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Chirchik basin

Project documents




RiverTwin project team of SIC ICWC led by Prof.V.A.Dukhovny (A.Tuchin, A.Sorokin, Dr.G.Stulina, O.Usmanova) took part in the training held since January 25 till February 5 and in the workshop (January 27-28) organized by University of Hohenheim within the framework of the RiverTwin project. During the workshop, the team reported about situation in Central Asian part of the project and the ongoing activities in WP-6 and WP-7. Before and after the workshop, SIC team had training and negotiations with all the partners regarding adoption of EU team to Chirchik subbasin proposed by models.

The gathering of information and preparation of DB is enough satisfactory and described by attached table. This don’t cause doubts about ability to use this DB for adoption of the models for CA conditions. Personnel of SIC together with sub-contractors developed successfully all methodic of work proposed by partners as SHPfile and so.

January 25, 2005, HBV/LARSIM.

J.Goetziger’s presentation.

  • Schematization of entities in HBV,
  • Basic equations,
  • Initial conditions,
  • Coupling of HBV with climatic scenarios,
  • Coupling of HBV with groundwater model MODFLOW,
  • Input information for HBV model,
  • Main results of HBV (output data),
  • Linking of HBV to the Neckar river basin,
  • HBV calibration in the Neckar river basin,

The HBV model simulates flow generation in catchment zone, based on certain gauging stations, and its further transformation along the river. Calibration is made on the basis of deviations between the simulated and measured flows in gauging stations.

The parties discussed the possibilities of applying HBV for conditions of the project basin comprised of the rivers Chirchik, Akhangaran, and Keles from view of its hydrological, technological, and information features.

a) Hydrological:

  • Three non-connected, in hydrological terms, flow generation zones of the three different rivers, which are connected through the system of canals in Flow dispersion zone,
  • Presence of glacier component in undisturbed runoff of each river,
  • High mountain zones with greatly variable slopes,
  • Low precipitation throughout the whole basin.

b) Technological:

  • Long-term regulation reservoir in the basin infrastructure,
  • Flow dispersion zones in the midstream and downstream of the rivers,
  • A lot of hydropower stations,
  • Large amounts of water withdrawal for agricultural production.

c) Information:

  • Small amount of gauging stations that do not entirely cover the flow formation zones,
  • Low frequency of measurements in gauging stations (monthly).

The parties agreed on the following:

Use the same structure in HBV-Chirchik as that adopted in HBV-Neckar, taking into account actual location of gauging stations and flow generation zones.

In view of specific features of the Chirchik-Akhangaran-Keless basin, it is planned to develop HBV-Chirchik in form of two separate modules, each representing Chirchik and Akhangaran rivers, respectively, with further linkage through the flow dispersion zones.

Add to the HBV-Chirchik model equations that describe dynamics of operation of the long-term regulation reservoirs, HEPS, and head intake structures.

Flow dispersion zones, including the Keles river basin should be separated from HBV-Circhik and considered as a separate task that provides linkage between HBV modules, as well as with tasks of agricultural, industrial, and public utility sectors.

The first HBV-Chirchik option is to be submitted for approval by 10.08.2005.

January 25, 2005. SLISYS

Thomas Gaizer’s (UH) presentation

SLISYS is considered as a system that includes the database and methodology.


  • Provide estimations of diffuse pollution into the water bodies (surface and ground waters) to the Surface water quality model MONERIS and to the groundwater model MODFLOW
  • Supply detailed information about soil properties to the hydrological model HBV
  • Estimate crop yield under changing climatic and management conditions (scenario runs)

The system SLISYS is based on database SOTER – Global Soil and Terrain database. The principles used in generating database in SLISYS will be followed for the Chirchik-Akhangaran basin. Data on 6 weather stations will be transformed into SLISYS formats.

The soil map generated in GIS for the Chirchik-Akhangaran basin on a scale of 1:200 000 will be used as a basis for selection of terrain and soil units. 31 soil units were selected. Main results of SLISYS application in Chirchik-Akhangaran basin will be submitted by 01.09.2005.

January 26, 2005, WEAP.

Oskar Wallgren’s presentation.

  • Schematization of entities in WEAP using the Neckar river basin as an example,
  • Description of relationships between the entities,
  • Input data for WEAP model,
  • Main results of WEAP (output data),
  • Linking of WEAP to the Neckar river basin,
  • Recommendations on application of WEAP in the basin comprised of the rivers Chirchik, Akhangaran, and Keles from view of its water supply specificities.

WEAP software is free and can be downloaded via Internet. Proposals on adaptation of WEAP software to conditions of the basin comprised of the rivers Chirchik, Akhangaran, and Keles will be submitted to Oskar Wallgren by 10.05.2005. As soon as possible, Mr. Oskar Wallgren should give permission from SEI for translation and realization of WEAP in Russian.

January 29, 2005, MONERIS/QUAL2E.

C. Kiourtsidis’ presentation – MONERIS.

MONERIS is a model that describes emission of nitrates and phosphorus in the river systems in Germany. Basic model elements are:

  • direct industrial discharges
  • wastewater treatment plants
  • urban areas
  • surface runoff
  • erosion
  • atm. deposition
  • tile drainage
  • groundwater

MONERIS is commercial software and Christos and Thomas are asking for permission to be used in Chirchik basin. The main difficulty in applying the model for other basins is a number of regression-type equations, coefficients of which were calibrated for specific conditions in Germany. The possibility of applying the model in Chirchik-Akhangaran-Keles basin will be analyzed by SIC ICWC and reported by 01.06.2005.

K. Zardava’s presentation – QUAL2K.

QUAL2K is a model that describes changes in water quality in the rivers and reservoirs under influence of temperature and hydrodynamic factors.

  • Schematization of river channel,
  • Main equations for one segment,
  • Equations of conjunction of river segments,
  • Initial conditions,
  • Coupling QUAL2K with climatic scenarios,
  • Coupling QUAL2K with the surface flow model HBV,
  • Coupling QUAL2K with the groundwater model MODFLOW,
  • Input data for QUAL2K,
  • Main results of QUAL2K (output data).

QUAL2K is written in VBA with interface in MS Excel; the model was passed in corpore for application to Chirchik-Akhangaran-Keles basin. There are not enough temperature and bioorganic data for direct application of QUAL2K in this basin. Therefore, the parties discussed the possibilities of developing the basin-specific option QUAL2K-Circhik based on data availability. During discussion of QUAL2K-Circhik development the parties agreed that there is no need to re-calculate discharge and velocity in river segments and in conjunction points in case of use of both QUAL2K and HBV models. Interface proposed for HBV-Circhik would be used as interface for QUAL2K-Circhik. The first version of QUAL2K-Circhik is to be submitted by 20.08.2005. Complete QUAL2K is proposed to use for evaluating water quality in fish productive water bodies in downstream of Chirchik and Akhangaran rivers where the necessary data are available.

January 31, 2005, Climatic scenarios.

Wei Yang’s presentation.

  • Brief description of global models,
  • Downscaling from global parameters to local ones,
  • Adaptation of local parameters using regression and classification methods,
  • Calculation options for temperature and precipitation dynamics for the Neckar river basin,
  • Calculation options for water resources formation dynamics for the Neckar river basin.

During discussion the parties agreed that water resource formation scenarios proposed for Neckar basin are acceptable only for flow generation zone provided that there is no anthropogenic impact. Methods of adaptation of global change to local conditions, application of greenhouse gas emission scenarios (IS92ab) and of models EHAM4 , HadCM2 are similar to both basins. Climate change scenarios developed by Hydromet and formally adopted for the region will be used in Chirchik-Akhangaran basin development scenarios. Proposals on scenarios prepared by Central Asian metereologists and by RIVERTWIN participants would be taken as framework for other models.

February 1-2, 2005

Presentations of Thomas Gaiser and Frank Michael Lange

The model consists of 3 sub-models:

  1. The soil water submodel
  2. The nutrient submodel
  3. The crop growth submodel

The model is designed to simulate soil erosion and crop productivity.

Model objectives:

  • Estimate effects of soil erosion on productivity
  • Estimate effects of management on soil, water, pesticide movement
  • Estimate the combined effects on soil loss, water quality and crop yield

Model components:

  • Weather generator
  • Hydrology submodel (runoff, soil water, percolation, subsurface flow, etc.)
  • Nutrient submodel (N,P,K)
  • Crop growth model (80 crops incl. major tropical food crops)
  • Management (tillage, irrigation, fertilization, liming, pesticides)

The EPIC model can be used at basin level in SLISYS system. The model should be calibrated on the field scale using all required reliable data (in two plots, 1 ha each).

February 2, 2005

Presentation of Thomas Gaiser

Demonstration of the model operation, structure of input files and generation of output files. The model version 3060 was installed in a computer of Chichik-Ahangaran basin representatives.


  1. The modern model version EPIC 3060 does not have the complete set of documentation: USER’S GUIDE, description of codes. Part of documentation is related to previous version and does not correspond to the latest one.
  2. EPIC 3060 is executed in DOS. This takes a lot of time to create input files. An interface to the database is available to create input files, but for a former EPIC Version
  3. Daily climatic data are recommended to simulate irrigation scheduling.
  4. There are 5 EPIC versions that have different configurations. Salt balance is performed by the model version of 1998 (EPIC salt) and probably in EPIC3060.

Finally, the model can be used for the Chirchik-Akhangaran basin.

February 1, 2005, MODFLOW

Roland Barthel’s presentation.

  • Structure of MODFLOW2000,
  • Schematization of objects in MODFLOW,
  • Main equations,
  • Initial conditions,
  • Boundary conditions,
  • Coupling of MODFLOW with the surface flow model HBV,
  • Input information for the model MODFLOW,
  • Main results of MODFLOW (output data),
  • Adjustment of MODFLOW to the Neckar river basin,
  • Calibration of MODFLOW in the Neckar river basin,
  • Interface for MODFLOW on the basis of PmWIN.

MODFLOW is a 3D groundwater model based on Boussinesq equations and realized in finite element method. MODFLOW includes a main body, which is distributed on free basis, and a number of interface options, most of which are commercial products. For implementation of MODFLOW-Chirchik, Roland Barthel recommended and provided non-commercial interface PmWIN, where, as an example, he created a simple model, demonstrated how to set-up simulated area and assign boundary and initial conditions. As a result of joint analysis of the Chirchik-Akhangara-Keles basin topography, the parties agreed that the model MODFLOW-Chirchik may be used only for areas located downstream of Charvak reservoir, from the side of the Chirchik river basin and downstream of Akhangaran reservoir in the Akhangaran river basin. This modeled area has a shape of unequal-sided horseshoe covering spurs of Chatkal mountain range and bordering Kuramin range on the side of the Akhangaran river and Karjantou range on the side of the Chirchik river. The spurs of Chatkal mountain range divide two groundwater lenses that are considered in given section as independent deposits mating through the surface runoff of Chirchik and Akhangaran rivers. The major difficulty in calibration of models like MODFLOW-Chirchik is that values of groundwater inflow from mountainous areas, which cannot be directly included in the modeled area, are unknown rather than large uncertainty of geological and hydrological conditions. In such situations one of the outputs is a tentative decision of auxiliary problem, the so-called “problem of finding” (recommended by R.Barthel), where the unknown values are the mean long-term inflows from mountains under specified water extraction, percolation coefficients of the soil and water planes in divided area and percolation coefficients from surface runoff. The resulted value of inflow is taken as the mean relative to which intra-year distribution function is generated, with further imposition of disturbances caused by climatic and hydrological parameter fluctuations. More detailed recommendations can be given only after analysis of the created model with specific characteristics. The parties agreed that the first option of MODFLOW-Chirchik should be submitted by 10.09.2005.

January 29, February 3, 2005, MOSDEW.

Andreas Printz’s presentation

  • General composition of RiverTwin project models,
  • Division of models into blocks,
    a) Hydrological,
    b) Economic,
    c) Environmental,
  • Description of model composition on each block for the Neckar river basin,
  • GIS-representation of indicators from each block,
  • Composition of spatial elements used for the Neckar basin,
  • Scheme of designed Database for the models

The parties discussed possible options and ways for interaction of the models in the Chirchik-Akhangaran-Keles basin based on its specific conditions, limited data availability, three relatively independent rivers, and presence of flow dispersion zones in downstream area. The first version of general model composition (MOSDEW-Chirchik, developed in CWSIR, A.Tuchin) with division into three blocks and order of their interaction for the Chirchik-Akhangaran-Keles basin is to be presented by April 2005.

SIC ICWC’s staff thanks all EC partners of RiverTwin project that took part in the workshop, training and discussions on further activities.


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