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<br />Table 4 <br /> <br />Ralston Watershed <br />One. and Six. Hour Rainfall Depths <br /> <br /> Design Rainfall Depth <br />Basins Time Design Frequency <br />Interval (Years) <br /> 10 50 100 500 <br />Western and Central Basins I Hour 1.30 2,00 2,20 2,80 <br /> 6 Hour 1.85 2,60 2,80 3.45 <br /> <br />Central and Eastern Basins <br /> <br />I Hour <br />6 Hour <br /> <br />1.55 <br />2.10 <br /> <br />2,20 <br />2,90 <br /> <br />2.40 <br />3,20 <br /> <br />3,00 <br />4,00 <br /> <br />Eastern Basins <br /> <br />I Hour <br />6 Hour <br /> <br />1.75 <br />2.45 <br /> <br />2.40 <br />2.45 <br /> <br />2,65 <br />3,75 <br /> <br />3,25 <br />4,70 <br />