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Exhibit 19(20) <br />UPLAND DIVERSION DITCHES <br />D18 and D26 <br />Potable Water Tank Area <br />Installation of the potable water tank interfered with ditch D18. About 575 feet of D18 <br />east of the potable water tank is no longer functional. To minimize the drainage area <br />flowing to Pond 7, D26 will be extended about 425 feet to the west to intercept most of <br />the drainage that was flowing to the affected section of D18 as shown on Map 13 Sheet <br />1. The extension of D26 to the west increases its drainage area by 1.26 acres. <br />Reclamation of 575 feet of D18 will add 0.47 acres to the drainage area for Pond 7. <br />The drainage area for D18 will be reduced by 1.73 acres. The following notes show <br />that these drainage modifications are not significant. <br />Notes: <br />1. Reclaimed drainage ditch D18 will have a curve number of 87. <br />2. The run -off from the 0.47 additional acres flowing to Pond 7 with a curve <br />number of 87 and a storm event of 3 inches is 0.07 AF. <br />3. Pond 7 has a capacity of 9.2 acre feet (PAP Section 2.05.3(4)) so the addition of <br />0.07 AF is not significant. <br />4. A berm will be constructed along west side of the potable water tank to direct <br />drainage from the tank to Pond 7. <br />5. The drainage area for D26 increases by 1.26 acres as a result of this change. <br />6. D26 has a drainage area of 52.7 acres (Table 20). <br />7. The 1.26 acres of addition drainage area for D26 is not considered significant. <br />8. The 1.73 acre reduction in the drainage area for D18 is positive. <br />The information press <br />and the information p <br />ENGINEER'S CERTIFICATION <br />fired by me during the month of March 2012, <br />rrect to the best of my knowledge and belief. <br />• � � 1 3 � *' <br />Ja '�, Stover, *i,, <br />Registered gineer <br />State of Co1'df & 19230 <br />MR -111 Page EXH. 19(20) -1 <br />Date <br />03/23/2012 <br />