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Title: Oconee River Water Quality and Sediment Analysis
Authors: Willey, R. G.
Abbott, Jess
Gee, Michael
Keywords: Water quality
Sedimentation analysis
Oconee River Watershed (Ga.)
Publisher: Hydrologic Engineering Center (U.S.)
Abstract: This study of the water quality of the Oconee River Basin was conducted as part of the expanded scope Flood Plain Information {XFPI) study done by the Savannah District Anny Corps of Engineers. The Savannah District undertook this first pilot XFPI study in which geographic data banks were used as the basis for simulating watershed hydrology, and the computation of expected annual flood damages. Environmental considerations were also included in the original pilot study objectives but mainly for appraisal of wildlife habitat and tradeoffs between the desirability of certain land uses. The primary intent of the XFPI analysis was to analyze the effects of alternative futures of the Oconee River Basin development in a systematic manner such that realistic comparisons of flood hazards, flood damages, and environmental quality could be made between existing and alternative future watershed development patterns. After the viability of the XFPI geographic data bank methodology had been successfully demonstrated for flood hazard and damage computations, the Savannah District requested the HEC to perform an Oconee River Basin water quality study consistent with the XFPI objectives and methodology. Thus, the existing and alternative future water quality of the Oconee River, within the study area, would be simulated using the geographic data bank as the basis for land use inputs to existing HEC water quality simulation models. The Storage, Treatment, Overflow, Runoff Model {STORM) (1) would be used for determining the quantity and quality of land surface runoff and dry weather flow and the Water Quality for River/Reservoir Systems Model (WQRRS) [2] would be used to simulate water quality in the river network. That is, the land surface runoff from STORM would be input to WQRRS which would combine all inflows to the Oconee River and simulate the resultant river water quality. Some historical data about the water quality of the Oconee River Basin were said to be available but the extent and appropriateness of those data for these modeling purposes were not known. The HEC undertook the water quality studies expecting that the historical data would be satisfactory for model calibration for existing conditions. If some aspects of these data were not sufficient, then general experience from other water quality studies would be used to ascertain acceptable performance of the simulation models. The Savannah District also requested the HEC to study the land surface erosion simulation possibilities using the geographic data bank. In particular, it was desirable to erode and transport sediment on a grid cell basis as defined by the topography stored in the geographic data bank. A new computer program would be developed to implement this proposed methodology.
Description: Technical Report
Rights: Approved for Public Release; Distribution is Unlimited
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