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In .looking down . : on, the', flume site, the. ..hill line changes <br /> direction at-.the flume, thus .there is a crowding in of the hill <br /> along the east sidewall of the structure. <br /> The.- hill. all - around the structure is steep. Immediately. at the <br /> site, there exists tiers of old timber retaining wall that- are - in <br /> extremely poor condition. Apparently these' walls were left in <br /> place from a prior flume construction. <br /> Approximately' 20 feet south and above the headwall ' of the flume <br /> there is a hole formed by the drainage of the storm waters of <br /> July 23rd. Apparently flowing ground water has, over the years, <br /> formed an underground cavity here. The large volume of surface <br /> water from- the storm apparently broke into the cavity and carved <br /> a channel down to the flume structure. The flow broke out of the <br /> ground at about the mid-length point of the. east sidewall . There <br /> was sufficient force in the water to erode a washout of about 4 <br /> foot by 10 foot plan dimensions. <br /> The pond at the present time is at such , a level that the basin, <br /> at the discharge end of the flume, cannot be viewed. <br /> Theoretically, - it is of riprap pavement of sufficient size to <br /> assure its still being in place. <br /> As of the date of our inspection, there was a large volume of <br /> water flowing out of the washout at the east sidewall . It <br /> appeared that more water was flowing from the washout than from <br /> the storm sewer. pipe..- <br /> RECOMMENDATIONS FOR REPAIR <br /> The immediate problems with the inlet flume are problems of the <br /> site. A washout condition has been created- that, if allowed to <br /> continue, could collapse the flume. The flumme is riot. in • good- <br /> condition at the present time, and, because of the nature of its <br /> design-, -- the structure does not lend itself to satisfactory <br />