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<br />the fire hydrant. Water flowed through the cracks faster than it could be put <br /> <br /> <br />into the trough. Photographs of the leakage are shown in Figure 9. <br /> <br /> <br />Results <br /> <br />17. This test demonstrated that a plastered block wall will resist a <br /> <br /> <br />higher head of water than the unplastered wall. This capability can be seen <br /> <br /> <br />from a comparison of the test results from block wall 1 (Figures 6-8) with <br /> <br /> <br />those from the tests of block wall 2 (Figures 10-18). The surfacing used <br /> <br /> <br />on block wall 1 allowed it to resist a water head of between 3 and 3-1/2 ft. <br /> <br /> <br />The particular surfacing material used in the test was inadequate for strength- <br /> <br /> <br />ening the block wall because it weakened, leaked, and began disintegrating <br /> <br />before the trough was filled. A stronger surfacing of water-resistant mate- <br /> <br /> <br />rial, such as coating 5 described in Table 1, will allow the block wall to <br /> <br /> <br />withstand a water head of at least 3-1/2 ft of water. This test also demon- <br /> <br /> <br />strated that the maximum deflection that will damage a block wall is very small. <br /> <br />Block Wall 2 <br /> <br />Experimental tests <br /> <br />18. The first test performed on block wall 2 was to partially fill <br /> <br /> <br />(approximately 1-1/2 ft) the trough to determine the leakage through the <br /> <br /> <br />block wall (not treated or protected in any way). The leakage through the <br /> <br /> <br />wall was severe and the test was stopped. <br /> <br />19. The second test evaluated vinyl sheeting attached with a tubular <br /> <br /> <br />seal and also determined the deflected shape of the wall. The third test on <br /> <br /> <br />block wall 2 was to again test the effectiveness of the tubular seal. The <br /> <br /> <br />tubular seal (Figure 19) was constructed as follows: <br /> <br /> <br />a. About one-third of the tube was cut away. The tube was epoxied <br /> <br />to the footing with the cut surface turned to the outside: <br /> <br /> <br />THE LENGTH OF THE SYSTEM TO <br />BE FLOODPROOFED. <br /> <br />9 <br />