SWAT Model Recalibration - Tetratech-ffx.com

Beaver Lake SWAT Modeling Baseline Analysis February 12, 2009The precipitation data were surveyed for completeness and errors. Small periods of data were patched byusing data from the next closest station, or the second closest station if necessary. The Fayetteville serieshad many data gaps; the worst gap was from October 2003 to February 2006. Data from Eureka Springsand Huntsville were used to replace missing data in the Fayetteville series. The monthly precipitationdata from the additional period (2004 through 2006) are shown in Figure 4.12.0010.00Inches/Month8.006.004.002.000.00Jan-04 Jul-04 Jan-05 Jul-05 Jan-06 Jul-06DateEureka Springs Fayetteville Huntsville MountainburgFigure 4. Monthly Precipitation for 2004 through 2006Figure 5 shows the annual rainfall at each station for each model year (1995 through 2006). The 30-yearhistorical averages (1971-2000) for each station are displayed as lines. Mountainburg regularly getsapproximately five more inches of rain per year than the other three stations. From this graph, it appearsthat all stations were significantly lower than their historical averages in 2005.10