19,2/ /046Institute ofHydrology

Natural Environment Research Council

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•••••• BURNHAMBEECHES• GROUNDWATERMONITORING•

1989- 1993•••••••••••••••

Institute of HydrologyCrowmarsh GiffordWallingfordOxfordshireOX10 8BBUK

• Tel: 0491 838800Fax: 0491 832256Telex: 849365 Hydrol G••

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Contents

Page

INTRODUCTION I•

• 2. RAINFALL DATA I

•

3. WINTERHILL GRAVELAND CONNECTEDSOLIFLUCTEDGRAVEL I

•

• 4. SOLIFLUCTEDGRAVELON THEINTER-TERRACEBLUFF 2

•

• 5. BOYNHILL GRAVEL 2

•

6. ALLUVIUM 3•

• 7. READINGBEDSAND CONNECTEDSOLIFLUCTEDGRAVEL 3

•

•8. CONCLUSIONS 4

•

9. FIGURES

••••••••••••••••••••••••••••••••••

Burnham Beeches GroundwaterMonitoring1991-1993••

1. INTRODUCTION•

This document was drafted by IH, at the request of the Corporation in order to assess the

results of the monitoring programme up to 1993.

The groundwater monitoring programme established in 1989 and 1990 has been continued by

the Corporation. Water levels in wells have been monitored weekly and rainfall measured at

one locality daily with only occasional gaps during holidays (shown as 1 mm on the rainfall

hydrographs). Consequently a good dataset has been built up of conditions prior to the

proposed gravel extraction. It is understood that pumping at the existing pit ceased in 1991

and has not been resumed since.

The data has been entered onto GRIPS (the IH GRoundwater Information Processing System)

up to the end of 1993 and output in the form of well hydrographs accompany this document.

Rainfall data is similarly presented. As groundwater flow in the monitored area is complex

it is difficult to draw a conventional water table map. Two maps representing high and low

water levels in 1993 are presented however which show some of the aquifer units identified

in the 1991 IH report. The monitoring results from each aquifer unit are discussed below.

The data from BB25 is presented but not discussed since it has only been monitored since

16.02.93 and water levels in the chalk aquifer are considered of little relevance.

,41

2. RAINFALLDATA

•Overall 1992 and 1993 were wet years following the drier years of 1990 and 1991. This is

reflected in the hydrographs eg from wells at the back of the Boyn Hill terrace (BB24 BB26)

and at the base of the inter-terrace bluff (BB35, BB36 and B1340) which show little response

to rainfall until the winter of 1992193.

The winter of 1991/92 was unusually dry. Hydrographs from, for example, the Winter Hill

terrace (13B13, BB14, B817, BB31, and BB32) do not show a winter peak with a subdued

summer peak in 1992.

.The variability of rainfall and corresponding hydrographs, demonstrates the need for several

years data.

•3. WINTERHILLGRAVELANDCONNECTEDSOLIFLUCTEDGRAVEL

This aquifer unit together with the Soliflucted. Gravel unit at the pumping test site is

delineated in blue on the water table maps, with flow in a southwesterly direction.

Wells in the Winter Hill Gravel aquifer are BBI3, BB14, B817, B1331,BB32 and BB34.

Hydrographs all show a rapid response to the same rainfall events with apronounced seasonal

fluctuation as well. Water levels are generally more shallow than found in the Boyn Hill

Gravel and Reading Beds aquifers. B834 shows more pronounced response to rainfall events

and also responses not shown on the other Winter Hill Gravel hydrographs eg in September

•

••

1991 with a peak on 17.09.91.

Wells in the Soliflucted Gravel in presumed hydraulic connection with the Winter Hill Gravel

are those wells at the pumping test site screened in gravel ie 13134213,BB42-1, 13842-2, BB42-

3B and BB42-4 which although at a lower elevation, with the exception of BB42-2, show

similar hydrographs to the wells in the Winter Hill Gravel. The more peaky hydrograph of

BB42-2 has an affinity with Winter Hill Gravel hydrograph at high water levels but an affinity

with the lower elevation Reading Beds Sand hydrograph (B842A and I3B42-3A) at low water

levels indicating connection with different aquifers at different seasons. Water levels at BB42-

3B are consistently lower than the other wells screened in gravel at the test site indicating

leakage to the lower Reading Beds aquifer around the well.

4. SOLIFLUCTED GRAVEL ON THE INTER-TERRACE BLUFF

Delineated in red on the water table maps this aquifer is represented by wells BB8, BB 10 and

131322.

Hydrographs all show little seasonal range of water levels but variable levels from week to

week responding rapidly to rainfall events.

Wells BB8 and BBIO are located where the gravel is thin and during the summers of 1989

and 1990 BBIO was dry, whereas 13138was consistently dry until the exceptionally wet late

November early December of 1992.

•

5. BOYN HILL GRAVEL

Delineated in green on the water table maps this aquifer is represented by wells 884, BB 1I ,

BB24, BB26, B827, BB37 and 8839.•

Groundwater flow is confined to an area between the brickearth with an initial steep hydraulic

gradient to the south then a gentle gradient to the southwest towards the inferred sink holes.

Hydrographs 8837 and 8839 show a seasonal response to recharge, particularly following

the rainfall of November 1992. Weekly variability is less than wells in the Winter Hill and

Soliflucted Gravel aquifers above, giving characteristically smooth hydrographs during this

period.

8827 was dry when drilled but surprisingly became wet on 03.09.91 (a dry day following

10 previous days with no rainfall). This well remained wct thercafter, recording a very peaky

response to the high rainfall during winter 1992/93. Such a response is not surprising bearing

in mind the aquifer here was found to be only 0.4m thick overlain by about 4m of brickearth.•

The hydrograph of 884 does not have much affinity with surrounding wells. Levels fluctuate

on a week to week basis responding rapidly to rainfall events. The response to the winter

rainfall of 1992/93 is less peaky and of a similar magnitude to previous seasonal high water

levels. Levels at B84 are consistently higher than nearby wells indicating local recharge in

this area. Surprisingly the hydrograph of 13134has greatest affinity with the hydrograph of

131329both in shape and elevation suggesting similar conditions or even a connection.

•

•2

•

•

•••

Hydrographs of wells BB24 and BB26 show a subdued response to recharge during winter

1990191 and spring 1992 with minimal weekly variability but a good response to the wetter

winter of 1992193.

Monitoring of BB11 ceased on 26.11.91. The hydrograph of this well shows no affinity with

nearby wells on the Boyn Hill terrace with the possible exception of BI34. Water levels at

BB11 tend to respond well to individual rainfall events but do not show a pronounced

seasonal effect.

•

6. ALLUVIUM

•Delineated in yellow on the water table maps this aquifer is represented by BB29 and BB30.

•The hydrograph of BB30 shows a strong affinity with hydrographs of wells at the pumping

test site screened in Reading Beds Sand (BB42A and BB42-3A) indicating hydraulic

connection (also indicated by the drawdown of the pumping test reaching BB30). Both

seasonal and weekly fluctuation at BB30 are more subdued than at BB42A and BB43-3A.

In contrast the hydrograph of BB29, further downstream along Swilly Brook, shows both a

more pronounced seasonal fluctuation and a good response to rainfall events.

•

7. READING BEDS AND CONNECTED SOLIFLUCTED GRAVEL

The Reading Beds aquifer is delineated on the water table maps in orange and is represented

by 1 group of wells in the Reading Beds Sand and connected Soliflucted Gravel, 3 groups of

wells in the Reading Beds Sand and 1 well (BB4I) in the Reading Beds Silt. The Reading

Beds are interpreted as a multi-level aquifer system.

The group of wells in the Reading Beds Sand and connected Soliflucted Gravel lie towards

the foot of the inter-terrace bluff and comprise BB35, BB36, BB40 and BB43A. The saturated

sand at BB35 was logged as pan of the overlying Sol iflucted Gravel sequence (though it could

be classified as Reading Beds Sand). Only 0.7m of Reading Beds Sand was logged at BB36

with the overlying saturated sands and gravels classified as Soliflucted Gravel. Hydrographs

of both these wells show close agreement with each other and with hydrographs of 8B40 and

BB43A screened entirely in Reading Beds Sand.. These hydrographs are all fairly smooth

with a subdued response to both individual rainfall events and seasonal recharge except a

seasonal response to the 1992/93 winter recharge. The affinity of these hydrographs with

those of BB24 and BB26 of the Boyn Hill Gravel suggest a hydraulic connection of the Boyn

Hill Gravel with the Reading Beds Sand at least as far as BB40 and BB43.

The upper aquifer at BB43 (BB43B) shows a similar hydrograph to that of BB21 with minimal

seasonal fluctuation. Whereas levels fluctuate slightly from week to week at BB21 they remain

more constant at BB43B.•

The hydrograph of BB20 shows a similar pattern to BB35, BB36, BB40 and 8B43A but there

is a clear lagged response to seasonal recharge. BB20 is the only representative of this aquifer

level within the Reading Beds.

The hydrographs of BB42A and BB42-3A screened in the Reading Beds Sand at the pumping

•3

•

••

test site show a strong affinity with hydrographs of wells screened in the overlying Soli flucted

Gravel and nearby Alluvium aquifers (referred to above) suggesting hydraulic connection.

•The hydrograph of BB41 in the Reading Beds Silt aquifer shows a similar pattern to the

hydrographs of the nearby Winter Hill Gravel although BB4I is more peaky particularly

during the 1992/93 winter recharge period.•

• 8. CONCLUSIONS

•As a result of regular weekly monitoring of well water levels and daily measurements of

rainfall, a very good dataset has been established. This data is not only essential information

necessary to safeguard groundwater levels under Burnham Beeches, it is also of scientific

interest and value.

The temporal variability of rainfall and the corresponding variability in the nature of the

hydrograph response to recharge, demonstrates the need to have several years pre-extraction

data.

Each aquifer unit is characterised by a particular type of hydrograph. Hydraulic connection

of both wells and aquifers can be inferred on the basis of the degree of similarity of

hydrograph shape.

•It would be worth considering further modelling, using the monitoring data in order to

improve our understanding of groundwater flow in the area. This would aid assessment of the

suitability of the existing network to act as an early warning system and also improve

predictions of the effect of gravel extraction:

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