In a proceeding pursuant to CPLR article 78 to review a determination of the Planning Board of the Town of Patterson dated April 29, 1982, which after a declaration of environmental nonsignificance, approved respondents Ronald H. Schmidt’s and Leontine C. Schmidt’s final subdivision plat, petitioners appeal from a judgment of the Supreme Court, Putnam County (Hickman, J.), entered July 8,1982, which dismissed the proceeding on the merits. Judgment reversed, on the law, without costs or disbursements, petition granted to the extent that the determination dated April 29, 1982 is annulled, and the matter is remitted to the Planning Board of the Town of Patterson for a new determination in accordance herewith. Respondents Ronald H. Schmidt and Leontine C. Schmidt own a parcel of approximately 54 acres of land bounded on the west by Farm to Market Road (a county highway) and on the north by Big Elm Tree Road in the Town of Patterson. On April 8, 1982, they filed an application for approval of a “final subdivision plat” with the town planning board. The plat proposed a residential subdivision comprised of four lots: lot number one (1.37 acres) and lot number two (1.52 acres) would front on Farm to Market Road, lot number three (5.1 acres) would front on Big Elm Tree Road, and lot number four (46 acres) would remain undeveloped for the present time. Petitioners’ parcel of developed property, located on the westerly side of Farm to Market Road, is across the county road from the proposed development of lots numbers one and two. In the past, petitioners’ property has been flooded during and after rainstorms. A 24-inch diameter culvert collects storm water runoff from a roadside ditch on the east side of Farm to Market Road and conveys it under said road to the west side, where it is discharged onto petitioners’ property. Due to the contour of the land, which slopes steeply downhill in an east to west direction, a portion of the storm water originates from runoff from the acres comprising the Schmidts’ lots numbers one and two. The flooding problems experienced by petitioners in the
