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Title: Asotin Creek ISCO Water Sample Data Summary: Water Year 2002, Annual Report 2001-2002.

The Pomeroy Ranger District operates 3 automated water samplers (ISCOs) in the Asotin Creek drainage in cooperation with the Asotin Model Watershed. The samplers are located on Asotin Creek: Asotin Creek at the mouth, Asotin Creek at Koch site, and South Fork Asotin Creek above the forks. At the end of Water Year (WY) 2001 we decided to sample from Oct. 1 through June 30 of each water year. This decision was based on the difficulty of obtaining good low flow samples, since the shallow depth of water often meant that instrument intakes were on the bed of the river and samples were contaminated with bed sediments. The greatest portion of suspended sediment is transported during the higher flows of fall and especially during the spring snow runoff period, and sampling the shorter season should allow characterization of the sediment load of the river. The ISCO water samplers collected a daily composite sample of 4 samples per day into one bottle at 6-hour intervals until late March when they were reprogrammed to collect 3 samples per day at 8-hour intervals. This was done to reduce battery use since battery failure had become an ongoing problem. The water is picked upmore » on 24-day cycles and brought to the Forest Service Water Lab in Pendleton, OR. The samples are analyzed for total suspended solids (TSS), conductivity, and turbidity. A total dissolved solids value is estimated based on conductivity. The USGS gage, Asotin Creek at the mouth, No.13335050 has been discontinued and there are no discharge records available for this period.« less
Authors:
Publication Date:
OSTI Identifier:
962971
Report Number(s):
DOe/BP-00005130-1
TRN: US200917%%428
DOE Contract Number:
5130
Resource Type:
Technical Report
Research Org:
Bonneville Power Administration (BPA), Portland, OR (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
13 HYDRO ENERGY; DRAINAGE; FORESTS; RIVERS; RUNOFF; SAMPLERS; SAMPLING; SEASONS; SEDIMENTS; SNOW; SOLUTES; STREAMS; TURBIDITY; WATER