AQUARIUS Time-Series

Better, Reliable Rating Curves

The AQUARIUS Time-Series Rating Development environment is the world’s most powerful tool for building and maintaining rating curves. You can quickly visualize gauging measurements, focus on hydrologic relations, and shift or blend ratings to account for conditions like scour, fill, weeds, and ice.

Build Stage Discharge Rating Models

The development of river stage versus discharge curves is a key step in any hydrographer’s work. Field measurements, cross sectional survey data, and dynamic river conditions (such as backwater, scour, fill, and weed growth) all have to be taken into account when calculating discharge. The accuracy of your computed discharge data is critically dependent on your rating curves. AQUARIUS Time-Series puts all the information you need at your fingertips so you can be confident in the rating curves that you build.

Follow the Standards

The science and art of drawing rating curves has been fine-tuned over 100+ years of dedicated work by the world’s leading hydrometric agencies. International standards have been developed and published by the International Organization for Standards (ISO), the World Meteorological Organization (WMO), and in US Geological Survey (USGS) Technical References. AQUARIUS Time-Series allows you to conform to these standards – it is the tool used by the very agencies who are the leaders in writing the international standards. The AQUARIUS Time-Series rating curve development environment is the tool used by the USGS, Water Survey Canada (WSC), the National Institute of Water and Atmospheric Research (NIWA), and a host of other leading organizations for the development and maintenance of their stage versus discharge curves.

Shift or Blend Your Rating Curves Easily

Calculating accurate river flows from a rating curve means adjusting the curve to account for changes to river controls like scour, fill, debris, ice, and plant growth. This has traditionally been time consuming, often involving re-drawing an entire curve or tweaking with least squares fitting weights. AQUARIUS Time-Series makes this easy, so you can focus on the hydrology. Shift adjustments to a rating curve can be drawn quickly. Rating shifts can be applied as constants or can be phased in through time to avoid jumps in the calculated hydrograph. Individual rating curves within the model can be blended (prorated) from one to the next for smooth transitions.

Compute Index Velocity in Real-Time

While stage discharge ratings are the most commonly used method to derive flow calculations, over 30% of water professionals today use the index velocity method to measure the flow of water in complex environments like backwater, tidal flow, bi-directional flow, reversing flow, small-gradients, and rapid flow. AQUARIUS Time-Series can be used to perform index velocity computations in real time with a combination of rating derivation (for stage-area) and calculated time series (for mean velocity and discharge). Applying stage-area and mean velocity ratings to incoming data automatically computes discharge.