Final answer:
The information provided does not directly address the loss of the Ewaso Nyiro River for the Samburu people, but environmental changes, human activities, and political decisions are common reasons for river loss, which may be applicable.
Step-by-step explanation:
The question asks why the Ewaso Nyiro River was lost from the Samburu people. Unfortunately, the provided information does not directly explain the loss of the Ewaso Nyiro River specifically to the Samburu. Typically, river loss in communities can occur due to environmental changes, human activities such as dam construction, pollution, and overuse, or political decisions that can lead to restricted access. One may infer that similar reasons may have contributed to the loss of access or depletion of the Ewaso Nyiro River for the Samburu people.
Looking at provided passages about other African regions and rivers, we see patterns of habitat destruction, political decisions leading to displacement, and exploitation of natural resources affecting communities and their access to rivers. While these passages do not specifically talk about the Ewaso Nyiro River, they suggest a broader historical and geographical context where similar issues could have affected the Samburu's relationship with their river.