Sea Level Network - Waikato Regional Council

Water level measurements enable storm surges, tidal amplitude and phase and seiche period to be measured, and tidal and storm surge statistics calculated. There are currently four tide gauges maintained by the Waikato Regional Council - Whitianga (1999), Tararu (1990), Kawhia and Raglan. This allows a complete tidal analysis and a thorough comparison of storm surge with Moturiki Island. To identify long term sea level trends and expected extreme sea levels.

Whitianga: July 1999 - present. 1-5 minute sampling interval. Tararu ("Thames Tide"): May 1990 - present. 1-7.5 minute sampling interval. Kawhia Wharf: August 2008 - present. 1-2 minute sampling interval. Raglan Wharf: Manu Bay: 22 March 2018 - ??

Few hundred metres offshore from Tararu. Whitianga Wharf Kawhia Wharf Raglan Wharf

Tararu – Lat. 37o13'S Long. 175o52'E, or E2733116 N6451232, NZMG, 1:20000, point Whitianga wharf: NZMG: T11 520-818

Tararu: 15th May 1990 - ongoing Whitianga: 14th July 1999 – ongoing Mokau River at Boat Ramp Data from 21/07/09 to present Kawhia Harbour at Kawhia Wharf Data from 29/08/08 to present Manu Bay at Boat Ramp Data from 11/07/08 to 27/10/09 (temporary site) Raglan Harbour at Wharf Data from 01/07/08 to 30/03/10 (site closed after Wharf fire) Raglan Harbur at Wharf re-opened XXXX... Kawhia Harbour

Miltronic acoustic device connected to an Aquitel telemetry unit. Frequency of collection: Continuous, interval dependent on site.

Large gaps affect data analysis. Tides at Tararu are amplified because of the relatively shallow waters of the Firth and therefore are not representative of other parts of the Firth or the north-eastern coast. Whitianga Wharf site in shelted Harbour, tides affected. Tararu: several short term gaps + a gap of 27 days in 1992. Whitianga: 16/02/2000 @ 06:45:01 to 16/02/2000 @ 13:44:59 = 7 hours 05/07/2000 @ 09:20:01 to 07/07/2000 @ 13:24:59 = 52 hours 17/05/2002 @ 10:15:01 to 20/05/2002 @ 00:04:59 = 62 hours 24/05/2002 @ 09:15:01 to 24/05/2002 @ 13:09:59 = 4 hours 26/05/2002 @ 18:10:01 to 26/05/2002 @ 20:09:59 = 2 hours 15/09/2002 @ 06:10:01 to 15/09/2002 @ 08:09:59 = 2 hours Data quality: 1 mm resolution - gaps and problems with data reported in relevant technical publications. Completeness: Gaps and bad data noted in data reports, including several short term gaps, a gap of 27 days in 1992, and a period of instrument malfunction.

Electronic, graphs, reports, Environment Waikato website in rivers and rainfall section. Digital Format: Can be provided in electronic form as required (MS Excel / tideda / ascii text)

Freely available Can be seen through the WRC website or Coastal Inundation Tool (links below)

Ongoing