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Iowa Lakes References
Book Reference

Rathbun Reservoir, Appanoose County

Neppel, J. G. (2001). Rathbun Lake Watershed assessment and water quality implications of switchgrass biomass production.
Rathbun Lake is a 4,455-hectare multipurpose water resource in southern Iowa. Its long-term ability to meet all of its designated uses is threatened by excessive siltation, nutrient enrichment, and pesticide runoff. A comprehensive watershed assessment is necessary to identify the sources and locations of these pollutants. The Soil and Water Assessment Tool (SWAT) was selected for this study. The two objectives were to: (1.) rank the 61 subbasins of Rathbun Lake Watershed as to their relative environmental impact on runoff water quality, and (2. evaluate the runoff water quality implications of using switchgrass for biomass production. The ArcView[Registered trademark symbol] SWAT interface version 1.601 was selected for this study. The ArcView[Registered trademark symbol] geographic information system (GIS) was desired to be used to demonstrate the utility of this technology and to automate the data entry workload. The digital elevation model (DEM), land use/land cover, and soils GIS coverages were obtained from government agencies. Weather, crop, fertilizer, and pesticide database information was supplied by the SWAT model or were obtained through literature review, subject matter experts, or existing site-specific databases. Management practice schedules were obtained by interviewing watershed farmers and local agency personnel familiar with farming practices in the watershed.
Land use distribution by subbasin was analyzed to obtain the maximum acreage of forest with the minimum number of hydrologic response units (HRUs). The soils threshold for the HRUs was selected based upon experience. Using average annual stream discharge, the model was calibrated for 1966-1986 and validated for 1987-1999. The model ranked the 61 subbasins on their relative production of sediment yield and nitrogen, phosphorus, and atrazine loading. In general, subbasins that ranked the highest had a high percent of row cropland and 4-5% average subbasin slope. Growing switchgrass for biomass was shown to have several environmental benefits. A switchgrass scenario defined as growing switchgrass on approximately 38% of the row crop area, reduced sediment yield and nutrient loading more than a third compared to the baseline (current conditions) scenario. The quantity of sediment-bound atrazine delivered to Rathbun Lake is predicted to be reduced 84%.

Mitzner, L. and Iowa. Dept. of Natural Resources. Fish & Wildlife Division (1995). Effect of environmental factors and harvest regulations upon the crappie (Pomoxis) sportfishery at Rathbun Lake, Fish and Wildlife Division Iowa Dept. of Natural Resources.

Mitzner, L. and Iowa. Fisheries Bureau (1988). Federal aid to fish restoration annual performance report : research investigations, project no. F-94-R-8, Iowa Dept. of Natural Resources Fisheries Bureau.

Weichman, M. and United States. Army. Corps of Engineers. Kansas City District. (1976). A preliminary archaeological, architectural & historical reconnaissance within the Upper Chariton River Valey, Appanoose County, Iowa and Putnam County, Missouri & An intensive survey of archaeological, architectural, & historical resources within the proposed Lodge Complex Project, Lake Rathbun, Iowa, s. n. ;.

Iowa Center for Regional Progress., Midwest Research Institute (Kansas City Mo.), et al. (1973). Feasibility of a state-regional resort complex system, phase II : Rathbun Lake, Iowa resort lodge complex : final report, The Center.

Rathbun Lake, Iowa.

Journal Reference

Rathbun Reservoir, Appanoose County


Record 2 of 3 in Biological Abstracts 1992 Part 1
SO: North-American-Journal-of-Fisheries-Management. 1991; 11 (4): 534-542..
IS: 0275-5947
AB: Abundance of juvenile crappies Promoxis spp. was positively related to floodwater storage in Rathbun Lake, Iowa, from 1972 to 1980. Regression analysis showed that age-0 crappies less than 15 d old increased by 1,330/acre for each million acre-feet-days of water stored above conservation pool from April through August. However, this relationship did not hold for data collected from 1981 to 1989. Abundance of crappies less than 15 d old was also positively related to numerical catch in the sport fishery 2-4 years later. Effects of temperature, wind, substrate, and turbidity on catch of age-0 crappies in townets from 1980 to 1983 were investigated. Once a spawning threshold temperature was attained, turbidity was influential in determining age-0 crappie densities. About 50% of the variability in larval crappie abundance was explained by turbidity, exclusive of water level. The relationship between substrate firmness and larval crappie abundance was best described by a parabolic function; moderate firmness was associated with highest crappie numbers. Wind was intercorrelated with substrate firmness such that windswept shores provided hostile spawning habitat both in terms of molar action and extremely hard substrate. The 150-mi shoreline at Rathbun Lake was classified to identify prime spawning areas and thereby provide a basis for preserving and enhancing crappie production areas at the lake.
AN: 199293098277

Record 3 of 3 in BA/RRM on CD 1/92 - 12/92
TI: Evaluation of walleye fingerling and fry stocking in Rathbun Lake, Iowa.
LA: English


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