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<br /> <br />o Two layers of brick will allow a brick wall to support greater water <br />depths. <br /> <br />o The tubular seals are difficult to make watertight and, if not im- <br />proved, will be too unreliable. <br /> <br />In the development of a system for reducing the flow of water through <br />walls, testing performance before determining reliability is a crucial step. <br /> <br />43 <br />