The document outlines the class schedule for an Advanced Soil and Water Engineering course. It is broken into 15 classes covering topics like the physical characteristics of soil, micrometeorology, soil water and evapotranspiration, and soil and water engineering applications. The current class is discussing reference evapotranspiration and how it is used with crop coefficients to calculate actual evapotranspiration for different crops, like an example given for early paddy rice cultivation in Tottori, Japan.

1. 1
Advanced Soil and Water
Engineering #11
Masahiro Tasumi
Dept. Forest & Env. Sci.
Class schedule
No. Date Contents
1 4/11 Course outline for Advanced Soil and Water Engineering
2 4/18 Physical characteristics of soil I
3 4/25 Physical characteristics of soil II (NO CLASS)
4 5/9 Physical characteristics of soil III
5 5/16 Physical characteristics of soil IV
6 5/23 Micrometeorology I
7 5/30 Micrometeorology II
8 6/6 Micrometeorology III
9 6/13 Micrometeorology IV
10 6/20 Soil water and Evapotranspiration I
11 6/27 Soil water and Evapotranspiration II
12 7/4 Soil water and Evapotranspiration III
13 7/11 Soil and water engineering in operation I
14 7/18 Soil and water engineering in operation II
15 7/25 Discussions
Today’s Topic
Reference ET
ET = Reference ET * Crop Coefficient
What is “Reference ET”?
Reference ET is ET from reference surface.
Reference surface is a hypothetical grass
reference crop with an assumed crop height of
0.12m, a fixed surface resistance of 70 s/m, and
an albedo of 0.23.

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Crop Coefficient
Example of Cultivation Schedule, Early Paddy Rice in Tottori, Japan