Hydrological data for small hydropower plants
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During last years extensive development of small hydropower plants has taken place, and many of that plants are frequently located in small catchments. Mainly there is no runoff data for these small catchments, because runoff gauging stations have been established in comparably larger catchments. For establishing runoff for small catchments it is common practice to downscale it from larger catchments analogue catchments. For downscaling analogue stations should have nearly the same catchment characteristics, like area, lake percentage, elevation distribution, etc. Small hydropower catchments often don t have lakes, it means that small catchments have faster runoff response and more peaked hydrographs, comparably to larger catchments. In this case scaling approach will lead to wrong design and disappointing results during operation. Underestimation of runoff data will lead to additional spill of water, and overestimation will bring to wrong installed capacity and may be would not be efficient at all. During past years consulting companies become very interested in more precise runoff data, even if it have been collected during not long time period. It has been decided to set a gauging stations near to projects and collect runoff data (even for short period). In the past 10 years SWECO AS company has collected runoff series for approximately hundred stations, which are located through all Norway. Collected runoff series are also very valuable for other hydrological computations, it could improve and adjunct NVE data for small catchment and supplement hydrological data where NVE has no stations. This study was made with permission of SWECO AS (Trondheim) and people who have paid for data collection.The objectives of the Thesis is to store all available runoff data to the database in proper format (using HEC-DSS programm), collect necessary information about each station and compute topographical and climatic parameters (using NVE Low-flow application), make a standardized description of each record (station) including all important information like location (GPS), map, photo, catchment characteristics, rating curve etc. and check the quality of data.In this project one of the objectives is to prepare runoff data series to transfer to NVE database in tidy and in the format that requested NVE.During Thesis work one of the objectives is to make an comparable analysis between SWECO stations data and NVE analogue stations. Data from NVE analogue stations was provided by NVE staff. Besides, relationship between topographical and climatic parameters with flow duration curves of selected SWECO stations should be estimated.