STANDARD ERROR OF ESTIMATE (PER CENT) 
Figure 2 
STATISTICAL AND PROBABILISTIC ANALYSIS OF HYDROMETEOROLOGICAL DATA 121 
Mean annual runoff 
A Regression between mean annual flow and physiographica1 character 
istics (Solomon, 1972) 
B Square-grid method - mean annual runoff (Solomon, 1972) 
C Grid square parametric model (Solomon, 1972) 
a Isoline valuer (Shawinigan, 1970) 
b Regression between mean annual flow and physiographical character 
istics (Leith, 1976) 
c Isoline values (Coulson, 1967) 
dt.d2.d3 Regression between mean annual flow and physiographica1 and 
climatic characteristics for eastern, southern and western regions 
of U.S.A. respectively (Thomas and Benson, 1970) 
D Square-grid method mean annual runoff in North-West Territory 
(Shawinigan, 1982) 
Figure 1.2 - Standard error of mean annual runoff versus 
gauging station density 
From S.I.Solomon and J. Cordery, Compendium of Meteorology, 
for Use by Class I and Class II Meteorological Personnel, 
Volume 11, Part 5, Hydrometeorology. WMO Publication No. 
364, Geneva, 1984. 
643