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-----Original Message----- From: Sent: 6/28/2001 9:40:00 AM To: stormtalk Subject: Re: Design of drop pits I designed a similiar scenario for a large interchange project here in = Indiana. The difference with my scenario though is that it was a 1.05m = dia storm sewer carrying approx. 4 m3/s down a 3% grade. What I did was = ran the 1.2m storm sewer into a 2.4m dia drop manhole. I dropped the flow = approx. 5.5m to the another 1.05m outlet pipe. This outlet pipe then ran = to the discharge point at a small river where I capped the outlet with a = flapgate for additional energy dissipation. I then used very large riprap = in the outlet area to prevent erosion/scour. There isnt much in the way = of modeling or analyzing this type of layout that I was able to find. = Just good engineering common sense. I dont know what the whole story is with your design, but I am a little = concerned that your only using a 375mm pipe for that flow. Yeah the pipe = can carry that flow on that grade, but have you check the amount of head = that will be required at the inlet to get that flow into the pipe. I'm = not being nosy, but that is a lot of water to try and get into that pipe. I do have an autocad drawing that I could email to you for the drop = manhole and the flapgate. There isnt much to them though. I hope this helps. Truly, Brian Litherland P.E. Manager of Highway Design Bernardin Lochmueller & Assoc. 6200 Vogel Rd Evansville, In. 47715 Ph. 812.479.6200 Ext. 137 Fax 812.479.6262 brl@blainc.com =20 >>> geoffh@srw.com.au 06/27/01 06:43PM >>> I am designing a discharge pipe from a stilling basin that will occaisonall= y carry a flow of up to 60 ML/day (0.7 m3/s), with this flow being constant through the pipe, 24 hours a day, for maybe one or two weeks at a time. = At all other times, the pipe will not be utilised. I am planning to use a 375mm (15 inch) diameter pipe, with the pipe = running for approximately 100 metres and dropping around 13.3 metres in that distance. I am looking for assistance in designing a drop pit at the end of the pipe line to act as an energy dissipator - can anyone help (either directly = with design information or by directing me to where the information is) Thanks (in anticipation) Geoff Harris Projects Engineer Southern Rural Water 88 Johnson St, Maffra=20 Victoria 3860 Australia ph: +61 3 5139 3132 fax: +61 3 5139 3150 email: geoffh@srw.com.au=20 Any views or opinions expressed in this message or any attachments are solely those of the author and do not necessarily represent those of Southern Rural Water. Southern Rural Water accepts no liability for the contents of this e-mail or the consequences of any actions taken on the basis of information provided herein. This message and any attachments are confidential and are intended solely for the use of the addressee or = someone authorised to receive the addressee's e-mail. If you have received this e-mail in error, please notify the sender by return. Thank you.

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