1. Slide Title Use this slide style primarily for text Title Subtitle goes here Ames Post Construction Ordinance Eric Cowles, PE City of Ames

2. Slide Title Use this slide style primarily for text Title Subtitle goes here Iowa DNR Storm Water Permit “An ordinance shall be adopted or amended as needed and enforced which will address the control of runoff from building activities after construction has been completed. The ordinance shall require water quality and quantity components be considered in the design of new construction and implemented when practical. The statement shall promote the use of storm water detention and retention, grass swales, bioretention swales, riparian buffers and proper operation and maintenance of these facilities.” MS4 Permit

3. Slide Title Use this slide style primarily for text Title Subtitle goes here Public Input Storm Water Advisory Committee Tom Sauer, USDA Soil Scientist Charlie Kuester, Planner, Ames Steve Mayberry, ISU MS4Leanne Harter, Planner, Story Co. Chuck Winkleblack, Developer Kurt Friedrich, Developer Scott Renaud, FOX Engineering Nathan Easter, Bolton & Menk Jim Colbert, ISU Biologist

4. Slide Title Use this slide style primarily for text Title Subtitle goes here Past Requirements “Storm water management design shall include grading, facilities, improvements, or some combination thereof, which results in no increase in the rate of runoff when compared to the undeveloped condition in the area to be developed.”

5. Slide Title Use this slide style primarily for text Title Subtitle goes here Past Requirements “The rainfall frequencies that shall be incorporated in the design of the stormwater management system shall include the 5 year, 10 year, 50 year, and 100 year design storm events.” Did not address storm water quality and stream channel protection

6. Slide Title Use this slide style primarily for text Title Subtitle goes here Post Construction Ordinance Goals: Utilize a combination of BMPs, aka treatment train Minimize increases in storm water runoff, Minimize non-point source pollution, and Minimize mass grading

7. Slide Title Use this slide style primarily for text Title Subtitle goes here Post Construction Ordinance Applies to: New development and redevelopment disturbing 1 acre or more of land and to any development disturbing 10,000 square feet

8. Slide Title Use this slide style primarily for text Title Subtitle goes here Post Construction Ordinance Exemptions: Any Ag Activity Additions/Modification to Single Family Lots Anything within 1,000 ft of Ames Well Fields DNR Requirements?

9. Slide Title Use this slide style primarily for text Title Subtitle goes here Procedures/Requirements A storm water management plan prepared by PE or LA with site plan or preliminary plat Graphic inventory of existing natural resources Including hydric soils (wetland soils) and landscape features to be protected Adopts Iowa SWM Manual as Design Guide Requires Unified Sizing Criteria WQv, CPv, Overbank/Flood Protection

10. Slide Title Use this slide style primarily for text Title Subtitle goes here Procedures/Requirements Topographic watershed map LiDAR or City aerial topo Design calculations for proposed BMPs Post Construction Design runoff to meet “meadow in good condition” No Credit for existing impervious

11. Slide Title Use this slide style primarily for text Title Subtitle goes here Procedures/Requirements Use Low Impact Development (LID) features: Preserve open space and natural areas, Re-establish prairies Minimize impervious cover Capture, store, reuse runoff.

12. Slide Title Use this slide style primarily for text Title Subtitle goes here Procedures/Requirements Soil Management Plan General soils information (NRCS website) Borings as Needed Identifies Ground Water Identify “Soil Health”/Needs for Amendments Soils Scientist? Guides placement of BMPs

13. Slide Title Use this slide style primarily for text Title Subtitle goes here Procedures/Requirements Stream Buffers > 3 rd Order – Requires Assesment 1 st and 2 nd Order – 100’ Each Side Intermittent Streams – 50’ Each Side Waterways with Drainage Area > 50 Acres 30’ Each Side Waterways with Drainage Area > 50 Acres 20’ Each Side Maintained with Natives

14. Slide Title Use this slide style primarily for text Title Subtitle goes here Procedures/Requirements Maintenance, Repair and Landscaping Plan Addresses routine and long-term maintenance of: BMP’s Vegetation Responsibilities Review Schedule of the Plan

15. Slide Title Use this slide style primarily for text Title Subtitle goes here Procedures/Requirements Proof of Recorded Maintenance Easements for Access to Storm Water BMPs Recorded with the SWM Final Plan Dedicate Drainage Easements to City

16. Slide Title Use this slide style primarily for text Title Subtitle goes here Procedures/Requirements All Water Quality Maintenance Responsibility of Property Owners Exception: City Responsible for Large (Flood) Water Quality Features (i.e. detention basins) Dredging, Outlet Structures

17. Slide Title Use this slide style primarily for text Title Subtitle goes here For Lots Impacted by Storm Water BMPs Builder to Provide Elevation Certificate Lowest Opening/Foundations 3’ Above 100 Year Certified by LS, PE, LA

18. Slide Title Use this slide style primarily for text Title Subtitle goes here Waivers Granted by Municipal Engineer Written Request Doesn’t Impair Ordinance Objectives Establish Alternative On-Site SWM Establish Alternative Off-Site SWM Equal or Better than On-Site

19. Slide Title Use this slide style primarily for text Title Subtitle goes here Waivers Also Establish No Downstream… Deterioration of Structures Degradation of Bio Functions or Habitat Accelerated Erosion or Siltation Increase Threat of Flood Damage to Public Health, Life or Property

20. Slide Title Use this slide style primarily for text Title Subtitle goes here Performance Bond Financial Security with Final Plat or Site Plan In the amount of the total estimated cost for the construction of the BMPs Receive as-built plans from owner, City conduct final inspection of site, and then release financial security

21. Slide Title Use this slide style primarily for text Title Subtitle goes here Maintenance Inspections 1/Year by Owner or Rep Keep Inspection Records for at Least 3 Years Make Inspection Records Available to City Upon Request

22. Slide Title Use this slide style primarily for text Title Subtitle goes here Outreach Technical Assistance Documents Guide Through Ordinance Check List

23. Slide Title Use this slide style primarily for text Title Subtitle goes here Today Timing of Submittals Redevelopment Existing Regional Detention New Construction

24. Slide Title Use this slide style primarily for text Title Subtitle goes here Challenges New Apartment Complex Next to creek In flood plain/flood way Meeting with Developer’s Engineer Waivers

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26. Slide Title Use this slide style primarily for text Title Subtitle goes here Challenges Redevelopment Site Next to City Well No Perforated/Open Joint Pipe Allowed Meeting with Development Engineer and Owner Waivers

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