Rain and storm for Cpt

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Garden looks like a war zone. Leaves everywhere and water blew in under the front door. Lucky we put a towel down last night. It's soaked.
 
Gordon_R said:
The giant Theewaterskloof Dam is the major catchment for the area that received maximum precipitation. The DWS chart shows the level went from 103% to 110% of capacity in 18 hours, and is still rising fast:
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What is the implication down river?
 
The_Mowgs said:
That's A LOT of water!
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Wikipedia has some numbers for Theewaterskloof Dam, and the ratio of catchment area (500km^2) to reservoir volume (0.48km^3). About 10mm of rainfall as runoff will raise to dam level by 1%. To raise the level by 7% overnight requires at least 70mm across the entire catchment area (a mixture of lowlands and mountain peaks). This is actually consistent with the forecasts, which predicted 100-120mm in the area.

Reference: https://en.wikipedia.org/wiki/Theewaterskloof_Dam

ajax said:
What is the implication down river?
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No idea. The Riversonderend basin is millions of years old, and the dam is barely 50 years old, so the dam has no substantive effect on the peak flow rates. Mostly areas encroaching on the river banks may be affected, particularly those that have grown during prolonged dry spells.
 
Sand/Flooding on Beach Rd, Strand

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