Computer program estimate trend (ESTREND), a system for the detection of trends in water-quality data. Water Resources Investigation
Technical Report
·
OSTI ID:5404286
The purpose of the report is to document a software system for the analysis of time trends in water-quality data. The system, EStimate TREND (ESTREND), was initially developed to assist in the USGS investigations of trends in stream water quality. Certain statistical and operational issues such as (1) the choice of a statistical test for trend, (2) methods of adjusting for flow and seasonal variations, (3) the choice of a minimum number of observations for trend testing, and (4) the selection of water-quality stations are discussed in the report. Decisions related to these issues are based on methods investigations cited in the background section and experience from national and state-level trend investigations.
- Research Organization:
- Geological Survey, Reston, VA (United States). Water Resources Div.
- OSTI ID:
- 5404286
- Report Number(s):
- PB-92-147727/XAB; USGS/WRI--91-4040
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
COMPUTER CODES
COMPUTERIZED SIMULATION
DATA BASE MANAGEMENT
E CODES
ENVIRONMENTAL QUALITY
MANAGEMENT
SEASONAL VARIATIONS
SIMULATION
STATE GOVERNMENT
STREAMS
SURFACE WATERS
VARIATIONS
WATER QUALITY
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
COMPUTER CODES
COMPUTERIZED SIMULATION
DATA BASE MANAGEMENT
E CODES
ENVIRONMENTAL QUALITY
MANAGEMENT
SEASONAL VARIATIONS
SIMULATION
STATE GOVERNMENT
STREAMS
SURFACE WATERS
VARIATIONS
WATER QUALITY