This issue includes:

• Editor’s Introduction
• From the President
• Maximize Acoustic Doppler Accuracy during Extreme Events with Hydrographic Principles. Daniel Wagenaar
  
• Suspended Sediment & Turbidity Monitoring in NZ – a product of Extreme events. Evan Baddock
  
• The growing demand and difficulties of hydrometric measurement of extreme events in urban stormwater and sewers. Justin Stockley
  
• From the Vault: Statistical Indicators to Assess Gauging Station Performance. Allan Deane and Russell Marks