For steady state flow to a fully penetrating well in a confined aquifer, the drawdown at radial distances 1.56m and 1.80m from the well have been measured as 4.92m and 5.45m respectively, for a pumping rate of 36 cumec. The transmissivity (m²/s) of the aquifer is equal to

For steady state flow to a fully penetrating well in a confined aquifer, the drawdown at radial distances 1.56m and 1.80m from the well have been measured as 4.92m and 5.45m respectively, for a pumping rate of 36 cumec. The transmissivity (m²/s) of the aquifer is equal to

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Problem 3.5 A well of diameter 0.3 m is constructed to the full depth of an unconfined aquifer of thickness of 150 m. The water table is 10 m below the ground surface. A pumping test of 12 m'/hour has resulted a drawdown of 10 m. Assuming ro = 400 m; calculate the coefficient of permeability of the aquifer. If the flow rate increases to 18 m'/hour, and in the absence of any other data, what will be the best estimate for the drawdown in the well?
With an observation well situated is 69.7 ft away from the pumping well (which is pumping at the rate of 305 gal/min). The aquifer is confined, and the depth has been measured from well logs and is 150 ft. please show using this data how to calculate transmissivity (T), the hydraulic conductivity (K) and Storativity (S) for the aquifer. Thank You s (m) t (sec) 20.7 4074.3 30.76 6054.6 46.3 9054.6 67.33 13254.6 107.26 21114 152.67 30054 209.37 41274 305.38 60114 451.68 88914 671.44 132174 946.07 186234 1321.9 260214
QUESTION 11 1. The discharge from a fully penetrating well operating under steady state in a confined aquifer of 30 m thickness is 1500 liters/minutes. The drawdown observed at an observation well located at 20 m is 3 m. The transmissibility is 0.005 m²/s. Determine the location of the observation well with 0.5 m drawdown. Round off to two (2) decimal places, in m
A pump test was carried out in an unconfined aquifer of k = 3x10^-6 m/s with a flow rate of 25m3/hour. The radius of the well is 0.5m and the aquifer has a depth of 80m above an impermeable stratum. The drawdown in an observation well at a distance of 150m from the well is 2.5m. Calculate the depth of water in the well and the radius of influence??
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Problem 1. Consider a drainage system that consists of horizontal drains located at an elevation ho above the base of an unconfined aquifer of thickness b 10 m (see Figure 1). The recharge rate is r = 100 mm/yr, and the hydraulic conductivity of the aquifer is K = 1 m/d. The design condition of the drainage system is to avoid ponding at the ground surface. You can ignore the vadose zone for this problem. 1. Obtain the relation between the half-distance between drains, L, and the elevation of the drains, ho. Plot this function over the range of feasible lengths. 2. The cost of each individual drain can be split as the cost of the material (fixed) and the cost of installation (which is assumed to be proportional to the depth b – ho). If the fixed cost is $500 and the installation cost is $100 per meter of aquifer length per meter of depth, can you build a drainage system for less than $1 per meter of aquifer length? If so, what depth ho and spacing 2L would you choose? K= 1 m/day 2L = r…
8- 3 wells are sunk in a confined aquifer in a straight line at 25 m intervals. If one end well is pumped at rate of 300 m³/day, the steady state drawdown in the other wells was found to be 3 m and 2 m. Find the aquifer transmissivity. If all the wells are pumped at the same rate of 300 m³/day, what is the minimum drawdown between the wells?
QUESTION 1 Calculate the transmissivity of an artesian aquifer that has a thickness of 5.5 m and is pumped at a rate of 1.52 m³/min. There are two observation wells located at 150 m and 280 m away with drawdowns of 0.8 and 0.72 m respectively. (15) QUESTION 2 An aquifer has T = 175 m²/day, S = 1.3 x104, and provides a flow of 20 L/s to a well. Find the drawdown at the two observation wells located 15 and 65 m from the producing well after 1 day, 2 months, 10 months and 2 years. (15)
ENVIRONMENTAL ENGINEERING ( Practice Questions) a). Suppose a well 0.36m in diameter has been pumped at a rate of 3,000cu.m/day for a long enough time that steady-state conditions apply. An observation well located 30m from the pumped well has been drawn down by 1.0m, and another well at 120m is drawn down by 0.4m. The pumped well extends completely through an unconfined aquifer 60.0m thick. GIVEN: For an unconconfined aquifer, Q = πK(h2c1 – h2c2) / [Ln(r1 / r2)] Determine the hydraulic conductivity, K. (7 marks) (ii) Estimate the drawdown at the pumped well. State any assumptions made. b). A confined aquifer 40.0 m thick has two monitoring wells spaced 400m apart along the direction of groundwater flow. The difference in water level in the wells is 4.0m (the difference in piezometric head). The hydraulic conductivity is 40m/day. Estimate the rate of flow per meter of distance perpendicular to the flow. C). Suppose the aquifer, which has a…
Solve this question, please and find the permeability of the dam