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�e dcwncutting was n the -71- c,a^ 4 the <br /> Culvert D-3 outfall . <br /> 11 . Several hundred feet downslope form the D-3 outfall , the drainage flow <br /> path coalesces with flow from an area of fill erosion in the vicinity of <br /> Sta. 47+00. This combined flow, designated Drainage B-5 on the Road A+B <br /> Drainage Map, washed out a segment of a reclaimed pilot road and caused <br /> severe gully erosion between the pilot road and Road B, at approximate <br /> Sta. 30+00, on Road B. Between the washed out pilot road and Road B, a <br /> distaice of approximately 100 feet, a bowl shaped erosional feature <br /> approximately 40 feet long, 30 feet wide and 15 to 20 feet deep has <br /> developed. Large rock, logs , culvert remnants and other debris has been <br /> deposited in this location. <br /> Road B <br /> 12. Active downcutting was noted in a 10 to 15 foot segment of the Culvert <br /> B-3 outfall channel . <br /> Road G <br /> 13. The outlet end of Culvert G-17 has rusted and some leakage is occurring <br /> approximately 5 feet in from the outlet. <br /> 14. The channel below culvert G-15 outfall is eroded intermittently from 1 to <br /> 4 feet deep for several hundred feet to the base of the steep hillslope <br /> below. <br /> 15. The 20 foot outfall section of Culvert G-14 has been riprapped and <br /> appears stable, however a gully up to 6 feet deep extends down the <br /> hillslope for approximately 50 feet below the riprap section. <br /> 16. At the culvert G-13 outfall , headward erosion has cut several feet back <br /> into the road embankment and measures need to be taken to prevent further <br /> erosion. <br /> 17. The Culvert G-12 inlet was 1 /2 full of sediment and requires cleanout. <br /> 18. At the 84" Culvert G-10, 1989 flooding and subsequent erosion has reduced <br /> the road width to approximately 15 feet. The culvert will probably need <br /> to be replaced with a low water crossing of some type or the road segment <br /> will need to be reconstructed and upgraded , depending on the intended <br /> future use of the road. <br /> 19 . At the Culvert G-8 inlet, a seeo is causing mud to ooze into the culvert, <br /> which is partially blocked . The seelp should be excavated and filled in <br /> with rock. <br /> -2- <br />