search

vicelab / cen-sierra-pywr

Code base for modeling the central Sierra Nevada hydropower systems
3 stars 5 forks source link

IFR bl Beardsley Afterbay Logic #62

Open drheinheimer opened 4 years ago

drheinheimer commented 4 years ago

It's unclear if a ramping rate constraint is needed here based on the FERC license IFR, but observed flows clearly indicate no ramping.

drheinheimer commented 4 years ago

I have added a ramping rate constraint based on observations.

alanccai commented 4 years ago

Gustavo has emailed the operator asking for clarification on this issue.

drheinheimer commented 4 years ago

The logic below Beardsley afterbay remains incomplete. From the license (P-2975):

Licensee shall discharge from the Beardsley Afterbay Dam a continuous minimum flow of 135 cubic feet per second (cfs), or inflow, whichever is less, in all years except those defined as dry years by the California Department of water Resources. During a dry water, licensee shall discharge from the Beardsley Afterbay Dam a continuous minimum flaw of 50 cfs. If, during a designated dry year, the February or later water predictions of the CDWR indicates that dry year conditions no longer prevail, a flow release of 135 cfs will resume immediately.

  1. It has not been confirmed that the CDWR dry year designation is specifically the 4-river SJVI.
  2. The SJVI is not checked on Feb 1. Instead, SJVI is calculated using the operational water year, which is updating on Apr. 1. So during Feb-Mar there may be some discrepancy between actual and modeled operations.

For now, this should be okay.