Altitude of the top of the upper confining unit of the gray limestone aquifer, southern Florida, USGS WRIR 99-4213 figure 21

The map shows the altitude of the top of the confining unit which ranges from 10 ft above sea level to 50 ft below sea level in much of the study area, and slopes downward to the east and southeast. The contour interval is 25 feet.

The purpose of this report is to evaluate the hydrogeologic framework, hydraulic properties, and ground-water flow of the gray limestone aquifer in southern Florida. The report also emphasizes the geologic framework (stratigraphy and structure) and the hydrogeologic framework (aquifers and confining and semiconfining units) above and below the gray limestone aquifer.

本地图展示了隔水层（confining unit）顶面的海拔高程，在大部分研究区内，该高程介于海拔10英尺至海平面下50英尺之间，并向东及东南方向逐渐降低，其等高距为25英尺。

本报告旨在评估佛罗里达州南部灰色石灰岩含水层（gray limestone aquifer）的水文地质格架（hydrogeologic framework）、水力特性（hydraulic properties）与地下水流动状况。此外，本报告还重点阐述了灰色石灰岩含水层上覆与下伏的地质格架（地层与构造）以及水文地质格架（含水层、隔水层与半隔水层（semiconfining units））。