Central Plains Center for Bioassessment

Lake Modeling Project - Part I

Will Spotts checking the autosampler
Date January 2001 - December 2003
Contact Debbie Baker
Location Kansas reservoirs


The four water quality problems that appear to be the most common in Central Plains lentic waterbodies are:

- Elevated plant nutrient levels and concurrent plant biomass increases;
- Elevated suspended solids levels and siltation that alter aquatic habitats and reduce light penetration, aesthetics, and waterbody depth and volume;
- Occurrence of elevated toxic chemicals, particularly pesticides;
- Objectionable taste and odor conditions

Due to the intensive agricultural activities of this region, excess nutrients and siltation most commonly contribute to eutrophication.

To address this concern, CPCB conducted a 30-month investigation into the regional application of watershed and reservoir models in estimating the potential effects of historic, current, and projected nutrient loads on reservoir eutrophication.

Several large watersheds and their reservoir systems were monitored, and these data were used to calibrate and validate the selected watershed model (AnnAGNPS) and reservoir model (BATHTUB). These project efforts addressed many of the regional TMDL (Total Maximum Daily Load) and nutrient criteria development needs related to identification of natural and anthropogenic nutrient levels and nutrient load reductions on lentic and lotic waterbodies in the Central Plains region.  The project has developed an integrated AnnAGNPS-GIS interface to assist decision makers to assess watershed and reservoir management plans.

See Lake Modeling Project Part II for continuation of this project.

Analysis, Results, or Reports

Executive Summary: Management of Nonpoint Source Pollution - An Interactive GIS-AnnAGNPS Model (Download .pdf document)

Users Manuals: GIS Interface for AnnAGNPS (pdf documents)
Volume 1 - Users Manual
Volume 2 - Procedures of Data Preparation
Volume 3 - Procedures of MUUF Data Conversion

Reports, Presentations, Proceedings Papers

Wang, S.H., D. Huggins, N. Lim, W.W. Spotts, A.R. Dzialowski. 2005. Predicting the effects of watershed management on the eutrophication of reservoirs in the Central Plains: An integrated modeling approach. Kansas Biological Survey, Lawrence, KS Report No. 123:104 pp.

CPCB, KBS, KU Geography. 2005. Extension for BATHTUB: ArcInterface User's Manual. Kansas Biological Survey, Lawrence, KS Report No. 122:35 pp. (pdf)

Predicting the Effects of Watershed Management on the Eutrophication of Reservoirs in the Central Plains - pdf presentation given at the 19th Annual Water and the Future of Kansas Conference, March 2002, Lawrence, Kansas.

Predicting and Controlling the Effect of Eutrophication in the Central Plains Reservoirs - pdf presentation given at the 2002 EPA Regional Conference, Kansas City, Kansas.

Cheney Reservoir Water Quality and its Watershed Assessment - KBS Report 112 (pdf document)
Two years (January 1997 – December 1998) of streamflow and water quality data collected in the Red Rock Creek watershed were used to calibrate and validate AnnAGNPS for the Cheney Reservoir watershed. Cheney Reservoir serves as the major source of drinking water for the City of Wichita. Because of increasing agricultural activities from its watershed, Cheney Reservoir has experienced degraded water quality problems. Currently, Cheney Reservoir is listed in the state 2002's high priority 303(d) of the Clean Water Act as a result of eutrophication and siltation.

Maps, Images, or Photos

From the "GIS Interface for ANNAGNPS User Manual" - adding a DEM (digital elevation model) to delineate a watershed.
Autosampler along a tributary of Clinton Lake.


Steve Wang

Donald Huggins