Wa llin gfo rd , Oxfo rd shire OX IO 8B8 ISBN 0 94 8540 00 I T he In st it ute of H yd ro logy is a co m po nen t esta blish men t of t he Na tu ra l Enviro nmen t Resea rch C o uncil A ll righ ts re served . N o pa rt o f t his pu blicat ion may be repro d uced , st ored in a re t rieva l syst em , or t ra nsm it ted in a ny fo rm o r by a ny mea ns, electr o nic, mec ha nical, pho toco pyin g, rec ord ing, o r ot he rwise , wit hou t the pr ior pe rm ission o f th e co pyr ight owner , In

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... ute of Hyd ro logy , C ro wma rsh G if f ord , Wa llin gfo rd , Ox on OX IO 8BB, Englan d . Prin t ed i n G reat Bri tai n by G al Lard ( Prin ters) Ltd , G reat Y arm out h á ACKNO W LE DGEM ENTS My sincere thank s to C olin Wright of the Depa rt men t of the Environment , fo r the origina l idea a nd initia l su pp ort for this boo k , to Da vid Jones of the Institute of Hydro logy for pro viding the pr oblem s a nd data sets fo r Cha pter 5 as well as ma ny helpful suggestion s, to Mrs T . Carr for typing the manuscript, Mrs A . Ma yho for assisting with the co mp utin g and M iss P. Binn fo r suggesting ma n y im pr ovements to the origina l ma nuscr ipt . Birmingham, October , 1984 R. L. H . á CO NT ENT S Pref ace A ck no wledgem ents Chap ter 1 Simple Linear Regression / .