Choosing rain-gauge density

摘要

A rain-gauge network is needed for a Tennessee community. Local officials have determined that a rain-gauge density of 23 km~2 (9 mi~2) per rain gauge is acceptable for their needs. Select preliminary locations to satisfy these requirements. A map showing the community's sanitary sewer service area is shown in the figure below. A 0.4-km (0.25-mi) grid is depicted over the service area. Preliminary locations are then selected using a 5-km (3-mi) grid to satisfy the 23 km~2 (9 mi~2) per rain gauge density requirement. Note that some locations are offset from the grid to accommodate limitations imposed by the service area boundaries.