Errata Sheet

Open-File Report (OFR) 96-337

1. Two updates were included in the electronic copies of the OFR report (DDS-37) that do not appear in the paper and microfiche copies:

• In table 4 (p. 20) in the "Description of change" section for the constituent "trace elements" and the date "before 1991", a reference to memorandum QW90_13 was replaced by a reference to memorandum QW91_11.

• In table 5, memorandum QW92_08 ("Nutrient sample size reduction") was added.

2. In table 8 under the constituent "Nutrients", analyses of whole-water ("total") samples for nitrite, nitrate+nitrite, ammonia, and orthophosphorus (reference memo QW93_04) were discontinued beginning in 01-01-93 rather than the cited date of 10-01-94.

Digital Data Series DDS-37

1. In file QA_LAB.TXT under the constituent "Nutrients", analyses of whole-water ("total") samples for nitrite, nitrate+nitrite, ammonia, and orthophosphorus (reference memo QW93_04) were discontinued beginning in 01-01-93 rather than the cited date of 10-01-94.

Frequently-Asked Questions about DDS-37

1. How do I perform data searches by station or river name in GSSEARCH?

Logical queries can be made on all elements of the station name variable (STA_NAME), including river name, in the WQ_DATA.DAT file and all station information files except for WQ_STAS.DAT. Revised, executable code will be available soon that will allow all elements in this field in the WQ_STAS.DAT file to be searched.

2. What are the measurement units for instantaneous streamflow?

The units are the same as those reported for daily mean streamflow, cubic feet per second. A convenient listing of all 122 water constituents and their measurement units is available by clicking on the hypertext link "122 water constituents" located on the first WQN96 home page under the section entitled "Water Quality and Streamflow Data".