EagFirRsp

The pre- and post-development water levels are summarised in Table 9 on the following page, and the pre- and
post-development flow rates are summarised in Table 10. With the basin in place, mitigation is practically
complete. There remains only a 0.04 m3/sec increase in the 5 year flow rate, but this increase is so small that it
is not reflected in the water levels (to the nearest 0.01 metre) and is therefore of no consequence.

Nett Result: Practically complete mitigation; with minor benefits in most storms but a remaining disbenefit of
no real consequence in the 5 year storm.

Table 9: Water Levels At Node N2, Approaching Caravan Park
 Event                Pre-Development     Post Development
 AEP (ARI)             EL (m)               EL (m)
 AEP 1% (100 yr)       2.04                 2.03
 AEP 2% (50 yr)        1.99                 1.98
 AEP 5% (20 yr)        1.94                 1.93
 AEP 10% (10 yr)       1.84                 1.84
 AEP 20% (5 yr)        1.79                 1.79
 AEP 50% (2 yr)        1.65                 1.64
 AEP 67% (1yr)         1.61                 1.60

Table 10: Flow Rates From Node N2 to N3, Approaching Caravan Park
 Event                Pre-Development     Post Development
 AEP (ARI)            (m3/s)               (m3/s)
 AEP 1% (100 yr)      6.78                  6.66
 AEP 2% (50 yr)       5.98                  5.79
 AEP 5% (20 yr)       4.98                  4.86
 AEP 10% (10 yr)      4.09                 4.08
 AEP 20% (5 yr)       3.62                  3.66
 AEP 50% (2 yr)       3.01                  2.97
 AEP 67% (1yr)        2.70                  2.63




Please do not hesitate to contact me if you require clarification of this advice. In the meantime, I remain,

Yours faithfully,




Denis Ogle, RPEQ 2405, Director.




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BSM Doc File EagFirResp.Doc