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2011-009 Council Ordinances
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2011-009 Council Ordinances
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City Council
Council Document Type
Ordinances
Meeting Date
03/28/2011
Council Meeting Type
Regular
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(d) The proposed activity may not reduce hydraulic efficiency of the drainage - <br />ways at any point upgradient of the applicant's parcel boundary. <br />(e) The property owner must record a declaration, or a public owner execute a <br />maintenance agreement, that prohibits plowed snow storage in a location from which <br />runoff will be conveyed without adequate pretreatment (minimum of 25 feet of overland <br />drainage on grassland or other rough vegetated surface to trap flow) or sheet flow directly <br />into a wetland. This requirement does not apply to snow removed from public roadways. <br />(0 Soil amendment, excavation or filling pursuant to development may not <br />impede groundwater flow so as to create a substantial risk of loss of function to any <br />wetland. <br />(g) The runoff volume infiltration/detention standard of paragraph (b) is <br />modified for public linear (roadway, sidewalk and trail) projects not part of an industrial, <br />commercial, institutional or residential development. Public linear projects shall meet the <br />requirements of the Rice Creek Watershed District (RCWD) or Vadnais Lakes Area <br />Water Management Organization (VLAWMO) as applicable. <br />(7) Peak Stormwater Runoff Control. Stormwater runoff rates for the proposed <br />project at the site boundary, in aggregate, must not exceed existing runoff rates for the <br />critical two-year and 100 -year frequency events. Any increase in a critical event rate at a <br />specific point of discharge from the site must be limited and cause no adverse down <br />gradient impact. The following curve numbers shall be utilized for existing condition <br />modeling of those site areas not covered by impervious surface in the existing condition: <br />Curve Numbers for Use with Existing Condition Pervious Areas <br />impervious area (ac) <br />Soil Amendments/Tilling <br />0.3" x surface area amended (ac) <br />(d) The proposed activity may not reduce hydraulic efficiency of the drainage - <br />ways at any point upgradient of the applicant's parcel boundary. <br />(e) The property owner must record a declaration, or a public owner execute a <br />maintenance agreement, that prohibits plowed snow storage in a location from which <br />runoff will be conveyed without adequate pretreatment (minimum of 25 feet of overland <br />drainage on grassland or other rough vegetated surface to trap flow) or sheet flow directly <br />into a wetland. This requirement does not apply to snow removed from public roadways. <br />(0 Soil amendment, excavation or filling pursuant to development may not <br />impede groundwater flow so as to create a substantial risk of loss of function to any <br />wetland. <br />(g) The runoff volume infiltration/detention standard of paragraph (b) is <br />modified for public linear (roadway, sidewalk and trail) projects not part of an industrial, <br />commercial, institutional or residential development. Public linear projects shall meet the <br />requirements of the Rice Creek Watershed District (RCWD) or Vadnais Lakes Area <br />Water Management Organization (VLAWMO) as applicable. <br />(7) Peak Stormwater Runoff Control. Stormwater runoff rates for the proposed <br />project at the site boundary, in aggregate, must not exceed existing runoff rates for the <br />critical two-year and 100 -year frequency events. Any increase in a critical event rate at a <br />specific point of discharge from the site must be limited and cause no adverse down <br />gradient impact. The following curve numbers shall be utilized for existing condition <br />modeling of those site areas not covered by impervious surface in the existing condition: <br />Curve Numbers for Use with Existing Condition Pervious Areas <br />Hydrologic Soil Group <br />Runoff Curve Number* <br />A <br />39 <br />B <br />61 <br />C <br />74 <br />D <br />80 <br />* Curve numbers from USDA-NRCS, Technical Release 55 <br />(8) Design Criteria <br />(a) Infiltration BMPs must be designed to provide: <br />1. Adequate pretreatment/sediment fore bays shall be provided before <br />discharge of runoff to the primary infiltration area(s) or pond inlet(s) to capture sediment <br />for ease of maintenance activity; <br />
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