LID & Detention Pond Sizing Tool to Address Hydromodification and Water Quality in Clackamas County
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1 LID & Detention Pond Sizing Tool to Address Hydromodification and Water Quality in Clackamas County Leah Johanson, Water Environment Services February 12 th, 2015
2 Agenda» WES History/Stormwater Standards» Hydromodification» Sizing Tool Low Impact Development (LID) Facilities Detention Pond» Sizing Comparison» Communication & Outreach» Questions 2
3 WES Design Standards History» 2009 Watershed Action Plans Impacts of Hydromodification In District Watersheds Early Action Item to Update Design Standards» 2010 Revised Stormwater Design Standards Promote the use of Low Impact Development Techniques Address Hydromodification via Continuous Flow Standard» 2011 Developed LID/Detention Pond Sizing Tool» 2014 Communications/Outreach» 2015 Encourage Use of Tools (Not Mandatory) 3
4 Hydromodification What is it?» Changes in watershed runoff characteristics due to changes in land use conditions (i.e. urbanization)» Higher/Rapid peak discharge» More Runoff Volume 4
5 Hydromodification Impacts» Action Plans Found Impacts in District Watersheds: Increased erosion of stream banks Channel instability Water quality degradation Areas of Degraded Riparian Habitat 5
6 Hydromodification & Stormwater Management» Current standards control peak flows for large storms Facilities sized to hold the high peak flows; Releasing lower flows that are geomorphically significant» Updated Standards/Tools have 2 Goals: Promote LID Techniques/On-site Infiltration Address Duration of Elevated Peak Flows» LID practices reduce runoff volumes and peak flows but may not be sufficient to address the duration of elevated peak flows that contribute to hydromodification impacts 6
7 Purpose of Sizing Tool» Develop a simplified tool to easily size both LID and Detention Ponds» Facilities are sized between a range of geomorphically significant flows to minimize the impacts of hydromodification» Will meet new MS4 Hydromodification permit requirements
8 Geomorphically Significant Flows» Geomorphically significant flows range between: Lower Threshold bed material is mobilized Upper Threshold channel bank over-topping event» Use ODOT Thresholds Lower Flow Threshold: 0.42Q 2 (ODOT) Upper Flow Threshold: Q 10 (ODOT)» Other Metrics Available ODOT thresholds provided a good starting point Can adjust in the future as new information is available 8
9 LID Sizing Strategy Flow Duration Upper Threshold Q(10) Lower Threshold (0.42Q2) 9
10 Sizing Tool Based on HSPF Modeling» Initial Model Completed by Pacific Water Resources in 2005 Calibration for drainage areas within the WES service area Lack of sufficient, high-quality records within the study area, therefore calibration used observed streamflow data for gauge sites in the Tualatin Basin.» Re-calibrated the HSPF model in 2008 Used observed streamflow data from long-term gauges located in the Johnson Creek Basin. Calibrations at three gauges deemed to have hydrologically similar physical characteristics as basins covered by the WES study area 10
11 HSPF Modeling for LID Sizing» Ran many pre/post landscape conditions» Sizing Factors determined for each LID facility type and scenario 11
12 LID Sizing Tool Basic Steps» Enter pre-developed site conditions» Enter post-developed site conditions» Select LID treatment option of choice» Tool provides required facility size to meet requirements 12
13 Sizing Tool 1) General Project Information 13
14 Identify Discharge Management Areas 14
15 Sizing Tool 2) Input DMA Information» Drainage Management Area Info: Area of DMA (ft2) Drainage area hydrologic soil group B, C, D Pre-developed Surface (Grass, Forest or Impervious) Post-Developed Surface Grass, Forested, Roofs, Concrete, Pavers etc., 15
16 Select LID Facilities» LID Facility Types (7 options) Planter (Infil & Fil) Rain Garden (Infil & Fil) Vegetated Swale (Infil & Fil) Infiltrator 16
17 Sizing Tool 3) Input Information & Link to DMA» Developer Enters:» DMA Draining to LID/BMP» Treatment Type Treatment and Flow Control Treatment Only» Site Specific Infiltration» Can drain an LID facility to detention pond 17
18 Detention Pond Sizing Approach» The detention pond sizing tool performs the following functions Configure pond geometry Design outlet structure Route post-project runoff Compare pre-project and mitigated flow duration Size the facility automatically» Flow duration modeling completed within the tool/not based on sizing factors 18
19 Detention Pond» User inputs initial pond configuration including surface area, depth and side slopes or stage-storage-discharge curve. Tool will pass or fail the pond. DMA LID 19
20 Detention Pond Interface» Alternatively, the tool can calculate pond depth or surface area 20
21 Pond: Flow Duration Analysis» Flow duration comparison is performed for pre- and mitigated time series hydrograph» Complete time series is analyzed» Range of interest is between lower and upper threshold flows 21
22 Resizing the Pond» If flow duration criteria is not met then the pond is resized iteratively» The user can use the option to resize by either adjusting the area or depth» Pond sizing is completed when hydro-modification performance requirements are met 22
23 Sizing Tool Output 23
24 Cost Comparison Study Happy Valley Town Center» Happy Valley Town Center (HVTC) 15.6 Acre Commercial Development Traditional Design within last 10-years» Findings LID design does not reduce the retail area, or parking LID Design $40k more over Actual Cost $535k less than Detention Pipe Alternative/New Standards
25 Cost Comparison Greenbrier Subdivision»Greenbrier Subdivision acre site residential 59 single-family lots averaging 7,100 sq-ft (2004)» Findings Existing Design ($17,291/lot, 59 lots) Treatment and Flow Control Pond ($25,357, 53 lots) Green St. Swale & Pond ($17,771/lot, 61 lots)
26 Sizing Tool Stakeholder Outreach Barney & Worth Conducted Outreach Nov/Dec 2014» Developers» Engineers Icon Construction Bruce Goldson, P.E. Renaissance Homes OTAK D.R. Horton Mackenzie VLMK Engineers, Cardno 26
27 Outreach Activities Preliminary Feedback Use of LID is minimal Need to know more details about LID before concerned with Tools General perception that engineers/ developers/county staff/homebuyers do not want it and not comfortable The tools are not currently being used on a regular basis, and not likely to unless it is a requirement Above all, participants want simplicity, flexibility, transparency, and cost efficiency
28 Next Steps» Internal Interviews (WES and Other County Agencies)» ID Sizing Tool Modifications» Possible Regional Coordination Oregon City & Wilsonville Using Sizing Tool Identify Other Agencies Interested» Continue Outreach» Modify Tool 28
29 Questions?» Water Environment Services Sizing Tool Contra Costa County IMP Sizing Tool Contact Info: Leah Johanson Krista Reininga Cedomir Jesic Libby Barg 29
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