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I I I Road Ei the second source is the precipitation which actually falls on the site. Apparently the catch basins have not been able to accommodate all the runoff from north of County Road E as the flow has eroded the bituminous curbing around at least one of the catch basins. The upslope runoff flows through the curbing breach onto the Windsor Center site. The catch basin system was installed by and is maintained by Ramsey County. The proper repair and possible modification of the bituminous curb- ing will intercept the flow from north of County Road E and prevent its discharge onto the Windsor Center site. It should be noted that the 6.3 acre site also receives some runoff from a small area adjacent to the northwestern portion of the site as well as from the extreme northern portion of the Windsor Green development which borders the site on the south. The overall drainage area of the site (excluding the area north of County Road E which should not contribute to the site) is ap- proximately 6.45 acres in size. ~I I I I I I I I I I I Most of the runoff on the site is derived from pre- cipitation. As noted above, the hydrology of the site lS largely self contained. Rainfall or snow- melt on the site flows to the two virtually land- locked ponds and below elevation 939 is dispelled from the ponds by evaporation and percolation. Percolation rates in this clay soil are low so most of the water loss is due to evaporation. I I I The following data relates percentage of the site which is open water to percentage which is land at various water levels. I 111-10 I