models is the ease of use. These models are most accurate when calibrated for an

individual lake.

 Simple budget models focus on the mass-balance of a lake system. The most

basic of these models uses inflow, outflow and one-way removal to characterize the

system. These models provide a temporal response from the lake and can be easily

adapted for different lake dynamics. Simple budget models are highly sensitive to the

quality of input data. Therefore, they are best suited for long term trends or high quality

data sets.

 Nutrient and food web models are more complex models that aim to characterize

the temporal and physical aspects of matter throughout a lake or reservoir (Chapra and

Auer 1999, Page ?). These models require large amounts of data or assumptions and can

provide a more detailed analysis than previous models.

Reservoir and Lake Modeling in South Florida

 Empirical and simple balance models have been used in modeling CERP

reservoirs and the EAASR. USACE and SFWMD (2003) reviewed 16 water quality

models that predicted the uptake of phosphorus in lakes and reservoirs. DMSTA was at

the top of the review's shortlist of models that met the reviewed criteria. DMSTA 2

(Walker and Havens 2005a), an improved version of DMSTA, is a mass balance model

that is calibrated for CERP reservoirs. The model incorporates a first order kinetic model

with a background concentration or a water column and sediment transfer model.

 Wetland Solutions Inc. (WSI) developed water quality models to simulate 15

parameters of interest for a general CERP reservoir (WSI 2004). Each model was

calibrated for Florida lakes and reservoirs and can be applied in a spreadsheet. The

models include Eutromod (Reckhow 1979; Reckhow et al. 1992), the Vollenweider