The trench water level rises to near the surface within hours in response to high intensity rainfall then decreases relatively rapidly by approximately 0.5 m over 4 days after rain ceases.
When hiatuses in rainfall were longer than 15 20 min, runoff that had resulted from prior rain ceased completely before the recommencement of rain.
Furthermore, after a rainfall event ceased, most of the flow consisted not of water from the deep aquifer, but of water from the subsurface soil flow.
A specific aspect of the water cycle has intrigued many researchers throughout history: what feeds rivers after runoff from rainfall has ceased?
Nitrate-N increased with increasing rainfall at the beginning of the rainy season, fluctuated during the peak rainy period, and then decreased when the rain ceased.
Some agronomic practices (such as adjusting planting date and early maturing crop varieties) are flattering in both parts of the study areas in response to change in the time of onset of rainy season, the incidence of terminal moisture stress, and early cease of rainfall.
" Rainfall is expected to cease, at least for now, by Thursday; but light rains may fall again Christmas day.
Most of the year vegetation survives on stored soil moisture, and the growing period ceases as soon as the rainfall falls below evapotranspiration.
