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Basin C: <br />10/9/15 Update: There have been no apparent changes to the downstream system <br />since the first analysis in 2005/2006. <br />The stormwater runoff from Basin C flows in a northeasterly direction. The majority of <br />the basin flows exit the site in a steep ravine that intersects the northern property line in <br />the northeast region of the site. This ravine has signs of surface flow at the low point of <br />the swale. The swale travels north onto private property and is crossed by a residential <br />concrete driveway. The residential driveway has a drainage ditch on the uphill side, <br />which drains any run-on flows. Approximately 150' from the intersection of the ravine <br />and the concrete driveway, the ditch is rock lined. Also, there is a catch basin which has <br />a 12" PVC pipe entering and exiting. <br />This ravine diverged from the driveway and was approximately 15' below the driveway <br />and had running water. The creek edges appeared to be outwash sand, with the creek <br />bottom being composed of sands and gravels. <br />soundview <br />Preliminary Downstream Analysis <br />