Westerly Creek, A Poster Child for Understanding the Benefit of Stormwater Investment

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1 Westerly Creek, A Poster Child for Understanding the Benefit of Stormwater Investment Presented at the ASFPM Annual Conference Atlanta, GA June 1 June Jon Villines, EIT, CFM Aurora Water Alan Turner, PE, CFM CH2M

2 What is this project about? Westerly Creek Two UDFCD Major Basins: Upper (9.0 sq. mi., upstream of Westerly Creek Dam) Lower (7.0 sq. mi. Westerly Creek Dam to Sand Creek) City of Aurora and Denver CH2M Updating MDP and FHAD for Upper Westerly Creek (2014) Lower Westerly last studied in 2010 Major detention areas: Jewell Wetlands, Utah Park, Expo Park, Westerly Creek Dam, Kelly Road Dam (all 100-year)

3 What is this project about? Westerly Creek City of Longmont City of Boulder Denver International Airport Downtown Denver Cherry Creek Reservoir City of Aurora

4 What is this project about? Westerly Creek Kelly Road Dam Westerly Creek Dam Expo Park Jewell Wetlands Utah Park

5 Why Westerly Creek? September, 2013 Storms Aurora and Westerly Creek Watershed were one of the hardest-hit areas inches of rain over 7-days Peak of 5.96 inches of rain on September 12, 2014 Historic levels of rain and runoff, but minimal damage $2.5 million in known damages to COA assets But it could have been much worse $48.8M investment (2014 $) in detention facilities over 56 years

6 Why Westerly Creek Peoria St, Downstream of Utah Park

7 Why Westerly Creek Peoria St, Downstream of Utah Park

8 Why Westerly Creek Peoria St, Downstream of Utah Park

9 Why Westerly Creek Utah Park

10 Why Westerly Creek Expo Park

11 Why Westerly Creek Kelly Road Dam

12 Why Westerly Creek Kelly Road Dam

13 Why Westerly Creek Westerly at 16 th St.

14 What s the Objective? Describe Benefit of Detention During/after storm, citizens said Parks and streets are flooding! Detention & conveyance functioned as-designed COA fared surprisingly well Multi-use detention facilities not well understood Gov. Hickenlooper expressed interest in quantifying benefit CH2M contracted to study benefit/cost of Westerly Creek detention facilities Kelly Road Dam Westerly Creek Dam APPROXIMATE SEPTEMBER 2013 FLOOD EXTENTS Expo Park Utah Park Jewell Wetlands

15 But How Do You Go Back in Time?

16 1 st : What Facilities Did we want to look at? Kelly Road Dam Westerly Creek Dam

17 1 st : What Facilities Did we want to look at? Expo Park Utah Park Jewell Wetlands

18 Flow (cfs) Flow (cfs) 2 nd : Update Hydrology to Remove Detention With Detention Hydrograph at Westerly Creek Dam Without Detention Hydrograph at Westerly Creek Dam Time (Minutes Time (Minutes) Flow With Detention Flow Without Detention

19 3 rd : Develop 2-D models for Upper and Lower Basin Manning s N Terrain

20 3 rd : Develop 2-D models for Upper and Lower Basin Terrain

21 Lastly: Determine Impacted Structures Used Data from a variety of Sources City of Aurora Building Shapefile City of Aurora Parcel Data City of Denver Building Shapefile Three Categories of Structures Identified Commercial Structures Multi-Family Residential Single Family Residential Structure Value Determined from Zillow

22 Cost Benefit Analysis Of Westerly Creek Detention Structures

23 Cost Development Construction Costs of Dams Dams were constructed and improved over a 56 Year period Records of Construction cost not always available Accurate costs found for: Jewell Wetlands Expo Park Utah Park Westerly Creek Dam An estimate for Kelly Road dam was done based on other ponds in basin Cost Escalated to 2014 Costs Cost of Construction (2014 $) versus Detention Volume for Westerly Creek Detention Facilities $35,000,000 $30,000,000 $25,000,000 $20,000,000 $15,000,000 $10,000,000 $5,000,000 $- y = x + 2E+06 R² =

24 Cost Development Construction Costs of Dams Dams were constructed and improved over a 56 Year period Records of Construction cost not always available Accurate costs found for: Jewell Wetlands Expo Park Utah Park Westerly Creek Dam An estimate for Kelly Road dam was done based on other ponds in basin Cost Escalated to 2014 Costs

25 Cost Development Construction Costs of Dams Detention Facility Year Constructed Constructed Cost ($) Volume (Ac-Ft) 2014 Cost ($) Jewell Wetlands 2001 $1,110, $1,484,000 Utah Park 2009 $5,400, $5,960,300 Expo Park 1999 $2,341, $3,325,400 Westerly Creek Dam 1987 $15,124,000 4,150 $31,508,300 Kelly Road Dam* 1953 $329, $2,910,000 Kelly Road Dam Exp.* 1979 $1,108, $3,609,000 *Cost estimated from other ponds.

26 Cost Development Structure Value Assumptions Structure Values were based on Neighborhood Averages from Zillow Assumptions for Categories Single Family 1 or 2 Story Structure w/basement Multi-Family 6 units per a structure Structure is multi-story with no basement Value based on neighborhood sales Commercial Structure is multi-story with no basement Average Commercial Value is $1.75 million dollars Neighborhood Avg. Value Structure East Colfax $199,900 1-Story With Basement Lowry Field $534,000 2-Story w/ basement Expo Park $200,000 2-Story w/ basement Utah Park $230,000 2-Story w/ basement Windsor $475,000 2-Story w/ basement Village East $350,000 2-Story w/ basement East Ridge $300,000 2-Story w/ basement

27 Cost Development Damage Assumptions Damage based on U.S. Army Corps of Engineers Depth Damage Tables Both Structure Damage and Contents Damage Considered Assumption of 1 depth of water for each impacted structure

28 Results Flood Plains for Upper Westerly Creek Without Detention With Detention (Existing) Kelly Road Dam Kelly Road Dam Westerly Creek Dam Expo Park Westerly Creek Dam Expo Park Utah Park Utah Park Jewell Wetlands Jewell Wetlands

29 Results Structures Impacted with Existing Detention Kelly Road Dam Structures Affected 69 Commercial Buildings 99 Multi-Family Buildings 389 Single Family Buildings Westerly Creek Dam Expo Park Cost of Damage Structure damage = $56,590,000 Contents Damage = $33,510,000 Total Damage = $90,100,000 Utah Park Jewell Wetlands

30 Results Structures Impacted without Existing Detention Structures Affected 204 Commercial Buildings 282 Multi-Family Buildings 1,657 Single Family Buildings Kelly Road Dam Cost of Damage Structure damage = $195,075,000 Contents Damage = $115,415,000 Total Damage = $310,490,000 Westerly Creek Dam Expo Park Utah Park Jewell Wetlands

31 Cost Benefit Analysis Costs Detention Facility 2014 Cost (Million $) Jewell Wetlands $1.48 Utah Park $5.96 Expo Park $3.33 Westerly Creek Dam $31.51 Kelly Road Dam $2.91 Kelly Road Dam Exp. $3.61 Total Cost = $48.80 Benefits Damage Type Without Detention Damage (Million $) Structure Damage $ Contents Damage $ Total Damage $ With Detention Structure Damage $56.59 Contents Damage $33.51 Total Damage $90.10 Net Benefit = $220.40

32 Cost Benefit Analysis Benefit Cost Ratio = Kelly Road Dam 4.5 Expo Westerly Creek Dam Park Utah Park Jewell Wetlands

33 Summary Value goes beyond Health and Safety The Benefits of Master Planning and implementation of drainage improvements are huge. Benefits go beyond Structure Damage Improved water quality Environmental Enhancement Recreational Enhancement Increased Park Space Enhanced Property Values Reduction in Flood Insurance Costs Additional Developable Land Increased Tax base for City Jewell Wetlands Kelly Road Dam at Lowry

34 Conclusions Take Away from September 2013 Total Damages seen in 2013 = $2.5 Million Dollars Most Damage was Sediment and Debris removal Peoria Street Reconstruction Handful of Structures Damaged Without Improvements Approximately $8.6 Million Dollars in Damage Approximately 60 Structures Damaged

35 Thank You!

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