SEDIMENT DATA- COLLECTION TECHNIQUES

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LOOK TO THE PAST FOR HELP• LOOK AT RECORDS FOR PREVIOUS YEARS.– How were storm peaks estimated?– What is the typical slope of sedigraph for the rising and fallinglimbs?– How much variation in samples? Is it within normal limits for thesite?– What is the expected variation in loads from season to season, orfor different types of runoff events?– Were coefficients previously used? If so, what were they and havethey changed?• REFER TO LAST YEAR’S STATION ANALYSIS.– Any special calculations needed?– Other considerations?
COMPUTE DAILY VALUESOF CONCENTRATION AND<strong>SEDIMENT</strong> DISCHARGE.• There are a variety of methods:– By manually subdividing (good luck!)– Spreadsheets (be careful of these).–*GCLAS (USGS approvedsoftware).
Page 1: SEDIMENT DATA-COLLECTION TECHNIQUES
Page 4 and 5: TechnicianField Note
Page 6 and 7: Observer Sample Log Sheet.
Page 8 and 9: MEANWHILE, BACK AT THEOFFICE……
Page 10 and 11: LAB DATA REVIEW• LOOK FOR UNEXPEC
Page 13 and 14: SURFACE WATER DISCHARGERECORD MUST
Page 15 and 16: Example ofa SedimentRecordsChecklis
Page 17 and 18: EVALUATE THE LAB DATA
Page 19 and 20: PLOT SAMPLES ON TIME-SERIESSTAGE OR
Page 21 and 22: TRANSPORT CURVE• Draw a best fitl
Page 23: DEVELOP TEMPORAL CONCENTRATIONCURVE
Page 27 and 28: Plot mean Daily Concentration mg/Lv
Page 29 and 30: STILL MORE STEPS• COMPARE WITH UP
Page 31 and 32: STATION ANAYLSIS- DESCRIBE THE SAMP
Page 33: ANY QUESTIONS??

SEDIMENT DATA- COLLECTION TECHNIQUES

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