Well spacing requirements that limit well density are also a type of zoning regulation. Zoning is commonly decided by hydrologists, geologists, or environmental engineers working for a government regulatory agency, and is thus often sensitive to local hydrologic conditions. For example, well spacing restrictions are often set explicitly on the basis of local hydrologic properties to avoid significant well interference. Thus, above aquifers with higher transmissivities and lower storativities, there are correspondingly larger well-spacing requirements (e.g. see Brozovic et al.,