Falls River Project Water Use Plan Falls River Fish ... - BC Hydro
Falls River Project Water Use Plan Falls River Fish ... - BC Hydro
Falls River Project Water Use Plan Falls River Fish ... - BC Hydro
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>Falls</strong> <strong>River</strong> WUP Monitoring 2008/2009<br />
Avg. daily discharge (cms)<br />
160<br />
140<br />
120<br />
100<br />
80<br />
60<br />
40<br />
20<br />
0<br />
10/09/08<br />
6.5 cms -<br />
min<br />
discharge<br />
Aug 1st -<br />
Oct 15th<br />
(WUP)<br />
20/09/08<br />
30/09/08<br />
10/10/08<br />
20/10/08<br />
30/10/08<br />
09/11/08<br />
19/11/08<br />
29/11/08<br />
09/12/08<br />
19/12/08<br />
29/12/08<br />
08/01/09<br />
Cambria Gordon and Metlakata <strong>Fish</strong>eries 22<br />
18/01/09<br />
28/01/09<br />
Date<br />
07/02/09<br />
17/02/09<br />
27/02/09<br />
2.6 cms - min<br />
discharge year<br />
round for reservoir<br />
elevation > 88.4m<br />
(WUP)<br />
Figure 11: <strong>Falls</strong> <strong>River</strong> average daily discharge (total outflow from turbines and spillway) from September 23,<br />
2008 to May 21, 2009. Red line displays the WUP recommended minimums discharge during the salmon<br />
spawning period (6.5 cms – August 1 st to October 15 th ) and year round minimum discharge (2.6 cms). If the<br />
reservoir elevation drops below 88.4 m, turbine discharge will be reduced to 1.3 cms to conserve water and<br />
ensure that some flows to the river can be maintained (<strong>BC</strong> <strong>Hydro</strong> 2006a). Data is not available from Dec 28 th ,<br />
2008 – Jan 6 th , 2009.<br />
3.3.1 Stage/Discharge Relationship<br />
We used the dataset of hourly depth and associated hourly discharge to attempt to develop a stage<br />
discharge curve at the site. This analysis provided strong correlations for some months, but weak<br />
correlations for others.<br />
The nine graphs in Figure 12 show the relationship between total discharge into the tailpond and<br />
water depth for the nine sample months. From September to December, 2008 there are strong<br />
positive correlations (R 2 0.936 to 0.977) between adjusted depth data (tidal back flow depths<br />
removed from the dataset) and total discharge. Weak correlations exist between total discharge and<br />
water depth from January to May, 2009 (R 2 = 0.074 to 0.5372). This could be a result of algae<br />
growth and/or debris build-up on the screen of the pipe that houses the transducer and/or ice buildup<br />
on the shoreline affecting representative water depths and/or affecting how discharge is<br />
distributed into the tailpond. Discharge data from the turbines and spillway will also be verified with<br />
<strong>BC</strong> <strong>Hydro</strong> to ensure that flow monitoring was accurate during this period.<br />
09/03/09<br />
19/03/09<br />
29/03/09<br />
08/04/09<br />
18/04/09<br />
28/04/09<br />
08/05/09<br />
18/05/09<br />
28/05/09
Change language