Make a preliminary estimate of the length and elevation

Reference no: EM13561566

A 5-ha residential development with 0.4-ha lots is to be drained such that the first 25mm of runoff is retained onsite and the postdevelopment peak discharge rate from the site is not to exceed 1m^3/s for thje 25-year 1-d rain event. The natural soil on the site is sandy loam. The IDF curve for the region is given by:

\(i = 7836/(34.110.7052t)\)

Where i is the average rainfall intensity in mm/hr, and t is the duration in minutes. The retention and detention areas are to have square bases with side slopes not greater than 3:1 (H:V) and regulations require that retention areas drain in less than 72hr. Determine the percentage of the ste area that should be set aside for retention and describe how this portion of the site should be developed. If the retention area is also to be used for the detention basin, make a preliminary estimate of the length and elevation of the weir crest in the discharge structure. Describe the physical appearance of the discharge structure.

Reference no: EM13561566

Questions Cloud

Descriptive material has negligible value : Descriptive material has negligible value and should be avoided. We are seeking analysis, discussion and recommendation, enriched by ideas found in journal articles.

Determine the lifetime risk of a resident : Consider a small town in the Phillippines, where the average weight of people is 55 kg, and the average lifespan is 60 years. The people here eat lots of fish due to abundant availability from the local river.

Determine the risk to the workers who work 8 hours/day : The natural air flow rate to this industrial shade structure is 90 m3/hour. Determine the risk to the workers who work 8 hours/day, 50 weeks/year for 30 years. Assume workers are 75 kg and live for 70 years.

Can you find bod10 from this test : During a BOD test, 2 mL of waste water having a DO of 0 was mixed with 298 mL of dilution water having a DO of 8.9 mg/L. After 5 days and 20 days, it was noted that the DO of the test bottle was 4.0 and 2.5 respectively,

Make a preliminary estimate of the length and elevation : A 5-ha residential development with 0.4-ha lots is to be drained such that the first 25mm of runoff is retained onsite and the postdevelopment peak discharge rate from the site is not to exceed 1m^3/s for thje 25-year 1-d rain event. The natural soil..

The peak time is 1 hour and the recession times is 2 hours : Route a trianglular hydrograph through a 100 foot wide rectangular channel with a bed slope of 0.015 and a Mannings n of 0.035. Take a distance between cross-sections of 3000 ft.

Determine their common velocity just after the collision : A steel column has a total unbraced height of 14 ft and carries an axial LRFD load of 950 kips. The column ends are fixed. Select an economical HSS 14x14 for this column.

Estimate the stopping distance required traveling northbound : Estimate the stopping distance required traveling northbound along University Drive towards campus assuming you are traveling at 40 mph under normal conditions.

Explain the working principles of two tests that can : Should the soil be compacted at the dry of optimum or at the wet of optimum condition in order to minimize the swelling potential? Briefly explain the reason for your answer.

User Account

All Pages