Co-Operative Stormwater Management Initiative
Total Page:16
File Type:pdf, Size:1020Kb
CO‐OPERATIVE STORMWATER MANAGEMENT INITIATIVE Engineering Assessment of Preferred Stormwater Management Options FINAL APRIL, 2014 Suite 260, East Atrium 2635 – 37 Ave NE Calgary, AB T1Y 5Z6 Phone: 403-250-1362 1-800-351-0929 Fax: 403-250-1518 Co‐operative Stormwater Management Initiative April 23, 2014 c/o Western Irrigation District File: N:\29\159 CSMI\Reports\Final Box 2372 Strathmore, Alberta T1P 1K3 Attention: CSMI Partners Dear Partners: Re: Co‐operative Stormwater Management Initiative Engineering Assessment of Preferred Stormwater Management Options MPE Engineering Ltd. (MPE) is pleased to submit the “Engineering Assessment of Preferred Stormwater Management Options Report” to the Co‐operative Stormwater Management Initiative (CSMI). MPE has been proud to be part of this CSMI regional collaborative process. The initiative being undertaken by the CSMI respects the interests of all parties concerned. The willingness and cooperation demonstrated in the development of the preferred solution by all partners will form a solid basis to move forward with the regional stormwater management solution proposed. MPE looks forward to the opportunity to assist CSMI in implementing the next phases of this long‐term solution. Should you have any inquiries with regards to the report, please do not hesitate to contact the undersigned. Yours truly, Daniel Parker, P.Eng. Senior Engineering Manager DLP/bl Enclosure Co‐operative Stormwater Management Initiative Final – April, 2014 EXECUTIVE SUMMARY The Co‐operative Stormwater Management Initiative (CSMI) was formed to assist municipalities and Western Irrigation District (WID) to work together to find an effective and feasible solution to an issue that affects each sector in different ways. In late 2011, both the municipal partners and WID ascertained there was a need to undertake a collaborative process with the aim to develop a sustainable stormwater management (SWM) solution for the region in order to assist future land development. CSMI required an engineering assessment of a preferred SWM option that they had developed. CSMI had previously completed a comprehensive evaluation of SWM options. This evaluation established a shared understanding of: . Current stormwater technology and options, . Each partner’s interests, and . Potential regional stormwater options that CSMI identified as meeting each partner’s interest. CSMI has proceeded to a more detailed engineering assessment of potential SWM (SWM) alternatives. The objective is to develop a SWM solution that: . Meets necessary water quality objectives for stormwater runoff, . Provides capacity for the projected stormwater discharge, and . Supports the various requirements of the CSMI Partners’ interests. CSMI is comprised of the: Calgary Regional Partnership (CRP), Chestermere Utilities Incorporated (CUI), City of Calgary, Rocky View County (RVC), Town of Strathmore, Wheatland County, and Western Irrigation District (WID). The objective is to ensure that both the municipal and irrigation sectors work together, share resources, and develop a mutually beneficial solution. The shared solution will provide: 1. WID with long‐term sustainability for an irrigation system that supports a vibrant agricultural economy, and 2. Municipalities with the certainty of growth and cost to allow continued urban development and economic development that will arise from it. THE REGION AND GROWTH The irrigation distribution infrastructure has become central to the regional drainage patterns of the CSMI area. The general nature of drainage is from west to east; starting just within the eastern boundary of the City of Calgary. The general study boundaries of the area are the City of Calgary on the west, Irricana and Rockyford on the north, the Bow River on the south and with its eastern reaches extending as far as the Standard and Crowfoot Creek. Engineering Assessment of Preferred Stormwater Management Options ii Co‐operative Stormwater Management Initiative Final – April, 2014 The region’s proximity to the burgeoning economies of Calgary and surrounding region has meant steady and continuous land development. Population growth within the Calgary region has fueled the expansion of goods and services, and the need for residential and other types of development. The specific growth areas studied include an areae on th eastern side of Calgary, and areas in and around Chestermere, Conrich, Langdon, and Strathmore. As this development grows, so too does the impact on water quality for the downstream receiving bodies. The area encompassed within CSMI area is separated into six study areas (See Table 1 and Figure 1). Each study area is experiencing its own development pressures, challenges, and of significance, they all share a single stormwater discharge point with an irrigation conveyance system. Table 1 Study Areas MUNICIPAL JURISDICTIONS LAND DEVELOPMENT ADJACENT STUDY AREA WITHIN AREA AREAS RURAL AREAS City of Calgary Belvedere, Shepard (Janet) Industrial 1 Highway 1 South Rocky View County None and West Chestermere Town of Chestermere 2 Highway 1 North Rocky View County Conrich, Delacour RVC North East Chestermere 3 Chestermere Town of Chestermere None South Chestermere 4 Langdon Rocky View County Hamlet of Langdon RVC South Wheatland Wheatland 5 Wheatland County Wheatland Industrial Industrial County Strathmore and Town of Strathmore West/North/East/South Strathmore Wheatland 6 Eagle Shores Wheatland County Eagle Shores County The growth areas (“Land Development Areas”) are expected to experience significant growth over the next 25 years. As part of the planning process, three milestone dates were used for estimating population and land use absorption. These were years 2016, 2024 and 2039. The population forecasts for each of these milestone dates were calculated based on existing planning documents for each study area. Generally, the growth rates for the CSMI region are approximately 2% to 4%. It was calculated that over the next 25 years there is an approximate population increase of 77,000 people. This will create a demand of approximately 7,621 ha of urban residential, industrial/commercial and country residential land development. Engineering Assessment of Preferred Stormwater Management Options iii WHEATLAND COUNTY ROCKY VIEW COUNTY KEOMA KATHRYN MACDONALD LAKE HWY 21 HWY C CANAL HWY 564 DELACOUR HWY 1 9 HWY SERVICEBERRY CREEK NORTH DALROY B CANAL LYALTA CONRICH HARTELL CITY COULEE OF CALGARY HWY 1 CHESTERMERE HWY 1 STRATHMORE CHESTERMERE WEED LAKE CHEADLE HWY 1 STRATHMORE AND SOUTH LANGDON WHEATLAND EAGLE LAKE EAGLE INDUSTRIAL LAKE HWY 24 HWY HWY 817 HWY LANGDON ESRD WH A CANAL CANAL A CANAL SIKSIKA I.R. CSMI MAIN CANAL STUDY AREAS MUNICIPAL BOUNDARY STUDY AREA BOUNDARY DEVELOPMENT AREA/ASP BOUNDARY (Ha) SCALE: N.T.S. DATE: APRIL 2014 JOB: 29159-001 FIGURE: 1 Co‐operative Stormwater Management Initiative Final – April, 2014 STORMWATER MANAGEMENT STRATEGIES AND OPTIONS Stormwater runoff within the region flows naturally towards the irrigation canal distribution system. Control of the nutrient loadings from planned and existing urban land development has proven to be a challenge. Stormwater runoff from rural areas also contributes to nutrient loading into receiving water bodies. High nutrient loads are a concern for receiving water bodies (natural and irrigation distribution systems). The impact of water quality affects the operation of an irrigation distribution system. The aim of CSMI is to develop “Sustainable Stormwater Management Options” for the region that is designed to meet the needs of both the municipal and irrigation sectors. Nutrient loading not only results from urban land development, but also from rural areas in the form of agricultural practices and natural processes that occur in the environment (i.e. erosion, nutrient cycling). Therefore, the SWM solution should consider both urban and rural, structural and non‐structural options and strategies. In essence, the overall SWM system to service the CSMI study area should strive to: . Manage runoff pollutants at source, . Control runoff volumes to minimize impacts on the receiving water body, . Ensure peak flow rates from urban land development meet ESRD Stormwater Drainage Standards and Guidelines, . Convey the stormwater to its ultimate end‐use or destination, and . Provide an ultimate endr‐use (o destination) of the stormwater. To minimize the impact of increased runoff volumes and poor water quality in the CSMI’s study area, the types of key stormwater Best Management Practices (BMPs) that can be employed in future land development areas include: . Minimize generation of runoff. Retain runoff on‐site through evapotranspiration, infiltration and/or reuse. Capture, hold and use runoff within a development or municipal area for reuse (green space irrigation). Treat stormwater using filtering and settling systems. Specific options reviewed included: 1) Source Control: Low Impact Development and Source Control Practices. 2) End‐of‐Pipe Control: Urban constructed wetlands and traditional wetponds stormwater facilities with or without reuse. It was found that a number of these practices are applicable for CSMI, particularly the application of Low Impact Development (LID) practices for reduction of runoff volumes. Although these water quality treatment techniques are being applied more broadly in other parts of the world, there is still significant local knowledge to be gained within Alberta (i.e. the design of these practices require “optimization” for phosphorus management). This is