Detailed Model Simulation Results for Proposed Situation

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1 APPENDIX C Detailed Model Simulation Results for Proposed Situation Status Issue 2 Page 89 January 2013

2 Figure C-1 to C-15 complement the tabulated peak flood level and discharge predictions in Tables 4-3 and 4-4 (Section 4) for the proposed situation in the Mangapouri Stream and the unnamed watercourse draining the Racecourse Catchment. Figures C-1 to C-7 show water level hydrographs for selected flood cases above at the following locations: upstream of the old railway culvert on the Mangapouri Stream (Figure C-1) upstream of the new Expressway culvert on the Mangapouri Stream (Figure C-2) upstream of the existing SH1 culvert on the Mangapouri Stream (Figure C-3) within the remnant railway wetland area (Figure C-4) within the second wetland area (Figure C-5) upstream of the new Expressway / railway culvert on the unnamed watercourse draining the Racecourse Catchment (Figure C-6) Figure C-7 shows backwater profiles along the Mangapouri Stream for the same selected flood cases. Figures C-8 to C-14 show flood discharge hydrographs at: the old railway culvert on the Mangapouri Stream (Figure C-8) the existing SH1 culvert on the Mangapouri Stream (Figure C-9) total Rahui Road outflow overflow plus relief culvert outflow (Figure C-10) the remnant railway wetland outlet culvert (Figure C-11) the outlet culvert from the second wetland (Figure C-12) the new Expressway / railway culvert on the unnamed watercourse draining the Racecourse Catchment (Figure C-13) Status Issue 2 Page 90 January 2013

3 15.1 WL U/S Existing Railway Culvert - Proposed Situation Water Level :00:00 02:00:00 04:00:00 06:00:00 08:00:00 10:00:00 12:00:00 14:00:00 16:00:00 18:00:00 20:00:00 22:00:00 00:00:00 02:00:00 04:00:00 06:00:00 08:00:00 10:00:00 Figure C-1 Water level hydrographs for 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods upstream of old railway embankment on Mangapouri Stream WL u/s of Expressway Culvert - Proposed Situation Water Level 13.9 CC Figure C-2 Water level hydrographs for 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods in front of proposed Expressway culvert on Mangapouri Stream Status Issue 2 Page 91 January 2013

4 WL u/s SH1 - Proposed Situation Water Level CC :00:00 16:00:00 18:00:00 20:00:00 02:00:00 04:00:00 06:00:00 08:00:00 10:00:00 12:00:00 14:00:00 22:00:00 00:00:00 02:00:00 04:00:00 06:00:00 08:00:00 10:00:00 Figure C-3 Water level hydrographs for 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods upstream of SH1 culvert on Mangapouri Stream 19.8 WL within remnant railway wetland area - Proposed Situation Water Level CC Figure C-4 Water level hydrographs for 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods in remnant railway wetland area Status Issue 2 Page 92 January 2013

5 15.2 WL within the secondary wetland area - Proposed Situation Water Level 15.1 CC Figure C-5 Water level hydrographs for 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods in second railway wetland area for the proposed situation 15.1 WL u/s of the new expressway/railway culvert 'Race Cource Catchment' stream - Proposed Situation Water Level CC :00:00 02:00:00 04:00:00 06:00:00 08:00:00 10:00:00 12:00:00 14:00:00 16:00:00 18:00:00 20:00:00 22:00:00 00:00:00 02:00:00 04:00:00 06:00:00 08:00:00 10:00:00 Figure C-6 Water level hydrographs for 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods upstream of the new Expressway / railway culvert on the unnamed watercourse draining the Racecourse Catchment (Figure C-6) Status Issue 2 Page 93 January 2013

6 NZ Transport Agency Maximum 15.2 CC MANGAPOURI MANGAPOURI MANGAPOURI MANGAPOURI [m] Figure C-7 Backwater profiles along the Mangapouri Stream for the 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods [m^3/s] 4.6 Discharge through old railway culvert - Proposed Situation Discharge CC Figure C-8 Discharge hydrographs for the old railway culvert on the Mangapouri Stream for the 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods Status Issue 2 Page 94 January 2013

7 [m^3/s] 6.5 Discharge - Existing SH1 Culvert/Overflow - Proposed Situation Discharge CC Figure C-9 Discharge hydrographs for the existing SH1 culvert on the Mangapouri Stream for the 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods Figure C-10 Discharge hydrographs for the total Rahui Road outflow overflow plus relief culvert outflow for the 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods Status Issue 2 Page 95 January 2013

8 [m^3/s] 2.7 Discharge thorugh remnant wetland outlet culvert - Proposed Situation Discharge 2.6 CC Figure C-11 Discharge hydrographs for the remnant railway wetland outlet culvert for the 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods [m^3/s] 2.5 Discharge through outlet culvert from secondary wetland area - Proposed Situation Discharge CC Figure C-12 Discharge hydrographs for the outlet culvert from the second wetland for the 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods Status Issue 2 Page 96 January 2013

9 [m^3/s] 1.9 Discharge through the new expressway 'Racecourse Catchment' culvert - Proposed Situation Discharge CC Figure C-13 Discharge hydrographs for the new Expressway / railway culvert on the unnamed watercourse draining the Racecourse Catchment for the 1% AEP, 1% AEP + CC, 0.5% AEP + CC and 0.2% AEP + CC floods Status Issue 2 Page 97 January 2013

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