08-13-2020 Council Packet - Laserfiche WebLink

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July 20, 2020 page 24 connection shall be incorporated by inclusion in the performance Bond required for the final 994 subdivision. 995 (3) Accommodation of upstream drainage areas. A culvert or other drainage facility shall in each 996 case be large enough to accommodate potential runoff from its entire upstream drainage area, 997 whether inside or outside the subdivision. The city shall determine the necessary size of the 998 facility, based on the provisions of the construction standards and specifications assuming 999 conditions of maximum potential watershed development permitted by chapter 78 and 1000 Community Management Plan. 1001 (4) Effect on downstream drainage areas. The city shall also study the effect of each plat on existing 1002 downstream drainage facilities outside the area of the plat. City drainage studies, together with 1003 such other studies as shall be appropriate, shall serve as a guide to needed improvements. Where 1004 it is anticipated that the additional runoff incident to the development of the plat will overload an 1005 existing downstream drainage facility, the city may withhold approval of the plat until provision 1006 has been made for the improvement of the potential condition at the subdivider's expense and in 1007 such sum as the city shall determine. No plat shall be approved unless adequate drainage will be 1008 provided to an adequate drainage watercourse or facility. 1009 (5) Floodplain areas. The city may, when it deems it necessary for the health, safety or welfare of 1010 the population of the area and necessary to the conservation of water, drainage and sanitary 1011 facilities, prohibit the subdivision of any portion of the property which lies within the floodplain 1012 of any stream, lake or drainage course. These floodplain areas shall be preserved from any and 1013 all destruction or damage resulting from clearing, grading or dumping of earth, waste material or 1014 stumps by the appropriate conservation easement. 1015 (c) Dedication of drainage easements. 1016 (1) General requirements. Where a plat is traversed by a wetlands, swamp, watercourse, 1017 drainageway, channel or stream, there shall be provided a stormwater easement, conservation and 1018 flowage easement, or drainage right-of-way conforming substantially to the lines of such 1019 watercourse, and of such width and construction or both as will be adequate for the purpose. 1020 Wherever possible, it is desirable that the drainage be maintained by an open channel with 1021 landscaped banks and adequate width for maximum potential volume of flow. 1022 (2) Drainage easements. 1023 a. Where topography or other conditions are such as to make impractical the inclusion of 1024 drainage facilities within road rights-of-way, perpetual unobstructed easements of an 1025 appropriate width for such drainage facilities shall be provided across property outside the 1026 road lines and with satisfactory access to a public roadway. Easements shall be indicated on 1027 the plat. Drainage easements shall be carried from the road to a natural watercourse or to 1028 other drainage facilities. 1029 b. When a proposed drainage system will carry water across private land outside the plat, 1030 appropriate drainage rights must be secured and indicated. 1031 c. The subdivider shall dedicate, by drainage or conservation easement of land on both sides of 1032 existing watercourses, to a distance to be determined by the city. 1033 Sec. 82-223. - Water facilities. 1034 (a) Public water systems. 1035 (1) Where a public water main is accessible, the subdivider shall install adequate water facilities, 1036 including fire hydrants, subject to the specifications of the State or city. 1037 (2) Water main extensions shall be approved by the city. 1038