The 'founding executive' of NASH is as follows (as of February 2012)

Stu Hamilton
Greg MacCulloch
Robyn Andrishak
Russell Boals
Paul Whitfield

Message from the President April, 2013
I have had a number of queries from NASH members wondering whether NASH is still alive and well, having not heard much since the 2012 Symposium and AGM.

One reason for this is that we still have not finalized a governance structure for NASH. What we want is for NASH to be accessible (read affordable) at a grass roots level which means we need to find a governance model that works multi-nationally with a minimum of administrative overhead.

While we continue to work toward a formal membership structure we lack a formal communications strategy. However, that does not mean that there has not been anything going on that you might be interested in. Here are a few highlights:

2013 AGM will be a virtual meeting held in August by teleconference. An exact date/time and call in details will be provided closer to the time.

We are looking into a NASH session at the AWRA national conference in Portland. There will be at least one presentation to promote NASH to AWRA members. We will need a few more paper to justify a full session. Please let me know if you have a paper you would like to submit before the deadline for abstracts on May 10.

We have been looking into a way to leverage the very good work on stream hydrography being done by the Australian Hydrographers Association, NIWA The World Meteorological Organization (WMO) and the International Association of Hydro-Environment Engineering and Research (IAHR) are also interested in opportunities for improved communication amongst stream hydrographers. An informal global network of societies for stream hydrography is evolving out of these discussions.

A NASH symposium was held at the BC Branch conference of the Canadian Water Resources Association in Vancouver The two NASH sessions were very well attended. I think it is significant that the interest in stream hydrography is so high that the plenary room was needed to accommodate the NASH sessions. The NASH presentations from these sessions have been posted on the NASH wiki:

A full-day workshop on dilution gauging was very well attended. There were thirty registrants and there were about ten people who had to be turned away. Two of the conference presentations were on the development of best practices for the slug salt injection method. These practices were taught during the workshop and the results of the workshop speak to the benefit of these recommended practices.

The stream reach being gauged was a rough (n > 0.1?), high gradient (slope >0.01?) reach at low flow (Q ~0.16 m3/s) with steady stage for the duration of the workshop. Replicate measurements were made with Price AA current meter (1), FlowTracker ADV (1), slug Rhodamine dye injection (9), constant rate salt injection (3), and slug salt injection (20) with the variants covering various mixing lengths and sensor technologies. The constant rate injections were also re-computed as slug injections (possible because the sensors were left in place to recover to background concentration) for a total of 37 discharge measurements.

While the intent of the workshop was not to quantify uncertainty or measure the variance amongst methods, some conclusions are unavoidable. The take-home message for me was that the measurements made using the proposed best practices approach were all in close agreement over a representative range of technological sophistication and hydrographer experience. The same could not be said for the other measurements that produced a wide range in calculated discharge.

The development of the best practices approach was by rigorous sensitivity analysis of each of the steps in the method. The guidance resultant from this analysis allows the hydrographer to optimize efficiency by focusing attention on those details that have high leverage on result while allowing for adaptation of method to local conditions.

There is almost no incremental cost to following the best practice protocol but, apparently, a large improvement in measurement reliability.

NASH will continue to organize and run workshops on stream gauging. Please let me know if you would like to assist organizing a workshop in your region for a hydrometric issue of concern.

If you are are LinkedIn member you may like our LinkedIn page