Initial basin recharge refers to the amount of water that enters the basin immediately after a rainfall event. It is an important parameter in hydrological studies as it helps in understanding the water balance of a basin and estimating the availability of water resources.

Interception:
- Interception refers to the process of rainfall being intercepted by the canopy of vegetation before it reaches the ground.
- When it rains, a portion of the rainfall is intercepted by the leaves, branches, and stems of plants.
- This intercepted water is later evaporated back into the atmosphere or drips down to the ground surface.
- The intercepted water that eventually reaches the ground contributes to the initial basin recharge.

Depression Storage:
- Depression storage refers to the water that accumulates in natural depressions or low-lying areas on the ground surface.
- These depressions can include potholes, small ponds, or areas of uneven terrain.
- When it rains, water collects in these depressions and contributes to the initial basin recharge.
- The depression storage is temporary and may either evaporate, infiltrate into the ground, or contribute to surface runoff.

Rain Absorbed by Moisture Deficiency:
- Moisture deficiency refers to the unsaturated condition of the soil where it has the capacity to absorb more water.
- When it rains, a portion of the rainfall is absorbed by the soil due to its moisture deficiency.
- This absorbed water replenishes the soil moisture and contributes to the initial basin recharge.
- The excess water that cannot be absorbed by the soil may become surface runoff or infiltrate deeper into the ground.

All the Above:
- The correct answer is option 'D' because all the mentioned factors contribute to the initial basin recharge.
- Interception, depression storage, and rain absorbed by moisture deficiency are all sources of water that replenish the basin after a rainfall event.
- Each factor plays a role in the overall water balance of the basin, and considering all of them is important for accurate estimation of the initial basin recharge.

In conclusion, the initial basin recharge is equal to interception, depression storage, and rain absorbed by the moisture deficiency. These factors collectively contribute to the water that enters the basin immediately after a rainfall event and play a significant role in the overall water balance of the basin.