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<br />6.3A <br />Page 19 <br /> <br />Immediate steps shall be taken to control any condition which endangers <br />the levees and to repair the damaged section. <br /> <br />D. Reports <br /> <br />A detailed report on the inspection, operation, and maintenance of the <br />levees shall be submitted annually. The report shall include elements <br />such as inspection logs, flood-fighting activities during the period, <br />maintenance measures taken, date of construction and date of removal of <br />temporary repairs, date of permanent repairs, extent of vegetative and <br />rodent control, and fiscal statement of cost of maintenance and operations <br />for the period. Reports will be submitted to the Public Works Services <br />Director and kept on file by the City. <br /> <br />IX. Inspection and Maintenance Activities <br /> <br />A. Erosion <br /> <br />1. Types of Erosion: <br /> <br />There are several types of erosion that effect the levees. For example, <br />the slopes of any embankment can become eroded from rain runoff, as <br />shown in Figure 1 or by embankment overtopping, as in Figure 2. <br />Depending on the extent of the erosion, the level of protection provided <br />by the levee can be significantly reduced. In cases of embankment <br />overtopping during a flood, there may be a total failure of the structure. <br /> <br />A second type of erosion often seen on embankments is wave wash. <br />Under high water conditions, wave action can form long terraces along <br />the length of the embankment slopes. If additional material or bank <br />protection is not provided, the embankment will continue to cave as the <br />waves work their way farther into the slope. <br /> <br />A third type of embankment erosion is caused by the flow of water <br />within a river or channel. These flows can erode a channel bank or <br />levee, or undermine other flood control structures and cause them to <br />cave into the water. Bank caving or stream bank erosion can be a very <br />serious threat to the stability of a levee. It's critical that the riverward <br />bank be inspected for bank caving or erosion. If the river or stream <br />bank erosion or caving is observed to be moving in the direction of a <br />levee or floodwall, immediate action should be taken to stabilize the <br />banks. <br /> <br />2. Repair of Areas Damaged by Erosion: <br /> <br />All erosion gullies like those pictured in Figure 1 need to be repaired to <br /> <br />12 <br /> <br />April 2008 <br />