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Station Analysis and Rating Documentation. Streamflow Record Computation using ADVMs and Index Velocity Methods Office of Surface Water. Documentation. Installation and configuration Routine field inspections Archival Spreadsheet rating documentation ADAPS Station description

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station analysis and rating documentation

Station Analysis and Rating Documentation

Streamflow Record Computation using ADVMs and Index Velocity Methods

Office of Surface Water

  • Installation and configuration
  • Routine field inspections
  • Archival
  • Spreadsheet rating documentation
  • Station description
  • Station analysis
  • Office QA/QC plan
installation documentation
Installation Documentation
  • Document all installation parameters and configuration settings
  • Use form in Appendix 2 of T&M Report
  • Also store a configuration log or script file when programming ADVM
routine field documentation
Routine Field Documentation
  • IV Gage Inspection Form
routine field documentation1
Routine Field Documentation
  • Describe the condition of cross-section
    • Are weeds, debris, scour, or fill at or near the site that affecting the flow?
    • Have the bank conditions changed (brush removed, heavy brush build-up, erosion)?
    • Taking pictures of the conditions is a convenient way to document conditions
  • Your office should have or develop an archival plan
rating workbook documentation
Rating Workbook Documentation
  • Document steps you took to develop rating!
  • Others will need to check your work
  • Examples:

“The range-averaged Vx had the highest R-square, lowest standard error, most significant p-values, and least pattern in residuals compared with other cells' Vx. Selected range-averaged Vx as the index velocity.”

“Stage area rating 1.0 was developed using a standard cross-section located 1 ft downstream of the OSS. The cross-section was measured on Mar. 15, 2010 and used BM 2 as the origin. Elevations to datum for each station were rounded to the nearest 0.1 ft and entered into the AreaComp program. Min expected gage height = 12.0 ft; Max expected gage height = 39.1 ft. Gage height during survey = 21.3 ft ”

rating workbook documentation1
Rating Workbook Documentation
  • Good to include site photos
rating workbook documentation2
Rating Workbook Documentation
  • Site sketch – equipment, survey monuments
class question
Class Question
  • What else could you document in the Rating Workbook?
  • Get all information into ADAPS
    • The parameter list can be long
    • Use 99968 for acoustic signal strength
    • Use 00055 for velocity
    • Use 99238 for cell end
    • For others use 999– parameters
station description
Station Description

Should include information to recreate the station if the ADVM is lost or moved.

  • ADVM configuration
    • ADVM type, frequency
    • Cell sizes, averaging interval, measurement period, etc
    • Get information from configuration log file
  • Exact location of the meter. An angle and distance from a reference mark may be helpful for this
station description cont
Station Description, cont.
  • The height of the meter (in gage datum) in case the mount fails
  • A screen shot of a typical beam check
  • Velocity profile
  • Cross-sectional area figure
  • Store in SIMS or RMS – depends on your office’s preference
station analysis
Station Analysis
  • Examples provided in Index-Velocity T&M Report, Appendix 8
    • Non-tidal station
    • Tidal station
  • Store in SIMS/RMS
station analysis1
Station Analysis
  • Document
    • Stage and velocity record quality
    • Occurrence and reason for any missing data
    • Gage height corrections
    • Datum corrections
    • Velocity shifts
    • Rating analysis and ratings used
    • Periods of estimated data
    • Hydrographic comparison (if done)
    • Overall record quality
elements of a good station analysis
Elements of a Good Station Analysis
  • Full documentation and justification for shifts
    • Are they supported by measurements?
    • Are they supported by an observed channel condition or data quality problem in ADVM?
  • Separate sections for gage height and velocity data
  • Data quality problems in velocity record: changing cell end, obstructions, biofouling, etc
  • Full documentation of measurements used for rating development vs. validation
qa qc plan
QA/QC Plan

An office QA/QC plan should include:

  • Installation recommendations
  • Field procedures
    • Beam amplitude checks
    • Clock syncs
    • Temperature checks
    • 1-minute data during Qms
    • Stage-area rating validation
  • File archiving procedures
  • Data QA procedures

An example QA/QC plan is provided with class materials