Practical: Construction of rustic dams or dams: structural and natural measures
The qochas are built by taking advantage of natural depressions in the ground or natural lagoons, constructing a dam to increase the level of the dammed water and therefore capture and store more water from rainfall. Three types of qochas are identified :
1. Water harvesting qochas, used to store water superficially, thanks to their impermeable base and edges.
Water planting qochas, which store water for a short time thanks to their permeable base. The stored water infiltrates and recharges the subsoil and local aquifers.
3. The qochas for planting and harvesting water (mixed): they have both characteristics due to their semi-permeable characteristics.
Structural components: earth, clay and champas dams, the spillway with its overflow ditch, and the collector or adduction channel (where required).
Non-structural components/green measures: complement the qocha forming an integrated system. Conservation of natural grasses, afforestation and reforestation with native species, and infiltration ditches.