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Workreport 1997-41

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Name:

Difference Flow Measurements at the Hästholmen Site in Loviisa, Boreholes KR1-KR3

Writer:

Jari Pöllänen; Pekka Rouhiainen

Language:

English

Page count:

165

Summary:

Working report: DIFFERENCE FLOW MEASUREMENTS AT THE HÄSTHOLMEN SITE IN LOVIISA,
BOREHOLES KR1 - KR3






ABSTRACT



Posiva Oy is responsible for the final disposal of the nuclear fuel waste into the Finnish
bedrock. Site investigations has been in progress at Romuvaara in Kuhmo, Kivetty in Äänekoski,
Olkiluoto in Eurajoki and Hästholmen in Loviisa. Flow measurements in bedrock are an important
part of the investigations program.

The developed difference flow method is used to determine hydraulic conductivity and hydraulic
head in fractures or fractured zones. The flow sensor for flow along a borehole and a new type
of flow guide are used for this measurement.

Flowmeter measurements were performed at the Hästholmen investigation site in boreholes
KR1 - KR3 between June and August 1997. The boreholes were measured with 2 m section lengths.
Total amount of measurement sections was 1328. Flow into the borehole or out from the borehole
was monitored in these sections. The flow was measured with and without pumping water from the
borehole. A detailed flow log with 0.1 m depth intervals was performed in spring 1998 in same
boreholes KR1 - KR3.

Detailed flow log was peformed with ten centimeter point intervals between January and May
1998. The flow guide encloses an electrode for single point resistance measurement. It was
logged during the detailed flow logging with one centimeter point intervals. This report
presents the principles of the difference flow method as well as the results of the
measurements.


Keywords: Groundwater, flow, measurement, bedrock, borehole.
DIFFERENCE FLOW MEASUREMENTS AT THE HÄSTHOLMEN SITE IN LOVIISA,
BOREHOLES KR1 - KR3






ABSTRACT



Posiva Oy is responsible for the final disposal of the nuclear fuel waste into the Finnish
bedrock. Site investigations has been in progress at Romuvaara in Kuhmo, Kivetty in Äänekoski,
Olkiluoto in Eurajoki and Hästholmen in Loviisa. Flow measurements in bedrock are an important
part of the investigations program.

The developed difference flow method is used to determine hydraulic conductivity and hydraulic
head in fractures or fractured zones. The flow sensor for flow along a borehole and a new type
of flow guide are used for this measurement.

Flowmeter measurements were performed at the Hästholmen investigation site in boreholes
KR1 - KR3 between June and August 1997. The boreholes were measured with 2 m section lengths.
Total amount of measurement sections was 1328. Flow into the borehole or out from the borehole
was monitored in these sections. The flow was measured with and without pumping water from the
borehole. A detailed flow log with 0.1 m depth intervals was performed in spring 1998 in same
boreholes KR1 - KR3.

Detailed flow log was peformed with ten centimeter point intervals between January and May
1998. The flow guide encloses an electrode for single point resistance measurement. It was
logged during the detailed flow logging with one centimeter point intervals. This report
presents the principles of the difference flow method as well as the results of the
measurements.


Keywords: Groundwater, flow, measurement, bedrock, borehole.

Keywords:

Groundwater; flow; measurement; bedrock; borehole

File(s):

Difference Flow Measurements at the Hästholmen Site in Loviisa, Boreholes KR1-KR3 (pdf) (7.6 MB)


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