Assignment 10 (a) Describe the method of construction of open wells () in a soil where a clayey stratum is encountered. (i) in rocky sub-strata.
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- A pumping test was made in a fine sand extending to a depth of 50 ft where a bed ofclay is encountered .The normal ground water level was at the ground surface.Observation wells were established at distances of 10 ft and 20 ft from the pumping well.A steady state was reached at a rate of pumping equal to 1.2 gpm .The drawdown atthe outer well was 0.5 ft and at the inner well 1.5 ft .What was the hydraulic conductivityof the sand in ft/sec3- An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G;= 2.68 as shown below. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 6 ft above the top of sand layer xaWAQ the clay, determine the safe depth of excavation before the bottom heaves. X. If an open excavation is to be made in Exploratory drill hole 10 ft 6 ft 4.5 ft Saturated clay SandA - Whilst drilling (8 3/8") section, at depth (9600 ft) a well kick was detected and the well was shut-in. Drilling supervisor instructed the mud engineer to increase mud weight from (9.8 ppg) to (10.2ppg) to control the well. 1- Determine the required amount of Barite (in sacks), to increase the mud density (9.8ppg-10.2ppg).
- B. Under certain conditions the Thiem equation (5-43) for confined aquifers, is equivalent to the Cooper-Jacob equation (5-58) for confined aquifers. What are the conditions? (This exercise is easier than Problem A.) C. If an analysis is made of the hydraulic conductivity of a site using permeameter tests of core samples, slug tests of monitoring wells, and pumping tests of production wells, it is often observed that the hydraulic conductivity as measured by each method is different. Which method would be most likely to have the greatest hydraulic conductivity, and which the least? What are some possible reasons why this would be true?32 Design an open well in coarse sand for a yield of 0.004 cumecs when operated under a depression head of 3 metres.Pumping test was carried out in a layer of soil extending to a depth of 28 m. The initial position of water table is located 4 m below the ground. Observation wells were sighted 33.5 m & 97.5 m from the pumping well. Water is pump at 248.4 m3/hr and when steady level was attained, the drawdowns at the observation wells were observed to be 1.1 m and 0.54 m, respectively. Compute the coefficient of permeability in m/day. CHOICES A. 64.82 m/day B. 71.49 m/day C. 71.49 m/day D. 78.09 m/day
- 8. The lower sand layer in the soil profile is in artesian condition. Calculate the maximum depth z of the proposed excavation. Standpipe 3.0 m 0.0 m 9 WT Sand Pary 1.70 Mg/m Paar-2.10 Mg/m WT 2.0 m Sand 4.0 m Clay Peat 2.10 Mg/m Clay 8.0 m Sand Sand (b) (a) Fig P-63D B. 2. 43 m C. 2.58m D. 2.76m A. 2.1 mfor the following conditions, determine the groundwater infiltration. new two lane highway, lane width 12ft; shoulder width 10ft; length of crack 20ft; rate of infiltration 0.5ft^3/day/ft^2; spacing of crack 25ft kp=15*10^-5 ft/dayA - Whilst drilling (8 3/8") section, at depth (9600 ft detected and the well was shut-in. Drilling supervi mud engineer to increase mud weight from (9.8 ppg control the well. 1- Determine the required amount of Barite (in sack mud density (9.8ppg-10.2ppg). 2- The mud engineer started to weighting up th- adding the required Barite the final mud density to poor suspension properties of the mud (low-Y amount of settled Barite in (Kg)? And wha recommendations/practices to avoid such issue? 3- After killing the well, drilling was resumed an massive bed of Anhydrate was penetrated. expect mud contamination be? And recommendations? Given data: Mud in tanks = 200 m³ Barite sack= 25 kg Barite density = 4.3 gm/cc 1 m³=6.28 bbl Best wishes .
- A municipal water treatment plant employs two circular primary clarifiers arranged in parallel, following the bar screen and grit removal chamber. The plant receives 5.0 MGD. Each clarifier is center-fed (water enters at the center and exits at the perimeter). The clarifier radius is 43.0 ft and depth is 10.0 ft. a) What is the hydraulic detention time in each clarifier? b) What is the hydraulic loading rate (critical velocity) in units of ft3/(ft2-hr)?A site consists of a homogenous dense silty sand layerof 8m thickness which is underlain by an imprevious stiff clau stratum. The initial water table was at 3m depth below the ground level. A pumping test was carrier out by pumping water at the rate of 0.7 m^3/min. Onservation wells were dug into the ground at 25m and 50m distances from the center line of the well. At steady state (i.e., when there was no change in water levels in the observation wells), the water levels in the two wells dropped by 500mm and 150mm, respectively. Determine the hydraulic conductivity of the clay sand layer.Q # 5. Discuss in your own words the cylinder spring model for the consolidation settlement in saturated clayey soil.