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4.2.6 Capaul's Pond Water Management Plan 4.2.6.1 Location and General Description Capaul's Pond (DNR #82-365W) is located in subwatershed DEM18, in Grant Township and the City of Pine Springs, on both sides of the DNR Gateway Trail and approximately 1,000 feet north of the trail's intersection with T.H. 36. The tributary area of Capaul's Pond is 155 acres, and is comprised of subwatersheds DEM18 and DEM19. The DNR's OHW for Capaul's Pond is 980.4. The pond is made up of seven basins which become separated when water elevations are low. The entire pond is 19 acres in size at Elevation 980; approximately four acres (three basins) are located east of the trail and approximately fifteen acres (four basins) are located west of the trail. A culvert through the trail equalizes the ponds on the east side of the trail with the northerly three ponds on the west side of the trail. A six-inch diameter pipe at Elevation 981.3 through a driveway separates the northerly three ponds from the pond south of the driveway. The low point in the driveway is at Elevation 982.6, based on a 1992 VBWD survey. 4.2.6.2 Drainage Patterns and Stormwater Issues The basement of a home on the pond is low enough that it has flooded at different times in the past. According to the homeowner, basement flooding occurs when pond water levels are about six inches above the low point in the driveway. The overflow from Capaul's Pond is located in the ditch on the west side of the DNR's Gateway Trail, north of T.H. 36. According to a long-time resident on Capaul's Pond, the railroad maintained the ditch from Capaul's Pond until the railroad abandoned the track. Since that time, overflow elevations from Capaul's Pond have varied over the years as follows: 983.1 round shot) -- 1977, determined during platting of Winmar Estates in Pine ■ 983.7 (ground shot) -- October 17, 1985, John Stine survey (DNR). ■ 982.9 (ground shot) -- April 1, 1992, Barr Engineering survey (VBWD). ■ 982.5 (culvert invert) — July 12, 1993, Metro Engineering survey (DNR). ■ 982.0 (ground shot 6 feet upstream of culvert) and 981.7 (culvert invert) -- September 3, 1993, Chuck Revak survey (DNR). As a result of the DNR's 1992 trail construction and subsequent emergency repairs in 1993, the runout elevation became the high spot in the ditch on the west side of the trail, near the south side of Capaul's Pond, at Elevation 982.0 (see September 3, 1993 survey results). In response to VBWD's request, the DNR installed a permanent structure which controls the Capaul's Pond outflow elevation at 982.5. The control structure is located in the outflow ditch, near the pond. Depending on downstream water level conditions, the outflow elevation of Capaul's Pond can be lowered to Elevation 981.7, the invert of the culvert located just downstream of Capaul's Pond, on the west side.of the trail. Overflows from Capaul's Pond occurred in 1986, 1993 and 1994. In 1993, overflow continued from mid -July to mid -September. The 100-year flood elevation for the pond is at Elevation 984.0, approximately 1.5 feet higher than the runout elevation. The overflow path from Capaul's Pond follows a ditch on the west side of the DNB's Gateway Trail, flows through a culvert which carries water from the west side to the east side of the trail and south of T.H. 36, finally reaching a wetland basin on the east side of the trail (Pond B on Figure 4-6), just south of T.H. 36. Prior to MNDOT's work in the area in 1987, overflow from Pond B was to Pond-C, then southwest along the east side of the trail, to a large pond (not DNR-protected) 23\82\045\SEC4.RPT\KMH 16 DRAFT: June 23, 1994