In this time of municipal jurisdictions thinking surface water is a liability, we are exceedingly pleased with how we've handled our roof water. The larger pond overflows into the wetland (Picture 1) where, despite some torrential downpours of late, has handled, with room to spare, all of our roof water. All three roofs feed the upper pond or creek directly, then flow down the creek to the lower pond. Once the lower pond is at capacity the water overflows into the wetland. The second photo illustrates the guesthouse roof water flowing into the creek. The other two buildings are piped underground directly to the upper pond.
Very heavy rain during the night and well into the morning resulted in the deepest wetland collection I'd observed. At 11:00 a.m. the wetland, at it's deepest, was 6.5" and covered an area 7' by 15'. By 12:00 there was little or no rain and the stream had stopped flowing. The wetland was already going down. By 3:00 the wetland was 2" deep at its deepest and measured 5' by 13'. At no time did we come even close to capacity. These results were in saturated ground as we've had a very rainy few weeks.
The water in the stream in this photo (below) is all rain water. The circulating pump mostly runs in the summer when there is little rain.
Birds have been thoroughly enjoying drinking and bathing at the ponds' edges, especially during their migration this fall. On occasion we'll see as many as 20 or 30 birds at a time accessing the pond.