... annual rainfall, as shown in the map below. I Rainfall intensity i n Net rainfall intensity q t Discharge at time t q ... NIWA National Institute of Water and Atmospheric Research PCA Principal Component Analysis SWMM Stormwater Management Model developed the short-duration intensity duration frequency (IDF) curve for SCC with return period of 2, 5, 10, 50 and 100 years.. And also Logah et al. Seasonal Forecasts and Climate Change Historical Data and Indicators. New Zealand has a wide range of annual regional rainfalls. The following Coefficients are provided as a guide. The previous method for flood estimation, dating from 1989, is in need of updating because more extreme events pathways map for Tangoio Marae. When the co-ordinates of a site are known, site-specific values can be obtained using NIWA’s HIRDS tool at https://hirds.niwa.co.nz/ See our 2016/17 report card for further information about rainfall and water levels on the Kāpiti Coast factor, R is a rainfall factor depending on the design storm, S is a catchment shape factor governed by area and channel length, and A is the catchment area. Thunderstorms form as a result of moist air rising rapidly through a considerable depth of the atmosphere – in New Zealand, typically to about 30,000 feet. Rainfall data from 82 sites throughout Canterbury, measuring intensities in 7.5 or 15-minute intervals, reported alongside data measured by partner agencies at 11 other sites. Version: {{version}} Copyright 2015 NIWA The rainfall intensity for different parts of the country can be obtained from E1/AS1 Appendix A. Alternatively, rainfall intensity may be calculated online using the NIWA HIRDS (High Intensity Rainfall Design System) online tool, available on the NIWA website at www.niwa.co.nz . Source: MetService courtesy of Transpower New Zealand Limited Definition and methodology. a point, using the map or otherwise. 38 ... More frequent weather extremes with higher rainfall intensity, potentially elevating flood risk in already flood prone catchments and an increased risk of drought. where P t is the required rainfall depth in mm at t-h duration, P 24 is the daily rainfall in mm and t is the duration of rainfall for which the rainfall depth is required in hr. *NIWA – National Institute of Water and Atmospheric Research. NIWA’s HIRDS (High Intensity Rainfall Design System) software. For the stations located south of the SPCZ, this may also be linked to the observed warming since the 1970s. ... NIWA National Institute of Water & Atmospheric Research. Using the same equation, Chowdhury et al. NIWA and Metservice. Tabulated rainfall intensity data for a variety of return period storm durations was obtained for the site from the NIWA High Intensity Rainfall System V3 on-line data base. Flood estimation and its companion discipline, extreme rainfall intensity estimation, are critical aspects of the design of a large amount of the built infrastructure of New Zealand. extremes NIWA CliFlo - The National Climate Database NIWA HIRDS - High Intensity Rainfall Design System - includes rainfall return periods The High Intensity Rainfall Design System (HIRDS) provides estimates of high intensity rainfall at ungauged locations for a range of return periods and event durations. NIWA - National Climate Centre - with daily climate maps, also climate summaries NIWA NZ Drought Monitor - map and graphs NIWA - Climate Data (Education & Training) - incl. How are the flood hazard maps prepared? Analysis of local rain gauge information 3. Changes in Serving Hourly Data Sourced from MetService. ORC bores were not included in this analysis. Flooding at Parawa Map Location: -45.541315 168.530494 Rainfall intensity for the last hour (mm/h) Rainfall total for the last 24 hours (mm) Castle Rock Castle Rock in the Matawai Catchment: 09/12/20 08:00: 0.0: 0.0: Control Structure Whangamarino Control Structure in the Whangamarino Catchment: 09/12/20 09:00: 0.0: 0.0: Golden Cross Golden Cross in the Waitekauri Catchment: 09/12/20 08:00: 0.0: 0.0 observed difference between rainfall depths calculated from at site frequency analysis of intensity gauges and HIRDS v2. ,, . (viii) Total quantity of rainfall in the catchment area. Figure 19. Notably, all significant abrupt changes in an extreme rainfall intensity index occurred in the late 1970s or early 1980s, and in every case the index showed an increase in extremity following the change point, regardless of station location. Note that this site address is used only for convenience if printing calculations to attach to documentation. This map shows the maximum amount of rain that is likely to fall in any 24 hours over a 100 year period. The available data for the area for the period 1930-2008 are shown as timelines in extreme rainfall, has been extracted from NIWA’s High Intensity Rainfall Design System (HIRDS v4). The primary purpose of the telemetered rainfall network is to provide an early flood warning network for the region, in particular in the Wairoa and northern part of the region. Rainfall Intensity Curve Return Period in Yrs 5 10 2 2 Runoff Coefficient (C) 0.75 0.75 0.55 0.6 In refining the estimate of runoff coefficient, the coefficients provided in NZ Building Code E1 Table 2 shall be used. The catchment rainfall data, or an estimate of it, drives the empirical flood flow estimation methods (TM61 and rational method). >>100 years at 14 days) The Te Kuiti gauge recorded a 14-day rainfall with a return period of more than 100 years. The markers indicate the location of the bores used to determine mean water table elevation, with the contour lines inferred. This data is Previous studies The HIRDS system is a nationwide tool produced by NIWA which provides DDF information for any point in New Zealand. All sites use a 0.5mm tipping bucket rain gauge and record rainfall intensity information at 15 minute intervals. Key monitoring results and highlights are presented in our annual report cards (see below). Toggle navigation. Data can be used to assess storm intensities, provide the basis for flood warnings and provide daily, monthly or annual rainfall totals. NIWA, 2002: HIRDS v2.0 – High Intensity Rainfall Design System Pascoe, R.M., 1982: The flood of 1 April 1975 in the Wairau River, Marlborough, New Zealand. Available rainfall records Rainfall data for daily read and recording (automatic) gauges were assembled from NIWA’s climate database, from the Tasman District Council (TDC) and Nelson City sources. We monitor rainfall and water levels at a number of different sites across the region. These values can be used in conjunction with clause E1 of the Building Code. Rainfall intensity can be taken off the maps for 50-year average return intervals (ARI). High intensity rainfall analysis for Nelson urban area 2 2. A comparison is then made at some stations between these relations and those predicted by the computer package, HIRDS (High Intensity Rainfall Design System, Version 2), described by Average annual lightning ground and sea strikes, 2001–16 – interactive map. It takes many great events and preferably of a lighter intensity. These surfaces can be used for design storm assessment and in the design of flood protection works and other waterway structures. The procedure fits a three-parameter generalised extreme value (GEV) distribution, and produces storm rainfall depths for a range of durations from 10 minutes to 72 hours and for a range of recurrence intervals from 2 to 150 years. New … Some areas, such as parts of Hawke’s Bay, coastal Canterbury and Central Otago, receive less than this. rainfall intensity for use with E1/AS1 – rainfall Intensity values are sourced from NIWA’s High Intensity Rainfall Design System (HIRDS) calculator and correspond to a 10-minute rainfall intensity with an annual probability exceeding 10%. Method # 2. The area of land being studied is called a catchment. The Te Kuiti gauge recorded a three-day rainfall with a return period of 33 years. Rainfall intensity values are sourced from NIWA's HIRDS calculator and correspond to a 10-minute rainfall intensity with an annual probability of exceedance of 10%. Third, rainfall depth-return period relations are derived for the durations of the first step for all rainfall stations. (vii) Intensity of rainfall; Run-off is more if the same amount of rainfall say 50 mm is within a very short period of, say, two hours than is spread for a larger period of, say, 24 hours in which case it is in the form of drizzling. Compared to 2003-2004 where annual Rainfall data can be sourced from the NIWA high intensity rainfall data system (HIRDS). This is close to the estimated increase in storm rainfall between 2002 and 2009 (10% increase from frequency analysis – all durations) Version 4 takes account of predicted climate change. This address is not factored into calculations - you must determine intensity from Rainfall Intensity Maps or NIWA's HIRDS tool. Most regions have an annual rainfall of 600–1,600 millimetres per year. The address is not recorded or … HYDROLOGY Annual Monitoring Report 2004-2005 ... regional coverage of rainfall distribution patterns during high intensity rainfall events. • HIRDS v3 gives rainfall depths 9% greater than v2 for intensity gauge sites. Title: Code of Practice for City Services & Land Development - Figures 4.01 - Rainfall Intensity Curves Author: Waitakere City Council Created Date HIRDS V3 is the most current … High Intensity Rainfall Design System (HIRDS) V3 2. These variables are presented as maps or tables for two climate change scenarios (Representative Concentration Pathways) and two future time periods (2040 and 2090). The rainfall event used to develop the 100-year flood uses a High Intensity Rainfall Database from NIWA* to create a set of 100-year events of differing durations, from 10 minutes to 24 hours. Map showing the mean elevation of the water table in metres above MSL, across the South Dunedin plain, over a oneweek period in July 2- 012 without rainfall. At Moa Flat, the observed rainfall of 112 mm (11.2 cm) exceeded 100 year rainfall limits. Rainfall intensity. The Canterbury Plains near Timaru are particularly dry. 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