Question | Answer |
Potential Evapo- transpiration | Amount of evapotranspiration that would take place if there was enough water in the soil |
Actual Evapotranspiration | Amount of evapotranspiration that actually takes place due to the limitations of lack of rainfall and reduced soil water content. |
Water deficiency | Lack of moisture in the soil |
water surplus | Soil moisture content at its maximum |
Soil moisture recharge | When moisture levels in the soil are increasing |
Soil Moisture use | When moisture in the soil is being depleted |
Hydrograph | A graph to show the variations in a rivers discharge ( amount of water ) over a short period of time, usually during a rainstorm |
Flood | When the capacity of a river to transport water is exceeded in the river channel and water flows over the river banks |
River discharge | The volume of water flowing through a river channel |
Rising limb | The period of rising river discharge ( water levels rising) following a period of rainfall |
Peak rainfall | The hour of greatest rainfall during a storm |
Peak discharge | The point ( time ) of maximum river discharge caused by the storm |
Falling Limb | The period of time when the rivers discharge is falling ( Amount of water is decreasing) after it has reached its peak discharge |
Base Flow | The average level of flow ( discharge ) of the river caused y water flowing into the river from tributaries and groundwater. |
Lag time | The time between peak rainfall and peak discharge |
Storm flow | The discharge of the river above base slow cause by a storm event |
Flashy Hydrograph | A storm hydro-graph that has a steep rising limb and means the river flooded quickly |
Gentle Hydrograph | A storm hydro graph that has a shallow rising limb and means the river flooded slowly |
Bankfull discharge | The maximum discharge that a particular river channel is capable of carrying without flooding. |
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