Projects L32018 Flow Improvement In a joint endeavor with the Port and railroad company, Gravity Drainage District Four is collaborating to install drainage boxes which will improve the flow and drainage of this lateral. Projects All Projects L40009 Improvement L40016 Erosion prevention L32018 Flow Improvement L33003 Before and After Report an Issue Permits Jobs Menu All Projects L40009 Improvement L40016 Erosion prevention L32018 Flow Improvement L33003 Before and After Report an Issue Permits Jobs