## Design the longitudinal drainage system.

A highway section is as shown in Figure P17.15. The runoff is caught by the grated inlets 1, 2, and 7 at station 204 + 00 and at the gutter sump 8 at station 205 + 78.1. In addition, the runoff from the drainage area to the south of the highway is collected in two inlets, 3 and 5. Inlet 3 connects to inlet 2 and then to manhole 4 at 205 + 95 and inlet 5 directly connects to manhole 4. The runoff from the south side of the highway is then conveyed under the highway to manhole 6, where the north side inlets are also picked up. The accumulated runoff is discharged from manholes 6 to 9 and into a natural water course. The tributary areas and their breakdown between pervious and impervious portions, length of drains, and surface slopes are indicated on the figure. The overland flow time to the intercepts has been considered to be 5 min. The 10-year rainfall intensity (in./hr) is given by i = 149/(t +15.7), where t is in minutes. Design the longitudinal drainage system. C = 0.3 for pervious areas and 0.95 for impervious areas. Use concrete pipe (n = 0.013).

Figure p17.15 ### Explain why attenuation is not a big problem in PET.

Consider a 2-D object consisting of two triangle compartments, as shown in Figure P9.4. Suppose a solution containing a 511 KeV gamma ray emitting radionuclide with concentration f = 0.5….

### Give the mean and the variance of the reconstructed image, mean[ˆ f(x, y)] and var[ˆ f(x, y)].

Ignoring the inverse square law and attenuation, an approximate reconstruction for SPECT imaging is given by where c˜() =  {||W()} and W() is a rectangular windowing filter that cuts off at = 0…..

### Find the numerical responses in each to an event in crystal C(4, 6).

Suppose a PET detector comprises four square PMTs (arranged as a 2 by 2 matrix) and a single BGO crystal with slits made in such a way that it is….