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Ooohi 17527' Mongåkohio 46618'- Koihu 16611" ) Puketuruo 4óóóOl & Pukewoengo 4óóó2 (z' ,Woiwhiu a 45 702 ,Kouoerongo 93Oì a 7/ ¡woit- gtol Pìoko 9l08- Ohote 1143428- - - Pokoiwhenuo lO43419- - \ Te Tohi 1143427-. - Oteke 4ìó0'l1 \- & Purukohukohu 'l143408 -Woimono l55l I ,Woimono ì553ó /' / / Woioeko 15901 Popokuro 43803'- Woiroo 85Ol- - Woitongi 13602'- - - -Woiotopu 43172 -whirinok¡ l54lo --T - - -Woingoromiq ì97I - - -Whorekogoe l97O ,1',/ lO43¿59 rL Y- - - -Tongoriro :-- - .- --Tohekenui 2lóOl - --Wongonui -=ln --_-t 333¡7 - - -Mongolepopo 33324 - - Whokopopo 33320 It-L- \t- Mokotuku 33.l17 / Woipopo 4343* - Mongokowhoi 4O7O3- - Tohunootoro 1013128- - Mongokino 1C,13427-- - Ongorræ3331ó - - Mongoroo3334l--- Ohuro 333ì3- - - Tongorokou 333 I l- - Woitoro 39501 --; Mongonui 39504-- Mongonui 39508-- - Punehu3óOOl - - - Wongonui 33338- -. ñeørute 3g312/ Mongonui-o-te-oo 33309/ -. ,' Mångowhero 33lll/ ./ üu-h""ã*h, 33107/ - -\, MoungorouPi 32723¿,/t Tuloenur 32739' / Rongilowo 32735/ Mongohoo 32526- - Mcngoloinoko 32531-' ì,fhonqoehu 29211- - Oroki 3ì803- - Monooloroo 33ì15 / -( j-îftx,t-t-\- -- --O,rouo 325ó3 -Ti¡oumco 32529 Aliwhokolu 29242 ì,--loueru2923l \- --Woiohine29221 / -: -\Hutt 29808 -:- --Hurt 29818 -- - Ruohokopotuno 2'?250 'rv\iil ck 3o5tó --- Rro-oho-ngo2.92Ol Êigutø 4.2 Location of the North lsland catchments' Water & soil technical publication no. 20 (1982) 51
decided instead to use estimates of the 24-hour dura_ tion 2-year return period rainfall derived from the more extensive net$,ork of daily_read gauges, since these could be extrapolated to remotè catchments with greater confidence. The use,of a 2-year recurrence interval seemed ap_ propriate because the mean annual flood has a rècurrence interval only slightly greater than 2 years, 2.33 years if the annual ma,rimã conform to the extreme value Type I (Gumbel) distribution. Estimates of this parameter (without the application of an areal reduction factor) were made from Robertson's data for each catchment using rainfall stations with_ in, or near to, the catchment. These estimates were not adjusted for effects of altitude. These eight characteristics were estimated for each catchment (Table 4.1 and 4.2 for the SI and NI respectively). For those catchments not contoured, channel slópe and mean elevation were undefined; there were 5 such bouth Island catchments and 7 North Island catchments. 4.5 Analys¡s of South lsland data 4.5.1 Preliminary examinat¡on of data table shows that the highest correlations of Q are with AREA and LENGTH, but that signifìcant correlations also occur with all other characteristics except STMFCy. Further strong correlations occur between AREA and LENGTH, between MARAIN andl2}4andalso MARAIN and FOREST. These are all physically plausible. Significant negative correlations occur between Sl0B5 and AREA and not well determined. The results of applying a, stepwise multiple regression program to the data are summarised in Table 4.4. The best fit equation is that involving the three variables AREA, I2A and FOREST and is Q = 4.40 x l0{ AREAÙ.¿'12241.27 (l +FOREST/lcf|/)t 6' .....4.3 The coefficient of determination indicates that glgo of of errors of estimate is given in section 4.10. quently. For the present the data are considered as one. with AREA (Figure 4.3), rs of magnitude for Q for approximate equation for south of the island, and strongly positive residuals on the Q = I.9SAREAo eo 42 where Q is in_m3ls. The linear correlation coefficient (R) between loe (Q) and log (AREA) is 0.85, and the stand;rá error-of_estimate of logarithms of Q is 0.45. Although this correlation is highly significant, the standard errorls too large for Equation 4.2 to be of much value, an obvious con_ clusion when the scatter for Q for any given AREA is con_ sidered (Figure 4.3). Equation 4.2 demonstrates two im- this systematic residual variation may be due to variation in the precipitation regime across the island not fully represented by the estimates of 1221. 4.5.2 Development of tdal rcgionalest¡mators into four regions is of the high rainfall the Southern Alps is des the Nelson area with the \Vest Coast. The division of the East Coast is more tenuous, but is supported by the consistent underestimation of Q for the small catchments along the coast (Figure 4.4), and by the knowledge that some of the morè intenie from cyclonic inland. Specia third inland part comprises T¡He 4.3 Correlation matrix for logs of South lsland characteristics. MARAIN STMFCY s1 085. ELEV* o AREA MARAIN 1224 LENGTH FOREST STMFCY s1085. ELEV' l.OOO .846 .612 .448 .799 .464 -.078 -.473 .383 1.OO0 .2e3 .045 .978 .163 ,010 -.673 .460 l.OOO .753 .228 .647 -.390 -.o51 .ioz l.OOO .o23 .424 -.314 .181 .o98 l.OOO .155 .oo7 -.733 .424 l.OOO -.259 -.134 -.092 l.OOO -,049 -.o47 l.OOO .10,4 1.OO0 I lncomplete Sample 58 Water & soil technical publication no. 20 (1982)
Page 1 and 2:
WATER & SOIL TECHNICAL PUBLICATION
Page 3 and 4:
Regional flood est¡mat¡on in New
Page 5 and 6:
Tables 1.1 Risk ofexceedence for sp
Page 7 and 8: Preface Water & soil technical publ
Page 9 and 10: annual flood Q (the mean of the ann
Page 11 and 12: Water & soil technical publication
Page 13 and 14: Doto ovoiloble on TIDEDA Figure 2'1
Page 15 and 16: P=45 O= 15 x4 (l) '= o o t.25 2'.O
Page 17 and 18: Êv2 ( ko) Reduced Voriote y I'O t1
Page 19 and 20: turn period. A plotting position fo
Page 21 and 22: 'o ,l\, I zl l- I Water & soil tech
Page 23 and 24: Table 3.2 Flow stat¡ons used. SITE
Page 25 and 26: e process of examining the simtrend
Page 27 and 28: Iì_ t_ I I I I I I I t-. I I tñ I
Page 29 and 30: Þ I"IEST COFST 0 o I E 6o o o 25 3
Page 31 and 32: SOUTHEBN REDUCEO Y VRBIßTE NETURN
Page 33 and 34: SOUTH ISLFND HEST COFST I]ÊTR èo
Page 35 and 36: SOUTH CÊNTERBURY DRTÊ NEOUCEO Y V
Page 37 and 38: COMB I NED ,,IE5T CORST DRTR o rt
Page 39 and 40: BÊY OF PLENTY DRTF o o o NEOUCEO Y
Page 41 and 42: NOBTH ISLRND ßEGIONÊL CUBVES 1.50
Page 43 and 44: data for this area are required bef
Page 45 and 46: NELSON REGIONFL CURVE BEOUCEO Y VRR
Page 47 and 48: 46 EÊSTEFìN NEI,,I ZEFLÊND DÊTI
Page 49 and 50: Table 3.9 The grouping and the grou
Page 51 and 52: allowing curves rather than just st
Page 53 and 54: 3.5.5 Extension method The NERC (19
Page 55 and 56: Table 4.1 South lsland catchment ch
Page 57: I 2 t l¡ 5 5 7 I 9 l0 t1 ,12 I5 1{
Page 61 and 62: \Í l{ I t, ìj( Fþurc 4.4 Distrib
Page 63 and 64: 62 Fþurc 4,6 Logarithmic rcsidual
Page 65 and 66: Table 4.6 Final equations for South
Page 67 and 68: I ++ ++ * E 4.6 Analysis of North l
Page 69 and 70: Non Pumice = õ = 3-24xto'6 AREA'7
Page 71 and 72: Northlond f C"ro^ondel f Eost Cope
Page 73 and 74: Table 4.11 Comparable equations for
Page 75 and 76: Poo led cv Pooled o.40 F¡guro 4.12
Page 77 and 78: mates of Cp typically range between
Page 79 and 80: -J æ 'll o Eo !¡ Assemble llood p
Page 81 and 82: Year 1958 1959 1960 l96r t962 1963
Page 83 and 84: The estimate of Q from the regional
Page 85 and 86: Water & soil technical publication
Page 87 and 88: Maguiness, J.A.; Blackwood, P.L.; B
Page 89 and 90: The liequency factor K is a functio
Page 91 and 92: e.9., Linsley et ol. (1915); lrish
Page 93 and 94: Maguiness, J.A.; Blackwood, P.L.; B
Page 95 and 96: sltt 930 t [rûltRÀict ¡ l? s;¡t
Page 97 and 98: 3950't flrlÀRt R tr îlt¡Ît ;tP
Page 99 and 100: S ITI 29202 RuNttiltcl I ¡t tllEtt
Page 101 and 102: ïI-'_____ ::19: lt¡IPt0r n À1 i
Page 103 and 104: 9100r GNE? R ¡T DOBSO| s¡18 93207
Page 105 and 106: 6800 1 sBlrri R tT SrITEC¡,tttS 6I
Page 107 and 108: APPENDIX C Summary of tho data for
Page 109 and 110:
oæ ON LAT. STATION NA ATION LAT. N
Page 111 and 112:
o NUI,IBER HHAKAIIARU 854801 38 L7'
Page 113 and 114:
l9 AT NU¡IB ËR AR',tËtlANA ÂRAI
Page 115 and 116:
A ON LAT. STATION NA NUMBER AHUNA 5
Page 117 and 118:
â NUI,IBER Lü{G.E ON NU14EER I,IU
Page 119 and 120:
æ TATI ¡rouNT sor.tERS 7L740? 43
Page 121 and 122:
N) o STATIoN NAr{gmLfï3---ffij NUI
Page 123 and 124:
APPENDIX E Compadson of Regional Fl
Page 125 and 126:
Table F.2 Flood peak data. NEW OTAG
Page 127 and 128:
F.3 Analysis and results tatively p
Page 129 and 130:
ét êt REOUCEO VßFIHTE 2. 33 5 l0
Page 131 and 132:
SOLITH I EA l') COAST soUTH CANTERB
Page 133 and 134:
0tiftflt a itÉitut5 ü¡. il/5 tg?
Page 135:
Water & soil technical publication
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