basic, technical, Webinars

Christmas cracker

We are calling this our “Christmas Cracker” webinar for two good reasons. Firstly, it was held just 10 days before Christmas. Secondly, it was entertaining, and easy to listen to.


On 22 September 2020, Jeremy White and Mike Fienen from the USGS presented a GMDSI sponsored webinar on PEST++ V5.  PEST++ V5 includes a wide

Who cares? What will it cost?

Approaches to improve the value of models and to reduce total project costs. Presented by Ty Ferre, University of Arizona. Download on VIMEO

Getting the Most out of PEST – Part 2

This second video of a two-part series covers calculation of finite-difference derivatives, defences against model output numerical granularity, some aspects of observation weighting, termination criteria,

What is PEST?

This video provides an overview of PEST and the three families of utility software that accompany it. It also provides a brief discussion of the

3. Well Posed Inversion

This video shows how parameters can be estimated when model calibration constitutes a well-posed inverse problem. However, in groundwater modelling, well-posedness does not occur unless

1. Vectors and Statistics

This video provides a short refresher on some aspects of matrix and vector algebra that we all learned at school but have since forgotten. It

2. What is Calibration?

This short video discusses what it means to calibrate a groundwater (or other) model. Calibration implies uniqueness. The quest for uniqueness is not a quest