218 



J. HOPKINSON — REPORT ON THE 



Offside Cottage, Cowroast, 1*42 in. ; Sept. 29, St. Albans Roarl, 

 Watford, 1-07 in. ; Oct. 1, Gorhambury, St. Albans, 2-00 ins. ; 

 Nov. 6, St. Albans Road, Watford, M5in. ; Dec. 29, Moor Park, 

 Rickmansworth, 0"36in. 



The day in each month on which a heavy fall of rain was most 

 general over the county was — Jan. 15, Feb. 15, March 8 (and 25), 

 April 9 (and 16), May 14 (and 19), June 30, July 22, August 15, 

 Sept. 29, Oct. 1, Nov. 5, Dec. 28 ; and in the year, Nov. 5. 



The average number of wet days in each month was as follows : — 

 Jan., 20; Feb, 11; March, 9; April, 20; May, 12; June, 6; 

 July, 9; August, 8; Sept., 16; Oct., 11; Nov., 11; Dec, 15. 



The deviation from the mean for the 20 years 1870-89 was — 

 Jan., + 5 ; Feb., — 3 ; March, — 4 ; April, + 7 ; May, — 1 ; 

 June, — 7 ; July, — 5 ; August, — 5 ; Sept., + 3 ; Oct., — 4 ; 

 Nov., — 5; Dec, — 1. 



Table III. — Supplementary to Tables I anb II. 



Distribution of Rainfall thronghout the Year. — The following 

 table (Table IV, p. 219) gives the mean fall in each month and for 

 the year in each of the five river-districts represented, and in the two 

 main hydro graphical divisions of the county, the catchment-basins 

 of the Great Ouse and of the Thames, and also the difference in the 

 year from the mean for the decade 1880-89. 



The mean fall in each of the minor river-basins or sub-districts 

 represented was as follows : — {Cam) Rliee, 20*75 ins. ; {Ivel) Upper 

 Ivel, 22-09 ins. ; Hiz, 22-64 ins. ; {Thame) Upper Thame, 28-45 ins.; 

 {Colne) Bulbourne, 25-98 ins.; Gade, 26-13 ins.; Ver, 26-51 ins.; 

 Upper Colne, 26 64 ins. ; Lower Colne, 24-69 ins. ; {Lea) Mimram, 

 24-86 ins. ; Beane, 24-15 ins. ; Rib, 23-56 ins. ; Ash, 24-88 ins.; 

 Stort, 24-83 ins. ; Upper Lea, 23-03 ins. ; Lower Lea, 23-37 ins. 



The total yearly fall ranged from 19-93 inches at Odsey to 

 28-45 inches at Pendley Manor, Tring; and the total monthly fall 

 from 0-37 inch at New Bamet in August to 4-73 inches at Rick- 

 mansworth in November. The greatest fall in any one day was 

 2-00 inches at Gorhambury, St. Albans, on the 1st of October. 



