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Urban Water Qualitv and Fertilizer Ordinances:Avoidina Unintended Consequences:A Review.... 14 <br /> 4 ' Pensacola 4 Tallahassee 4 Jacksonville <br /> 3 3 3 <br /> 2 2 2 <br /> iI 1 I, I � I I ' fI <br /> II II <br /> 0 o a , <br /> JFMAMJJASOND JFMAMJJASOND JFMAMJJASOND <br /> 4 Tampa 4 Orlando 4 Melbourne <br /> 3 3 3 <br /> 1o I . 1 1 1 � I � Iil 1 1 <br /> o ,Iil a � o d <br /> JFMAMJJASOND JFMAMJJASOND JFMAMJJASOND <br /> 4 Fort Myers 4 Key West 4 Miami <br /> 3 .3 : 3 <br /> 2 2 2 <br /> fl 1 III <br /> JFMAMJJASOND JFMAMJJASOND JFMAMJJASOND <br /> Figure 4.Mean number of rainfall events greater than 1 inch(CLIM20,2004). <br /> water-holding capacity is already filled by prior rain in excess of the soil's water-holding capacity. <br /> or irrigation.Sandy soils that are present in most Homeowners should be educated more about not <br /> urban areas in Florida only hold from 0.7 to 1.0 fertilizing immediately before a heavy rainfall event. <br /> inches of water per foot of soil.Up to 25%of P Education should also focus on not irrigating when <br /> fertilizer was lost in runoff and leaching when applied the soil already is at its water-holding capacity. <br /> to saturated soils(Linde and Watschke, 1997).This <br /> illustrates the importance of careful irrigating so as Issue#4 What role does irrigation <br /> not to keep the soil saturated.Following irrigation management play the leaching and runoff <br /> n <br /> BMPs throughout the year helps minimize the of nutrients? <br /> negative impacts of these natural leaching rain events. Irrigation accounts for nearly one-third of <br /> During the year there are rarely more than 2 or 3 residential water use in the United States and this <br /> rainfall events of more than 1 inch,considered to be a amount is greater in warmer climates(Mayer et al., <br /> significant rainfall in any month at any location 1999).Romero and Dukes(2010)studied irrigation <br /> (Figure 4).Only about 10-15%of rainfall events in water use in southwest Florida.While the average <br /> Florida are 1 inch or more(i.e.,those most likely to irrigation closely matched the calculated irrigation <br /> result in nutrient leaching or runoff)(Figure 5). need,they found over-irrigation was commonplace in <br /> Additionally,leaching or runoff occurs not simply some cities.On average 53%of the irrigating <br /> because of"heavy"rainfall but because the rainfall is households accounted for nearly all of the <br /> 13 �l <br />