Census information for Amherst (Buffalo County, State of Nebraska). Contains: population counts from the 2010 Census and estimated counts up to 2016, Population Rings and much more.
Please try again later. This is the end point of a 70ft french drain constructed with 6in Multi-Flow product encased in coarse sand. The water is flowing into a 4inch PVC pipe via a tee connection. There is already some flow in the 4inch PVC from the upstream downspout lines that run under the french drain line. 1  Film & Animation.
In some situations, a French drain facilitates water drainage. A French drain is a ditch-like trench, that is filled with rock or gravel. The rock should round the top, preventing soil from covering the drain. The trench must slope at least 1-3% and flow to an outlet. [Figure 1]. Figure 1.