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Nicola River Watershed Present and Future Water Demand Study

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Nicola River Watershed Present and Future Water Demand Study FINAL REPORT NICOLA RIVER WATERSHED PRESENT AND FUTURE WATER DEMAND STUDY Prepared for: Prepared by: Nicola Watershed Community Round Summit Environmental Consultants Ltd. Table 17A – 100 Kalamalka Lake Road Box 400 Vernon, B.C. V1T 7M3 Merritt, B.C. V1K 1B8 Project 466-01.02 June 2007 June 7, 2007 Reference: 466-01.02 Nicola Watershed Community Round Table Box 400 Merritt, B.C. V1K 1B8 Attention Elizabeth Salomon-de-Friedberg Re: Final Report: Nicola River Watershed Present and Future Water Demand Study Summit Environmental Consultants Ltd. is pleased to provide the final report on the above-noted study. The report summarizes current water demands and actual use (where available) in the Nicola River watershed and compares these values with currently licenced quantities. Future water demands in the basin have also been estimated based on three assumed scanarios at two dates (2020s and 2050s). We trust this completes the assignment to your satisfaction. Please call me if you have any questions. Yours truly, Summit Environmental Consultants Ltd. Lars Uunila, M.Sc., P.Geo., P.H. Geoscientist Attachments: Final Report EXECUTIVE SUMMARY The Nicola River Watershed Present and Future Water Demand Study is intended to support the development of the Nicola Water Use Management Plan (WUMP). The principal objectives of the study are to: • Quantify current (2006) water demand by sub-basin and sector on an annual, monthly and weekly basis (August and September only) within the Nicola watershed; • Compare water demands with licensed quantities in the watershed in order to identify potential water licensing issues; • Evaluate irrigation efficiency in the watershed; and • Develop future projections of water demand taking into account expected growth and climate change. This report summarizes the methods used in the study and the assumptions that were necessary in order to develop water demand estimates, compile water licence information, and actual use data. An evaluation of this information was the principal task of this study. Agriculture demands the greatest volume of water (76%) annually in the Nicola watershed. By comparison, the industrial and domestic sectors represent about 11% and 8% of total annual demand in Nicola watershed, respectively. Water demand from the business/commercial, institutional, and recreation resort sectors represent the remaining 5%. Overall, 99% of the agricultural water used is for irrigation in the Nicola watershed. If irrigation efficiencies are assumed to be consistent with the literature (i.e. MAFF 2005), it appears that the current surface water licences are sufficient to meet the total irrigation requirement in all but the Middle Nicola (and Clapperton) sub-basins. In the Middle Nicola and Clapperton sub-basins (as well as other sub-basins) groundwater is used to meet irrigation requirements. Comparison of demands and licensed quantities in the non-agricultural sectors is not straightforward and is generally precluded by the overlapping water use between sectors and sub-basins and the relatively greater use of groundwater in these sectors. To assess future water demand, three (3) scenarios and two (2) time periods were modeled. Descriptions of each of the adopted scenarios are provided and the results are tabulated in order to Summit Environmental Consultants Ltd. FINAL REPORT Project #466-01.02 – Nicola Water Demand Study ii 7-June-2007 facilitate direct comparison with the current (2006) demand estimates. The following highlights the projected future water demands in the watershed: • By 2020, total annual water demand in the Nicola watershed is expected to be 4% higher than it is currently if “low” growth and no climate change were assumed (Scenario A). If climate change is accounted for (Scenario B), total annual water demand is projected to increase by 10%. If climate change and “high” growth were experienced across the basin (Scenario C), total annual water demand is projected to increase by 43%. • By 2050, “low” growth alone (Scenario A) is expected to increase total annual water demand by 14%. With the effects of climate change (Scenario B), total annual water demand is projected to increase by 22%. Under the influence of climate change and high projected growth, total annual water demands are expected to be 124% higher than it is currently. It is expected that by converting to more efficient irrigation practices it may be possible for the agricultural sector to reduce water use by 10% overall. Also, through a focussed demand management program up to a 30% reduction in water demand in the domestic, recreation and resort and institutional sectors could be achieved. Currently, a 30% reduction in these sectors would represent only a 4.0% savings overall. However, by 2050 a 30% reduction in water use by the domestic, recreation and resort and institutional sectors could represent a 10% savings overall. Potential savings in the industrial and business and commercial sectors is also possible, but since each business and commercial sector activity is unique, improvements in estimates for water use efficiency can only be made accurately on a case by case basis. The information presented in this report is intended to provide basic information necessary to develop a comprehensive Water Use Management Plan for the Nicola watershed. Before such a plan is developed, it will also be necessary to evaluate water supply and develop a better understanding of groundwater processes – tasks which are being initiated under the WUMP process. Summit Environmental Consultants Ltd. FINAL REPORT Project #466-01.02 – Nicola Water Demand Study iii 7-June-2007 TABLE OF CONTENTS LETTER OF TRANSMITTAL ................................................................................................. i EXECUTIVE SUMMARY....................................................................................................... ii TABLE OF CONTENTS......................................................................................................... iv LIST OF TABLES................................................................................................................. viii LIST OF FIGURES .................................................................................................................ix 1.0 INTRODUCTION....................................................................................................... 1 1.1 Project Background.................................................................................................. 1 1.2 Project Objectives .................................................................................................... 4 2.0 METHODS.................................................................................................................. 6 2.1 Organization............................................................................................................. 6 2.2 Process..................................................................................................................... 6 2.3 Study Tasks.............................................................................................................. 8 2.4 Information Review ................................................................................................. 9 2.4.1 Types of Information Reviewed .......................................................................... 9 2.4.2 Information Sources........................................................................................... 10 2.4.3 Specific Information Reviewed ......................................................................... 10 2.5 Consultation with Water Users .............................................................................. 20 2.6 Estimation of Current Water Demand ................................................................... 21 2.6.1 Agriculture......................................................................................................... 21 2.6.2 Industry.............................................................................................................. 31 2.6.3 Business and Commercial.................................................................................. 32 2.6.4 Domestic ............................................................................................................ 34 2.6.5 Institutions......................................................................................................... 37 2.6.6 Recreation and Resorts ...................................................................................... 39 2.7 Estimation of Future Water Demand ..................................................................... 40 2.8 Evaluation of Data ................................................................................................. 40 3.0 BRIEF DESCRIPTION OF THE NICOLA RIVER WATERSHED........................ 42 3.1 Location and Physiography.................................................................................... 42 3.1.1 Clapperton.......................................................................................................... 42 3.1.2 Coldwater........................................................................................................... 42 3.1.3 Guichon.............................................................................................................. 43 3.1.4 Lower Nicola ..................................................................................................... 43 3.1.5 Middle Nicola ...................................................................................................
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