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«Table of Contents Table of Contents List of Tables List of Figures Appendices 1.0 INTRODUCTION 2.0 GENERAL WATERSHED INFORMATION 2.1 Plan Area 2.2 History ...»

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The mean monthly discharge and mean annual discharge (MAD) flow estimates (using Graham Creek unit area flow and McFarlane Ditch drainage area) is in the

following table:

McFarlane Ditch Mean Monthly and Mean Annual Discharge litres/sec

–  –  –

The flow in McFarlane Ditch was 0.36 litres/sec (0.013 cfs) on June 14, 1979 as measured by Brono Blecic (in report on water licence file 0341857).

A bathymetric survey of McFarlane Swamp was done by Ducks Unlimited in

1983. The surface area of the swamp is 28.63 ha (70.7 acres) at full supply level and the volume is 191.07 dam3 (154.9 acft).

–  –  –

This Unnamed (Repulse Point) Brook was mistakenly named Lacon Creek as it was believed to naturally flow from Lacon Lake. However the natural outflow from Lacon Creek flows west towards a confluence with Valens Brook. The estimated drainage area is 0.85 km2 (0.33 mi2).

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

–  –  –

This drainage area has two identified unnamed marsh areas with a surface area of 7.33 ha (18.1 acres). The lower in elevation of the two marshes is flooded and drained for agricultural activities.

3.3.4 Lacon Creek Lacon Creek flows from Lacon Lake toward the west and a confluence with Valens Brook before entering Baynes Sound. The estimated drainage area of Lacon Creek is 5.42 km2 (2.09 mi2).

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

–  –  –

Flow measurements of 1.16 litres/sec (0.04 cfs) on October 23, 1979 and 142 litres/sec (5.0 cfs) on January 20, 1988 where made on Valens Brook which is main tributary to Lacon Creek. These flow measurements indicate that the above mean

DENMAN & HORNBY ISLANDS WATER ALLOCATION PLAN

monthly and mean annual may be generous. Further measurements would be necessary to confirm or adjust the above estimates.

Lacon Lake is tributary to Lacon Creek. The surface area of the lake is 3.0 ha (7.41 acres). An estimated volume of the lake, using an estimated average depth of 2.6 metres (8.5 ft), is 78 dam3 (63 acft).

Upstream on Valens Brook, the largest tributary to Lacon Creek, there is an unnamed small lake and associated swampy area with a surface area 6.28 ha (15.5 acres). Still further upstream there is The Maddigan, a large marsh area with a surface area of 14.5 ha (35.8 acres). There is evidence of drainage improvements in The Maddigan for cultivation. Still further upstream on a side channel of Valens Brook there is an unnamed swamp with a surface area of 4.35 ha (10.7 acres).

3.3.5 Unnamed (Ferry) Brook The estimated drainage area of the Unnamed (Ferry) Brook is 1.37 km2 (0.53 mi ). This drainage area contains Avery Spring and Alonzo Swamp. An unnamed marsh, with a surface area of 7.59 ha (18.8 acres), has evidence of drainage improvements for cultivation.

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

Unnamed (Ferry) Brook Mean Monthly and Mean Annual Discharge litres/sec

–  –  –

3.3.6 Unnamed (Denman Point) Brook The estimated drainage area of the Unnamed (Denman Point) Brook is 0.77 km2 (0.30 mi2).

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

–  –  –

3.3.7 Unnamed (Northwest) Brook The estimated drainage area of the Unnamed (Northwest) Brook is 0.5 km2 (0.19 mi2). The stream flows from a small marsh area with a surface area of 6.13 ha (15 acres) and which shows evidence of drainage improvements for cultivation.

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

–  –  –

3.3.8 Gladstone Creek The estimated drainage area of Gladstone Creek is 1.57 km2 (0.61 mi2). The Gladstone Creek drainage has two small swamp areas with a total surface area of 1.41 ha (3.5 acres).

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

Gladstone Creek Mean Monthly and Mean Annual Discharge litres/sec

–  –  –

3.3.9 Birkenhead Creek The estimated drainage area of Birkenhead Creek is 2.68 km2 (1.03 mi2). The Birkenhead Creek drainage has four swamp areas with a total surface area of 6.98 ha (17 acres).1 Birkenhead Swamp is tributary to Birkenhead Creek. The flow from Chicadee Lake may overflow a low divide and flow into Birkenhead Creek when a beaver dam at the main outflow channel into Fillongly Creek raises water levels in the lake.

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

Birkenhead Creek Mean Monthly and Mean Annual Discharge litres/sec

–  –  –

3.3.10 Danes Creek The estimated drainage area of Danes Creek is 2.0 km2 (0.77 mi2). An unnamed marsh, with a surface area of 6.13 ha (15 acres), has evidence of drainage improvements for cultivation.





The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

Danes Creek Mean Monthly and Mean Annual Discharge litres/sec

–  –  –

3.3.11 Unnamed (Komass Bluff) Brook The estimated drainage area of the Unnamed (Komass Bluff) Brook is 0.61 km2 (0.24 mi2). The Unnamed (Komass Bluff) Brook drainage has two small swamp areas with a total surface area of 6.31 ha (15.6 acres).

–  –  –

3.3.12 Fillongley Creek The Fillongly Creek drainage area is the largest drainage area within the plan area at 12.81 km2 (4.95 mi2).

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

Fillongley Creek Mean Monthly and Mean Annual Discharge litres/sec

–  –  –

Upstream on Fillongly Creek is the largest marsh area on Denman Island, known locally as The Swale, with a surface area of 56.87 ha (140.5 acres). The Swale has evidence of drainage improvements for cultivation.

From a side channel a large swamp, known locally as Pickels Swamp, with a surface area of 17.21 ha (42.53 acres), flows into The Swale.

There are seven other significant swamps identified within this drainage, including Johanson Swamp and Cramer Swamp, with a total surface area of 10.34 ha (25.6 acres).

–  –  –

Further upstream of The Swale on Fillongly Creek there is Chicadee Lake. A bathymetric survey was done by Water Management Branch of the Ministry of Environment in June of 1981. The surface area of Chicadee Lake is approximately 13.8 ha (34.1 acres) at full supply level and the lake volume is 1,183 dam3 (959 acft). A copy of the Storage Capacity and Area Curves and the bathometry is in Appendix C.

Water levels on Chicadee Lake on Denman Island (08HB057) were collected for the months of April through October, 1977 and 1978, and April through September, 1979, 1980 and 1981. Water levels records indicate that the lake level drops between

0.034 metres (0.11 ft) and 0.760 metres (2.30 ft) from April 1 to the lowest lake level;

which occurs from August through September. The average water level drop is 0.362 metres (1.19 ft) for the period of record. Net annual evaporation loss from the surface is estimated to be approximately 0.3 metres (1.0 ft).

3.3.13 Unnamed (Longswamps) Brook

The estimated drainage area of the Unnamed (Longswamps) Brook is 2.43 km2 (0.94 mi2). The Unnamed (Longswamps) Brook drainage has three long narrow swamps that lie in a north-west to south east direction in approximately the centre of Denman Island with a total surface area of 10.53 ha (26.02 acres).

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

–  –  –

3.3.14 Ford Creek The estimated drainage area of Ford Creek is 3.74 km2 (1.44 mi2). Three small swamps named Aspen Swamp, Crabapple Swamp and Canary Swamp have a total estimated surface area of 1.1 hectares (2.75 acres) and may be tributary to Ford Creek.

Pipsissewa Creek is a tributary to Ford Creek.

–  –  –

3.3.15 Beulah Creek The estimated drainage area of Beulah Creek is 3.67 km2 ( 1.42 mi2). Slade Spring is tributary to Beulah Creek and may help maintain flow during the summer months.

The mean monthly discharge and mean annual discharge (MAD) flow estimates

is in the following table:

Beulah Creek Mean Monthly and Mean Annual Discharge litres/sec

–  –  –

3.3.16 Other Small Drainages There are many small drainages on Denman and Hornby Islands. Information from investigations and reports associated with water licence applications indicate that there is no significant flow from most springs or streams in these smaller drainages from mid-June or mid-July to the end of September.

–  –  –

4.0 INSTREAM FLOW REQUIREMENTS Maintaining the natural stream environment and instream uses is of paramount importance for present and future generations. Maintaining water for the fisheries resource is a key factor in maintaining instream flow requirements for water quality, wildlife, recreational, aesthetic and cultural values. The Ministry of Environment

Provincial policy is:

In situations where a water allocation decision will significantly impact instream uses of water, the comptroller or regional water manager may refuse the application or include water licence conditions to protect the instream use.

Instream fisheries flow requirements are based on a provincially modified version of the Tennant (Montana) Method.

–  –  –

In drainages where fish are present, the minimum flow required to sustain the fisheries resource for fair spawning and rearing habitat is 10% of the Mean Annual Discharge (MAD). Therefore, the Regional policies to implement the Provincial policy

are:

The minimum flow required to sustain the fisheries resources for spawning and rearing is 10% of the Mean Annual Discharge (MAD); unless a more rigorous analysis indicates a different minimum flow requirement.

For streams where the natural mean monthly flow falls below 10% of the MAD, extractive licensed demands should only be allowed for the period of months when the mean monthly flow is above 60% of the MAD

DENMAN & HORNBY ISLANDS WATER ALLOCATION PLAN

For streams where the mean 7-day average low flow falls below 10% of the MAD, extractive demands should only be allowed for the period of months when the mean monthly flow is above 60% of the MAD (Figure 1.3). Where the mean 7-day average low flow remains above 10%, then the 7-day low flow amount above 10% MAD is available) Withdrawals from natural water bodies (lakes, ponds, swamps and marshes) supporting natural fisheries resources shall not reduce the shoal area more than 10%.

The shoal area is the area from the lake shore at average summer lake level to a 6 metre depth.

No significant natural fish resources have been identified in any stream channels on Denman or Hornby Islands. The main limiting factor may be the lack of a sustained flow through the summer months. Some streams have been identified as having fisheries development potential and a salmon enhancement project is being considered for Beulah Creek and Slade Spring on Hornby Island.

Both Graham Lake and Chickadee Lake on Denman Island support resident fish populations. Therefore the instream water volumes may not be reduced in these lakes by more than 10% of the shoal area or 0.6 meters without supporting storage.

4.1 Graham Lake Instream Requirements Graham Lake maintains a natural population of resident fish. To maintain habitat for fish in the lake the shoal area or top 6 meters (20 feet) of the natural lake height shall not be reduced by more than 10% or 0.6 meters (2 feet).

4.2 Chicadee Lake Instream Requirements Chicadee Lake maintains natural populations of fish. To maintain primary habitat for fish in the lake the shoal area or top 6 meters (20 feet) of the lake height shall not be reduced by more than 10% or 0.6 meters (2 feet).

To prevent fish and debris entering intakes, adequately designed and constructed fish screens are required on both lakes that support fish.

–  –  –

There are 102 water licenses currently (December 1993) within the Denman and Hornby Islands Water Allocation Plan area. More than half of these water licences (53) are for domestic purposes for rural residential demands. Figure 5 illustrates the number of water licences issued for each purpose for streams within the plan area. There are 27 water licences for irrigation purposes, 15 water licences for storage purposes, 3 water licences for municipal waterworks purposes, 2 water licences for industrial purposes, 1 water licence for conservation and 1 water licence for land improvement purpose.

Figure 5: Number of Water Licences The total estimated average annual licenced water demand for the plan area is

955.9 dam3. Figure 6 illustrates the estimated average annual licenced water demands for each purpose under which water licences have issued within the plan area. The largest annual water demand is for irrigation purpose. The second largest annual water demand is for storage purpose; followed by conservation purpose, municipal waterworks purpose, industrial purpose, domestic purpose and finally land improvement purpose. The following table summarizes these annual water demands.

–  –  –

* Based on assumption that: Municipal waterworks demand and domestic demand is the authorizes maximum daily licenced divided by 2 to estimate the average daily demand. Industrial, irrigation, storage, land improvement and conservation licenced flow is a uniform demand over the year and licenced volume is the total annual demand; except Conservation (fish fence) which has no demand.

There is little or no flow during the low flow period of May through October.

Licenced water demand during this period requires storage to support and ensure water supply. Supporting storage is also critical to ensure water supplies for competing water uses and to maintain instream flow requirements for the fish resource. The estimated low flow licensed demand for each identified drainage area and for other drainages in the Denman and Hornby Islands Water Allocation Plan area is summarized in the following table.

–  –  –

* Based on an estimated 90 day period demand assuming that; irrigation and industrial demands are totally withdrawn over the 90 day period; domestic and municipal waterworks demand is the authorizes licenced maximum daily for 90 days; authorized storage balances demand and therefore is a negative demand over 90 days; land improvement and conservation are non-consumptive and therefore have no demand.

–  –  –

5.1 Municipal Waterworks Water Demand Two of the three water licences for municipal waterworks purposes are held by the Graham Lake Improvement District. The Graham Lake Improvement District provides a water service from Graham Lake, on Denman Island, to approximately 66 subdivision lots along the shore of Lambert Channel, between McFarlane Road and Keith Wagner Drive. The 12,045,000 gallon per year licenced water quantities (27 dam3

- 90 day low flow demand) are adequately supported by 38 acre-feet (46.9 dam3) of storage on Graham Lake.

The third water licence is held by the Shire Community Co-operative on Godfrey Springs on Hornby Island. The Shire Community Co-operative waterworks purpose licence is for 2,000 gallons per day (0.8 dam3 - 90 day low flow demand) and is supported by 1.0 acre-feet (1.2 dam3) of storage.



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