Radiometric dating is based on what mineral property

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All Bristols rivers drain to the River Avon, which in turn flows into the Severn Estuary.

Since the latter has the second highest tidal range in the world (the highest is in the Bay of Fundy by the way) this creates further drainage problems for the city.

The alternative, trinitrotoluene (TNT) was expensive to make so a mix of TNT and ammonium nitrate, called Amatol and which could be poured, was adopted instead.

In August 1915, the 8th Viscount Chetwynd, an engineer, was tasked with building a factory to fill large shells with Amatol. It had good transport links, but a shortage of skilled workers necessitated an appeal for women, despite Chetwynds view that this was no job for a woman.

Over the centuries Bristolians have altered the Fromes course, blocked it, channeled it, used it as a defence, a harbour, a sewer, and finally buried most of the urban section in culverts.

The danger of grounding that the extreme tidal range posed to shipping caused a decline in Bristols importance as a port.

Though none of the schemes were completed, several lengths of canal survive today in leisure use, and abandoned sections add to the region's rich industrial archaeology.

The Dorset and Somerset Canal was intended to link the Kennet and Avon Canal with Poole in Dorset, but only the Nettlebridge branch was started, only to be abandoned in the 1880s.

In 1825 the Mylnes Culvert was constructed to take this flow under the Floating Harbour to discharge into the New Cut.

Major schemes have continued in the 200 years since.

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