Setting up the laser to measure elevation changes along the south side of Whitelock St. (10/21/11)
Now that we've taken down the fence, opened up the tree wells, and dug up all the buried asphalt on the vacant lots on the south side of Whitelock St., we need to figure out a drainage plan. As part of the overall site plan for the community green space we're creating, we'd like to install a rain garden to capture the stormwater runoff flowing down the street pavement on Whitelock St. as well as the lot itself. Toward that end, we're working with Blue Water Baltimore to qualify for matching funds from their Water Audit Program, which seeks to help communities such as Reservoir Hill better manage and divert stormwater runoff. So how do you figure out how much the elevation changes as you walk down Whitelock Street?
Measure and mark 20ft x 20 ft grid marks to establish points of comparison:
Use a special receiver to capture the height of the laser readings:
Plot the findings onto a contour map:
Then project the contour map onto the map of the project site on Whitelock Street:
And then you find out that Whitelock St. isn't flat at all! In fact, the project site rises 7ft from the NE corner of the site (at Whitelock St. and Brookfield) to the NW corner (at Whitelock St. and Mason Alley).
Thanks to the South Whitelock Design Team, and, in particular, Carl Young, for helping to conduct the survey: