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<br />r- <br /> <br />'-,' <br /> <br />..~ <br /> <br />Grass Valley Ditch <br /> <br />Grass Valley Ditch has, in the past, been out of service <br /> <br />frequently due to breaks. Most of these have occurred at three <br /> <br />locations where the side-hill is sliding slowly, carrying the <br /> <br />canal with it. All three slides a~pear to be the result of <br /> <br />disintegration and slipping of shale strata, caused, probably, <br /> <br />by the softening and lubricating effect of seepage from the <br /> <br />ditch, aggravated no doubt by the entrance of surface water <br /> <br />through the cracks which are constantly opening as sliding <br /> <br />takes place. <br /> <br />It is proposed to stabilize all three slide areas. At <br /> <br />the upper and lower slides it is proposed to install flexible <br /> <br />steel pipe on temporary wooden supports across the areas. It <br /> <br />is believed that this will prevent entrance of water to the <br /> <br />shale strata and result eventually in stopping the slides. <br /> <br />The pipe would be laid only slightly below canal grade and <br /> <br />would be jacked up at intervals as required to compensate for <br /> <br />the settlement of the slide area. ~t the central slide, a <br /> <br />41 <br /> <br />3#. <br />