Again, considerable difference in the insertion of the piles must be made according to the contour the beach presents; between a distance continuously flat, and a shallow that only requires to be filled up. In the latter a few piles inserted from west to east, will answer extremely well; in the former, an opposite direction must be pursued; that is, from the north-west to the south-east, according to the accompanying plate, for the sweep of the water must be taken into consideration, and also the necessity for encouraging sea-beach materials to accumulate to the southward of a groin, as well as to the northward. Upon this our final success depends. While the above plan presents the least resistance to the tidal wave when most agitated, the tidal current will be checked and rendered powerless, and the gradual elevation, from the deposition of materials, will produce the effects exhibited by the breaking of the waves on a shelving shore; and, as they roll onwards, their power will become diminished, by wanting weight and depth to aid their motion. In several places on this beach, the sand, shingle, &c., do not exceed four feet in depth, and in some instances are still shallower; thus at Cromer, a large body of calcareous deposition exists, and projects above the beach at low water mark; but between that and the cliffs, now temporarily protected by a sea wall, a shallow or cavity of considerable length and depth must have existed: this induced the inhabitants, who had witnessed the good the jetty had effected (previous to the injury Cromer sustained, and alluded to in a former chapter), to insert a groin immediately to the southward, or rather westward, of the town, eighty-four yards in length. The shallow or cavity became filled up to the top of the groin, and a quantity of sea-beach material, consisting principally of sand, seemed disposed to accumulate against the base of the walls in June, 1844, but unfortunately the groin was not sufficiently extended towards the sea; the piles, instead of projecting above, did not equal in height the mound alluded to, and consequently it is not so efficacious as it would otherwise have been.