Collection search - Fort Frederick. Sketch showing in blue the proposed surface drain and in red the proposed brick barrel drains to carry off water from the parade. The drains have a fall of 1" to 10 feet, the points are 2'1" below the crest of the counter-scarp. To accompany Lieut. Col. Fenwick's Report to Comg. Royl Engr. dated 22nd Sept. 1847. [architectural drawing]

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