It can be curved to follow the contour of the ground and make turns where needed. The poly pipe offers strength but is light in weight. The poly pipe was chosen for several reasons. The situation required the material to be dredged from the lagoons and discharged at a distance in excess of 4000m. The pipeline to be used was 8 inch polyethelene pipe, butt-fused wherever practical. After meeting with VMI it was determined that the model MD-E615HN dredge along with a matched booster pump built by VMI would do the work. Saa & Angulo Construction firm of Cali was awarded the contract to dredge the lagoons. The system requirements demanded using a minimum of equipment plus offering flexibility to reduce costs and to use the dredging equipment for other tasks at a later date. After a trip to Colombia to view the situation it was determined that the dredging was indeed the only practical method. of Cushing, Oklahoma, about the possibilities of using a dredger. Henry Boschen, export manager of VMI, Inc. The next step was to devise a cost effective means of removing the sewage from the lagoons and discharging it into the river. It was determined that the sewage could be discharged into the nearby Rio Cauca river if careful attention was paid to the discharge rate and BOD load. This situation demanded immediate attention and the city turned to the environmental engineering firm Ingesam Ltd., headed by Mauricio Guerrero, to research a solution. The lagoons covered a 35 hectare area and to intensify matters, many of the poverty striken residents of the city had established make-shift dwellings on the edges of the lagoons.
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