A major share of rainwater from the residential area located around Pärnamäe reservoir and Viimsi town flows through Viimsi manor park. The establishment of the sample area aims to use rainwater harvesting systems in the park to drain the soil in the territory of the park, protect the banks of the ditch that runs through the park from erosion by decreasing the flow rate in the ditch and to thus make the park more popular with the locals.
This project addresses the issue of the ditch situated in the south-eastern part of the park and its immediate surroundings. The area of the plot covered by the project comprises the excessively wet areas within approximately 5 m to either side of the axis of the ditch. The condition of the existing ditch is aesthetically unattractive. Grass is mown in the park every year, but the area around the ditch is overgrown in places. In addition, the park owner is planning a sanitary felling in accordance with the maintenance plan. Sanitary felling implies removing trees which are in a poor condition, obscure attractive views or grow in the ditch and on its banks.
In addition to a lack of visual attractiveness, the part of the park around the ditch in question is excessively wet. The result hoped to be achieved by deepening the ditch and improving water flow is the improvement of the soil water regime. Draining channels on either side of the ditch have been designed for the wettest areas. An even slope of the ground towards the ditch has been designed for the areas with the drainage channels. This will eliminate puddles and drain the rainwater flowing on the surface, which will improve soil water regime, and the trees in the park will be less susceptible to disease.
The landscaping design uses the materials already present in the park, which will fit in its historical atmosphere. In accordance with the design concept, the ditch winding through the park will remain but will be aesthetically connected to the upstream water bodies which have already been landscaped. Extensions have been designed to match the supportive park landscape which allows new elements to blended and to add to the character of the place rather than change it. Alternating sections with a wider water mirror or with water barriers and rapids make the ditch more interesting. A waterfall also used to be one of the elements of the park’s water system. It is unknown today where it used to be located. The greenery concept features the decoration of the ditch banks with various aquatic and shoreline plants while the ditch will still remain visible throughout its length. The greenery design envisages groups of plants.
The length of the ditch to be renovated is on 225 m. the area of the plot to which the design applies is 4,600 4600 m². The area within the project is to be landscaped. The location of the ditch to be landscaped will not change. In some places, the depth and slope of its bottom will change. The aim lies in retaining the ditch with a winding bank over its entire length. Changing the width of the ditch bottom will increase the water surface area in some places. Water barriers have been designed to prevent the rapid flow of water, to regulate the slope along the ditch in some places for the prevention of erosion, to create gurgle of water and diversify the atmosphere. Several connection points with stepping stones and a dam have also been designed for the dich. The pedestrian path along the dam is 2 metres wide.
In general, the ditch can be divided into three major sections: the fast-flow southern section, the overgrown section and the slow-flow section. The design enhances the diverse sections of the ditch, which makes this body of water more attractive.