CC PACKET 10131987 - Laserfiche WebLink

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The sidewalls, of the- flume are , -of eight inch thick concrete. - Their reinforcing is a layer of #3 bars at eight inch centers - (horizontally and vertically) -,placed on the inside face of the walls. The floor of the flume is , of 10 inch thickness. Its reinforcing is #3 bars at eight inch centers on the .inside face. The head and tail walls are of 1 ' -0" thickness with #3 bars at -eight inch centers as per the ' other surfaces'. . At select locations additional reinforcing steel has been placed to protect exposed corners. The flumes .walls are in poor condition. Spread over its length, the east wall has approximately 10 vertical full depth cracks of 1/4 to 1/2 inch thickness. The west wall has approximately the - same number. of cracks but of about 1/8" thickness. ' The east wall is bowed . inward badly, reaching a maximum bow where, an existing timber retaining wall butts into the flume wall. Apparently the timber delivers a significant force that has broken the wall . The west wall bows inward slightly. It should be noted that -the reinforcing steel in the walls is unusually light and -is placed in the wrong face of the walls to effectively resist earth pressure. The floor slab, headwall, and tailwall (where visible) all appear to be in fairly good condition. DESCRIPTION OF SITE The inlet structure is located at the extreme north end of Highcrest Road. . Both the road and -the longitudinal axis of the structure lie on a north-south line. The headwall of the structure is at the flume ' s south end. The topography, in moving north from the end of Highcrest Road, is of gentle slope for approximately 150 feet, then of a . sharp drop down to the water .-level of the detention pond. The flume is • located in the region of the sharp--drop. . The ground cover is of grass, brush, and. trees, depending on location.