TABLE OF CONTENTS 



Page 



lET'lER OF TRANSMITTAL vii 



ORGANIZATION, DEPARTMEJIT OF WATER RESOURCES viii 



ORGANIZATION, CALIFORNIA WATER COMMISSION ix 



ACKNOWLEDGMENT x 



CHAPTER I. INTRODUCTION 1 



Need for Vegetative Water Use Studies 1 



Authorization 2 



Objective • 3 



Scope of Present Program and Report • h 



CHAPTER II. AGROCLIMATIC MONITORING PROGRAM 7 



Instrumentation at Agroclimatic Stations • 8 



Atmometers 8 



Evaporation Pans 9 



Agroclimatic Data Analysis 9 



CHAPTER III. EVAPOTRANSPIRATION MEASUREMENT 21 



Measurement of Data Related to Evapotranspiration 22 



Criteria for Selection of Plots 2i| 



Evapotranspiration Measurement Technique and Discussion of 



Development and Current Methods 25 



Field Plot Sampling Neutron Scattering Technique 29 



Pittville Neutron Probe Moisture Depletion 



Measurements 31 



Arvin Neutron Probe Moisture Depletion Measurements . , 3li 



iii 



