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If a single data block stores several sequence numbers and if more than one instance needs those sequence numbers , then the data block can be frequently transferred among the instances . The use of Non-Volatile Memory , such as Compact Flash or Secure Digital data cards , is mandatory for storing data files in the field . Model experiments are conducted to gain data on the basic mechanisms of the build-up of soil bound residues . Some recommended data elements , if populated , also must include a subset of mandatory data elements associated with that recommended data element . It incorporates a map-based user interface for site selection ; a Microsoft Access database that contains information for data-collection stations ; a GIS program that delineates drainage-basin boundaries and measures physical and climatic characteristics of the drainage basins ; and a GIS database that contains land elevation models , historic weather data , and other data needed for measuring drainage-basin characteristics and for locating sites of interest in the user interface .