A small-stream, bean & adhesive dam with waterfall.wmv

(As portions of the soundtrack are distorted by wind-across-microphone NOISE, begin playback at LOW VOLUME.) This video is an assemblage of 21 clips from different perspectives of a small dam and waterfall along a small natural stream.. The dam was completed on November 29, 2009. The peripheral areas still need stone walks, steps, and benches; and the waterfall pool walls need finishing touches. Work on the foundation began in mid-September 2008, but came to an early close when freezing weather arrived to stay in mid-October. At this point, two rough earthen coffer dams had been built up- and downstream of the dam site, to allow an area of relative dryness (ie, it wasn't completely underwater!) in which to work. This "dry" area required repeated pumping-out at intervals to make it "workable" (barely!), a situation complicated by springs leaking from the west (to the left when facing upstream) bank of the stream. A trench was dug from above the upper coffer dam to below the lower coffer dam along the east bank, and corrugated plastic drain pipe was installed to act as the water's bypass conduit around the foundation area. The foundation trench for the dam wall was dug through the mud and loose silt down to a naturally-compacted layer of stone and gravel. Large stones were piled into the trench until they formed a solid footing, then subsequent stones were laid in with mortar. By freezeup in mid-October 2008, the foundation wall had been built up along its length to ...



http://www.youtube.com/watch?v=aUpcJRI1NyE&hl=en

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