Question 1: The National Weather Service lists a monitor and flood stage of 18 and 21 feet, respectively, for the Hopland gage. These stages correspond to elevations (in NAVD88) of 518.5 feet and 521.5 feet, respectively. Also, the Hopland gage is located at cross section 84.78 (in river miles) within the HEC-RAS alternative. Is there enough information within the lifecycle that was run to estimate an annual chance of exceeding these two thresholds?

As shown below, not enough events were simulated on the more frequent end of the probability space to accurately estimate an annual chance of exceeding these two thresholds.  If this determination is required, the skip rules should be revisited in order to simulate more frequently occurring events. 

Question 2: Within the lifecycle that was simulated, what was the minimum, maximum, and average amount of time necessary to compute each HEC-RAS alternative event?
The minimum amount of time was approximately 27 seconds.  The maximum amount of time was 30.5 seconds.  The average amount of time was approximately 28 seconds. 
Question 3: Within the lifecycle that was simulated, what was the minimum, maximum, and average amount of time necessary to compute each HEC-FIA alternative event?
The minimum amount of time was approximately 3.6 seconds.  The maximum amount of time was 7.0 seconds.  The average amount of time was approximately 3.8 seconds.
Question 4: Within the lifecycle that was simulated, what was the minimum number of structures damaged within any event?
The minimum number of structures damaged in any one event was approximately 40. 
Question 5: Within the lifecycle that was simulated, how many events resulted in more than $2,000,000 worth of damage?
Approximately six events were simulated that resulted in an excess of $2,000,000 worth of damage. 
Question 6: If one of the purposes of the study was to accurately estimate the structural damages within the probability space spanning 0.99 annual chance exceedance (i.e., relatively frequent) to 0.02 annual chance exceedance (i.e., extremely rare), what modifications should be made to the HEC-WAT study?

The skip flag should be set to a lower peak flow rate.  This would result in more frequently occurring events being simulated within the HEC-RAS and HEC-FIA alternatives and provide better definition of more frequently occurring damages within the modeling domain.

Additionally, more events per realization should be simulated.  This would result in additional rare events being simulated within the HEC-RAS and HEC-FIA alternatives and provide better definition of rarely occurring damages within the modeling domain.

When 10 realizations, each consisting of 1000 events, are simulated with a skip rule set to the approximate 1/2 annual chance exceedance peak flow rate at the WestFork location, the resultant number of structures damaged- and aggregated damage-frequency relationships resemble Figure 2 and Figure 3, respectively.