Hi Taye, I hope this email catches you in good spirits.
I have not heard back from you regarding my questions posed last week, but I wanted to follow up with #7 below: for the “streamflow
rate measurements” device, normally there are two flow ranges that are specified and it is important to match the flow with the minimum and maximum that you would expect in the field. You may not be able to match both ranges exactly, but which ever is more
important to you would try to match as closely as possible. For example, if you can indicate whether or not you would be measuring the high or the low flow range below:
Low is between 0.1 ft/sec to 4.9 ft/sec
High between 0.5 ft/sec to 25 ft/sec
Jonathon B. Drasdis, Laboratory Supervisor
Laboratory Safety Committee, Chair
Department of Civil & Environmental Engineering
261 Glenbrook Road, Unit 2037
Storrs, Connecticut 06269-2037
From: Drasdis, Jonathon
Sent: Friday, March 30, 2012 10:43 AM
To: 'Taye Alemayehu'
Cc: Mekonnen Gebremichael
Subject: RE: Field Instruments
Taye,
Thank you and it is good to meet you too! I have a series of questions for you regarding the list of field research equipment I
have reviewed with Dr. Mekonnen Gebremichael.
I will number the questions sequentially for each item requested the way they were proposed on the table presented to me:
2)
“Deep meter (up to 300m)”: There is actually a lot to consider here and it is also related to item # (4), but I will try to be brief but will describe two (2) methods. If you consider a water level meter, I immediately think about two possible techniques
in making the measurement.
Method 1:
There is the standard electronic tape measure which will allow you to lower the water sensing device to a depth (up to 300 m) and then take a manual measurement from the top of the tape. This is a one time measurement at each well and can not be left in the
well. Please see the following link if you are not sure what I am referring to:
http://www.rickly.com/sm/WaterLevelMeters.htm
Method 2: There is the water level recorder or pressure
transducer type. This will be a pressure sensing device that will detect how much water is above the sensor. This means the sensor is normally fixed in the well and left there permanently, or it is raised and lowered. It is best if set permanently and then
the data can be downloaded at the ground surface (top of well) without pulling the sensor from the well. You can collect data on 5, 10 15, 30 min, etc., intervals while the unit is left their remotely. Data can be collected periodically (once every few months
or more often if needed) by retrieving via computer connection. This will give a continuous record were as Method 1 will give only a single point measurement in time. However, Method 1 will give a longer use (maybe 10-15 yr service life). Service life on Method
2 could be 2-10 yrs. This is a good example of Method 2: http://www.solinst.com/Prod/3001/3001.html
3)
“Field Test Kit”: I found a fairly nice field portable meter that measures water temperature, electrical conductivity and pH with one probe. Are these parameters sufficient or do you feel that something more is needed?
7) “Stream flow rate measurements”: Can you give me a sense of the maximum expected velocity measurement needed? They make
different meters for various ranges of flow (high flow or low flow) and it will be good that we match the expected flow conditions as closely as possible so that we do not send something that is below the range of maximum flow (or vice versa). Just give a
range in m/sec.
8) “Laser range finder”: what will this be used for? What is maximum range distance (approximately) needed?
Please feel free to comment on any other issues that you have since considered and I will do my best to explain or consider while
picking out potential equipment.
Cheers,
Jonathon B. Drasdis, Laboratory Supervisor
Laboratory Safety Committee, Chair
Department of Civil & Environmental Engineering
261 Glenbrook Road, Unit 2037
Storrs, Connecticut 06269-2037
From: Taye Alemayehu [mailto:tay...@yahoo.com]
Sent: Thursday, March 29, 2012 2:34 PM
To: Drasdis, Jonathon
Cc: Mekonnen Gebremichael
Subject: Re: Field Instruments
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Dear Jon,
It is my pleasure to know you. You are welcome whenever you need my assistance.
All the best!
Taye
Taye Alemayehu
Geology, GIS, RS, Natural Resources Mgt & Environmental Geology (BSc., MSc.)
P.O.Box 30664,
Addis Ababa
Ethiopia
Telephone 251-116-457103 (Res.)/0911 212505(Mob.)
mailto:tay...@yahoo.com
--- On Thu, 3/29/12, Mekonnen Gebremichael <meko...@engr.uconn.edu> wrote:
From: Mekonnen Gebremichael <meko...@engr.uconn.edu>
Subject: Field Instruments
To: "Taye Alemayehu" <tay...@yahoo.com>, "Drasdis, Jonathon" <dra...@engr.uconn.edu>
Date: Thursday, March 29, 2012, 12:57 PM
Dear Jon and Taye:
I am writing to introduce you to each other.
Jon: Taye
is a PhD student in Ethiopia who requested the list of field instruments I shared.
Taye:
Jon is our lab manager, and he is helping us with field instruments acquisition.
Jon: please
feel free to contact Taye for further clarification on the requested items.
Thanks both,
Mekonnen
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