Old soakaway does not empty

[gerand01]

The house is about 250years old. Rainwater goes into a chamber which is close to the rear of the house and at least 4 metres deep and about 3m by 2m. After four years in the house the chamber was full to overflowing so we had it pumped out. After three days the water depth has risen by about one meter. It has not rained.
Any ideas what is the cause of the water inflow and what to do?

 

[45yearsagasman]

High water table? or other inflow that you are unaware of.

 

[dormermike]

What part of Cardiff?

 

[Nige F]

A wet part

 

[TicklyT]

Given the age of the property, built before public water supplies were common, was the chamber the rainwater runs into originally intended for disposal of waste water, or as a well for domestic water?

 

[dormermike]

A wet part

Plenty of wet basements since the barrage went in

 

[gerand01]

Given the age of the property, built before public water supplies were common, was the chamber the rainwater runs into originally intended for disposal of waste water, or as a well for domestic water?

I do not know, the visible part I can see - about 2 metres - has concrete sides so I suppose it may have been a well - the house is an old farmhouse and this chamber - which is vertical and goes down at least 4 metres - may have been a well I suppose but is now a soakaway for rain water.
We live to the west of Cardiif on the edge of The Vale of Glamorgan which is quite rural.

 

[gerand01]

High water table? or other inflow that you are unaware of.

I don't know how to find out the water table level but it has rained non stop here since April so it must be high