GC31P0M Pretoria Street Bridge - River Hop (Multi-cache) in Gauteng, South Africa created by TeamSpags

This cache has been archived.

Knagur Green: Due to no response from the CO after the request to maintain or replace the cache, I am archiving it to, stop it showing on the listings and/or to create place for the geocaching community.

The Geocache Maintenance guideline explains a CO's responsibility towards checking and maintaining the cache when problems are reported.

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If the CO feels that this cache has been archived in error please feel free to contact me within 30 days, via email or message via my profile ,quoting the GC number concerned

Thank you for understanding

Knagur Green
Groundspeak Volunteer Reviewer

GC31P0M ▼

A cache by TeamSpags Message this owner

Hidden : 8/9/2011

Difficulty:

Terrain:

Size: Size: small (small)

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Geocache Description:

The listed coordinates will take you to the Pretoria Street Bridge, the cache itself is hidden in the park nearby. We would recommend parking in Hilson Street (see parking coordinates in the additional waypoints) and taking a walk to the bridge and then to the final cache location.
Please be cautious when walking on the bridge and crossing Pretoria Street due to the high volumes of fast paced traffic.

The bridge was engineered by Dr E.J.Hamlin, the City Engineer for Johannesburg at the time. The following is some history on the work that he did during his time as City Engineer:

Prior to the 1930’s, the Klipspruit Sewage Farm was the only facility that Johannesburg possessed for handling its wastewater. Klipspruit served the whole area, much of the areas draining to the north being served by recourse to the pail system. Dr E.J.Hamlin, the then City Engineer, gave priority to sanitation, and sewage treatment plants were established in four of the north flowing stream valleys.

Dr Hamlin also recruited two top experienced professionals to plan and operate the system. These were Harold Wilson, a biochemist, and a civil engineer Harold Clausen, both from England.

The new works were named in alphabetical order according to Harold Wilson; Antea - the first; Bruma - a wet place in the Bible; Cydna - after the river Cydnus, which flowed into the Mediterranean Sea; and Delta - the 4th letter of the Greek alphabet.

The first of the northern basins to be tackled was the eastern basin which drained to the proposed Bruma Works in Kensington. In 1929 Dr Hamlin had initiated construction by contract just prior to becoming City Engineer. The surrounding residents were not very happy about a sewage purification works so near to them and at one famous public meeting Dr Hamlin drank a glass of purified effluent to demonstrate his complete faith in the stone trickling filter system.

Hamlin and Wilson both had experience of the Institute of Sewage Purification in England. Both were later elected as President of that organisation. They were keen to see a forum established under the auspices of this organisation where South African experience and problems could be discussed.

In order to find the coordinates for the final cache, you need to look for information on one of the 2 plaques on the bridge (the one written in English).

Count the number of full stops in the second last line, this is A. The year in which the bridge was built is B. The final coordinates are:
S 26 08.[(A*A*A)-7]
E 028 04.[B-1724]

Please be careful when doing the "River Hop" as the rocks can be slippery, we also wouldn't recommend doing this cache directly after heavy rainfalls.
Please replace the cache as you found it and cover its hiding spot with leaves, etc.

Sources:
WISA: Past and Present
eWISA Water History

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* We hope you enjoy this cache. (^.^)

Additional Hints (Decrypt)

5 oybpxf sebz gur gbc, oruvaq n oevpx. Ebhtuyl va yvar jvgu gur 6gu iregvpny jbbqra cbyr njnl sebz gur crqrfgevna oevqtr.

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)

This cache has been archived.

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Geocache Description:

The bridge was engineered by Dr E.J.Hamlin, the City Engineer for Johannesburg at the time. The following is some history on the work that he did during his time as City Engineer:

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Pretoria Street Bridge - River Hop Multi-Cache

This cache has been archived.

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Geocache Description:

The bridge was engineered by Dr E.J.Hamlin, the City Engineer for Johannesburg at the time. The following is some history on the work that he did during his time as City Engineer:

Attributes

Inventory

Bookmark Lists