Appendix C - Engineering Report

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LEGEND

[ SUBJECT SITE

CMT 1 CATCHMENT LABEL

99.908Ha

>>

EXISTING CATCHMENT BOUNDARY
STORMWATER FLOWPATH

DISCHARGE CALCULATIONS

 

SCENARIO CATCHMENT | CATCHMENT
AREA

(Ha)

FRACTION
IMPERVIOUS.

TIME OF
CONCENTRATION
(%) (min) (

1% AEP
DISCHARGE | FLOW DEPTH
(m*s) (m)

ito | cto} Fy} cy} ly

(mm)

 

PRE-DEVELOPED CMT 1 99.908

27 48

0.666} 1.2 | 0.80] 110 24.425 1.2208

 

 

 

 

POST-DEVELOPED CMT 1 99.908

 

28 48

 

 

0.667) 1.2 | 0.80] 110 24.434 4.2210

 

 

 

 

 

 

 

 

REFERENCE - CHAPTER 4 of QUDM - RATIONAL METHOD

OVERLAND FLOW CAPACITY CALCULATIONS
Q100 OVERLAND FLOW

GULLY LONGITUDINAL GRADE = 2.0%
MANNING'S EQN

FLOW AREA = 35.581m?

WETTED PERIMETER = 49.559m
ROUGHNESS = 0.15

FLOW DEPTH = 1.2208m

 

Nx WATER DEPTH = 1.2208m (1% AEP)

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

CAPACITY @ FLOW DEPTH = 24.425m"/s
CAPACITY @ MAX DEPTH = 47.53m"/s
V=0.73m/s

OVERLAND FLOW CAPACITY CALCULATIONS.
Q100 OVERLAND FLOW

GULLY LONGITUDINAL GRADE = 2.0%
MANNING'S EQN

FLOW AREA = 33.591m?

WETTED PERIMETER = 49.571m

 

\ we WATER DEPTH = 1.2210m (1% AEP)

_\ CATCHMENT 1 OVERLAND FLOW PATH SECTION - POST-DEVELOPED

YT Scale 1:100 @ At

ROUGHNESS = 0.15

FLOW DEPTH = 1.2210m

CAPACITY @ FLOW DEPTH = 24.433m"/s
CAPACITY @ MAX DEPTH = 47.53m‘/s
V=0.73m/s

0 50 100 150 200 250m

Ef

SCALE 1:2500 A1, 15000 A3

 

 

VWALSH

CONSULTING
ENGINEERS

P 075443 4443

E [email protected]

W walsheng,net.au

A 15/72 Wises Road, Maroochydore Q 4558
PO Box 5512, Maroochydore BC Q 4558
A.B.N. 39 611 482 716

Rev | DATE

DESCRIPTION

BY CHKD PROJECT:

 

 

 

PROPOSED RESIDENTIAL SUBDIVISION

 

 

DRAWING TITLE:

PRELIMINARY STORMWATER

YVALSH

 

 

     

 

   

 

 

 

FILENAME :C836'-22-PO7.dug- DATE : 20172 10:33am

 

to Walsh Consulting Engineers.

   

Al Sheet Sie [Design mvc [Drawn Bw [Date: MAY 2022 cual prozery remains within Wals Consulting Engineers. Al enquires shoud e di

 

 

 

 

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