Field campaign FC5 was conducted 9 days after manure application on a sunny day, in a phase of declining outflow following FC4, and more than 4 days after the last rainfall.
On the plateau, water holes near residential zones fall dry within a few weeks or months after the last rainfall event or, as in Andremba, provide just enough water for humans or small and privileged herds.
Along with intense heat, the coastal capital is also facing its driest January in 62 years, with its last rainfall occurring six weeks ago, according to the weather bureau.
It is expected to drench the region, with rainfall lasting for days.
In rural Gambia, many aspects of health and behaviour are defined by the distinct seasonal pattern, with a long dry season from November to June followed by a period of intense rainfall lasting from July to October.
Numerical slope stability modelling and historical accounts suggest, however, that heavy, long-lasting rainfall was the triggering factor for the 1756 Tjellefonna rockslide rather than an earthquake.
He added that there has not been a prolonged period of rainfall deficit lasting multiple years since the mid-1960's.
The loading was triggered by a sequence of short-spaced rainfall events lasting for a total of 167 days, which caused recharge to the unconfined aquifer thickening the water column by some 3.1 m.
To address this issue, a total of 12 rainfall simulation experiments were conducted in a 1 m by 5 m box with varying steep slopes (10°, 15°, 20° and 25°), and the simulated rainfall lasted for 1 h at a rate of 90 mm h−1.
Small handfuls of brown water from the last heavy rainfall still sit in the tarp's creases.
The southwest monsoon with an onset in June and lasting up to August brings scanty rainfall.
