The document discusses various components of irrigation canal cross-sections, including:
1) Side slopes, berms, freeboard, banks, and service roads which are designed to retain water within the canal.
2) Back berms/counter berms which ensure saturation lines remain covered.
3) Spoil banks and borrow pits which are used to dispose of excess excavated earth or provide earth for filling sections.
It also outlines the main types of water losses from canals as evaporation, seepage/percolation, and absorption and describes the advantages of lining canals to reduce losses and maintenance needs.