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Rimma Vedom
Hydrology and Environment

Phone: 905 823 6088
Fax: 905 823 6088
Web site:

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Hydraulic Engineering

Developed the model for optimisation of discharge measurements on Standard Hydrometrical Network in Estonia. The model is based on Chezy-Manning equation of steady flow structure (1992).

Provided knowledge and control of usage of different forms of Q = f (H) ratio under different steady and unsteady, uniform and gradually varied conditions to calculate daily discharge at hydrometrical stations of Estonian hydrometrical network (1983-91).

Conducted the low-flow measurements using occasional materials for the control section creation (1992, 93); estimated of size of reservoirs according to social necessity, economical possibility, geo-morphology conditions and flow hydrodynamics (1976-79);

Made projects for control sections organising and construction at hydrometrical stations (hydrometrical bridges, culverts, weirs and permanent current meter and self-recorder booths maintenance) (1983-91).

Estimated of the wave size and speed of its movement over developed area in the case of dam collapsing (1985)

Conducted comparison and evaluated compatibility of routine discharge measurements on Estonian standard hydrometrical network with the Belgian methodology and computer system of Hydrological Databank Creation and Management (1993)

Estimated the flood bed formating discharge using the graphical method of turning point for kinetic energy curve (1979). Estimated amount of energy and heat that is brought by Estonian rivers into the Baltic Sea (1995).

Backwater curves model creation and applying for IGLD 1955 datum converting into IGLD 1985 datum for Iroquois, Saunders-Moses and Aguasabon dams (2001).


Soil Mechanics and Groundwater

Identified different types of soils and glacial deposits, their permeability and water conductivity coefficient, when opened new hydrometrical, agro-meteorological and complex water-balance stations as well as for chosen watersheds to estimate monthly water balance and calculate flow extremums of different probabilities. Was responsible for measurements of soil temperature, permafrosting, ground/underground water level and quality at hydrometeorological network had met the standard (Hydrometeorological Survey of Estonia, 1983-92).

Estimated average coefficients of transmissivity for 300 watersheds over Southern Ontario using GIS version of Quaternary Geology map M: 1:1000000 (2000)

Developed the SimpleBase model for the permanent groundwater discharge (baseflow) separation from total flow (2001).


Environmental chemistry

Was responsible for planning of river water sampling at the Estonian hydrometeorological, lake and bog network (chemical elements are SO4, Cl, NO3, HCO3, HCO3, oxide, NH4, Na, K, Ca, Mg, H, pH (1983-91).

Estimated daily loads of some contaminants into Lake Ontario via Etobicoke Creek using obtained proportions of it in different flow component: baseflow, intermediate and surface flow (2001): Chlorides and mercury


Environmental Data Collection and Analysis

Was responsible for procedure of initial hydrometeorological data production, treatment and archiving. Initial or primary treatment included transmission from point measurements into time and area averages. Provided the standard routine estimation of flow of different probabilities for current year and long-term time series of storm water, low-flow and average flow: “Hydrological characteristics of river flow of Estonia ” for 1975-80 and 1980-85 (1983-91).

Participated in surface water passportisation: systematisation of all water courses of former Soviet Union and computerisation of their geomorphological, hydrological, climatologic, social-economical and other information (1979 – Middle Ural, 1985 - Estonia). – WRIM gives outline of that

Participated in developing of Engineering standard of 1985: regoinalised the distribution of different functions (normal, lognormal, three-parametric distribution) of a random variables (year average, flood and low-flow) (1984-85).

Provided hydrometrical network design (the representative stations selection) using linear regression analysis (105 stations), taking into account the historical and social purposes of their establishing; double-mass integrating curves of precipitation-river flow (1989-90).

Used multiple linear regression analysis establishing the connection between daily snow pack depth, air temperature, precipitation and wind on different bog landscapes of Tooma Bog Station (1992).

Collected geo-morphological, -metrical and limnological data from topographical maps, scientific investigations and literature for 300 Estonian lakes of different origin (1992-94). – information was used for Usable Storage coefficient method

Used simple regression analysis for gap filling of 30-years daily flow data of Southern Ontario (2001).

Estimated parameters of linear, logarithmic and exponential curves for snow accumulation and melting models, exponential relation between effective and residual saturation in unsaturated grounds (2001). – see the Snow Model

Created the computer copy of Reservoirs of Ontario (2001)


Environmental Impact and Risk Assessment

Estimated risk of contamination limits exceeding against degree of land development (1976-79)

Water balance estimation and analysing, predicting its long-term changing (estimation of probable variations) for highly urbanised area of Middle Ural (1976-79).

Routine monthly water balance estimation and analysing its parameters changing (trends within 40-60 years) for selected watersheds (15), lakes (3) and reservoirs (2) (1983-91).

Performed routine comparison of monitored data with current standard limits: river’s and lake’s water, temperature and chemical regime changing, euthrophication, land and water sources development, -, (1983-91).

Managed the project of thermal contamination of Narva reservoir by thermal power station (1987-91)

Collecting, checking, and adding information of land development and changing of vegetation on watersheds of standard hydrometeorological network: creating and updating of Technical Files for current hydrological stations (1983-91).

Created monthly water balance structure for Estonia to estimate amount of water, energy and heating brought by Estonian rivers to the Baltic Sea, to analyse and predict possible impact and risk to excess water quality limits depending on degree of land development and increasing of population (1995).

Estimated the year average amount of substances transporting along Etobicoke Creek, amount of water used in residential, Office-business, government sectors of Etobicoke Creek (Water Resources Inventory Model) (2000).

Daily chlorides and mercury loads from Etobicoke Cr. Into the Lake Ontario for 1990-97 period (2001).


Sustainable Systems and Preventative Engineering

Estimated the minimal amount of water released from a reservoir to sustain river valley ecology using kinetic energy curves; computed “Ice storage” for use in agriculture; estimated the percentage of water allocated in industries with recycling technologies (1976-79).

Estimated a water balance and its forecast as basic information for strategy development and decision making (1979, 1995).

Was responsible for co-ordination of integrated monitoring (meteorological, hydrometrical, water quality and aquatic habitat) and its development at all stages from planning to report (1983-91).

Outlined the water management plan for Aguasabon GS reservoir taking into account environmental and development issues (2001)


Water Supply and Wastewater Treatment

Provided estimation of probable discharges of different Ural and Estonian known and unknown rivers for possible water supply and wastewater management (1976-91).


Engineering Hydrology

Applied water cycle in water balances in Water Economy Institute of Russia (water balance and budget), Hydrometeorological Survey and Institute in Estonia (water balance of Estonia, Usable storage coefficient model), National Water Research Institute in Canada (Equilibrium Water Balance Model)(1976-2001)

Estimated precipitation depth on watershed using arithmetical average (1976-98), Thiessen method and elevation-precipitation method (1993-98), multiple correlation method – R2 of distance from each station to examined area (2001).

Computation of snow accumulation and melting on watershed (Kuzmin method – 1976-91), radiation balance (1993), day-degree, U.S. Corps of Engineers method (1992-2001).

Developed three combined spreadsheet models of snow accumulation and melting (“adjusted”, “simplified” and “retention capacity” models) in NWRI (2001).

Routine estimation of infiltration coefficient at the Tooma peat bog and Kuusiku Complex Water Balance stations depending on initial water table level and intensity of precipitation (1983-91). Provided a standard procedure for measurement of water table reaction on rain event.

Implemented the hydrological method of river routing for estimation of the average and base flow changing from the very beginning (head) to mouth of Etobicoke Creek taking into account geo-morphological and hydrographical features into account (Water Resources Inventory Model 2000, EWBM 2001).

Estimated groundwater recharge-discharge zones, water table fluctuation depending on air temperature and geological composition of Etobicoke watershed using Equilibrium Water Balance Model (2001)

Provided a standard procedure for routine measurement of evaporation and evapotranspiration at the Tooma and Kuusiku stations in Estonia (evaporating pans and lysimeters) (1983-91).

Estimated evapotranspiration from watersheds as a residual of water balance equation and evaporation from lakes and reservoirs using thermo-dynamic method (1983-91).

Developed monthly water balance model for Beverly Swamp to estimate evapotranspiration from the swamp and applied the usable coefficient method to estimate flooded area and water table-outflow relationship (1999): see Beverly Swamp project

Provided a standard procedure of water table measurements in wells of hydrometeorological network in Estonia, developed baseflow separation spreadsheet model for ground flow estimation (1983-1991, 2001): see baseflow separation project

Provided a standard procedure for stream flow measurement at hydrometrical network in Estonia (1983-91), made measurements of summer low-flow on unknown Estonian creeks (1992, 93).

Applied HBV model (Sweden) for daily runoff simulation and prediction on Estonian creeks and rivers (1995, 96)

Did geo-morphometrical measurements of lakes (28) in Karela for stage- outflow ratio obtaining and analysing (1980).

Assessed quantitatively the regularity in stage-outflow relationship for natural lakes of different origin. Developed the Usable Storage Coefficient Method for water resources estimation using geo-morphological information of examined watershed (1992-95).

Made stream measurements (topography of valley, flow depths and discharges) on a 5 km plots to obtain hydrodynamic parameters of the Nadym River to estimate yearly dynamic of erosion and channel formation (co-op program 1973, 74, 75).


Industrial Wastewater Treatment and Control

Inspected the food, liqueur and tobacco industry wastewater treatment condition and fitting to the environmental standards (conformance/non-conformance).


Instrumentation and Process Control

Provided the following accuracy of observation and measurements on Estonian hydrometeorological network:

Precipitation (amount and form) 3-7 %
Snow depth (point) 1 cm below 20 cm
Water content of snow 2.5 –10%
Evaporation (point) 2-5%
Evapotranspiration (point) 5-10%
Wind speed 0.1 m/s
Water level 10-20 mm
Wave height 10%
Water depth 0.1 m, 2%
Width of water surface 0.5 %
Velocity of flow 2-5%
Discharge 5%
Suspended sediment concentration 10%
Water temperature 0.1-0.5°C
Ice thickness 1-2 cm, 5%

Provided regular control of all instruments, measurements and computation procedures used at hydrometeorological network of Estonia, for what planned, conducted and directed routine inspections, seminars and inventorying of running instruments: rain gauges, snow tubes, evaporating pans, lysimeters, anemometers, graduated vertical staff gauges, self-recorders, wire-weight gauges, current meters, air and water thermometers, suspend sampler (bottle) (1983-91).


Water Resources Engineering

Managed the transition from manual initial treatment of hydrological measurements to main-frame computer (1987-89) and then to PC using Russian software for initial treatment of hydrological measurements and observations (1991-93)

Created specific water balance data bank of Kasari river water basin for HBV model running and further application of it for forecasting and runoff simulation of any unknown Estonian river (1993-95)

Managed project of Estonian hydrometeorological databank creation and managing using Belgian GO6 component of HOMS Manual (1993-96)

Provided daily water balance data (precipitation, runoff, water table, air temperature, wind) and meta-data (information of structure of all available hydrometeorological data: synoptic, climate, agro-meteorological, water balance and hydrometrical) from Estonia for BALTEX (1994-96)

Developed procedure of climate, agro- and hydrometrical data exchange for operative monthly overview of Estonian hydrometeorological conditions (1996-97)

Provided routine daily data to assess and forecast of navigation conditions on Emajogi and Narva Rivers (1983-91)

Provided observation and quantitative control of Tallinn water supply system (3 reservoirs, 2 rivers and 3 channels), routine estimation of sources of water supply for different projects (1983-91)

Provided wave roughness, ice drifting and flimsy warning on the Lake Peipsi.

Voluntarily managed to create the monthly water balance from scratched data of Beverly Swamp for Geographical Department of Toronto University to estimate evapotranspiration and flooded area (1999)

Created monthly water balance structure for Southern Ontario area: from Durham to Windsor Municipalities (2001)


Management Concepts for Engineers

Yearly estimated and managed the human and material resources to run the Hydrological Department of Hydrometeorological Survey of Estonia (10 people in the office and over 120 in subordinated network) (1983-91)

Estimated expenses and costs for all hydrometeorological services and products to prepare them for selling to private consulting, construction and insurance companies as well as to estimate costs for any further internal and external hydrometeorological projects (1985-87)

Outlined the water management plan Aguasabon GS reservoir (2001).




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