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Service Description: 1. Modelled flood frequency estimates on river lines
NZREACH NZ digital network 1 ID no.
Rivername where available
nzreach_1 duplicate of item 1
Areakm2 catchment area draining to the downstream end of this reach (square kilometres)
q100_reach ratio of Q100 (1% aep flood) to mean annual flood
H&C18_MAF mean annual flood (cumecs)
H&C18_5-yr 5-yr (20% aep) flood (cumecs)
H&C18_10y 10-yr (10% aep) flood (cumecs)
H&C18_20y 20-yr (5% aep) flood (cumecs)
H&C18_50y 50-yr (2% aep) flood (cumecs)
H&C18_100y 100-yr (1% aep) flood (cumecs)
H&C18_1000y 1000-yr (0.1% aep) flood (cumecs)
HCse_MAF standard error of mean annual flood (cumecs)
HCse_5y standard error of 5-yr (20% aep) flood (cumecs)
HCse_10y standard error of 10-yr (10% aep) flood (cumecs)
HCse_20y standard error of 20-yr (5% aep) flood (cumecs)
HCse_50y standard error of 50-yr (2% aep) flood (cumecs)
HCse_100y standard error of 100-yr (1% aep) flood (cumecs)
HCse_1000y standard error of 1000-yr (0.1% aep) flood (cumecs)
Strm_Order Strahler stream order (1=headwater, two ones join to make an order 2, etc.)
2. At-site flood statistics at flow recorders used in the model development Siteno NIWA reference number for flow recorder Name Flow recorder name generally 'river' at 'location'
NZTM_E NZTM easting
NZTM_N NZTM northing
Region Regional council or unitary authority territory
Operator Organisation that oprates the flow recorder
Funder Organisation that funds the flow recorder (can be more than one)
Area_km2 catchment area draining to the flow recorder (square kilometers)
No_years Number of years in the annual flood series (allowing for years with missing data)
L1_mean Mean of the annual flood series (linear moment 1)
L2 Linear moment 2 of the annual flood series (analogous to standard deviation)
Lcv Linear CV of the annual flood series (L2/L1)
T3_Lskew Linear skew ratio of the annual flood series
T4_Lkurt Linear kurtosis ratio of the annual flood series
Gumb_u Gumbel distribution u of the annual flood series
Gumb_alpha Gumbel distribution alpha of the annual flood series
GEV_u Generalised Extreme Value u of the annual flood series
GEV_alpha Generalised Extreme Value alpha of the annual flood series
GEV_k Generalised Extreme Value k of the annual flood series
GEV_z Hosking-Wallis normal standard variate to test significance of GEV-k (is the at-site distribution Gumbel or not?)
Data 2.33y mean annual flood (2.33-yr assuming Gumbel, or 43% aep)
Data 5y 5-yr (20% aep) flood (cumecs)
Data 10y 10-yr (10% aep) flood (cumecs)
Data 20y 20-yr (5% aep) flood (cumecs)
Data 50y 50-yr (2% aep) flood (cumecs)
Data 100y 100-yr (1% aep) flood (cumecs)
Data 250y 250-yr (0.4% aep) flood (cumecs)
Data 500y 500-yr (0.2% aep) flood (cumecs)
Data 1000y 1000-yr (0.1% aep) flood (cumecs)
se_2.33y standard error of mean annual flood (%)
se_5y standard error of 5-yr (20% aep) flood (%)
se_10y standard error of 10-yr (10% aep) flood (%)
se_20y standard error of 20-yr (5% aep) flood (%)
se_50y standard error of 50-yr (2% aep) flood (%)
se_100y standard error of 100-yr (1% aep) flood (%)
se_250y standard error of 250-yr (0.4% aep) flood (%)
se_500y standard error of 500-yr (0.2% aep) flood (%)
se_1000y standard error of 1000-yr (0.1% aep) flood (%)
3. Return period estimates of the area-rain intensity values for small catchments. Where results display '-1' the catchment is greater than 30 square kilometres and no answer is available. Numbers need to be multiplied by the Rational Method 'C' factor to give the required flood magnitude.
NZREACH NZ digital network 1 ID no.
DEMTAREA catchment area draining to the flow recorder (square kilometers)
QIA_5y 5-yr (20% aep) IA estimate
QIA_10y 10-yr (10% aep) IA estimate
QIA_20y 20-yr (5% aep) IA estimate
QIA_50y 50-yr (2% aep) IA estimate
QIA_100y 100-yr (1% aep) IA estimate
QIA_1000y 1000-yr (0.1% aep) IA estimate
4. Annual data values at flow recorders used in the model development
Layer coming later.
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Description:
Copyright Text: NIWA
Spatial Reference:
2193
(2193)
Single Fused Map Cache: false
Initial Extent:
XMin: 1882023.097224192
YMin: 5771864.768616569
XMax: 1888711.7772682195
YMax: 5777119.404125839
Spatial Reference: 2193
(2193)
Full Extent:
XMin: 1090154.6277
YMin: 4748852.6367
XMax: 2089112.8753000004
YMax: 6193369.0554
Spatial Reference: 2193
(2193)
Units: esriMeters
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
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Comments: 1. Modelled flood frequency estimates on river lines
NZREACH NZ digital network 1 ID no.
Rivername where available
nzreach_1 duplicate of item 1
Areakm2 catchment area draining to the downstream end of this reach (square kilometres)
q100_reach ratio of Q100 (1% aep flood) to mean annual flood
H&C18_MAF mean annual flood (cumecs)
H&C18_5-yr 5-yr (20% aep) flood (cumecs)
H&C18_10y 10-yr (10% aep) flood (cumecs)
H&C18_20y 20-yr (5% aep) flood (cumecs)
H&C18_50y 50-yr (2% aep) flood (cumecs)
H&C18_100y 100-yr (1% aep) flood (cumecs)
H&C18_1000y 1000-yr (0.1% aep) flood (cumecs)
HCse_MAF standard error of mean annual flood (cumecs)
HCse_5y standard error of 5-yr (20% aep) flood (cumecs)
HCse_10y standard error of 10-yr (10% aep) flood (cumecs)
HCse_20y standard error of 20-yr (5% aep) flood (cumecs)
HCse_50y standard error of 50-yr (2% aep) flood (cumecs)
HCse_100y standard error of 100-yr (1% aep) flood (cumecs)
HCse_1000y standard error of 1000-yr (0.1% aep) flood (cumecs)
Strm_Order Strahler stream order (1=headwater, two ones join to make an order 2, etc.)
2. At-site flood statistics at flow recorders used in the model development Siteno NIWA reference number for flow recorder Name Flow recorder name generally 'river' at 'location'
NZTM_E NZTM easting
NZTM_N NZTM northing
Region Regional council or unitary authority territory
Operator Organisation that oprates the flow recorder
Funder Organisation that funds the flow recorder (can be more than one)
Area_km2 catchment area draining to the flow recorder (square kilometers)
No_years Number of years in the annual flood series (allowing for years with missing data)
L1_mean Mean of the annual flood series (linear moment 1)
L2 Linear moment 2 of the annual flood series (analogous to standard deviation)
Lcv Linear CV of the annual flood series (L2/L1)
T3_Lskew Linear skew ratio of the annual flood series
T4_Lkurt Linear kurtosis ratio of the annual flood series
Gumb_u Gumbel distribution u of the annual flood series
Gumb_alpha Gumbel distribution alpha of the annual flood series
GEV_u Generalised Extreme Value u of the annual flood series
GEV_alpha Generalised Extreme Value alpha of the annual flood series
GEV_k Generalised Extreme Value k of the annual flood series
GEV_z Hosking-Wallis normal standard variate to test significance of GEV-k (is the at-site distribution Gumbel or not?)
Data 2.33y mean annual flood (2.33-yr assuming Gumbel, or 43% aep)
Data 5y 5-yr (20% aep) flood (cumecs)
Data 10y 10-yr (10% aep) flood (cumecs)
Data 20y 20-yr (5% aep) flood (cumecs)
Data 50y 50-yr (2% aep) flood (cumecs)
Data 100y 100-yr (1% aep) flood (cumecs)
Data 250y 250-yr (0.4% aep) flood (cumecs)
Data 500y 500-yr (0.2% aep) flood (cumecs)
Data 1000y 1000-yr (0.1% aep) flood (cumecs)
se_2.33y standard error of mean annual flood (%)
se_5y standard error of 5-yr (20% aep) flood (%)
se_10y standard error of 10-yr (10% aep) flood (%)
se_20y standard error of 20-yr (5% aep) flood (%)
se_50y standard error of 50-yr (2% aep) flood (%)
se_100y standard error of 100-yr (1% aep) flood (%)
se_250y standard error of 250-yr (0.4% aep) flood (%)
se_500y standard error of 500-yr (0.2% aep) flood (%)
se_1000y standard error of 1000-yr (0.1% aep) flood (%)
3. Return period estimates of the area-rain intensity values for small catchments. Where results display '-1' the catchment is greater than 30 square kilometres and no answer is available. Numbers need to be multiplied by the Rational Method 'C' factor to give the required flood magnitude.
NZREACH NZ digital network 1 ID no.
DEMTAREA catchment area draining to the flow recorder (square kilometers)
QIA_5y 5-yr (20% aep) IA estimate
QIA_10y 10-yr (10% aep) IA estimate
QIA_20y 20-yr (5% aep) IA estimate
QIA_50y 50-yr (2% aep) IA estimate
QIA_100y 100-yr (1% aep) IA estimate
QIA_1000y 1000-yr (0.1% aep) IA estimate
4. Annual data values at flow recorders used in the model development
Layer coming later.
Subject: A map service that functions as a web application where users can derive flood statistics, return period for rain intensity,flood frequency,and annual flow recorder data.
Category:
Keywords: floods,annual average,flow recorders,catchments,Catchment,Flood,Flood Estimation,flood statistics,Floods,flow sites,Henderson Collins,REC1,return period,stream order,Topomaps
AntialiasingMode: None
TextAntialiasingMode: Force
Supports Dynamic Layers: true
MaxRecordCount: 1000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, AMF, geoJSON
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
Child Resources:
Info
Dynamic Layer
Supported Operations:
Export Map
Identify
QueryDomains
Find
Return Updates
Generate KML