Name: Oxygen Enrichment and Oxygen Depletion (305(b))

Display Field: RAD305B_ALL_Water_Name

Type: Feature Layer

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Description: Dissolved oxygen in the water is essential for healthy waterways. Prolonged periods of low dissolved oxygen are harmful to most aquatic life and can cause fish kills and large dead zones (areas that can’t support aquatic life). Oxygen levels in the water change naturally, but severe depletion of oxygen is usually due to human activities that increase the amount of plant parts and animal and human waste in the water. This increase is known as organic enrichment. Algae and aquatic plants consume oxygen at night even in healthy waters, and naturally occurring decay also lowers oxygen. When excess organic matter enters the water and decays, it depletes the oxygen below levels that fish and other aquatic life forms need to survive. Some types of chemical pollutants also decrease oxygen in water and have similar effects. Oxygen depletion can be caused by runoff of chemical and manure-based fertilizer applied to lawns and croplands, septic or untreated sewage overflow, animal wastes from livestock farming and pets, and industrial waste, such as discharges from pulp and paper mills. Reservoirs and activities that involve straightening streams can also cause oxygen-poor waters because they mix the water less and decrease aeration. Prolonged high temperatures can also decrease oxygen since warm water cannot hold as much oxygen as cold water. Low dissolved oxygen and decay can cause foul smells and encouraging the growth of nuisance species, making waterfront properties and recreation unattractive. Around 6,000 waters have been reported in the organic enrichment/oxygen depletion category nationwide, making this the third most common impairment category, and several thousand more waters with nitrogen and phosphorus pollution or high temperature impairments also affect dissolved oxygen in waters. People can help avoid low dissolved oxygen problems in their local waters by never dumping plant or animal waste in a waterway, applying the correct amount of fertilizer on lawns and never before storms, disposing of pet waste in the trash, pumping out septic tanks regularly, and pumping boat waste to an onshore facility.

Copyright Text:

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• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Shape_Length ( type: esriFieldTypeDouble, alias: Shape_Length )
• MERGE305B_COMID ( type: esriFieldTypeInteger, alias: COMID )
• MERGE305B_PERMANENT_ ( type: esriFieldTypeString, alias: PERMANENT_, length: 40 )
• MERGE305B_EVENTDATE ( type: esriFieldTypeDate, alias: EVENTDATE, length: 8 )
• MERGE305B_REACHCODE ( type: esriFieldTypeString, alias: REACHCODE, length: 14 )
• MERGE305B_REACHSMDAT ( type: esriFieldTypeDate, alias: REACHSMDAT, length: 8 )
• MERGE305B_REACHRESOL ( type: esriFieldTypeSmallInteger, alias: REACHRESOL )
• MERGE305B_FEATURECOM ( type: esriFieldTypeDouble, alias: FEATURECOM )
• MERGE305B_FEATURE_PE ( type: esriFieldTypeString, alias: FEATURE_PE, length: 40 )
• MERGE305B_FEATURECLA ( type: esriFieldTypeDouble, alias: FEATURECLA )
• MERGE305B_SOURCE_ORI ( type: esriFieldTypeString, alias: SOURCE_ORI, length: 130 )
• MERGE305B_SOURCE_DAT ( type: esriFieldTypeString, alias: SOURCE_DAT, length: 100 )
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• MERGE305B_CYCLE_YEAR ( type: esriFieldTypeString, alias: CYCLE_YEAR, length: 4 )
• MERGE305B_START_DATE ( type: esriFieldTypeDate, alias: START_DATE, length: 8 )
• MERGE305B_END_DATE ( type: esriFieldTypeDate, alias: END_DATE, length: 8 )
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• RAD305B_ALL_Region ( type: esriFieldTypeDouble, alias: Region )
• RAD305B_ALL_Assessment_Unit_ID ( type: esriFieldTypeString, alias: Assessment_Unit_ID, length: 255 )
• RAD305B_ALL_Cycle ( type: esriFieldTypeDouble, alias: Cycle )
• RAD305B_ALL_Water_Name ( type: esriFieldTypeString, alias: Water_Name, length: 255 )
• RAD305B_ALL_Location ( type: esriFieldTypeString, alias: Location, length: 255 )
• RAD305B_ALL_Report_305_b_ ( type: esriFieldTypeString, alias: Report_305_b_, length: 255 )
• RAD305B_ALL_Map_305_b_ ( type: esriFieldTypeString, alias: Map_305_b_, length: 255 )
• RAD305B_ALL_Water_Status ( type: esriFieldTypeString, alias: Water_Status, length: 255 )
• RAD305B_ALL_Trophic_Status ( type: esriFieldTypeString, alias: Trophic_Status, length: 255 )
• RAD305B_ALL_Water_Type ( type: esriFieldTypeString, alias: Water_Type, length: 255 )
• RAD305B_ALL_Water_Type_Group ( type: esriFieldTypeString, alias: Water_Type_Group, length: 255 )
• RAD305B_ALL_Water_Size ( type: esriFieldTypeDouble, alias: Water_Size )
• RAD305B_ALL_Size_Unit ( type: esriFieldTypeString, alias: Size_Unit, length: 255 )
• RAD305B_ALL_Use_Desc ( type: esriFieldTypeString, alias: Use_Desc, length: 255 )
• RAD305B_ALL_Cause_Name ( type: esriFieldTypeString, alias: Cause_Name, length: 255 )
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• RAD305B_ALL_EPA_No ( type: esriFieldTypeString, alias: EPA_No, length: 255 )
• RAD305B_ALL_BIN ( type: esriFieldTypeString, alias: BIN, length: 255 )
• RAD305B_ALL_Storet_No ( type: esriFieldTypeString, alias: Storet_No, length: 255 )
• RAD305B_ALL_Expected_To_Attain_Year ( type: esriFieldTypeString, alias: Expected_To_Attain_Year, length: 255 )
• RAD305B_ALL_Monitoring_Scheduled_Date ( type: esriFieldTypeDouble, alias: Monitoring_Scheduled_Date )
• RAD305B_ALL_Miles_305_b_ ( type: esriFieldTypeString, alias: Miles_305_b_, length: 255 )
• RAD305B_ALL_Acres_305_b_ ( type: esriFieldTypeString, alias: Acres_305_b_, length: 255 )
• RAD305B_ALL_IR_Flag ( type: esriFieldTypeString, alias: IR_Flag, length: 255 )
• RAD305B_ALL_CurrentYear_Flag ( type: esriFieldTypeString, alias: CurrentYear_Flag, length: 255 )
• RAD305B_ALL_AssessedFlag ( type: esriFieldTypeString, alias: AssessedFlag, length: 255 )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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