I've got rainfall data (Time in inches and precipitation depth) in two separate columns in excel and I'm attempting to rearrange the data in one of the columns. Let's say I have a data range of 1 (Cell A1) to 100 (Cell A100). In the new column, I'd like to have the numbers rearranged where the...
I'm designing the riprap apron (and rock diameter size) for (4) four force main pipes that are discharging into a channel. The four pipes are spaced 1 ft. apart. Each individual pipe is 6 ft. in diameter with a flow (Q) of approximately 210 cfs. I'm using the HEC 14 publication, specifically...
Is anyone familiar with shutdown/turnaround project engineering/management? This is more in reference to the petrochemical field and the type of work involved with this job as it pertains to the plants, refineries, and offshore platforms. Does anyone have any experience, good or bad, that they...
I'm drawing a blank and hoping someone could guide me in the right direction. I'm designing the grading and drainage for a certain area that has a containment berm surrounding the entire site. The berm in approximately 4' high from natural grade with 3:1 side slopes and a 4' wide crown. The...
The proposed site is an underground gas storage facility. Currently the site is being drilled for future operations (storage). The post developed site will have 6" of crushed stone for the majority of the area (300' x 300') and will have an earthen containment berm (2:1 slope, 4' high)...
How would you calculate what is the head required to drive flow at 6 ft/s thru an open rectangular channel (5 ft wide and 15 ft deep), that has zero slope and that is approximately 90 ft in length?
I've helped design an addition to an existing sanitary sewer system that has two separate sewer pumping stations. One pumping station is existing and is being refurbished with new pumps and the other pumping station is new. I am unfamiliar with the proper aspects of corrosion protection (both...
Has anyone allowed or designed a gravity sewer to "penetrate" and pass through a stormwater culvert?
We are constructing a new building in a previously developed area with existing underground utilities. The new sewer (6") will be gravity (pvc) and will discharge into an existing sewer...
I'm looking for information into a pipe penetration of a corrugated metal pipe. I have a CMP pipe that is a 15" diameter slotted drain pipe. There are several downspouts coming off of an existing building that the owner would like to run underground with and tie into the CMP pipe. I would...
I've noticed on several details here in my office that for a concrete wet well (sewer lift station), the caisson section is keyed into the concrete base. There are no other notes or details for anchoring or connecting the sump to the base. Should there be some kind of anchoring to prevent...
I am trying to design a sewer line for a new public restroom. The only option is to install a wet well and force main to pump out the effluent (due to existing features a gravity line is not possible). Here are all of the knowns:
Proposed Wet Well - TOG = +16.0', Inv = +10.0'
Existing...
I've been going over some structural problems (situtations) for my own learning pleasure and am hoping that this post is in the right forum.
There is an existing run of pipe (x amount of length) that I would like to remove from under a canal. The soil is clay with varying shear strengths of...
I am laying out a gravity sewer line for a new building. There is a sewer lift station nearby that I would like to tie-in to. Are there any inssues with core hole drilling into the side of the existing SLS and allowing the effluent to drain directly into the sump? Is it preferable to run the...
I am trying to find a valve that will work with my particular situation. I have an 18" HDPE storm pipe that is located under a levee/berm for an industrial facility. I have proposed to use a valve on both the inlet and outlet of the culvert (for redundancy). The intent is to close up the...
In sizing pumps, I understand that it is an iterative process between choosing an outflow rate and what the available storage is in the drainage system and sump. My question is, what is the proper method to determine the inflow rate and volume of runoff getting to that sump? I realize that the...
I have drainage pipe that is a 48" corrugated metal pipe that is plastic laminated. What are the reasons/advantages to laminating a CMP? Is is to prevent corrosion?
Here's the situation. There is a lagoon that is capturing runoff from a particular site. The runoff from this lagoon is discharged in two ways, by (2)-48" gravity lines, and by (2)-36" force mains. Each of the gravity lines has a knife gate on the upstream end (in the lagoon portion). The...
I'm trying to figure out how RISA is using the "J" value for concrete properties. When comparing my hand calculations to RISA's results for a concrete 20" x 16" beam, the J's don't add up.
From my mechanical of material's text, the formula for J (polar moment of inertia) for a rectangular...
I was asked a question this morning pertaining to the relationship between storm intensities (i), and the area to which it is being applied. Most agencies give IDF curves or curve values for their particular area in order to calculate the peak flow (Rational method). This information is given...
I was asked to check on a design for a bioretention area. Another engineer calculated that a certain percentage of the flow from the design storm needed to be routed to the bioretention area and the rest could bypass to the main outlet. The method he used to calculate the flow is called the...
