The US Geological Survey tested the performance and effectiveness of the Basins in 1969. Their study analyzed data gathered from three basins located in both Nassau and Suffolk county. All three basins had different shapes and drainage area sizes in order to determine an average performance from all the systems. To determine the effectiveness, the basins were analyzed in three different areas: Precipitation-Inflow relation, Runoff Hydrograph, and Rates of Filtration. The three basins analyzed were located in Deer Park, Westhbury, and Syosset. The Deer Park recharge basin has a drainage area of around 118 acres serving mostly residential properties. The main basin is fed by 34 smaller open bottomed catch basins that are contained in the drainage area. The main basin is rectangular shaped, has a surface area of 1.4 acres, and lies 12 ft. below the ground. (Seaburn-Aronson, Influence of recharge Basins) The basins floor is made up of fine/medium sand with some silt and pebbles. The Westbury recharge basin has a drainage area of 15 acres in a residential area. The basin is rectangular shaped, has a surface area of 0.5 acres and has two levels. The lower level, which is designed to capture sediment and trash, is 12 ft under ground level. The upper level, which infiltrates water into the ground, is 10ft below ground. The floor is made up of “brown medium to very coarse sand and gravel and many thin lenses of silt and fine sand” (Seaburn-Aronson, Influence of recharge Basins) The last basin is the Syosset recharge basin that is located in Nassau county. It has a drainage area of around 28.8 acres which serves a mostly residential area. The basin is rectangular shaped, has a surface area of 1 acre, and also has two levels. The lower level is 14 ft below the ground and the upper level is 11 ft deep. The same materials that make up the Westbury recharge basin floor makes up the Syosset basin floor. Knowing the characteristics of each
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This will help determine how much actual flow of water is getting to the basin based on the drainage area it serves. The amount of inflow was recorded by digital water level recorders placed in manholes that serve inflow pipes as shown in Fig.4. In order to get an average measurement of the precipitation-inflow relation various storm data had to be obtained. The study collected data for 24 storms for Deer Park basin, 75 storms for Westbury basin, and 73 storms for Syossett basin. (Seaburn-Aronson, Influence of recharge Basins). Average precipitation to inflow data is shown on table 1. As precipitation increases the amount of inflow increases for all 3 basins. The amount of inflow differed for each basin because of the different drainage areas they serve. The Syosset basin has a much larger drainage area than the Westbury basin which is why when it rained 4.0 inches the inflow of the Syosset basin was 2 inches more than the Westbury. Although the Deer Park drainage area is almost four times bigger than the Syosset basin it contained a significantly smaller inflow. This is because the smaller basins feed the main Deer Park basin that is being studied. In those small basins some water is infiltrated resulting in less water ultimately reaching the main basin. Although the amount of water differs from each basin there is a steady relation in the percentage of
This will help determine how much actual flow of water is getting to the basin based on the drainage area it serves. The amount of inflow was recorded by digital water level recorders placed in manholes that serve inflow pipes as shown in Fig.4. In order to get an average measurement of the precipitation-inflow relation various storm data had to be obtained. The study collected data for 24 storms for Deer Park basin, 75 storms for Westbury basin, and 73 storms for Syossett basin. (Seaburn-Aronson, Influence of recharge Basins). Average precipitation to inflow data is shown on table 1. As precipitation increases the amount of inflow increases for all 3 basins. The amount of inflow differed for each basin because of the different drainage areas they serve. The Syosset basin has a much larger drainage area than the Westbury basin which is why when it rained 4.0 inches the inflow of the Syosset basin was 2 inches more than the Westbury. Although the Deer Park drainage area is almost four times bigger than the Syosset basin it contained a significantly smaller inflow. This is because the smaller basins feed the main Deer Park basin that is being studied. In those small basins some water is infiltrated resulting in less water ultimately reaching the main basin. Although the amount of water differs from each basin there is a steady relation in the percentage of