172 WORGRET HILL AND WAREHAM WATER SUPPLY. 



upper beds of C. We have seen that when the overlying Clay 

 series was perforated, the water in the upper part of the Second 

 Sand-series was forced upwards to 91 feet from the surface, which 

 is about the level of the water-line of the valleys of the Frome 

 and Pydel, along the line A-B of the plan (Fig. i). Since the 

 dip is north-easterly it would seem probable that the supply in 

 the main comes from the direction of the water-logged beds of 

 the Frome valley, and to a very small extent perhaps from the 

 leakage of the river itself. The almost total absence of carbonate 

 of lime in the well-water is proof that the river itself contributes 

 but little to the supply. The principal outcrops of the Bagshot 

 Beds on the south-west slope of Worgret Hill seem to belong to 

 the Second Sand-series, and if this is the case throughout the 

 slope the north-easterly dip must diminish very considerably as 

 the main valley is approached. These beds are also protected 

 to a certain extent, as shown in Boreholes 3, 4, and 5, by a 

 considerable amount of superficial deposits, which attain an 

 unknown thickness along the 50 feet contour. Otherwise, they 

 are favourably situated for absorbing their share of the total 

 rainfall, and the water so collected must move in a north-easterly 

 direction so long as the beds continue to dip to any appreciable 

 extent. 



CONCLUDING REMARKS. 



Referring once more to the amount and direction of dip on 

 the south-west slope of Worgret Hill, one would expect to have 

 come across the outcrop of the Lower Clay or Pipeclay-series 

 (D) before reaching the flats of the Frome Valley. This, how- 

 e^'er, does not seem to be the case, unless the 7 ft. 6ins. of 

 " Clayey fine sand " in No. 5 Borehole, may be taken as a 

 partial indication of the Pipeclay-series. This particular bed is 

 well exposed in an adjacent roadway, and weathers very like a 

 pipeclay. But then it is by no means unusual to find a few feet 

 of such pale clays amongst the more sandy Bagshots, and in 

 differentiating these beds it is not always easy to say which is a 

 sand and which is a clay. Hence for all practical purposes we 



