4.4 SR 04-19-2021 - Laserfiche WebLink

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City of Elk River Design Standards Section 2500 - Storm Drainage Design Standards Storm design criteria and standards shall follow the requirements detailed in the Elk River Stormwater Program guide. Minor drainage facilities shall carry the 10-year recurrence runoff flows. Minor facilities include street gutter capacity, cross -culverts, storm sewers, and swales to the limits of easement and/or right-of-way. Materials Pipe for all storm sewer installations shall be reinforced concrete pipe. Reinforced circular pipe shall conform to ASTM C 76 for Wall B pipe. Reinforced Arch pipe shall conform to ASTM C 506. Plastic or HDPE pipe for storm sewer installations in green spaces (side or rear yard) may be considered on an individual basis. 2. Standard curb inlet castings shall be Neenah R-3067-V or approved equal. In developments with surmountable curb, the curb at catch basin inlets shall typically transition to a B-type curb as shown on Standard Plate 2005. When inlet castings do not align with a property line and surmountable concrete curb and gutter is being placed, inlet castings may be Neenah R-3501-TB provided written approval is obtained from the City prior to construction. 3. For new developments, stormwater outfall erosion prevention material shall be concrete articulated block (eg. Flexamat) or approved equal. 4. Driveway culverts located in city right-of-way shall be concrete or corrugated metal pipe. The culverts must be designed and sized to handle the expected drainage. Minimum allowable size for a driveway culvert shall be 12-inches. 5. Rip -rap shall be Class IV random rip -rap in accordance with Mn/DOT 2511 except that all rip - rap shall be made up of granite. Placement of rip -rap shall be as shown on Standard Plate 2505. 6. Rear yard inlets shall utilize a Neenah R-1733 casting with a type C grate. Ditch inlet castings shall be R-4341-A or R-4342. END OF SECTION 2500 © City of Elk River, Minnesota — All rights reserved 6