BEFORE THE TASMAN DISTRICT COUNCIL
IN THE MATTER of clause 21 of the Resource Management Act 1991
AND
IN THE MATTER of a private plan change request by Foodstuffs (South Island) Properties Limited to the Tasman Resource Management Plan:
Three Brothers Corner Commercial Zone, Richmond (PC49)
STATEMENT OF REBUTTAL EVIDENCE OF DAVID PATRICK WILSON
26 November 2013
______________________________________________________________
______________________________________________________________
ANDERSON LLOYD LAWYERS
CHRISTCHURCH Solicitor: J M Crawford
18a Birmingham Drive Middleton
PO Box 13831 Christchurch 8141 New Zealand Tel 03 379 0037 Fax 03 379 0039
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1. INTRODUCTION
Qualifications and experience 1.1 My full name is David Patrick Wilson.
1.2 My qualifications and experience are set out in section one of my Statement of Evidence dated 29 October 3013.
1.3 I have read the Code of Conduct for Expert Witnesses contained in the Environment Court Practice Note and agree to comply with it. I confirm that this supplementary evidence is written within my area of expertise, except where otherwise stated, and that I have not omitted to consider material facts known to me that might alter or detract from the opinions expressed.
2. RESPONSE TO SUPPLEMENTARY EVIDENCE OF MR LEY 2.1 In this brief, I have replied to matters raised by Mr Dugald Ley in his
supplementary evidence titled "Information and Comment from Hearing the Applicant's Evidence".
Paragraph 4
2.2 I understand that the proposed upstream diversion is programed for 2025 and that there are no improvements proposed within 200m of the culvert outlet. Therefore the culvert will remain outlet controlled for the foreseeable future.
Paragraph 7
2.3 At paragraph 7 Mr Ley refers to discussions had with Council Hydrologists, and makes the statement that the peak one hour rainfall intensity during the December 2011 storm was only 14 mm/hr which is less than an annual event. From this he infers that the photographs show the stream was not coping under this less than annual event.
Having analysed the December 2011 rainfall information provided to me by Tasman District Council Hydrologist Matt McLarin on 2 October 2013 (attached), I note that the event occurred over three days and the rainfall total that fell on the catchment was greater than the 1%
AEP event.
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2.4 The photo Mr Ley attached to his statement was taken around 19:30 on 14 December 2011 (approximately 26 hours through the December 2011 event). The total rainfall for the previous 24 hours was 201 mm, which is greater than the 191mm predicted for a 1% AEP event. It is my opinion that this shows the catchment was responding to a significantly larger event than the annual event and the observed water levels shown are not as a result of a less than annual event.
2.5 I understand that during the December 2011 event, throughout Richmond upstream water ways became blocked with debris and slips, which I believe may have resulted in storm water runoff discharging in unexpected directions. So although Mr Ley is correct in saying that the peak one hour rainfall intensity for the December 2011 event was 14 mm/hr, it is not valid to say the resulting water levels are a less than annual event.
2.6 As per paragraph 5.16 of my evidence, I can confirm that the hydraulic modelling of the water levels in the drain ignores any benefit of the attenuation provided by the proposed rain gardens. The hydraulic model conservatively assumed that the rain gardens would be full.
Paragraphs 8-12
2.7 Details of the outfall configuration and alignment will be provided with any future Discharge Consent Application.
Paragraph 13
2.8 None of the analysis completed to date would indicate any benefit in having the outfall from the site downstream of the culvert outlet.
2.9 Regardless this matter would have to be considered in any Resource Consent application as Tasman Resource Management Plan rule 36.4.2.3 (4) states that Council has restricted the exercise of its discretion to (amongst other matters) the nature, design and location of outlet structures.
David Patrick Wilson 26 November 2013
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Richmond at Tasman District Council Office
Rainfall Duration Curves October 2013
29-06-2003
Source is \\TSrvFlosys\Flosys\Hydrology-Working.hts Rainfall (mm) at HY Richmond Weather at TDC Roof From 28-Jun-2003 00:00:00 to 1-Jul-2003 00:00:00
ARI 10 min 20 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
2 year 7.9 11.8 14.9 22.4 29.6 46 60.7 80.2 95.5 106
10 year 12.1 18.1 23 34.4 45.1 69 90.2 118.1 141 156
20 year 14.3 21.4 27.1 40.6 52.9 80.5 105 136.9 163 181
50 year 17.6 26.4 33.5 50.2 65.1 98.4 127.7 165.7 198 219
100 year 20.7 31 39.3 58.9 76.1 114.4 148 191.3 228 253
This data 6.7 12.3 17 24 31 40 62 101 143 147 150
26-05-2011
Source is Q:\Hydrology-Archive.hts
Rainfall (mm) at HY Richmond Weather at TDC Roof From 25-May-2011 00:00:00 to 27-May-2011 00:00:00
ARI 10 min 20 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
2 year 7.9 11.8 14.9 22.4 29.6 46 60.7 80.2 95.5 106
10 year 12.1 18.1 23 34.4 45.1 69 90.2 118.1 141 156
20 year 14.3 21.4 27.1 40.6 52.9 80.5 105 136.9 163 181
50 year 17.6 26.4 33.5 50.2 65.1 98.4 127.7 165.7 198 219
100 year 20.7 31 39.3 58.9 76.1 114.4 148 191.3 228 253
This data 4.5 8.5 10.5 15 19 24.5 43.5 64.5 67.5 81 81
14-12-2011
Source is Q:\Hydrology-Archive.hts
Rainfall (mm) at HY Richmond Weather at TDC Roof From 13-Dec-2011 00:00:00 to 16-Dec-2011 00:00:00
ARI 10 min 20 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
2 year 7.9 11.8 14.9 22.4 29.6 46 60.7 80.2 95.5 106
10 year 12.1 18.1 23 34.4 45.1 69 90.2 118.1 141 156
20 year 14.3 21.4 27.1 40.6 52.9 80.5 105 136.9 163 181
50 year 17.6 26.4 33.5 50.2 65.1 98.4 127.7 165.7 198 219
100 year 20.7 31 39.3 58.9 76.1 114.4 148 191.3 228 253
This data 3.0 5.5 7.5 14.0 25.5 38.5 72.0 125.0 205.5 280.5 284.0
18-06-2012
Source is \\TSrvFlosys\Flosys\Hydrology-Working.hts Rainfall (mm) at HY Richmond Weather at TDC Roof From 17-Jun-2012 00:00:00 to 20-Jun-2012 00:00:00
ARI 10 min 20 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
2 year 7.9 11.8 14.9 22.4 29.6 46 60.7 80.2 95.5 106
10 year 12.1 18.1 23 34.4 45.1 69 90.2 118.1 141 156
20 year 14.3 21.4 27.1 40.6 52.9 80.5 105 136.9 163 181
50 year 17.6 26.4 33.5 50.2 65.1 98.4 127.7 165.7 198 219
100 year 20.7 31 39.3 58.9 76.1 114.4 148 191.3 228 253
This data 6.4 10.3 10.8 19.6 27.4 35.8 48.5 61.7 82.3 118.6 124.4
15-01-2013
Source is \\TSrvFlosys\Flosys\Hydrology-Working.hts Rainfall (mm) at HY Richmond Weather at TDC Roof From 14-Jan-2013 00:00:00 to 17-Jan-2013 00:00:00
ARI 10 min 20 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
2 year 7.9 11.8 14.9 22.4 29.6 46 60.7 80.2 95.5 106
10 year 12.1 18.1 23 34.4 45.1 69 90.2 118.1 141 156
20 year 14.3 21.4 27.1 40.6 52.9 80.5 105 136.9 163 181
50 year 17.6 26.4 33.5 50.2 65.1 98.4 127.7 165.7 198 219
100 year 20.7 31 39.3 58.9 76.1 114.4 148 191.3 228 253
This data 6 10.5 15.5 25 42 52 85.5 112 131 131 131.5
21-04-13
Source is W:\Hydrology-Working.hts
Rainfall (mm) at HY Richmond Weather at TDC Roof From 21-Apr-2013 00:00:00 to 24-Apr-2013 00:00:00
ARI 10 min 20 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
2 year 7.9 11.8 14.9 22.4 29.6 46 60.7 80.2 95.5 106
10 year 12.1 18.1 23 34.4 45.1 69 90.2 118.1 141 156
20 year 14.3 21.4 27.1 40.6 52.9 80.5 105 136.9 163 181
50 year 17.6 26.4 33.5 50.2 65.1 98.4 127.7 165.7 198 219
100 year 20.7 31 39.3 58.9 76.1 114.4 148 191.3 228 253
This data 20.3 34.4 46.9 82.8 132.8 148.4 162.4 181.2 216.1 232.0 249.0
6 min 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300
Duration curve for Rainfall (mm) at HY Richmond Weather at TDC Roof From 28-Jun-2003 00:00:00 to 1-Jul-2003 00:00:00
2 year 10 year 20 year 50 year 100 year
6 min 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300
Duration curve for Rainfall (mm) at HY Richmond Weather at TDC Roof From 25-May-2011 00:00:00 to 28-May-2011 00:00:00
2 year 10 year 20 year 50 year 100 year
6 min 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300
Duration curve for Rainfall (mm) at HY Richmond Weather at TDC Roof From 13-Dec-2011 00:00:00 to 16-Dec-2012 00:00:00
2 year 10 year 20 year 50 year 100 year
6 min 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300
Duration curve for Rainfall (mm) at HY Richmond Weather at TDC Roof From 17-Jun-2012 00:00:00 to 20-Jun-2012 00:00:00
2 year 10 year 20 year 50 year 100 year
6 min 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300
Duration curve for Rainfall (mm) at HY Richmond Weather at TDC Roof From 14-Jan-2013 00:00:00 to 17-Jan-2013 00:00:00
2 year 10 year 20 year 50 year 100 year
6 min 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 1 day 2 day 3 day
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
Duration curve for Rainfall (mm) at HY Richmond Weather at TDC Roof From 21-Apr-2013 00:00:00 to 24-Apr-2013 00:00:00 2 year 10 year 20 year 50 year 100 year
