Second Site-Visit SR&DT Batch 2 to Sumenep and Poteran Island
The second visit to Sumenep and Poteran island aimed to complete data needed to answer the problems posed from the first site visit in February 28th-29th and March 1st, 2015. The visit was completed in four days from May 28th-31st, 2015 to gather primary and secondary data.
Thursday [May 28th, 2015]
The first day of SR & DT Poteran site-visit was to visit Badan Metereologi dan Geofisika (BMG), Dinas Pengairan, and Perusahaan Listrik Negara (PLN) in Sumenep Regency to obtain secondary data. Arriving in BMG at 09.00am, the team explained briefly the purpose in coming there which was to request data for wind velocity and length of solar exposure to assess the feasibility of establishing Wind Turbine and Solar Cell in Poteran island. The Wind Turbine and Solar Cell are power plans to supply electricity for water pumps and Moringa/seaweed processing machine in support of establishing Bio-certified Moringa and Seaweed Production. The team also needed tidal period and seawater current data, however those data are not available in BMG. BMG provides 8 data which are: temperature, rainfall, humidity, evaporation, air pressure, length of
solar exposure, wind velocity and wind direction. From the data obtained, it turned out only Solar Cell which is feasible to be established because the average wind velocity per year in Poteran island was 2.5 m/s and the wind direction was unstable. To establish Wind Turbine, the wind velocity has to be at least 5 m/s and the wind direction has to be stable. Solar Cell is more feasible because the average length of solar exposure per year is above 50% (of 8 hours daylight).
Next, the team visited Dinas Pengairan at 10.30am to request data for the water resource locations, existing wells and specification of existing water pumps in Talango Village, Poteran island. These data are necessary to plot prospective water resources for Moringa irrigation. From Dinas Pengairan, the team obtained data of prospective water resource locations through the means of geoelectricity tool from the year of 2005. There were no records of the water pumps in Talango Village. Some water resources have saline water thus the drilling for the water was stopped.
The day ended with visiting PLN at 15.00pm to request data for the available electricity network and electricity capacity in each network in Poteran island. The available electricity network is 20 kV and PLN said they could provide more power supply. The cost of electricity per kwh is IDR 1,600. Later, the team will compare the data from PLN and with establishing the Solar Power Plant to see the efficiency of each data in order to support electricity for water pumps and Moringa/seaweed processing machine.
Friday [May 29th, 2015]
The second day the team did a preliminary experiment for small scale seaweed cultivation in a recirculating filtration system (Fig. 1). The data from the experiment is needed for the concept of floating pool with recirculating filtration system in Palasa Village. The day started by purchasing materials necessary for building the system. The team then went to the seaweed cultivation site in Palasa Village to collect fresh seaweed samples. The fresh seaweed was then placed in a bucket with recirculating filtration system and the physical and chemical seawater factors (pH, salinity, DO, and temperature) are maintained to support optimum growth of seaweed. Seaweed growth was observed morphologically for three days for changes of color and texture.
Fig. 1. Preliminary experiment for small scale seaweed cultivation in a rercirculating filtration system.
Saturday [May 30th, 2015]
The third day started by discussion for the data obtained from BMG, Dinas Pengairan and PLN. The team then went to Moringa cultivation site to obtain primary data for existing water distribution, well location, and fuel cost to fill water tank. The team also plotted the coordinates and map for the Moringa cultivation site. Land data and accessibility are necessary for feasibility analysis of Moringa distribution. The Moringa cultivation site is owned by three groups of farmers who had agreed to plant Moringa. Moringa will be planted on the perimeters of the farmers’ land. The team managed to cover Group One of the farmers’ land (Fig. 2). They calculated that the Group One’s land is 4.3 ha. The perimeter of the land is 1102.7 m, that means the Moringa that could be planted with plantation distance of 0.5 m are 10,151 trees.
Fig 2. Group One land plot for Moringa plantation site.
Other than that, the team also collected pests from the surrounding plants that would be planted with Moringa and also pests from Moringa in testing project land planted by SR & DT Batch One. These pests are to be identified. There are two wells in Group One land and the team realized that there was an issue for the water distribution because the farmers claimed that there wasn’t enough water to water the Moringa. However, from the team’s rough calculation after they compiled the data, there should be enough water. They presumed that the problem laid on the ineffectiveness of pipe installation and decided to continue the calculation the next day because it was already midnight.
Sunday [May 31st, 2015]
The team resumed the data compiling during the last day. They calculated theoretically the water distribution in pipe installation to confirm their presumption about the ineffectiveness of pipe installation. They tried to find the total head loss started by calculating volumetric flow rate, flow rate velocity, Reynold number, flow rate regime and head loss major. When calculating the head loss major ( ), the team realized that there was unknown variable which was L (pipe length). And then they went back to the head of the farmers’ group, Mr. Mat, to get further data about the water distribution especially pipe installation. They needed to know about the water distribution load (beban air yang harus dialiri) such as houses, mosques, ranches, Moringa plantation site, altitude difference between water tank and the users, number of pipe bending, dimension of pipe, number of tee connector, number of valve and type of fitting, number of nozzle. They gained data about pipe installation line, data of water usage in every user by volumetric flow rate meter (Debit meter), and difference between water tank and the users. But they couldn’t get further data about pipe installation because most of the pipes turned out to be installed 1 m below the ground. Though so, they got pipe length data through mark points (coordinates) in some places and that the dimensions of pipes for primary and secondary lines are different.
Fig 3. Piping on Group One land of Moringa.
Next, the team went to visit Padike Village to obtain fresh seaweed seeds in order to try to cultivate them in Surabaya using recirculating filtration system. They placed the seaweeds inside plastics filled with seawater and air (1:1). The seaweeds would only survive through that method in an air-conditioned vehicle.
These were all the data that could be obtained from the second site visit by SR & DT Poteran. The team still needed more primary data including Group Two and Three lands for Moringa plantation site.
