERENCE - CHAPTER 4 of QUDM - RATIONAL METHOD

OVERLAND FLOW CAPACITY CALCULATIONS,
Q100 OVERLAND FLOW

GULLY LONGITUDINAL GRADE = 4.0%
MANNING'S EQN

FLOW AREA = 2.605m?

WETTED PERIMETER = 5.752m

ROUGHNESS = 0.15

FLOW DEPTH = 0.779m

CAPACITY @ FLOW DEPTH = 2.05m‘/s
CAPACITY @ MAX DEPTH = 11.61m*/s

V=0.79m/s
MAX WATER DEPTH = 0.779m (1% AEP)

cP) CATCHMENT 2 OVERLAND FLOW PATH SECTION - PRE-DEVELOPED
Scale 1:100 @ A1

OVERLAND FLOW CAPACITY CALCULATIONS:
Q100 OVERLAND FLOW

GULLY LONGITUDINAL GRADE = 4.0%
MANNING'S EQN

FLOW AREA = 2.655m?

WETTED PERIMETER = 5.797m

ROUGHNESS = 0.15

 

 

 

 

 

 

 

 

   
      

 

 

 

 

 
 

   

 

FLOW DEPTH = 0.788m NN.
CAPACITY @ FLOW DEPTH = 2.10m%s MAX WATER DEPTH = 0.788m (1% AEP)
Weare MXDERTH= 1161mis B \ CATCHMENT 2 OVERLAND FLOW PATH SECTION - POST-DEVELOPED
, - Scale 1:100 @ A1 0 20 40 60 80 100m
|
SCALE 1:1000 At, 1:2000 A3
REV DATE DESCRIPTION BY HKD, PROJECT: DRAWING TITLE:
> orsaa3 aaca + [osrans | avenosoTosur evarowwour ww [one PROPOSED RESIDENTIAL SUBDIVISION PRELIMINARY STORMWATER WALSH
VVALSH E [email protected] = ff tt cette at 7 TRILLER COURT, POMONA CATCHMENT PLAN CONSULTING
Ww Ishi at. DIRECTOR APPROVAL, ~
CONSULTING | 4 15/72 Wises Road, Maroochydore 0.4558 rca 4605 | for | LOVE POMONA PTY LTD SHEET 2
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FILENAME : 08361-22-P08.dug DATE : 72723 18pm Al Sheet Size J Design: Mvc_—_[Drawn: BWM ___[Date: MAY 2022