... annual rainfall, as shown in the map below. The following Coefficients are provided as a guide. ORC bores were not included in this analysis. NIWA and Metservice. >>100 years at 14 days) The Te Kuiti gauge recorded a 14-day rainfall with a return period of more than 100 years. 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. 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. 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. 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 . 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 (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. Rainfall data can be sourced from the NIWA high intensity rainfall data system (HIRDS). 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. Key monitoring results and highlights are presented in our annual report cards (see below). 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. The markers indicate the location of the bores used to determine mean water table elevation, with the contour lines inferred. 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. Empirical Formulae: 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. Note that this site address is used only for convenience if printing calculations to attach to documentation. 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. • HIRDS v3 gives rainfall depths 9% greater than v2 for intensity gauge sites. Version 4 takes account of predicted climate change. 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 Data can be used to assess storm intensities, provide the basis for flood warnings and provide daily, monthly or annual rainfall totals. 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/ 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. NIWA - National Climate Centre - with daily climate maps, also climate summaries NIWA NZ Drought Monitor - map and graphs NIWA - Climate Data (Education & Training) - incl. extreme rainfall, has been extracted from NIWA’s High Intensity Rainfall Design System (HIRDS v4). HIRDS V3 is the most current … These surfaces can be used for design storm assessment and in the design of flood protection works and other waterway structures. 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. 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. 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%. The area of land being studied is called a catchment. How are the flood hazard maps prepared? Figure 19. We monitor rainfall and water levels at a number of different sites across the region. Some areas, such as parts of Hawke’s Bay, coastal Canterbury and Central Otago, receive less than this. 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