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Appendix B - Engineering Plans
Plans and drawings: the text below has words only, no drawings.
LINDSAY CONSULTING PTY
LTD
PROPOSED 1m HIGH BOUNDARY RETAINING WALL
GARDEN
PROPOSED 0.8m HIGH BOUNDARY RETAINING WALL
UNIT 1
POOL
150sqm
Driveway
Catchment
385sqm
Roof
Catchment
POOL
UNIT 2
FFL 2.750
GARDEN
PROPOSED 1m HIGH BOUNDARY RETAINING WALL
EXTERNAL IMPERVIOUS
AREAS - 80sqm
ALL PIPES TO BE uPVC CLASS SN10 AS1260 MIN
STORMWATER CALCULATIONS
STORMWATER CALCULATIONS
SITE AREA - 810sqm
TOTAL CATCHMENT AREA - 615 sqm
FLOW PATH LENGTH - 40 m
METAL SHEET ROOF
SURFACE RUNOFF COEFFICIENT - 0.013
SLOPE - 3% MIN
CALCULATED TRAVEL TIME - 5 MIN - QUDM TABLE 4.6.3
CRITICAL TIME OF CONCENTRATION - 5 minutes
I20 -259.0 mm/hr (Intensity for 20 year 5 minute Storm)
UNDEVELOPED SITE FRACTION IMPERVIOUS - 0.50
DEVELOPED SITE FRACTION IMPERVIOUS - 0.75
I10 - 74.5 mm/hr
C10 - 0.85 - QUDM TABLE 4.5.3
F20 - 1.15 - QUDM TABLE 4.5.2
Cy - 0.978 - C10 * F20
TOTAL FLOW RATE - 0.045 cbm/sec - (Area * I20 * Cy) = 45 Litres / Second
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