Cover Image
close this bookHandbook for Agrohydrology (NRI)
View the document(introduction...)
View the documentAcknowledgments
View the documentSummary
close this folderChapter 1: Introduction
View the document1.1 The role of hydrology in agriculture
View the document1.2 Summary
View the document1.3 Project planning and practical problems
close this folderChapter 2: Measurement of runoff
View the document(introduction...)
View the document2.1 Estimates of runoff
View the document2.2 Collecting runoff data
View the document2.3 Water level recording instruments
View the documentEquipment costs
View the documentAppendix A: Measurement of runoff
close this folderChapter 3: Erosion and sedimentation data
View the document(introduction...)
View the document3.1 Soil erosion
View the document3.2 Field measurement of sediments (eroded material)
View the document3.3 Laboratory analysis
View the documentEquipment costs
View the documentAppendix B: Erosion and sedimentation data
close this folderChapter 4: Rainfall and other meteorological data
View the document4.1 Rainfall
View the document4.2 Other meteorological data
View the documentEquipment costs
close this folderChapter 5: Soils and soil moisture data
View the document(introduction...)
View the document5.1. Soil classification and soil textures
View the document5.2. Soil moisture
View the document5.3 Infiltration
View the documentEquipment costs
View the documentAppendix C: Soils and soil moisture
close this folderChapter 6: Catchment characteristics
View the document(introduction...)
View the document6.1 Natural vegetation
View the document6.2 Interception
View the document6.3 Catchment size, slope and topography
View the document6.4 Field orientation
View the document6.5 Antecedent soil moisture conditions
View the document6.6 Other catchment influences
View the documentEquipment costs
close this folderChapter 7: Water harvesting and field structures
View the document7.1 Water harvesting
View the document7.2 The design of bunds, channels and other field structures
View the document7.3 Surveys, marking out in the field and construction
View the documentEquipment costs
View the documentAppendix D1: Bund dimensions for various areas, slopes and soil types
close this folderChapter 8: Data analysis
View the document(introduction...)
View the document8.1 Statistical methods and data analysis
View the document8.2 Non-statistical analysis of agrohydrological data
View the documentAppendix E: Data analysis

(introduction...)

Soil physical, chemical and moisture properties constitute a study in their own right and it is possible that any agrohydrological or water harvesting project may have available the services of a soil specialist, but this is not always the case. The effects of soil physical properties on hydrological behaviour are very important.

Four main aspects of soils and their influence on runoff and agriculture are considered. These are:

1. The physical and textural nature of soils which are influential in determining runoff.

2. The soil moisture status which can also influence runoff and control water availability for crops.

3. How to measure soil moisture.

4. The influence of these soil factors on the process of infiltration, the ability of soils to absorb water.

In many respects soil textures and soil moisture status are closely linked; the physical characteristics of soils may change with the addition or removal of water, while the physical characteristics of soils will determine their ability to absorb and retain rainfall. In terms of the study of soils for agrohydrological purposes and the quantification of soil characteristics, it is most convenient to study these aspects separately. Methods of determining infiltration, which is strongly influenced by texture and moisture status, are also discussed.