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<br />5 <br /> <br />Table 1. Comparison of the Morphometry of A-7 and A-I0 <br /> <br />Parameters A-7 A-lO <br />Maximum surface area 30.35 ha 12 .34 ha <br />Maximum effective length a 2.72 km 2 . 51 km <br />Length of main channel 3 . 17 km 2. 74 km <br />Length of shoreline 12.31 km 7 . 4 3 km <br />Shoreline development 6.30 6.10 <br />Maximum depth 4 .00 m 4.00 m <br /> <br />a. Longest linear distance over both land and water. <br /> <br />end. In A-I0 I water directly enters the backwater through one culvert <br /> <br /> <br />and leaves through another I each located at the extreme ends. Another <br /> <br />culvert connects the upper and lower portions of A-I0 which are divided <br /> <br /> <br />by a levee located below the middle portion of the backwater. All of the <br /> <br />culverts are 91 cm (36 inches) in diameter. The direction of the flow at <br /> <br />most of the inlets and outlets of both backwaters changes when the water <br /> <br />in the river is extremely higher or lower than in the backwaters. Water <br /> <br />may also flow into and out of the backwaters from seepage through those <br /> <br />banks adjacent to the river. <br /> <br /> <br />The water levels in A-7 and A-IO depend on the elevation of <br /> <br />the river water which is controlled by the Palo Verde Diversion Weir <br /> <br /> <br />located 24.2 km upriver from A-7. In spring and summer I for irrigation <br /> <br /> <br />demands I more water is released from the weir during the day than at <br /> <br />night. This causes the water levels in the backwaters to fluctuate as <br />