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<br />"J~"i<:i11 <br />(J' 1 U ~. <br /> <br />III. Information Used to Develop and Support the Channel Maintenance <br />Claims <br /> <br />This section of the Report describes the information collected in suppon of the claims. <br />data collection procedures and analyses conducted. <br /> <br />A. Streamflow Records <br /> <br />Stream discharge data were used for a variety of purposes. Instantaneous stream <br />discharge data were used in developing relationships between sediment transport rates and <br />stream discharge. Mean daily discharge data were used to develop the cumulative and efficiency <br />curves describing the relative amount of time, water and sediment associated with various stream <br />discharges. Annual instantaneous peak streamflow data were used for flood frequency analysis. <br />These analyses are discussed in later sections of the Repon. All streamflow data were reviewed <br />for accuracy and for adequacy for use in subsequent analyses. <br /> <br />Streamflow records are based on water discharge and water stage measurements collected <br />at gaging stations. A typical stream gaging station (Figure 3) includes instrumentation that <br />records the stage level of the water surface with respect to a known (surveyed) elevation. <br />Elevation is typically referenced to a staff gage where the water surface intersection with the <br />staff gage can be directly read as stage. Instrumentation is installed to measure and record water <br />stage either continuously or at set intervals (typically every 15 minutes). The instrumentation is <br />typically set to record water surface elevations at the staff gage. The staff gage is periodically <br />surveyed to determine whether corrections need to be made to the stage record due to staff gage <br />elevation changes. <br /> <br />United States' Expert Report Disclosing Methodologies for Quantification of Organic Ad Claims Consolidated Subcase No. 63-25243 <br /> <br />21 <br />