The classification codes and descriptions are broad subject headings that are specific to various databases. The codes appear in the Classification, CL=, field in an IDS record, e.g.:

CL : Classification

             AQ 00007 Industrial effluents

Each code is prefaced by another two-character code AQ that indicates the Aqualine database.

To find a suitable code to use when searching the Aqualine database, use the "Find" feature on your browser and look for relevant words. When you have found a code, you can search for these by entering them in the "Words in any field" query box, e.g.:

Cl=00007
Cl=00001

The database has 8 main divisions. General scope notes of each division are listed.

00001 WATER RESOURCES AND SUPPLIES
            Studies involving two or more phases of the water cycle: hydrologic models; rainfall-runoff relationships; atmospheric precipitation; flooding; surface and groundwater relationships; water conservation; watershed protection; legislation; water resources management; water demand; surface water; groundwater.

00002 WATER QUALITY
            Quality of surface waters and groundwater: pollutant pathways and fates including agricultural and municipal runoff; eutrophication; drinking water quality.

00003 MONITORING AND ANALYSIS OF WATER AND WASTES
            Instrumentation and techniques for the collection and analysis of water and wastewater: chemical analysis; physical measurements; remote sensing; biomonitoring (indicator species, microbiology); survey techniques; information center services.

00004 WATER TREATMENT
            Development and optimization of water treatment associated with municipal, industrial, agricultural, and recreational waters: treatment facilities; particulate removal; chemical and biological treatment; disinfection; ion exchange; organics and metals removal; membrane processes; water pollution treatment.

00005 UNDERGROUND SERVICES AND WATER USE
           Water services and water distribution: outfalls, water reuse, hydroelectric power generation; efficiency of irrigation practices; storage and distribution effects on water quality; pipelines; drainage or conveyance structures; tunneling and trenchless technology.

00006 SEWAGE
           Single or combined physical, chemical, and biological treatment processes which remove or modify impurities found in wastewater: primary, secondary and tertiary treatment processes; sludge treatment and disposal; storm sewerage; conventional purification methods; treatment for direct reuse; collection systems.

00007 INDUSTRIAL EFFLUENTS
           Industrial wastewater treatment processes: organic wastes; chemical wastes; metal-containing wastes; food-processing wastes; radioactive wastes; aquacultural effluents.

00008 EFFECTS OF POLLUTION
           Environmental impacts of water pollution: effects on public health; effects on aquatic organisms; toxicology; bioaccumulation; impacts on recreation.