Big dornick, medium sized gravel, purification stones, and wash aggregate are stacked in a purification pond, and water plants with excellent purification power are planted on the upper side of the pond. A circulation pump is installed on the upper side of the purification pond for automatically purifying and filtering water using purification plants during a process of circulating water from an ecological pond to the purification pond. [Reference numerals] (AA,NN) Stack natural stones(3-5), round stones； (BB) OVERFLOW 150A(reference an equipment drawing)； (CC) Plant aquatic plants(refer to a planting plan)； (DD) Spread river gravel (D50-100 THK 100-150)； (EE,GG) Nonwoven fabric(300g/m)； (FF) Ecological waterproof sheets T1.5(H-EDDM)； (HH) Sand compaction THK 100-150； (II) Rubble stone(mixed stone) compaction THK 50-100； (JJ) Ground compaction； (KK) Perforated drainpipe installation(double wall pipe D100)； (LL) Water surface(0-1.300mm)； (MM) Install a culvert (double wall pipe D100) and connect an end drain pipe as a natural type waterway정화연못에 굵은호박돌, 중간자갈, 정화석, 세척사 등을 적재한후 상부에는 정화력이 우수한 수생식물을 식재한다. 정화연못 상부에 순환펌프를 설치하여 생태연못의 물을 정화연못으로 순환하는 과정에서 여과 및 정화식물에 의해 수질정화가 자동으로 이루어져 깨끗한 물이 유지되는 구조이다.
