Water quality modeling in the watershed-based approach for waste load allocations

The conventional method for waste load allocations (WLA) employs spatial-differentiation, considering individual point sources, and temporal-integration, using a constant flow, typically 7Q10 low flow. This paper presents a watershed-based seasonal management approach, in which non-point source as w...

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Bibliographic Details
Published in:Water science and technology 1998-01, Vol.38 (10), p.165-172
Main Authors: Gu, Ruochuan, Dong, Mei
Format: Article
Language:English
Subjects:
Allocations
Applied sciences
Case studies
Continental surface waters
Data processing
Design engineering
Differentiation
Discharge
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Load distribution
Loading rate
Low flow
Management
Mathematical models
Methods
Modelling
Natural water pollution
Nonpoint source pollution
Platinum
Point source pollution
Pollutant load
Pollutants
Pollution
Pollution load
Pollution sources
Pollution, environment geology
Projection
Quality assurance
Quality control
River flow
Rivers
Surface water
Waste load
Wastes
Water pollution
Water quality
Water quality control
Water treatment and pollution
Watershed management
Watersheds
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Summary:The conventional method for waste load allocations (WLA) employs spatial-differentiation, considering individual point sources, and temporal-integration, using a constant flow, typically 7Q10 low flow. This paper presents a watershed-based seasonal management approach, in which non-point source as well as point sources are incorporated, seasonal design flows are used for water quality analysis, and WLA are performed in a watershed scale. The strategy for surface water quality modeling in the watershed-based approach is described. The concept of seasonal discharge management is discussed and suggested for the watershed-based approach. A case study using the method for the Des Moines River, Iowa, USA is conducted. Modeling considerations and procedure are presented. The significance of non-point source pollutant load and its impact on water quality of the river is evaluated by analyzing field data. A water quality model is selected and validated against field measurements. The model is applied to projections of future water quality situations under different watershed management and water quality control scenarios with respect to river flow and pollutant loading rate.
ISSN:0273-1223
1996-9732
DOI:10.1016/S0273-1223(98)00746-X