10-02-1986 Planning Packet - Laserfiche WebLink

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Tb: Date: Mary Butler, Mayor Mark E. Bernhardson, City Administrator Orono Council Members Orono Planning Commission Members Michael P. Gaffron, Asst Planning & Zoning Administrator October 17, 1986 Subject: #1082 John F. Dougan, 2785 White Oak Circle - Conditional Use Permit ~ Public Hearing Zoning District - RR-lB Application - Conditional use permit for grading/excavating to create a storage pond for flood control purposes. List of Exhibits Exhibit A - Exhibit B - Exhibit C - Exhibit D - Exhibit E - Exhibit P - Exhibit G - Exhibit H - Application Plat Map Property Owners List Survey/Grading Plan Staff Letter 5/29/84 MCWD Letter 8/26/86 Topography of Sub-watershed Above Pond Air Photo Section Description of need project - The applicants are proposing to create a storage pond to collect runoff from the occasional "gully washer" that inundates their backyard for 12 to 48 hour periods. The upstream watershed has been calculated by staff at about 17 acres, the runoff from which is apparently very rapid due to steeper slopes upstream. After flowing through the culvert under Old Crystal Bay Road the watershed flattens out in Dougan's backyard, which is not a designated wetland and which, prior to construction of the White Oak Circle development, was cropland. There apparently exist some old agricultural tiles which drain Dougan's backyard further to the east, and staff has surmised that these tiles, although not located, may be near the surface. In a heavy rainfall, Dougan's backyard fills up to as much as 12-18" deep with water, then in a period of 12 to 48 hours it disappears without a clear overland channelization. We do know that when the water gets high enough it flows eastward through neighbor Marier's backyard and then southeast toward the cul-de-sac, but there must be some underground tiling that removes the ponded areas quickly. Dougan's drainfield is in a relatively low area west of the house, and is adversely affected by the runoff ponding near it. The proposal is to create a pond for storage near the culvert, then use the spoils to fill near the drainfield and create a swale to channelize the water past the drainfield.