2005-04-22 TUmphrey REZ 03-032 - Laserfiche WebLink

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keep a rain gauge out there and last year we had 123 inches in this part of Honalo and that adds up to a lot of water. And, from our rough estimates on this proposed development with the 27 parking lots and the 3 buildings, that could be well over a million gallons of water that they have to deal with. And all of this water because of the way Mamalahoa Highway is connected will go right down into the Kawanui Drainage way, right to the south of this property. And, so were very concerned because every gallon of water that comes off of this property will come right through our property and could have a impact on our house. So- and Im not sure whether a small dry well will have in control one million gallons of water. So basically what I was proposing is that you would have a heads up that this might be a big problem down the line but we wouldnt know what until another water event like last year. So, thank you. GALDONES:Commissioners any questions of Mr. Herbert? Commissioner Springer? SPRINGER:This is not a question for the testifier, but given his testimony Im wonderingifwereanticipatingthatConditionKaddresseshisconcernsandifwedoholdthat opinion, Im not sure that it does. It reads, All development-generated runoff shall be disposed of on site and shall not be directed toward any adjacent properties. A concern that I would have is that development may change the way water which is generated off of site moves across the site and have some of the impacts the testifier has articulated for us. And Im wondering if staff or the Director can let me know if Im on the right track. DARROW:This might be a better question for our representative from the Department of Public Works. If I might also bring your attention to Condition L as well, requiring a drainage study. GALDONES:Mr. Emler. EMLER:Okay, as you can see in Condition K, does address the requirement, which is our normal condition or requiring that all development generated runoff be mitigated on site. And that is generally done by dry wells or drainage sumps. Then to confirm that, that has been adequately addressed, we do require under Condition L that a drainage study be prepared by a licensed civil engineer and submitted to Department of Public Works prior to issuance or a construction permit so that would be either a grading permit or a building permit. SPRINGER:Mr. Chair. GALDONES:Commissioner Springer? SPRINGER:Im still wondering though the language reads, Development generated runoff, Im wondering if the development itself changes the way the water which is generated off of site, moves across the site is- would be noted in the drainage indicated in Condition L. EMLER:We would be looking at that in the drainage report. I would like to say that the requirement for the drainage report would have some level of mitigation regarding what is the recurrence interval of the storm, design storm. We would require that they address, at least under this condition, a storm having a 10% chance of occurring in 1 year. That would be the 10 11 EXHIBIT A