| Term No. | Term Name | Term Description |
| 6800 | Eco‑development | A form of planned growth that optimises the use of locally available resources within the constraints of the local environment...... |
| 6656 | Ecocline | Gradual changes in the morphological or physiological features in organisms along an environmental gradient. ..... |
| 6734 | Ecological balance | A state of equilibrium in a natural community, as indicated by the relative numbers of the components of the community remaining more or less constant..... |
| 6577 | Ecological factor | Any part or condition of the environment that influences the life of one or more organisms. ..... |
| 6578 | Ecological impact | The total effect of an environmental change, either natural or man‑made, on the ecology of the area. ..... |
| 6747 | Ecological integrity | Maintenance of the structure and functional attributes characteristic of a particular locale, including normal variability. ..... |
| 6579 | Ecological province | A continuous area in which the ecological systems produced by climate, topography, biota and soil can be described as meaningfully different than othe..... |
| 8868 | Ecological status | An expression of the quality of the structure and functioning of aquatic ecosystems and how human activities influence them. ..... |
| 6748 | Ecological stress | The result or consequent state of a physical, chemical, or social stimulus on an organism or system...... |
| 6687 | Ecological succession | The sequence of distinctive plant and animal communities that occurs over time within a given area. ..... |
| 6571 | Ecology | The study of the relationships of living things to one another and to their environment. ..... |
| 6799 | Economic conservation | The management of natural resources or the environment, so as to sustain a regular yield of a commodity at the highest level feasible...... |
| 8933 | Economic cut | For practical purposes there exists within a one-bank canal section a point on the ground surface that, if the excavation is to balance the embankment..... |
| 9214 | Economic depreciation | The loss in value resulting from external economic conditions affecting the character or degree of utilization...... |
| 4128 | Economic effectiveness of a flood management system | The efficiency of a flood management scheme in generating economic benefits. ..... |
| 5026 | Economic efficiency of irrigation | At the level of a field and its individual system, the economic efficiency of irrigation is the ratio between the cost of additional production obtain..... |
| 9099 | Economic feasibility, or Economic justification | A test of the proposed project to determine whether the anticipated benefits will exceed the estimated costs...... |
| 9142 | Economic life of a project | The life of a project determined by the point in time at which the effect of economic and physical factors (physical depreciation, obsolescence, chang..... |
| 8623 | Economic life of a system | Life of a system from the day of its operation to the day when the incremental benefit from continuing operation of the system by one more time period..... |
| 7567 | Economic poisons | Chemicals used to control pests and to defoliate cash crops such as cotton...... |
| 9173 | Economic value of unit of irrigation water | The value of a crop raised by a unit of irrigation water, if run continuously throughout the life of the crop...... |
| 4895 | Economic water duty | Duty of water which results in (i) the maximum yield or maximum net profit per unit area when land is the limiting factor, (ii) the maximum yield or m..... |
| 1116 | Economic yield | The maximum rate at which water can be withdrawn from an aquifer throughout the foreseeable future without depleting the supply or altering the chemic..... |
| 6086 | Economical haul distance | An arbitrary distance when any piece of equipment and haul material operate most efficiently or profitably...... |
| 6576 | Ecoregions | Geographical regions that have broad similarities with respect to soil, relief and dominant vegetation. ..... |
