The data stored on the server is relatively small compared to the network data flow between the server and clients
(browsers).
With each refreshing of user's browser,the server generates six WFS-TXML files that are sent to the browser.
Even a small water resource model can generate substantial network traffic.
For example in our simple Zletovica river basin model, one browser refreshing was generating 3 MB of download.
Future research on similar web applications needs to address this important issue