C6361-22-ENG - Feb 2023 - V1

 

 

 

 

 

 

 

 

LEGEND
7
ih [ SUBJECT SITE
‘ CMT 1 CATCHMENT LABEL
> , 99.908Ha
‘ HHS
y ‘ LN == imi mm EXISTING CATCHMENT BOUNDARY
x 1
} \ > —>-— __ STORMWATER FLOWPATH
DISCHARGE CALCULATIONS
SCENARIO CATCHMENT | CATCHMENT | FRACTION TIME OF iio} cio] Fy| cy] ly | 1% AEP
AREA | IMPERVIOUS | CONCENTRATION DISCHARGE | FLOW DEPTH
(Ha) (%) (min) (mm) (mm) (m*is) (m)
PRE-DEVELOPED cMT1 99.908 27 48 65.2 | 0.666] 1.2 |0.80] 110} 24.425 4.2208
POST-DEVELOPED CMT 1 99,908 28 48 65.2 | 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

CAPACITY @ FLOW DEPTH = 24.425m*/s
CAPACITY @ MAX DEPTH = 47.53m*/s

 

 

 

NN, V=0.73m/s
MAX WATER DEPTH = 1.2208m (1% AEP)
CATCHMENT 1 OVERLAND FLOW PATH SECTION - PRE-DEVELOPED
Scale 1:100 @A1 OVERLAND FLOW CAPACITY CALCULATIONS
Q100 OVERLAND FLOW
GULLY LONGITUDINAL GRADE = 2.0%
MANNING'S EQN

FLOW AREA = 33.591m?

WETTED PERIMETER = 49.571m
ROUGHNESS = 0.15

FLOW DEPTH = 1.2210m

CAPACITY @ FLOW DEPTH = 24.433m*/s

\ = 3
MAX WATER DEPTH = 1.2210m (1% AEP) vo. ne @ MAX DEPTH = 47.S3nrs

_\ CATCHMENT 1 OVERLAND FLOW PATH SECTION - POST-DEVELOPED
YT Scale 1:100 @ A1 0 50 100 150 200 250m
el

SCALE 1:2500 A1, 15000 A3

 

 

 

 

 

 

 

 

 

     

 

   

 

 

 

 

 

REV | DATE DESCRIPTION BY | CHKD PROJECT: DRAWING TITLE:
> o7 Saas aaaa R Yecoore SUT REHSEO LOT few [we PROPOSED RESIDENTIAL SUBDIVISION PRELIMINARY STORMWATER WALSH
E engineers@walshengnetau = (<a (ae! | cee eee at 7 TRILLER COURT, POMONA CATCHMENT PLAN CONSULTING
DIRECTOR APPROVAL 5
W walsheng.net.au wea 4665, | for LOVE POMONA PTY LTD SHEET 1 ENGINEERS
CONSULTING J 4 15/72 Wises Road, Maroochydore Q 4558
PO Box 5512, Maroochydore BC Q 4558 © This pianis Copyright Other than forthe purposes of and subjec to the conditions prescribed under the Copycght Act,n¢ | DRAWING No: REVISION
ENGINEERS | aan. 396i1 482716 FOR APPROVAL ayn ante ob ay mens ecto, neni miro roto cnyn. ectdnger he e: €6361/22/P07 A
NOT FOR CONSTRUCTION ‘oduced, stored ina retrieval system or transmitted without the prior written permission of Welsh Consulting Engingers ll
FILENAME : 0596-20 PO7 dg -DATE: 1220 -AGpm Al Sheet Size [ Design: Mvc Drawn BWM _ [Date: MAY 2022 ectual property remains within Walsh Consulting Enginee, Al enquiries shouldbe directed to Walsh Consulting Engineers, J COUNCIL REFERENCE: SHEET: 7 of 8