PROGRAMS AND PLANS--Guidelines for the Analyses of Sediment Data In Reply Refer To: September 30, 1991 Mail-Stop 415 OFFICE OF SURFACE WATER TECHNICAL MEMORANDUM NO. 91.15 Subject: PROGRAMS AND PLANS--Guidelines for the Analyses of Sediment Data The sediment program is taking on an increasing importance in WRD because of its close association with water quality. At the same time, Surface-Water Reviews have noted that a wide range of procedures are being used to process sediment records. The purpose of this memorandum is to encourage more uniformity of quality and analyses procedures in working sediment records. This memorandum provides guidelines for the analyses of sediment data for publication in the annual data report or other forms of publication. These guidelines apply to the compilation of sediment data after the sediment samples have been analyzed in the laboratory. Data types include suspended sediment, bed material, bedload, and total sediment. The guidelines are attached and are provided for specific parts of the analysis as follows: --Station description --Sediment field notes (including a sample field-note form) --Sediment data processing --Sediment records requirements and review form --Station analysis --Publication format for sediment data The "Station description" section provides information on special documentation requirements for stations where sediment data are collected. The "Sediment field notes" section lists the types of information needed from the field. Sample field-note forms are provided as examples of note forms and can be copied directly or modified as needed for a particular use. The "Sediment data processing" section provides guidance on processing the data. It summarizes things to look for and activities to be considered when processing sediment data. The "Sediment records requirements and review form" provides a check list of items that need to be considered when analyzing a sediment record. The "Station analysis" section provides guidance and examples on the special needs for documenting the sediment record and its analysis. The "Publication format" section provides information on the sediment data to be published, the arrangement of records, constituent reporting order, and significant figures for reporting sediment and related data. It should be noted that sediment concentrations below 0.5 mg/L are no longer to be reported as 0 but are to be reported as <0.5. This memorandum does not address computerized sediment-computation programs. The use of programs that are, or become, available that are consistent with recommended computational procedures is encouraged. These guidelines are generally based on other reports, such as Techniques of Water-Resources Investigations and on various policy memorandums. The guidelines provided with this memorandum update or modify some of the guidelines given in previous Water Resources Division (WRD) reports or policy memorandums. In those situations, guidelines given in this memorandum supersede those of earlier dated WRD reports or memorandums. Charles W. Boning Chief, Office of Surface Water Attachments WRD Distribution: A, B, S, FO, PO