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sub-basin scale map of drainage areas. The original data was received over the Internet at 250k <br />resolution. Two other coverages, elevation and hydrography, were populated at 100k. When using <br />these coverages together either for plotting or data analysis, the lower resolution of the Hydrologic <br />Units coverage became an issue. Therefore, using the elevation contour lines at 100k resolution and <br />the hydrography at 100k resolution, the boundaries for the sub-basins defining each Hydrological <br />Unit boundary line were improved to reflect the same resolution as the elevation and hydrography <br />coverages. <br />Maintain the CRDSS Relational Database <br />Although the CRDSS relational database was constructed and populated under other tasks, the <br />purpose of this task was to assure the continued proper and efficient operation of the INFORMIX <br />database software. The CRDSS database was backed up each business day. A full backup was <br />performed each Friday, while incremental backups were performed on the other business days. <br />Tapes containing the full backups were retained for 3 months before being returned to the rotation <br />scheme. Database administration activities were performed as necessary, including setting up new <br />users, maintaining current users, managing database security, tuning database engine performance, <br />and managing disk space and dbspace. The INFORMIX relational database software was not <br />updated during this phase; however, updates and patches to INFORMIX database utility programs <br />were applied as necessary to maintain the proper operation of the database. <br />The CRDSS database is currently running with the INFORMIX Online 5.0 database server, while the <br />current version of the INFORMIX OnLine Dynamic Server is 7.2. The current version is not just an <br />improved revision of the 5.0 server; several new technologies have been incorporated into the new <br />server that make this a new and different product. Upgrading to the current INFORMIX server <br />software is not recommended at this stage because technical support from INFORMIX is still <br />available for the 5.0 server. Furthermore, the advantages gained from new technologies in the 7.2 <br />server are probably not justifiable given the current hardware and size and design of the CRDSS <br />database. In addition, other State efforts are using the 5.0 database server software, and maintaining <br />compatibility with those efforts is a consideration before upgrading. <br />Prepare a Task Memorandum to Describe and Summarize the Task Activities and Results <br />This subtask involves preparing a memorandum and the necessary documentation, including <br />appropriate sections in the CRDSS Users? Manual and the CRDSS Developers? Manual . <br />2 <br />a320/taskmems/ 2-13-02.doc 01/03/97 <br />