Mundy Creek Integrated Watershed Management Plan

City of Coquitlam Mundy Creek Integrated Watershed Management Plan

Terrestrial Habitat - North

Figure 2.11 Mundy Lake

Mundy Extent of Invasive Presence 1 - Lake

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Map Extent 4 Lost - SCALE 1:8,000 Lake C M Mundy 0 75 150 300 Meters ² Lougheed Map Drawing Information: City of Coquitlam, Dillon Consulting Limited, ESRI Base Layers, Wetland Coquitlam 2 Province of British Columbia Reserve Como Map Created By: ECH Map Checked By: KJ/NG

5 Map Projection: NAD 1983 UTM Zone 10N Mundy -

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Lost r 1 y r a M t C-6 Fraser u 7 PROJECT: 14-9299 b C- M i M -8 Fraser Fraser u r C nd T M STATUS: DRAFT y y v e r C d DATE: 1/19/2015 F r a s e r R i r n ee u k M File Location: G:\GIS\149299 - Mundy Creek\Figure 2.11 - Terrestrial Habitat - North.mxd MC-6 MC-7 MC-8

MC-5 Mundy Tributary 1

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MC-11 City of Coquitlam MC-14 Mundy Creek Integrated Watershed Management Plan The Sheep MC-15 Paddocks

Mundy Creek MC-16 Terrestrial Habitat - South MC-12 MC-17 Figure 2.12

MC-13 Extent of Invasive Presence Large Medium Small Area of Intact Vegetation Inaccessible Area Along Highway Mundy MC-18 Mundy Creek Habitat Compensation MC-19

Chines Scott/Hoy

Lost Lake SCALE 1:72,145 Mundy 0 75 150 300 Meters ² Lougheed Map Extent Coquitlam 2 Map Drawing Information: City of Coquitlam, Dillon Consulting Limited, ESRI Base Layers, Wetland Province of British Columbia Como Reserve

Map Created By: ECH Map Checked By: KJ/NG Mundy Map Projection: NAD 1983 UTM Zone 10N Port Coquitlam C oquit

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Lost r Dawes Hill Creek

Fraser PROJECT: 14-9299 Fraser Fraser STATUS: DRAFT F r a s e r R i v e r DATE: 1/9/2015

File Location: G:\GIS\149299 - Mundy Creek\Figure 2.12 - Terrestrial Habitat - South.mxd Mundy Creek Integrated Watershed Management Plan

In addition to the forested blocks, other terrestrial habitat within the watershed largely consists of landscaped residential properties. The extent and composition of this habitat varies considerably. Some properties maintain large areas of vegetation which include native vegetation, non-native plant species, or a mixture of the two. Some properties are largely devoid of habitat value with lawn and ornamental shrubs being the primary vegetation. Regardless, given the size and lack of connectivity to larger sections of intact vegetation, these areas have limited value and can be expected to be primarily used by common wildlife habitat generalists that are well-adapted to urban/suburban environments. Table 2.6 list the common plant species observed within the watershed.

Table 2.6: Common Plant Species of the Mundy Creek Watershed

COMMON NAME SCIENTIFIC NAME COMMON NAME SCIENTIFIC NAME

TREE SPECIES Douglas-Fir Pseudotsuga Menziesii Western Redcedar Thuja Plicata

Western Hemlock Tsuga Heterophylla Bigleaf Maple Acer Macrophyllum

Red Alder Alnus Rubra Sitka Spruce Picea Sitchensis

Shore Pine Pinus Contorta Var. Contorta Pacific Yew Taxus Brevifolia

Paper Birch Betula Papyrifera Black Cottonwood Populus Trichocarpa

Pacific Crab Apple Malus Fusca

SHRUB SPECIES Vine Maple Acer Circinatum Salmonberry Rubus Spectabilis

Cherry Laurel Prunus Laurocerasus Red Huckleberry Vaccinium Parvifolium

Beaked Hazelnut Corylus Cornuta Thimbleberry Rubus Parviflorus

Red Elderberry Sambucus Racemosa Red-Osier Dogwood Cornus Stolonifera

Himalayan Blackberry Rubus Discolour Mountain Ash Sorbus Sp. Twinflower Japanese Knotweed Polygonum Cuspidatum Linnaea Borealis

HERBACEIOUS AND OTHER SPECIES Bracken Fern Pteridium Aquilinum Deer Fern Blechnum Spicant

Sword Fern Polysitchum Munitum Lady Fern Athyrium Filix-Femina

Herb Robert Geranium Robertianum Horsetail Equisetum Sp.

Buttercup Sp. Ranunculus Sp. Yellow Lamium Lamium Galeobdolon

Large-Leaved Avens Geum Macrophyllum Piggyback Plant Tolmiea Menziesii

English Ivy Hedera Helix English Holly Ilex Aquifolium

Comfrey Sp. Symphytum Sp. Small-Flowered Impatiens Impatiens Parviflora

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Mundy Park The upper portion of the Mundy Creek watershed contains the watershed’s most significant terrestrial habitat, Mundy Park. Mundy Park is an urban park with dense vegetation and walking trails throughout. According to the Friends of Mundy Park Heritage Society, the original old-growth forest was logged in the 1920s. In addition to western hemlock and western redcedar, the original forest in Mundy Park also included significant areas of Sitka spruce and Douglas-fir. The secondary growth species consist of a mixture of deciduous woodland and coniferous forest. During the detailed field assessment, it was observed that the terrestrial habitat was comprised of approximately 60% deciduous species and 40% coniferous species. Common deciduous trees observed include bigleaf maple and red alder. The most common coniferous species observed include the western redcedar, western hemlock, and Douglas-fir. The forest canopy is made up of the mature conifer trees while the understory is made up of the younger conifers, deciduous trees, shrubs and herbaceous species. Dense understory is most common along pathways and areas with an open canopy and opportunity for sunlight. In areas where the mature conifers are densely situated, the understory is fairly sparse. Remnants from the old growth forest were observed throughout the park as decaying stumps and nurse logs. Also observed were numerous standing dead trees and snags. The understory is comprised of mostly native shrubs (e.g., salmonberry, thimbleberry, red elderberry) and native herbaceous species (e.g., various ferns). Invasive species do not appear to be abundant throughout the park, however, several patches were observed along disturbed areas around outer edges of the park.

Mundy Ravine The Mundy Creek ravine is a narrow, linear vegetated area surrounding Mundy Creek. The ravine contains many of the same terrestrial vegetation as Mundy Park; however, invasive species are far more abundant throughout the understory. The terrestrial vegetation throughout the ravine is a mixture of deciduous woodland and coniferous forest. During the detailed assessment, it was observed that the terrestrial habitat was composed of approximately 75% deciduous species and 25% coniferous species. Within the ravine, large patches of invasive species were observed with native shrubs (e.g., salmonberry, thimbleberry, various ferns) scattered throughout. English ivy was the predominant species observed throughout the terrestrial understory for much of the ravine.

Hickey Street Reservoir Park The Hickey Street Reservoir Park contains predominantly deciduous trees and shrubs with some coniferous trees scattered throughout. The park contains several tennis courts lined with ornamental shrubs and manicured grass. During the detailed field assessment, it was observed that the terrestrial habitat was composed of approximately 80% deciduous species and 20% coniferous species. Himalayan blackberry was the predominant species observed throughout the understory and in particular lining the parking lot and outer boundaries of the park.

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Dawes Hill Park Dawes Hill Park also contains predominantly deciduous trees and shrubs with coniferous trees scattered throughout. The park contains a playground located in the northwest corner. It was observed that the terrestrial habitat is composed of approximately 80% deciduous and 20% coniferous species.

The Sheep Paddocks The terrestrial habitat surrounding the Sheep Paddocks consists of primarily low-lying sun tolerant shrubs (e.g., salmonberry, fireweed, and hardhack), grasses and some deciduous trees (e.g., paper birch, alders, and black cottonwood).

2.2.4.2 Invasive Plant Species Invasive plants were found in greater abundance within the lower reaches of the Mundy Creek watershed where it is a more urbanized and disturbed environment. Similar to the riparian areas, common understory invasive vegetation included English ivy and Himalayan blackberry.

Invasive plant species are prevalent throughout the terrestrial understory. The following plant species were observed within the intact forested blocks and are considered to be invasive:

. Himalayan blackberry; . English ivy; . Yellow lamium; . Cherry laurel; . Japanese knotweed; and . English holly.

The length and extent of coverage of invasive species within the forested blocks is varied. Large swaths of English ivy and Himalayan blackberry were commonly found where anthropogenic disturbance was most obvious (e.g., access pathways for maintenance, culverts, roads, unsanctioned trails, bridges). In other areas, invasive presence is more moderate with species such as yellow lamium intermixed with English ivy. Coverage was low in some areas with only sporadic occurrence of small patches or single plants. Invasive plants occurring in smaller patches tended to be cherry laurel, Japanese knotweed, and English holly.

Please note that the invasive species presence indicated on Figures 2.11 and 2.12 are not intended to be an exhaustive inventory.

2.2.4.3 Wildlife Wildlife habitat within Mundy Park is suitable for a diverse range of species while wildlife habitat within the portion of the watershed located south of Mundy Park has been significantly impacted by residential development. As a result, wildlife utilization within the more developed sections of the watershed is likely restricted to species that are adapted to urban environments such as coyotes, rodents and raccoons or species that can easily disperse across the roadway network such as birds. There are exceptions however, as a black bear was recently observed in the Mundy Creek ravine south of Mundy Park.

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For the most part, wildlife presence within the industrial/commercial areas south of Highway 1 and Lougheed Highway is expected to be severely limited due to a lack of significant habitat.

Mammals Small mammals such as voles and shrews are expected, particularly within Mundy Park and the Mundy Creek ravine habitat. Rodent species such as squirrel, rats, and mice are expected to be common throughout the watershed given their adaptability to urban/suburban environments. Larger mammal presence has been observed within Mundy Creek. Based on the desktop review, mammals found in Mundy Park include black bears, deer, racoons, and cougars. One (1) deer was observed during the field assessment at the Sheep Paddocks. As referenced, a black bear was also recently observed in the Mundy Creek ravine.

Birds Birds are a common species within the Mundy Creek watershed. This is expected given that they are best suited to disperse across developed areas that would normally constitute barriers or obstacles for many species restricted to movement on the ground.

Passerines (i.e., perching birds) are the most common species expected within the watershed given that they make up the majority of species in British Columbia. In addition, the intact blocks of terrestrial vegetation and the landscaped properties provide habitat suitable for utilization by many species of passerine. Mundy Park provides good habitat for birds with the presence of tree stumps or “snags”. Based on the background review, owls (i.e., Great horned owl, Barred owl, and Northern saw-whet owl) and woodpeckers (i.e., Red-breasted Sapsucker, Hairy Woodpecker, Downy Woodpecker, Northern Flicker, Pileated Woodpecker) have been observed within Mundy Park utilizing the snags. Other species (e.g., Great Blue Heron, Canada Goose) are identified as occurring in both Mundy Park and the Sheep Paddocks. A Great Blue Heron was observed at the Sheep Paddocks during the field assessment. Raptors recorded within Mundy Park include an Osprey and a Cooper’s Hawk.

Herptiles Four (4) frog species have been recorded within Mundy Park: Pacific tree frog, red-legged frog, bullfrog, and green frog. Four (4) types of salamanders have been recorded within Mundy Park: Oregon salamander (or ensatina), western red-backed salamander, long-toed salamander and northwestern salamander. One anecdotal and unconfirmed siting of a coastal giant salamander has been recorded within the park. Several species of garter snakes are known to occur in Mundy Creek Park and two (2) species of turtles are found to occur in Mundy Lake, the western painted turtle and the red-eared slider.

2.2.5 RARE SPECIES AND POTENTIAL FOR BOTH AN AQUATIC AND TERRESTRIAL PERSPECTIVE A review of background material including the Species at Risk Registry and the BC Conservation Data Centre’s Species and Ecosystems Explorer database was conducted to determine the presence or potential for rare species in the watershed.

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The BC Conservation Data Centre is a provincial database which contains the complete list of species at risk under the British Columbia Wildlife Act. Species are assigned to a status category as follows:

. Extinct: a wildlife species that no longer exists . Extirpated: a wildlife species no longer existing in the wild in Canada but occurring elsewhere . Endangered: a wildlife species facing imminent extirpation or extinction . Threatened: a wildlife species likely to become endangered if limiting factors are not reversed . Special Concern: a wildlife species that may become threatened or an endangered species because of a combination of biological characteristics and identified threats . Data Deficient: available information is insufficient (a) to resolve a wildlife species’ eligibility for assessment or (b) to permit an assessment of the risk of extinction . Not at Risk: a wildlife species that has been evaluated and found to be not at risk of extinction given the current circumstances

Species on the red-list include any ecological community, and indigenous species and subspecies that are extirpated, endangered, or threatened in British Columbia. Species on the blue-list include any ecological community, and indigenous species and subspecies considered to be of special concern (formerly vulnerable) in British Columbia.

The Species at Risk Act (SARA) is the federal regulatory framework for plant and wildlife species considered at risk under Schedule 1. Schedule 1 species are those that are extirpated, endangered, threatened, or of special concern within Canada (definitions are similar to those under the British Columbia Wildlife Act). There is also a Schedule 2 list which includes species that have been designated at risk by the Committee on the Status of Endangered Wildlife in Canada before the creation of SARA but have yet to be reassessed and identified for inclusion on Schedule 1. The Species at Risk Registry is a federal database which contains the list of species at risk under SARA.

2.2.5.1 Mammals Of the Schedule 1 mammals identified on the Species at Risk Public Registry, only the Pacific water shrew has the potential to occur within the watershed. This species is typically found in riparian or wetland habitats often associated with skunk cabbage, red alder, and dense, wet blocks of western redcedar (Government of Canada, 2012). As such, if present, they would be expected to be found adjacent to Mundy Creek. According to the Friends of Mundy Creek, a Pacific water shrew siting has been confirmed within Mundy Park.

2.2.5.2 Birds Three (3) Schedule 1 bird species identified on the Species at Risk Registry have the potential to occur within the Mundy Creek watershed (Government of Canada, 2012). The Common Nighthawk prefers open and disturbed sites and has been known to utilize gravel rooftops for a portion of its life cycle. As such, it could be found throughout the Mundy Creek watershed. The Yellow-breasted Chat Southern Mountain Population prefers riparian environments and, as such, may be found adjacent to Mundy Creek and the Mundy Creek Tributaries. The Horned Lark strigata subspecies prefers sparsely vegetated areas and has been known to utilize open manicured fields which are present in the watershed. Both the

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Yellow-breasted Chat and the Horned Lark strigata subspecies are red-listed species under the British Columbia Wildlife Act, while the Common Nighthawk is not provincially listed.

According to the Friends of Mundy Park, blue-listed bird species previously recorded within Mundy Park include the Double-crested Cormorant, Great Blue Heron, and Peregrine Falcon.

2.2.5.3 Amphibians The coastal tailed frog is listed as a Schedule 2 Amphibian and a species of special concern on the Species at Risk Public Registry. The frog species is also provincially red-listed. According to the Urban Forest Guidebook by the Friends of Mundy Park Heritage Society, the coastal tailed frog may be present within the Mundy Park. The frog requires cold, clear mountain streams or creeks that are 0.5 to 15 m in width, have forested borders, have a bed of boulders or cobbles, and must remain ice-free in winter. The western toad (Anaxyrus boreas) and the northern red-legged frog (Rana aurora) are provincially blue- listed and are considered to be species of special concern under SARA. Please note that the potential for these rare amphibians is likely limited to Mundy Lake within the Mundy Creek watershed.

2.2.5.4 Reptiles The western painted turtle (Chrysemys picta bellii) Pacific coast population is provincially red-listed and considered endangered under SARA. The turtle has been recorded as present in Mundy Lake. The species is typically found in the shallow waters of ponds, lakes, marshes, and slow-moving stream reaches. The potential for this species is likely limited to Mundy Lake within the Mundy Creek watershed.

2.2.5.5 Ecosystems A review of the City’s “Draft Environmentally Sensitive Areas Management Strategy for the City of Coquitlam” (Jacques Whitford-AXYS, 2006) indicated that according to the Conservation Data Centre’s database there are six (6) red-listed and eight (8) blue-listed ecosystems with the potential to occur in those parts of Coquitlam that are within the CWHdm biogeoclimatic zone. All the red-listed ecosystems are located in the northern portion of the City. Small parcels with the potential to support blue-listed ecosystems are located to the south of the watershed. Given the disturbed nature of the Mundy Creek watershed, the potential for any of these listed ecosystems to occur is limited.

2.2.5.6 Plants A review of the Species as Risk Registry indicated that one (1) Schedule 1 rare plant has the potential to occur in the watershed, the phantom orchid. The phantom orchid is also a red-listed species under the British Columbia Wildlife Act. Its primary habitat is the humus litter in coniferous forests with little or sparse ground cover. It is often found at the base of mature birch trees (Government of Canada, 2012). The species prefers low mountains or hills, where it usually occurs on south- or west-facing slopes. Please note that this habitat potential within Mundy Creek watershed is likely limited to Mundy Park. Although not red- or blue-listed, the swamp gentian is a rare plant that is only recorded to occur in two locations in the Lower Mainland, Mundy Park and Burns Bog.

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2.3 Geo-Physical Conditions

2.3.1 HYDROGEOLOGY One provincially recognized sand and gravel aquifer (Aquifer 49 III B (9)) underlies the area [BC Water Resource Atlas, 2014]. The descriptive location of this aquifer, according to the BCWRA, is said to be Quadra Sands. There are no details regarding the depth, thickness or other physical properties, of the aquifer available.

As an identified data gap, there is little actual groundwater occurrence data (e.g., groundwater levels, hydraulic gradients) or groundwater discharge (baseflow) data and, as a result, annual and seasonal changes to the groundwater regime are not known. Continuous streamflow gauging, supplemented with groundwater well monitoring in specific and representative locations, could provide insights into the nature and extent of groundwater-related issues and challenges and also establish a baseline for future comparisons.

Refer to Section 2.4.2.3 for further discussion of the geological characteristics of the watershed and how these were incorporated in the hydrologic model as part of the capacity assessment.

2.4 Hydrologic and Hydraulic Assessment

2.4.1 SYSTEM OVERVIEW Figure 2.13 highlights the Mundy Creek drainage system assessed within the scope of this study, while Table 2.7 provides a watershed overview.

Table 2.7: Mundy Creek Stormwater System Model Inventory

COMPONENT TOTAL

Catchment Area 544 ha

Stormmain 45 km

Storm Watercourse 8 km

Storm Culvert 1 km

Storm Manhole 747

Storm Outlet 2

The primary drainage feature of the Mundy Creek catchment is the Mundy Creek. The creek source begins at Mundy Lake, which generally receives flow from Mundy Park (approximately 110 ha), and flows down a steep sloped ravine. The Lake also acts as a detention to the Mundy Creek. As previously described, flow south of the Lougheed Highway is directed to the east along the CPR Railway

P a g e | 51 Mundy Creek Integrated Watershed Management Plan watercourse, which ultimately drains to the Coquitlam River via a manually operated floodbox, which is closed during freshet periods. During freshet and high flow events, flows south of the Lougheed Highway culverts may overflow to the west, and eventually drain to the Fraser River via Dawes Hill Creek.

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Mund y Lake City of Coquitlam Mundy Creek Integrated Watershed Management Plan

g i Stormwater System Overview Mundy Creek H d Figure 2.13 e

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Map Checked by: Chuck Linders / Werner de Schaetzen r

Projection: Nad83 UTM Zone 10N

w a er PROJECT: 1150.0122.01

D iv er R Fras STATUS: DRAFT DATE: 08/09/2014

FILE LOCATION: Z:\Mapping\MAP\2014\2014-016-COQ\USL Template Maps\Figure 2-13 Stormwater System Overview.mxd Mundy Creek Integrated Watershed Management Plan

2.4.2 PHYSICAL MODEL DEVELOPMENT This section describes the steps taken to construct the Mundy Creek hydraulic model. The hydraulic model was built in accordance with the City’s XPSWMM Stormwater Modeling Standards, Conventions and Guidelines.

2.4.2.1 Collect and Review Background Data Prior to developing the model, information on the Mundy Creek stormwater system was compiled, collected and reviewed. This included reviewing the following pertinent information:

. City of Coquitlam’s GIS drainage infrastructure database . Relevant as-built drawings . Land-use and zoning maps . Orthophotos . Contour information . Site visits

2.4.2.2 Hydraulic Model Development The hydraulic model was primarily built using the City’s GIS database. To the extent possible, the model represents a one-to-one match with the City’s GIS complete with matching unique identification numbers for each component. Some additional elements, such as virtual junctions at location of y-connections were added to the model in order to satisfy the software requirements for system operation and continuity.

The model was built using the NAD 1983 UTM Zone 10 N coordinate system.

2.4.2.3 Data Gaps and Network Connectivity Analysis Following the creation of the network model, a data gap and connectivity review was completed. These reviews help to minimize simulation errors and increase the accuracy of the model results. To complete this task, an iterative approach was used where GeoAdvice worked cooperatively with the City to resolve data gap and connectivity issues.

A list of connectivity issues regarding the Mundy Creek GIS was reported in the document Questions regarding GIS Data received on March 24, 2011 and submitted to the City.

Watercourses were drawn manually in the model using the City’s existing watercourse GIS data. Watercourse geometry was estimated using the City’s topographic data.

The model was constructed using nominal conduit diameters. Conduit material was used to estimate conduit roughnesses as per Table 2.4 and Table 2.5 of the City’s Modeling Standards.

For the purpose of this study, the entrance and exit losses of the stormmain elements were assumed negligible. Watercourse culverts entrance and exit losses were assigned based on entrance and exit types using the values specified in Table 2.7 of the City’s Modeling Standards. Table 2.8 lists additional assumptions used to construct the model.

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Table 2.8: Model Data Assumptions

COMPONENT ASSUMPTION Default Roughness = 0.080 Storm Watercourse Default Shapes = trapezoidal Rim elevation = interpolated using DEM Storm Manhole Bottom elevation = lowest invert elevation

2.4.2.4 Hydrologic Model Development This section describes the steps taken to construct the Mundy Creek hydrologic model. The hydrologic model was built in accordance with the City’s XPSWMM Stormwater Modeling Standards, Conventions and Guidelines.

2.4.2.5 Subcatchment Geometry Subcatchments for the Mundy Creek storm system were manually delineated using the following data sets:

. Topographic data (contour data) . Property boundaries . Orthophotos . Infrastructure information (storm services, catch basins, drainage ditches, etc.) . Site inspection

The methodology used to estimate subcatchment width and slope can be found in Appendix C.

2.4.2.6 Impervious Coverage Available orthophotos were used to estimate the existing impervious coverage. Figure 2.14 below provides a sample of how the orthophotos were used to classify the existing impervious coverage. This existing impervious coverage was then used to estimate the imperviousness of each catchment.

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Figure 2.14: Impervious Coverage

Refer to the City’s XPSWMM Stormwater Modeling Standards, Conventions and Guidelines for detailed information regarding the subcatchment delineation methodology.

2.4.2.7 Soil and Groundwater Parameters To estimate the model soil parameter distribution, the subcatchments were overlaid with the surface geology information provided by the City of Coquitlam. Table 2.9 presents the local surface geology types and Table 2.10 provides a general description of the different soils.

Table 2.9: Surface Geology Class and Infiltration Type

SURFACE GEOLOGY CLASS DESCRIPTION

VC Vashion drift and Capilano sediments

Fc Fraser River sediments

SAb Bog, swamp, and shallow lake deposits

SAj,i Lowland and mountain stream deltaic, channel fill, and overbank sediments

Ca Capilano sediments

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Surficial geology maps indicate that soils within the watershed are mainly comprised of Vashon Drift (glacial soils) and Fraser River sediments. There are smaller regions of Capilano sediments and shallow peat deposits in the lower areas of the watershed.

The model utilizes the Green Ampt method to estimate the catchment infiltration characteristics. Table 2.10 summarizes the Green Ampt parameters utilized in the model.

Table 2.10: Green Ampt Infiltration Parameters for Soil Texture Classes

SATURATED INITIAL MOISTURE SOIL TEXTURE SURFACE AVERAGE CAPILLARY HYDRAULIC DEFICIT CLASSIFICATION GEOLOGY CLASS SUCTION (mm) CONDUCTIVITY (fraction) (mm/hr) Sand to gravel Ca 49.5 0.404 235.6

Silty to silt clay loam Fc, SAj,i 61.3 0.382 59.8

Peat sandy silt loam SAb 88.9 0.346 13.2

Sand gravel till refuse VC 166.8 0.368 6.8

P a g e | 57 Como Lake Avenue SAj,i

Mund y Lake City of Coquitlam SAb Mundy Creek Integrated Watershed Management Plan

g i Surficial Geology Mundy Creek H SAj,i d Figure 2.15 e

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VC SAb, Peat Sandy Silt Loam

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VC, Sand Gravel Till Refuse

w d SAb

K Fc

Note: Loughe r Culvert and ditch configuration within the Highway 1 corridor has ed Ca e SAb H d been altered as part of the ongoing Port Mann / Highway 1

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Fc Map Created by: Jonathan Hung Map Checked by: Chuck Linders / Werner de Schaetzen Projection: Nad83 UTM Zone 10N Fc

er PROJECT: 1150.0122.01 Dawes Hill Creek v er Ri Fras STATUS: DRAFT DATE: 08/09/2014

FILE LOCATION: Z:\Mapping\MAP\2014\2014-016-COQ\USL Template Maps\Figure 2-15 Surficial Geology.mxd Mundy Creek Integrated Watershed Management Plan

The groundwater module was included in the Mundy Creek model with the objective of incorporating the recession limb of the flow hydrograph. Table 2.11 present the groundwater parameters that were utilized in the model.

Table 2.11: Assumed Groundwater Parameters

SURFACE GEOLOGY CLASS PARAMETER FC, SAb, SAj,i, Ca VC Groundwater Parameters Upper Zone Depth (m) 0.6 0.6 Lower Zone Depth (m) 1 1 Constant Interflow Tailwater Depth – BC (m) 0 0 Invert Elevation of Interflow – BO (m) 1 1 Evapo-Transpiration Parameters Wilting Point 0.06 0.09 Field Capacity 0.11 0.23 Fraction of Max ET Assigned to Upper 1 1 Max. Depth of Significant Lower Zone Transpiration (m) 0.6 0.6 Infiltration/Percolation Parameters Saturated Hydraulic Conductivity (cm/hr) 21 1.32 Porosity Expressed as Fraction 0.36 0.45 Curve Fitting Parameter 0.1 0.01 Initial Upper Zone Moisture Expressed as Fraction 0.11 0.27 Coefficient for Unqualified Losses (cm/hr) 0 0 Av. Slope of Tension vs. Soil Moisture Curve 500 500 Groundwater Calculation Parameters Groundwater Flow Coefficient 0.8 0.08 Groundwater Flow Exponent 2.0 2.0 Channel Water Influence Coefficient 0 0 Channel Water Influence Exponent 0 0 Groundwater/Channel Water Coefficient 0 0

2.4.3 FIELD MEASUREMENTS ANALYSIS

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Table 2.12 below summarizes the field monitoring program. The objective of the field data collection was to collect sufficient flow and precipitation data to calibrate and validate the system model. Precipitation data was obtained from Metro Vancouver, while system flow data was provided by the City. Tide data was obtained from Water Survey of Canada.

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Table 2.12: Field Monitoring Program

NUMBER OF MEASUREMENT TYPE SOURCE MONITORING MONITORING PERIOD STATIONS Rain Metro Vancouver 2 April 2011 – May 2012

Flow City 4 May 2011 – April 2012 Water Survey of Tide 1 1965 - Present Canada

2.4.3.1 Rainfall Monitoring Metro Vancouver (MV) maintains a network of rain gauges across the Metro Region. There are no active Metro Vancouver rain gauges within the Mundy Creek catchment; however, Metro Vancouver has two rain gauges within proximity to the study area, QT10 and PQ38. Figure 2.16 presents the location of the two (2) MV rain gauges.

Table 2.13 summarizes the rain gauge data used for the analysis.

Table 2.13: Rain Gauge

RAIN GAUGE NAME ADDRESS ELEVATION

QT10 1111 Brunette Ave 16 m

PQ38 McLean Ave and Taylor St 70 m

The model was first calibrated using data from the rain gauge QT10. The precipitation from the lower gauge, QT10, was applied to catchments below 70 m. A factor of 1.17 was applied to gauge QT10 to account for the elevation difference and was used for the catchments above 70 m. This factor was used in the Como Creek Basin Drainage System Study by KWL and later validated in the Austin and Rochester Stormwater System Model Development and Calibration Study by GeoAdvice.

The rain gauge QT10 was offline from February 21st, 2012 to April 30th, 2012 due to the construction at Jackson Street and Brunette Avenue. This offline period falls within the validation period. Therefore, the model was then validated using the alternate gauge PQ38. The precipitation from the higher gauge, PQ38, was applied to catchments above 70 m. A factor of 0.86 was applied to gauge PQ38 to account for the elevation difference and was used for the catchments below 70 m.

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City of Coquitlam Mundy Creek Integrated Watershed Management Plan

Mund y Lake Metro Vancouver Rain Gauge Locations

y a Figure 2.16 w

g i

H Mundy Creek d e e PQ38 h Legend Watershed g u McLean Ave. & Taylor St., Port Coquitlam o L MV Rain Gauge North Mundy

Austin Avenue t

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t South Mundy

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t S QT10

a 1111 Brunette Ave., Coquitlam

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d v Lou r i ghe a ed H v R i e Note:

g l hwa y u m o a Culvert and ditch configuration within the Highway 1 corridor has B l High t

way 1 d i been altered as part of the ongoing Port Mann / Highway 1 e

t u Improvement project. Model will be updated once record drawing i

n q information is available.

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r 0 0.25 0.5 0.75 1 1.25 km

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i Map Data:

City of Coquitlam, GeoAdvice Engineering Inc.

Map Created by: Jonathan Hung s

Map Checked by: Chuck Linders / Werner de Schaetzen e Projection: Nad83 UTM Zone 10N w iver

a R raser

D F

PROJECT: 1150.0122.01

STATUS: DRAFT

DATE: 08/09/2014

FILE LOCATION: Z:\Mapping\MAP\2014\2014-016-COQ\USL Template Maps\Figure 2-16 Metro Vancouver Rain Gauge Locations.mxd Mundy Creek Integrated Watershed Management Plan

2.4.4 FLOW MONITORING The City had two (2) flow monitoring devices available to collect flow data in the Mundy Creek catchment. To maximize the spatial distribution of flow data in support of model calibration, flow monitors were moved several times to different locations during the data collection period. Figure 2.17 shows the location of the City’s flow monitoring sites.

Table 2.14: Flow Monitoring Program

SITE NAME LINK ID ADDRESS MONITORING PERIOD

1 Mundy Creek Intake STPI02416 2315 King Albert Ave May 20 to June 22, 2011 CPR Railway Crossing about February 25, 2011 to 2 CPR Crossing STCV0003 300 m NE of Lougheed Hwy and March 22, 2012 Colony Farm Rd May 29 to 3 Chilko STPI10467 2730 Nadina Dr June 27, 2012 STCV-GA1 Cape Horn culvert, near the March 1 to 4 Cape Horn (previously intersection of Cape Horn and March 22, 2012 STCV07998) United Blvd

The objective and description of each site are summarized below:

Site 1: Selected to monitor discharge from the large, mostly undeveloped, 106 ha upstream catchment. The site was also utilized to review the detention and flow attenuation impacts of Mundy Lake on Mundy Creek flows.

Site 2: Site 2 is the primary outlet of the Mundy Creek catchment. Site 2 is also influenced by the tidal boundary conditions of the Coquitlam River.

Site 3: Selected to validate discharge from a typical residential system. Site 3 captures a 12 ha residential catchment.

Site 4: Selected to validate Mundy Creek flow upstream of the Lougheed Hwy flow split. The site was also utilized to validate the Hillside groundwater regime. Site 4 captures a 234 ha mostly residential catchment. Site 4 also includes the Mundy Creek Intake catchment.

Appendix D presents the field data collected for Mundy model calibration and validation

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