(PESIA) Weg naar Zee 2D Seismic - Staatsolie

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P-all consultants The canals are expected to have some impact on the swamp hydrology. The magnitude of this impact is unknown, but probably minor. At the moment the so called LVV canal with a sluice at the Oedraysingh Varma weg close to the crematorium is operational. The Ministry of Public Works is also engaged in building a new canal in the middle of the swamp area for drainage of the western part of the Weg naar Zee Block. Figure 7 Hydrology, Watercourses (canals and shallow swamp gullies) in the Study Area. Dry land Area Staatsolie Maatschappij Suriname N.V. PESIA Weg naar Zee 2D Seismic 2012 Human activities like deforestation and land reclamation, construction of dams, dykes, roads and canals through swamps have seriously affected the hydrology of wetlands in many locations in Suriname. These activities have resulted in either increased or lowered water levels, and in changes in drainage patterns and consequently in more or less drastic changes in the vegetation (and related fauna) and in the water quality. Most of the Dry land section of the study area used to be a wetland. Much has directly or indirectly been affected by human activities. On the clay soils polders have been establishe established establishe that drain their excess water through large canals towards major water courses. The higher land of 44
P-all consultants Staatsolie Maatschappij Suriname N.V. PESIA Weg naar Zee 2D Seismic 2012 ridges and leveled-up residential areas on clay soils drain into trenches that are also connected with such canals. Within the Dry land Area some areas have not yet been touched by human activities, but also here changes have occurred as a result of the improved drainage of the surrounding areas, and/or on account of fire. The drainage water from the Dry land Area will predominantly go to the Atlantic Ocean through the three main canals in the Weg naar Zee area. 4.2.8 WATER QUALITY Water quality assessment Water quality assessment was performed at two pre-selected localities: In the Dry land area near the Canal Brantimaka weg (N0553132, W05511265) and in the Wetland area Canal Staatsolie pump at Okrodam (N0552200, W0551511). Each site was sampled one time at the start of the long dry season. The results are presented in Table 7. Annex 3 is the report of the water quality measurements by de ADEK University laboratory. Table 7 Water quality measurements at Weg naar Zee Parameters Canal Brantimakaweg (N0553132,W05511265) 45 Canal Staatsolie pomp at Okrodam (N0552200, W0551511) Measurement Instrument Current Slow Slow dissolved 0.09 mg/L 4.66 mg/L oxygen Hach temperature 26.9 28.6 turbidity 11 NTU 14.2 NTU pH 6.7 7.24 Oakton salinity 1.54, 2.78 ppt 146 ppm transparency 55 cm 45cm secchi disk color analysis 267, 283 units Pt-Co 267, 283 units spectrophotometer APHA Pt-Co APHA According to Noordam and Teunissen, 2007 main factors affecting the quality of swamp water are the characteristics and the volume of incoming water (rain, flood water, discharge water from higher elevations), the chemical characteristics of the prevailing soils and peat in the area, the vegetation type, the depth and duration of inundation, and the effects of diffusion, dilution and/or concentration. The swamps generally have low oxygen content, with values changing over the day. Values are lowest in the early morning and increase during daytime. Oxygen is continuously consumed by decomposing organic materials, but during the daytime a considerable production of oxygen occurs by photosynthesis of algae.
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(PESIA) Weg naar Zee 2D Seismic - Staatsolie

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