TS MIRTSKHULAVA WATER MANAGEMENT INSTITUTE OF GEORGIAN TECHNICAL

TS. MIRTSKHULAVA WATER MANAGEMENT INSTITUTE OF GEORGIAN TECHNICAL UNIVERSITY ИНСТИТУТ ВОДНОГО ХОЗЯЙСТВА ИМЕНИ Ц. МИРЦХУЛАВА ГРУЗИНСКОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА THE RESEARCH OF THE COMBINE THREE TIER DRAINAGE Givi Gavardashvili, Doctor of technical sciences, professor Maka Guguchia Ph. D student Тallinn, ESTONIA 20 - 22 May - 2015

THE TOPIC OF THE PRESENTATION 1. The main features of the Colchis Lowland; 2. The three tier combined drainage Review; 3. The three tier combined drainage hydraulic calculation; 4. The three tier combined drainage field research; 5. Conclusion;

1. COLCHIS An ancient country on the Black Sea south of the Caucasus; the land of Medea and the Golden Fleece in Greek mythology. The name was given by writers in the early first millennium B. C. to the territory of the southeastern and eastern Black Sea region, after the Colchians, who lived there. In the sixth century B. C. , the Greek colonies of Dioscurias and Phasis arose there. In the sixth to second centuries B. C. , the Colchian Kingdom occupied Colchis which later became part of the various states of Georgia.

MAP OF COLCHIS LOWLAND • The area of Colchis lowland - 225 000 ha; • The climate is subtropical, overage rainfall index is between - 2100 - 2300 mm; • Broken terraces up to 100– 150 m high. • The mean January temperature is 4. 5°– 6. 0°C; • The mean August temperature, 23°– 24°C;

PALIASTOMI LAKE • 70 % of the Colchis lowland soils are loamy and clay; • Coefficient of filtration does not exceed K = 2. 10 -6 (cm / sec); • Gradient of slope i = 0, 0003 - 0, 0014; • Colchi valley lake - Palistomi, connects the Black Sea by strait; • Paliastomi water volume - 52 million cast. m 3, ; • The lake is located at an altitude of 0. 3 m. from the sea level; • The maximum depth - 3. 2 (m) and the average depth - 2. 6 (m)

2. THE THREE TIER DRAINAGE CONSTRUCTION Fig. 1 The new drainage construction that is proved by the Georgian patent certificate (Georgia patent # P 3573 ) is developed by the authors to provide the drainage system reliability. THE FUNCTIONS OF THE CONSTRUCTION ELEMENTS: • FIRST TIER DRAINAGE - is (I) for runoff water regulation so, it doesn’t stay in more the permitted time because of the risk of flooding and water logging; • THE SECOND TIER – the elliptical perforated construction (II) provides excessive moisture absorption from the soil and its transformation into the water flows. • THE THIRD TIER – intake pipe (III) that provides the water supply of the conductive channels, groundwater preservation necessary level and maintains moisture regime (routine).

3. THE THREE TIER DRAINAGE CONSTRUCTION HYDRAULIC CALCULATION Let us consider the combine drainage hydraulic calculating scheme given on the Fig. 2. Let us consider the so-called prism with the length - and the depth equals - for the tree-tier combine drainage. Fig. 2. The three tier drainage calculating scheme

. The prism flowing ground water consumption will be equal: , (cm/sec) (1) Where - is the same as the filter coefficient (cm/sec) and - is inclination. With Separation of variables, the second attitude will take the following form: (cm 3/sec) (2) If we make integral calculation, considering the boundary conditions and consider: (3) That the cylinder radius Does not match the three tier combine drainage elliptical shape surface, we will bring a new quantity , (cm/sec) (4)

If we are projecting the three tier drainage with the length ( ) the attitude will take the following form, , (cm/sec) (5) where, as we mentioned above is the three tier drainage elliptical knot (nod) form coefficient, which depends on the three tier drainage elliptical knot’s curative radius, which quantitative indices equals to: (6) When the three tier drainage works and the ground water level indicator falls at the (See Fig. 2. ). The ground water dynamic time stamp level gets steady: (m) (7)

Considering the magnitude (quantity) is and the attitude are regarded, we got that (7), (cm 3/sec). (8) The three tier combine drainage ground water maximum consumption ( ) which can carry the three tier drainage is calculated by the attitude, where - is the soil infiltration ratio, – is the drain emplacement depth (m), - is the distance from the curve of water falling to the drain (m), - is the perforated drain hole shape ratio and - is the elliptic drain diameter.

4. THE THREE TIER COMBINE DRAINAGE FIELD RESEARCH In order to establish the field experiment on the combine three tier drainage, was arranged the trial polygon in Didi Jikhaishi, Samtredia District agrarian college base(Fig. 3 ). There was arranged the trench in two rows with the length of 18, 0 m, depth - 1, 2 m and the width of 0, 6 m. The combine three tier drainage construction consists of: the first tier- fissure drainage (dept - 0, 30 m. ) for surface-water influence regulation, the second tiervertical circular polyethylene perforated construction for ground water adjustment(diameter r - 0, 10 m. , length - 0, 40 m. ) and the third tier intake manifold(conducting drain) to intake ground water from the area (diameter - 0, 30 m. ). In the Fig. 4 we can see three tier combine drainage field construction modeling technological cycle. Fig. 3

Fig. 4. The three tier combine drainage modeling technological cycle

CONCLUSION • Now the tree-tier combine drainage construction water intake capacity is ascertaining on the base of the field research. • The study object of precipitation in April 2015 Drainage system of water consumption amounted to 3 - 5 liters per minute taken by each drainage;

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