800 EEPORT — 1888. 



3 inches a mile, or 9 feet 8 inches. After Framilode, round the Horseshoe bend, it 

 is about 1 foot per mUe. 



Fi-om Llanidloes to Sharpness, 140 miles, at mean sea-level the fall is 545 feet. 

 The tide flows up regularly to Tewkesbury, and a L'8-feet tide at Sharpness puts the 

 Navigation Weir at Tewkesbury out of action. This occurs on an average four 

 times' a month. The tide runs up to Upton, and on very high tides is still felt at 

 Worcester. 



(i) The Severn to Tewkesbttet. 



Area, 640 square miles ; rainfall, 20"26. Except about 20 square mUes of the 

 Upper Leaddon, which is partly porous, all the rocks of the Lower Severn are 

 superpervious. 



(ii) The Avon. 



Falls into the Severn at Tewkesbury ; 26 feet above sea-level ; 85 miles long, falls 

 226 feet (252 to 26); drains 1,040 square miles; rainfall, 20-11 inches. Except 

 a patch of pervious rock in the N.E. corner, all of the basin is composed of super- 

 pervious rocks. 



(iii) Mid Severn, 



Tewkesbury to Shrewsbury, leaving out the Teme ; fall, 153 feet (from 179 to 

 26) ; drainage area, 1,050 square miles ; rainfall, 19-54 inches. 



(Iv) Teme. 



Falls into Severn about 2 miles below Worcester ; about 27 feet above sea- 

 level ; lengtli, 64 miles ; fall, over 500 feet ; drainage area, 633 square miles ; rain- 

 fall, 22-91 inches. The rocks are impervious, 250 square miles ; partly pervious, 

 300 square miles ; superpervious, 50 square miles. 



(v) Upper Severn; 



Shrewsbury to the source, leaving out the Vyrnwy ; fall, 1,821 feet (2,000 to 

 179) ; length, 75 miles ; drainage area, 631 square miles ; rainfall, 22-91 inches ; 

 impervious rock, 250 square miles ; partly porous, 381 square miles. 



(vi) VrRNwr. 



Falls into Severn at Melverley ; 217 feet above sea-level ; length, 29 miles ; 

 fall, 1,283 feet (1,500 to 217); drainage area, 339 square miles; rainfall, 29-67 

 inches ; impervious rocks, 330 square miles ; porous, 5 square miles. 



The proportion of rock impervious, partly pervious, superpervious, and pervious 

 throughout the 4,350 square miles of the watershed is as follows : — 



Square miles 



Impervious . . 840 ' 



Partly pervious 825 



Superpervious . 2,100 



Pervious 585 



The area of high rainfall is]almost coextensive with the area of impervious rock. 



2. Rainfall. 



Taking the mean annual rainfall by counties, the figures are for 1887 : — 



Inches 



Montgomeryshire 31-67 



Shropshire 23-90 



Worcester 19-85 



Gloucester 22-18 



Hereford 19-53 



Stafiord 21-19 



Warwick 18-42 



or for the watershed 22-38 inches. 



