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MCU14/0056 Stormwater Quantity Management Plan Att D Information response
Plans and drawings
This document appears to be plans or drawings. Its page text below holds only the words printed on the drawings, without the drawings themselves, so it may be jumbled or hard to follow. To see the plans as drawn, choose Original above or download the file (both need you to log in).
Log in to see the plans as drawn5.2 Developed Scenario Model Setup
The existing model was modified to include the development. Buildings were input as a
blocked obstruction. A retaining wall was assumed along the RP boundary on the eastern
side of the development site. The future development area was assumed to be constructed at
an elevation of 108.0m AHD.
A comparison between the existing and developed HECRAS scenario results is presented in
Tables 5.2, 5.3, 5.4, 5.5, 5.6 and 5.7 below.
Table 5.2 – Q100 HECRAS Results Comparison
Proposed Developed
Existing Inundation Level Increase
XS Inundation Level
m AHD m
m AHD
70 107.941 107.937 -0.004
60 107.940 107.935 -0.005
50 107.846 107.841 -0.005
40 107.687 107.681 -0.006
30 107.492 107.483 -0.009
20 107.443 107.439 -0.004
5 106.807 106.806 -0.001
1 106.705 106.704 -0.001
-5 106.413 106.411 -0.002
-10 106.397 106.395 -0.002
-15 106.383 106.381 -0.002
Table 5.3 – Q50 HECRAS Results Comparison
Proposed Developed
Existing Inundation Level Increase
XS Inundation Level
m AHD m
m AHD
70 107.654 107.652 -0.002
60 107.657 107.655 -0.002
50 107.561 107.558 -0.003
40 107.396 107.393 -0.003
30 107.123 107.115 -0.008
20 107.043 107.042 -0.001
5 106.606 106.605 -0.001
1 106.496 106.495 -0.001
-5 106.122 106.121 -0.001
-10 106.102 106.101 -0.001
J4279 Report 1.0.doc
14 January 2015 Page 11
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