06-15-2020 Planning Commission Packet

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1486 (b) Nature of stormwater facilities. 1487 (I) Location.The subdivision shall be required by the city to carry away by pipe or open ditch any 1488 spring or surface water that may exist either previously to or as a result of the sulaelivisionplat. 1489 Such drainage facilities shall be located in the road right-of-way where feasible,or in perpetual 1490 unobstructed easements of appropriate width, and shall be constructed in accordance with the 1491 city's construction standards and specifications. 1492 (2) Accessibility to public storm sewers. 1493 a. Where a public storm sewer is accessible,the subdivider shall install storm sewer facilities; 1494 or,if no outlets are within a reasonable distance,adequate provision shall be made for the 495 disposal of stormwaters,subject to the specifications of the city.However,in subdivisions 496 containing lots les than 22,000 square feet in area and in business and industrial districts, 497 .. 498 . . ... . 1499 b. If a connection to a public storm sewer will be provided eventually,as determined by the 1500 city, the subdivider shall make arrangements for future stormwater disposal by a public 1501 utility system at the time the subdivision receives final approval. Provision for such 1502 connection shall be incorporated by inclusion in the performance bendBond required for the 1503 final subdivision. 1504 (3) Accommodation of upstream drainage areas. A culvert or other drainage facility shall in each 1505 case be large enough to accommodate potential runoff from its entire upstream drainage area, 1506 whether inside or outside the subdivision. The city shall determine the necessary size of the 1507 facility, based on the provisions of the construction standards and specifications assuming 08 conditions of maximum potential watershed development permitted by chapter 78 and 09 ••• . .• ommunity Management Plan. 1510 (4) Effect on downstream drainage areas.The city shall also study the effect of each subdivisienplat 511 on existing downstream drainage facilities outside the area of the subiliiLisionplat.City drainage 1512 studies,together with such other studies as shall be appropriate,shall serve as a guide to needed 1513 improvements.Where it is anticipated that the additional runoff incident to the development of 514 the subdivisionplat will overload an existing downstream drainage facility,the city may withhold 515 approval of the ss+I div sianplat until provision has been made for the improvement of the potential 1516 condition at the subdivider's expense and in such sum as the city shall determine. No 1517 st*bdivisie+}plat shall be approved unless adequate drainage will be provided to an adequate 1518 drainage watercourse or facility. 1519 (5) Floodplain areas. The city may,when it deems it necessary for the health,safety or welfare of 1520 the population of the area and necessary to the conservation of water, drainage and sanitary 1521 facilities,prohibit the subdivision of any portion of the property which lies within the floodplain 1522 of any stream,lake or drainage course. These floodplain areas shall be preserved from any and 1523 all destruction or damage resulting from clearing,grading or dumping of earth,waste material or 1524 stumps by the appropriate conservation easement. 1525 (c) Dedication of drainage easements. 1526 (1) General requirements.Where a subclivisienplat is traversed by a wetlands,swamp,watercourse, 1527 drainageway,channel or stream,there shall be provided a stormwater easement,conservation and 1528 flowage easement, or drainage right-of-way conforming substantially to the lines of such 1529 watercourse, and of such width and construction or both as will be adequate for the purpose. 1530 Wherever possible, it is desirable that the drainage be maintained by an open channel with 1531 landscaped banks and adequate width for maximum potential volume of flow. June 15,2020 page 35