User story: As an emergency responder, I want to evaluate whether the current heavy rains have pushed local streams above flood stage or to very high levels to help plan for emergencies.

Feature: Create data frame with historic peaks data. Enable filtering of data to sites in flood stage or well above historic averages.

Existing WW features: Flood tracking chart - https://waterwatch.usgs.gov/index.php?id=wwchart_ftc2 Table of (state-level) locations above flood stage - https://waterwatch.usgs.gov/index.php?id=2flood:w__table Map of flood and high-flow sites - https://waterwatch.usgs.gov/index.php?id=flood

Remarks: There are different thresholds used by different projects: investigate other options and determine whether we continue using Water Watch thresholds or switch to something else.