History of Portsmouth city to new developments such as Paulsgrove and Leigh Park. On 4 July 1968, an estimated 250,000 people witnessed the return of Alec Rose, a greengrocer in Osborne Road, after he completed his single-handed circumnavigation in "Lively Lady"; he was immediately knighted and made a Freeman of the city. 400 motor-boats, yachts, catamarans and canoes welcomed him into harbour. The University of Portsmouth gained university status in 1992 In 2003 erection was started of a 552 feet high Spinnaker Tower sited at Portsmouth Harbour, and celebrating the city's maritime tradition. Completed in 2005, the tower has twin concrete legs meeting
Optimum water content for tillage Optimum water content for tillage The optimum water content for tillage (OPT) is defined as the moisture content of soil at which tillage produces the largest number of small aggregates. The Optimum Water Content of soil is the water content at which a maximum dry unit weight can be achieved after a given compaction effort. A max dry unit weight would have no voids in the soil. If you were trying to compact a hard dry soil to make it more dense, you might want to get it wet. The OPT is the water content of the soil in which