Adobe and Bamboo Research Institute

Here is an example of housing along Monohara river where poverty level is below satisfactory. People from this house earn from 30 to 150 Rs. (.45 cents to 2$ ) a day. Even bamboo and mud is out of reach for many of them. A bamboo costs about 150 Rs. per piece and mud costs about 700Rs. per tractor. My question is why dont government plant bamboo along the river, so it can control flooding, erosing and at the same time provide building material for the poor?