Noteworthy

Local Science Feature:

•  Indiana: Investigations & Monitoring of Mercury

National & Regional Science:

•  Quality of Water from Domestic Wells

Past listings...

Water Quality Data

National Water Information System (NWIS)

• NWIS provides current and historical water-quality data.

Today's Water Conditions

• Water-Quality Watch provides continuous real-time water-quality measurements.
  

Water-Quality Web Services

• Web services automate the sharing of USGS and USEPA water-quality monitoring data.

For More Data

• Additional water-quality data resources are available.

USGS in Your Area

USGS Water Science Centers are located in each state.

Chapter A7. Biological Indicators

National Field Manual for the Collection of Water-Quality Data (TWRI Book 9)

7.0 Five-Day Biochemical Oxygen Demand

By G.C. Delzer and S.W. McKenzie

This section of Chapter 7 is available as a pdf file:
Five-Day Biochemical Oxygen Demand (11/2003) (360KB PDF)

Download a copy of Adobe Acrobat Reader for free.

Abstract

The presence of a sufficient concentration of dissolved oxygen is critical to maintaining the aquatic life and aesthetic quality of streams and lakes. Determinng how organic matter affects the concentration of dissolved oxygen (DO) in a stream or lake is integral to water-quality management. The decay of organic matter in water is measured as biochemical or chemical oxygen demand. This report describes the field protocols used by U.S. Geological Survey (USGS) personnel to determine the five-day test for biochemical oxygen demand.

Contents

7.0 - Five-day biochemical oxygen demand

7.0.1 - Equipment and supplies<

7.0.2 - Sample collection and storage

7.0.3 - Five-day test for biochemical oxygen demand

7.0.4 - Calculations

7.0.5 - Troubleshooting

7.0.6 - Reporting

Comments/Errata page

Return to Chapter A7 Biological Indicators Table of Contents

Return to Field Manual Table of Contents

Citation for Section 7.0

Delzer, G.C., and McKenzie, S.W., November 2003, Five-day biochemical oxygen demand: U.S. Geological Survey Techniques of Water-Resources Investigations, book 9, chap. A7, section 7.0, accessed __list date__, from http://pubs.water.usgs.gov/twri9A/.