City of Ashland sanitary sewer collection system master plan update

172 pp. Includes maps and figures. Published January 14, 2005. Captured March 21, 2008.The purpose of this Sanitary Sewer Collection System Master Plan Update is to: evaluate the capacity of the existing collection system during peak wet weather flows; evaluate the capacity of the collection system and determine improvement needs under future build-out conditions; develop a capital improvement program that will provide the City with a reliable and economic sanitary sewer collection system for the future; provide assistance in developing future program needs. The City has experienced stable growth over the past 20 years and expects this trend to continue for the next 20 years. This Sanitary Sewer Collection Master Plan Update focuses on evaluating the capacity of the existing system and assessing the impact the next 20 years of growth will have on the system. [From the Plan

The fundamental plane of elliptical galaxies with modified Newtonian dynamics

The modified Newtonian dynamics (MOND), suggested by Milgrom as an alternative to dark matter, implies that isothermal spheres with a fixed anisotropy parameter should exhibit a near perfect relation between the mass and the fourth power of the velocity dispersion. This is consistent with the observed Faber-Jackson relation for elliptical galaxies-- a luminosity-velocity dispersion relation with large scatter. However, the observable global properties of elliptical galaxies comprise a three parameter family; they lie on a ``fundamental plane'' in a logarithmic space consisting of central velocity dispersion, effective radius, and luminosity. The scatter perpendicular to this plane is significantly less than that about the Faber-Jackson relation. I show here that, in order to match the observed global properties of elliptical galaxies with MOND, models must deviate from being strictly isothermal and isotropic; such objects can be approximated by high-order polytropic spheres with a radial orbit anisotropy in the outer regions. MOND imposes boundary conditions on the inner Newtonian regions which restrict these models to a dynamical fundamental plane which may differ from that implied by the traditional virial theorem. Scatter about this plane is relatively insensitive to the necessary deviations from homology.Comment: 9 pages, 6 eps figures, mn style. Shortened and revised version includes more recent data on elliptical galaxies. Accepted for publication in MNRA