Governor Bond Lake TMDL
Final Report 39 September 2002
Except for the CRP estimate in the land use section (15.7 percent of cropland) and shoreline stabilization,
effectiveness, exact acreage, and amount of each BMP are not known at this time.
9.1.4 BMP Recommendations:
Combinations of cultural and structural BMPs are possible to reduce loads to target levels (94 percent
reduction in nutrients, 89 percent reduction in NVSS). It is important to include cultural BMPs in
implementation, such as conservation tillage and/or CRP, because longevity and effectiveness of
structural BMPs will be enhanced by cultural BMPs, even though total reductions may not be as
significant.
These removal rates are based on average effectiveness of these BMPs. In this watershed, however,
average rates may not be practically attainable. Consequently, additional BMPs are recommended to
maximize the possibility of TMDL goal attainment. Other combinations are also possible, and exact
reduction rates will depend on BMP design, siting, and other watershed characteristics.
Nutrient BMPs
The combination of the following BMPs results in a reduction of 94.6 percent of TP load to the lake
• 33.5 percent reduction through aeration, sediment sealing, or system flushing (90 percent
of internal load)
• 20 percent reduction of external load due to cultural practices (primarily through CRP and tillage
and nutrient management practices)
• 70 percent reduction of external load due to buffer strips
• 65 percent reduction of external load due to ponds or wetlands
Additional recommended BMPs
• Septic system maintenance and design. Include sufficiently large drainfield, assure that soil
filtration properties are sufficient, and add setback requirements of at least 75 feet from the
shoreline to construction permits. Replace failed systems with systems that comply with new
requirements.
• Lawn management. Develop lawn chemical management guidelines for homeowners near the
lake. Educate homeowners on proper use of lawn chemicals and their effects on water quality.
Sediment/NVSS BMPs
The above combination of BMPs will also result in a 92 percent reduction in sediment/NVSS
• 20 percent reduction due to cultural practices
• 75 percent reduction due to buffer strips
• 80 percent reduction due to ponds or wetlands
Additional recommended BMPs
