## 3 Results
The same pattern of the prevailing RSS \(\tau_{uw}\) component, in comparison to \(\tau_{uw}\) and \(\tau_{vw}\), is observed, with \(\tau_{uw}\) higher by +64% and +52% on average, respectively. Differences between RSS components in corresponding VS fishways are +76% and +90% on average. A reduction in the slope, while retaining the same pool length in the VS fishway, also results in an increase in the RSS across the flow depth, in comparison to i125l60 \(\tau_{uw}\), \(\tau_{uw}\), and \(\tau_{vw}\) components are increased by +20%, +38%, and +29%. The same slope reduction in the PO fishway has an opposite effect--a reduction in RSS for all planes and orifice sizes: smallest for o8 (\(-\)6%), and equal for o10 and o12 (\(-\)14%). RSS values are the lowest on plane A, and increase towards plane C for all PO fishways, while in the VS fishway, RSS values are similar for all planes (<7% difference). RSS values in the PO fishways are exceeding 30 N/m\({}^{2}\) on average only for o12 orifices and plane C (32 N/m\({}^{2}\)), and on all planes in the VS fishway (<45 N/m\({}^{2}\)). Fishway with the longest pool among the middle bottom slope (i100l90, Figure 10) does not differ significantly in the RSS distribution when compared to the shorter pool of the same bottom slope (i100l60) or the same pool length with a steeper slope (i125l90). Average difference in RSS values compared to i100l60 is +18%, \(-\)5%, and +13% for PO fishways with o8, o10, and o12 orifices, respectively, and +8% in the VS fishway. Average  
Figure 8: 3D scatterplot of concurrent RSS components for the i100l45 fishway configuration: (**a**) pool-office type fishway and (**b**) vertical slot fishway. difference in RSS values compared to i125190 is \(-\)14%, +1%, and +8% for PO fishways with o8, o10, and o12 orifices, respectively, and +15% in the VS fishway. The same pattern of the prevailing \(\tau_{uw}\) RSS component, in comparison to \(\tau_{uw}\) and \(\tau_{vw}\) is observed, with \(\tau_{uw}\) higher by +64% and +63% on average, respectively. Differences between RSS components in corresponding VS fishways are +104% and +75% on average. RSS values are lowest on plane A, and increase towards plane C for all PO fishways, while in the VS fishway, RSS values are similar for all planes (<10% difference). RSS \(\tau_{uw}\) values in the PO fishways are exceeding 30 N/m\({}^{2}\) on average only for o10 (plane C) and o12 orifices (planes B and C), and exceed 40 N/m\({}^{2}\) on all planes in the VS fishway (<51 N/m\({}^{2}  
between RSS components in corresponding VS fishways are +107% and +94% on average. RSS values are lowest on plane A, and increase towards plane C for all PO fishways, while in the VS fishway, RSS values differ <18%. RSS \(\tau_{uw}\) values in the PO fishways are exceeding 30 N/m\({}^{2}\) on average only for o10 (all planes) and o12 orifices (plane C), and exceeding 38 N/m\({}^{2}\) on all planes in the VS fishway (<51 N/m\({}^{2}\)). Fishways with the mildest bottom slope and middle pool length (i075160, Figure 12) differ significantly in RSS distribution when compared to the other PO fishways with the same pool length and a different slope. The average difference in RSS values compared to i125160 is +37%, \(-\)23%, and \(-\)5% for PO fishways with o8, o10, and, o12 orifices, respectively and +29% in VS fishways. The average differences in RSS values compared to i100145 are +45%, \(-\)11%, and +11% for PO fishways with o8, o10, and o12 orifices, respectively, and +1% in the VS fishway. The same pattern of prevailing RSS \(\tau_{uw}\) components, in comparison to \(\tau_{uw}\) and \(\tau_{vw}\), is observed, with \(\tau_{uw}\) being higher by +56% and +53% on average, respectively. Differences between RSS components in corresponding VS fishways are +107% and +106% on average. RSS values are similar on planes A and B for all PO fishways, with the highest values observed in plane C. In comparison to i075445, RSS values are increasing for o8 and decreasing for o10 and o12.