Appendix C - Engineering Report

 

 

 

 

 

 

 

 

 

 

LEGEND

LJ

CMT 1
99.908Ha

SUBJECT SITE

CATCHMENT LABEL.

>>

EXISTING CATCHMENT BOUNDARY
STORMWATER FLOWPATH

DISCHARGE CALCULATIONS

 

SCENARIO CATCHMENT | CATCHMENT
AREA

(Ha)

AMT 1 ~~
99.908Ha

FRACTION
IMPERVIOUS

TIME OF
CONCENTRATION
(min)

io | cio} Fy] cy] ly | 1% AEP
DISCHARGE

(m*/s)

FLOW DEPTH

(%) (mm) (mm) (m)

 

PRE-DEVELOPED CMT 2 5.243

 

0 19 65.2 | 0.660} 1.2 |0.79) 178 2.05 0.779

 

POST-DEVELOPED CMT 2 5.243

 

 

 

 

6 19 65.2 | 0.675] 1.2 | 0.81) 178 2.10 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)

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

CAPACITY @ FLOW DEPTH = 2.10m%/s
CAPACITY @ MAX DEPTH = 11.61m*/s
V=0.79m/s

Nx WATER DEPTH = 0.788m (1% AEP)

B \ CATCHMENT 2 OVERLAND FLOW PATH SECTION - POST-DEVELOPED
- Scale 1:100 @ A1

 

0 20 40 60 80 100m

Ef

SCALE 1:1000 A1, 1:2000 A3

 

 

WALSH

CONSULTING
ENGINEERS

>emv

REV | DATE DESCRIPTION BY CHKD PROJECT:

PROPOSED RESIDENTIAL SUBDIVISION
at 7 TRILLER COURT, POMONA
for | LOVE POMONA PTY LTD

 

07 5443 4443
[email protected]
walsheng.net.au

15/72 Wises Road, Maroochydore Q 4558

DIRECTOR APPROVAL
RPEQ- 4665

 

 

DRAWING TITLE:

PRELIMINARY STORMWATER
CATCHMENT PLAN

SHEET 2

YVALSH

CONSULTING
ENGINEERS

 

PO Box 5512, Maroochydore BC Q 4558
A.B.N. 39 611 482 716

 

FOR APPROVAL

This plan is Copyright. Other than forthe purposes of and su
of it may in ay form or by any means (electronic, mechani

      

DRAWING No: C6361/22/P08

REVISION

 

NOT FOR CONSTRUCTION
[Drawn:BwmM — [Date: may 2022

 

 

 

 
 

  

a system or transmitted without the te
is within Walsh Consulting Engineers, all enquiies should be directed to Wels

 

 

 

FILENAME : 0596-2208 dug -DATE 205122 1035am Al Sheet Size J Design: MVC

 

 

 

 

COUNCIL REFERENCE: SHEET: 8 of 8