MEMORANDUM

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6 Ronrose Drive Concord, Ontario L4K 4R3 Tel: (905) 738-6100 Fax: (905) 738-6875 E-Mail: general@schaeffers.com T.O. Line: (416) 213-5590

To: Jim G. Koutroubis, P.Eng., Crozier Consulting Engineers From: Tiffany Mah, B.ASc. Date: February 2019 Our File: 2019-4736 Subject: RE: Floodplain Cut and Fill Analysis – H&H Capital Group Ltd. – City of

Barrie

The subject area is located west of Veterans Drive and north of McKay Road in the City of

Barrie, Simcoe County, Ontario.

Schaeffer & Associates Ltd. (herein referred to as Schaeffers) was retained to provide cut and

fill analysis for the floodplain area within the subject development.

A floodplain analysis was conducted based on post-development conditions as per the Sub-

Watershed Impact Study (SIS) and Watershed Boundary Adjustment Addendum, dated

2017-12-18 and 2018-01-30, respectively. According to the SIS, McKay Road and its

associated culvert crossing creates a backwater effect. To mimic existing conditions and to

ensure that the placement of fill within the floodplain does not impair the floodplain

behavior, a cut and fill analysis has been performed to provide compensatory storage.

The following memorandum discusses the analysis results and the methodology utilized to

ensure equivalent or greater floodplain volume will be provided at the ultimate condition

when the fill has been put in place.

Methodology:

The following guidelines have been used to perform the cut and fill analysis:

The majority of the existing floodplain is covered by a Natural Heritage System (NHS). Therefore, cut and fill earthworks are to be performed outside of NHS boundaries;

Incremental cut and fill analysis performed with a maximum increment of 0.3 meters; Provide a minimum of 6 meters for hazard access; Utilize post-development floodplain limit as per SIS; and Freeboard requirement of 0.3 meters above the floodline.

Floodplain Cut and Fill Analysis February 2019 H&H Capital Group Ltd. - City of Barrie 2019-4736

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The subsequent approach was taken to conduct the cut and fill analysis:

When there is a fill that results in a loss of floodplain storage at incremental depths up to the

regulatory floodline, it should be compensated with equivalent or greater storage volumes

through cuts. The proposed storage should be planned at incremental depths of 0.3 m

intervals corresponding to the proposed fill.

Analysis Results:

Since the NHS boundary is extended to the west side of the creek, the cuts for compensatory

storage is proposed to be provided at the same incremental elevations, along the east side of

the creek. The compensatory storage is proposed to be located on a hydraulically equivalent

site so as to provide additional floodable area such that flood elevations and floodwater

velocities are not increased at the site of fill. Figure 1 in Appendix A illustrates the proposed

cut and fill plan for the subject site.

In addition, fills are proposed to be extended to ensure that the minimum 6 meter hazard

access outside of the development limit is provided. Cross-sections of the subject area were

created at 20 meter intervals, as shown in Figure 2 in Appendix A. The compensatory

storage requirements for the subject area is summarized in Table 1 below.

Table 1: Cut and Fill Volumes

Section Elevation: 307.90m – 308.20m Elevation: 308.20m – 308.50m Fill Volume

(m3) Cut Volume

(m3) Fill Volume

(m3) Cut Volume

(m3) 0-20 0.00 0.00 0.00 0.00

20-40 0.00 0.00 0.00 0.00 40-60 0.00 0.00 0.00 0.00 60-80 0.00 30.30 0.00 30.90

80-100 0.00 132.80 0.00 77.60 100-120 0.00 169.00 1.10 61.00 120-140 4.40 72.30 81.50 14.30 140-160 4.80 16.90 193.50 0.00 160-180 0.40 43.40 128.60 8.30 180-200 0.00 76.00 21.50 14.20 200-220 0.00 71.30 6.40 26.30 220-240 0.00 27.60 0.40 65.10 240-260 0.00 0.00 0.00 95.60 260-280 0.00 0.00 0.00 82.50 280-300 0.00 0.00 0.00 31.60 300-320 0.00 0.00 0.00 0.00 320-340 0.00 0.00 0.00 0.00

Total Volume 9.60 639.60 433.00 507.40

APPENDIX A Floodplain Cut & Fill Analysis

McKAY ROAD WEST

McKAY ROAD WEST

THORNTON CREEK UPPER

BLK 56STORMWATERMANAGEMENT

POND

BLK 51HIGH

DENSITYRESIDENTIAL

STRE

ET A

FILL AREA

CUTAREA

CUTAREA

CUTAREA

NATURALHERITAGE

SYSTEM

NATURALHERITAGE

SYSTEM

FUTURESUBDIVISION BY

CROZIER

PROPOSEDSUBDIVISION BY

CROZIER

SCHAEFFERSC O N S U L T I N G E N G I N E E R S

S C H A E F F E R & A S S O C I A T E S LTD.

6 Ronrose Drive, Concord,

Tel: (905) 738-6100

E-mail:

Ontario L4K 4R3

Fax: (905) 738-6875

design@schaeffers.com

McKay Road W

Salem Road

Veteran's D

rive

N

FOR DETAIL REFER TO 4610WATERSAND RESIDENTIAL

SUBDIVISION PHASE 1 STAGE 1BY SCHAEFFER'S &

ASSOCIATES LIMITED.

LEGEND

CUTTING FLOODPLAIN

CUTTING FLOODPLAIN

FILLINGFLOODPLAIN CUTTING FLOODPLAIN

FILLING FLOODPLAIN CUTTINGFLOODPLAIN

FILLINGFLOODPLAIN CUTTING FLOODPLAIN

FILLINGFLOODPLAIN CUTTING FLOODPLAIN

FILLINGFLOODPLAIN CUTTING FLOODPLAIN

FILLINGFLOODPLAIN CUTTING FLOODPLAIN

FILLINGFLOODPLAIN CUTTING FLOODPLAIN

CUTTING FLOODPLAIN

CUTTING FLOODPLAIN

SCHAEFFERSC O N S U L T I N G E N G I N E E R S

S C H A E F F E R & A S S O C I A T E S LTD.

6 Ronrose Drive, Concord,

Tel: (905) 738-6100

E-mail:

Ontario L4K 4R3

Fax: (905) 738-6875

design@schaeffers.com