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Appendix E - Stormwater Management Plan
Attached to the e-mail Multiple Housing – Type 3 Retirement & Special Needs (10 units) - MCU17/0551.
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Log in to see the plans as drawnSouth Bioretention Basin
Critical Section
CROSS SECTION DETAILS 10% AEP 1% AEP
POINT CH Z n wA wP n x wA wA wP n x wA
1 ‐11.2 101.2 0.060
2 ‐11.2 101 0.060
3 ‐10 100.7 0.060 0.11 0.95 0.01 0.14 1.11 0.01
4 10 100.7 0.060 4.62 20.00 0.28 5.37 20.00 0.32
5 12 101.2 0.060 0.11 0.95 0.01 0.14 1.11 0.01
wA wP n x wA wA wP n x wA
TOTAL 4.833444 21.90487 0.290007 5.658369 22.21411 0.339502
S
0.005 R n Q R n Q
0.220656 0.060 2.08 0.25472 0.060 2.68
Flow 2.08 2.68
WSL 100.931 100.9685
Calculated by Manning's Equation 2.08 2.68
Vel (m/s) 0.43 0.47
Basin Section
101.4
101.2
101
Height (m AHD)
100.8
100.6
100.4
100.2
100
-15 -10 -5 0 5 10 15
Width (m)
Existing Sur face 10 % AEP 1% A EP
As indicated in the results above, velocity is below 0.5m/s during both the major and minor storm
events. The potential for scour or damage to vegetation is therefore low and below requirements
specified in WSUD Technical Design Guidelines (2006)
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