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<br /> <br />Newly constructed one- <br />story dwelling on <br />concrete columns, <br />Oregon City, Oregon <br /> <br /> <br /> <br /> <br />This structure (Figure A 7) lies adjacent to the dwelling <br />previously described (shown in Figure A6). Flooding conditions <br />are similar. This new construction includes an open stairway, to <br />meet current county flood plain regulations. Such a stairway will <br />permit free passage of flood flows. The dwelling was designed by <br />a consulting engineer firm using design floodflow velocity of 8 <br />feet per second. Reinforced 12-inch-diameter columns on 5-foot- <br />square by l-foot-deep spread footing support the house. The <br />first-floor elevation is approximately 10 feet above the grade <br />slab. Water and sewer lines are attached to the concrete columns <br />and descend through the grade slab. <br /> <br />Figure A 7. One-story dwelling constructed on columns <br /> <br />26 <br />