Laserfiche WebLink
<br />032384 <br /> <br />increase in Glen Canyon Dam releases that were sustained at levels above 20,000 cfs for the <br /> <br />remainder of the summer months. This represented a different operational pattern to handle the <br /> <br />forecasted runoff than in 1983, which experienced similar hydrologic conditions. <br /> <br />B. Reclamation Monitoring Program <br /> <br />Table 1. Major Features of Monitoring Program Phases <br /> <br /> Phase I Phase 2 . Phase 3 Phase 4 <br />Frequency: <br />number of <br />stations 8 8 8-10 15-20 <br />Parameters Temp. Temp. Multiprobe Multiprobe profiling <br /> DO (Winkler) DO (Meter) profiling (T, SC, with datalogger <br />chemistry Major Ions Major Ions Major Ions Major Ions <br /> (Shipboard Nutrients <br />sampling 50 ft 50 ft 50 ft Variable <br />biological none none qualitative chlorophyll <br />sampling plankton phytoplankton <br />inflow none none selected sites selected sites <br />monitoring <br />tailwater none none below dam below dam <br /> <br />The Bureau of Reclamation initiated a water quality monitoring program on Lake Powell in 1964 <br /> <br />to gather information on initial water quality conditions and to observe changes as the reservoir <br /> <br />filled and matured. This program has continued to the present. Based on sampling frequency, <br /> <br />spatial resolution of measurements, and changes in instrumentation, four distinct phases of <br /> <br />monitoring activity can be identified (Table II-I). <br /> <br />From 1965 to 1971, monthly sampling of the Glen Canyon Dam forebay and quarterly surveys of <br /> <br />the entire reservoir for temperature and salinity characterized monitoring activity. Measurements <br /> <br />and samples were collected at 50-foot depth intervals at seven locations on the reservoir. <br /> <br />06/02/98 <br /> <br />DRAFT <br /> <br />Po . 7 of 62 <br />