"At the Summit of Olympus Mons
Credit: G. Neukum (FU Berlin) et al., DLR, ESA
From martian orbit, the Mars Express cameras looked down on the largest volcano in the solar system. The result was this stunningly detailed overhead view of the…"
SWMM5 - Stormwater Management Model
SWMM 5, InfoSWMM, H20MAP SWMM, InfoSewer for Water Quality,Hydrology, Hydraulics
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Robert Dickinson replied to Robert Dickinson's discussion How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5?"Subject: Link Iterations in the SWMM 5 Dynamic Wave Solution
Each of the links in the SWMM 5 network can use up to 8 iterations to reach convergence during a time step in the dynamic wave solution of SWMM 5. The rules…"
Robert Dickinson left a comment for wu ze jian"Hi, I added this discussion http://swmm2000.com/forum/topics/how-is-the-st-venant-equation-solved-for-in-the-dynamic-wave-solu"
Robert Dickinson posted a discussionHow is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5?
Subject: How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5? An explanation of the four St. Venant Terms in SWMM 5 and how they change for Gravity Mains and Force Mains. The HGL is the water surface elevation in the upstream and downstream nodes of the link. The HGL for a full link goes from the pipe crown elevation up to the rim elevation of the node + the surcharge depth of the node. The four terms are: dq2 = Time Step * Awtd * (Head Downstream – Head Upstream)…See More
Robert Dickinson added a page to the group Hydraulics
Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow
Subject: Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow
You can model Force Main friction loss in InfoSWMM using either Darcy Weisbach or Hazen Williams as the full pipe friction loss method (see Figure 1 for the…
Robert Dickinson's blog post was featuredSWMM 5 Precipitation Options
Subject: SWMM 5 Precipitation Options You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative precipitation, use both rainfall and snowfall in the same rain gage depending on temperature, use both time series or external files for the rain gage and have unlimited rain gages with the limitation of one rain gage per subcatchment. …See More
Robert Dickinson posted a blog postSWMM 5 Precipitation Options
Subject: SWMM 5 Precipitation Options You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative precipitation, use both rainfall and snowfall in the same rain gage depending on temperature, use both time series or external files for the rain gage and have unlimited rain gages with the limitation of one rain gage per subcatchment. …See More
Robert Dickinson commented on Robert Dickinson's group Stream of Information"Pacheena Indian Reserve, British Columbia, Canada
May. 25, 2012
"
Robert Dickinson commented on Robert Dickinson's group Stream of Information"All the Water on Europa Illustration Credit & Copyright: Kevin Hand (JPL/Caltech), Jack Cook (Woods Hole Oceanographic Institution), Howard Perlman (USGS)
Explanation: How much of Jupiter's moon…"
Robert Dickinson commented on Robert Dickinson's group Water Quality"URBAN STORMWATER QUANTITY/QUALITY MODELING USING THE SCS METHOD AND EMPIRICAL EQUATIONS†
http://onlinelibrary.wiley.com/doi/10.1111/j.1752-1688.1997.tb04093.x/abstract
May 24, 2012
Wiley Online Library will be disrupted on 26 May from…"
Robert Dickinson commented on Robert Dickinson's group Water Quality"Hi MeHa, Here is one good source of data, I also have the SWMM 5 models for the USGS areas.
http://www.1000friendsofflorida.org/pubs/stmarksgreen/apend4.asp
http://sofia.usgs.gov/publications/ofr/78-324/ofr-78-324.pdf
"
MeHa commented on Robert Dickinson's group Water Quality"I want to model WQ of sewers. Can any body provide me a network with real measured calibration files? "
MeHa posted a status"Hello, When designing a sewer system, we consider the Node Flooding and Conduit surcharge in the status report. Is there any guideline which"
Quah Soon Tong left a comment for Esther Bergareche Auricenea"Hi Esther, I am not sure you are the same Esther that was at the United World College in South Wales with me. I am Quah Soon Tong from Singapore. I noticed you are also an engineer. I did Civil Engineering at Cambridge University, but practised as…"
Robert Dickinson commented on Robert Dickinson's group Stream of Information"River Canyon
May. 23, 2012
"
Robert Dickinson commented on Robert Dickinson's group Stream of Information"Litla Dimun, Faroe Islands
May. 23, 2012
"
World Population over Time
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Historical Estimates of World Population
(Population in millions. When lower and upper estimates are the same they are shown under "Lower.")
| Year | Summary | Biraben | Durand | Haub | McEvedy and Jones |
Thomlinson | UN, 1973 | UN, 1999 | USCB | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lower | Upper | Lower | Upper | Lower | Upper | Lower | Upper | ||||||
| 10000 BC | 1 | 10 | 4 | 1 | 10 | ||||||||
| 8000 BC | 5 | 5 | |||||||||||
| 6500 BC | 5 | 10 | 5 | 10 | |||||||||
| 5000 BC | 5 | 20 | 5 | 5 | 20 | ||||||||
| 4000 BC | 7 | 7 | |||||||||||
| 3000 BC | 14 | 14 | |||||||||||
| 2000 BC | 27 | 27 | |||||||||||
| 1000 BC | 50 | 50 | |||||||||||
| 500 BC | 100 | 100 | |||||||||||
| 400 BC | 162 | 162 | |||||||||||
| 200 BC | 150 | 231 | 231 | 150 | |||||||||
| 1 AD | 170 | 400 | 255 | 270 | 330 | 300 | 170 | 200 | 200 | 400 | 300 | ||
| 200 AD | 190 | 256 | 256 | 190 | |||||||||
| 400 AD | 190 | 206 | 206 | 190 | |||||||||
| 500 AD | 190 | 206 | 206 | 190 | |||||||||
| 600 AD | 200 | 206 | 206 | 200 | |||||||||
| 700 AD | 207 | 210 | 207 | 210 | |||||||||
| 800 AD | 220 | 224 | 224 | 220 | |||||||||
| 900 AD | 226 | 240 | 226 | 240 | |||||||||
| 1000 AD | 254 | 345 | 254 | 275 | 345 | 265 | 310 | ||||||
| 1100 AD | 301 | 320 | 301 | 320 | |||||||||
| 1200 AD | 360 | 450 | 400 | 450 | 360 | ||||||||
| 1250 AD | 400 | 416 | 416 | 400 | |||||||||
| 1300 AD | 360 | 432 | 432 | 360 | 400 | ||||||||
| 1340 AD | 443 | 443 | |||||||||||
| 1400 AD | 350 | 374 | 374 | 350 | |||||||||
| 1500 AD | 425 | 540 | 460 | 440 | 540 | 425 | 500 | ||||||
| 1600 AD | 545 | 579 | 579 | 545 | |||||||||
| 1650 AD | 470 | 545 | 500 | 545 | 500 | 470 | 545 | ||||||
| 1700 AD | 600 | 679 | 679 | 610 | 600 | ||||||||
| 1750 AD | 629 | 961 | 770 | 735 | 805 | 795 | 720 | 700 | 629 | 961 | 790 | ||
| 1800 AD | 813 | 1,125 | 954 | 900 | 900 | 813 | 1,125 | 980 | |||||
| 1850 AD | 1,128 | 1,402 | 1,241 | 1,265 | 1,200 | 1,200 | 1,128 | 1,402 | 1,260 | ||||
| 1900 AD | 1,550 | 1,762 | 1,633 | 1,650 | 1,710 | 1,656 | 1,625 | 1,600 | 1,550 | 1,762 | 1,650 | ||
| 1910 AD | 1,750 | 1,750 | |||||||||||
| 1920 AD | 1,860 | 1,860 | |||||||||||
| 1930 AD | 2,070 | 2,070 | |||||||||||
| 1940 AD | 2,300 | 2,300 | |||||||||||
| 1950 AD | 2,400 | 2,556 | 2,527 | 2,516 | 2,500 | 2,400 | 2,486 | 2,520 | 2,556 | ||||
Sources:
Biraben, Jean-Noel, 1980, An Essay Concerning Mankind's Evolution,
Population, Selected Papers, December, table 2.
Durand, John D., 1974, "Historical Estimates of World Population: An Evaluation,"
University of Pennsylvania, Population Center,
Analytical and Technical Reports, Number 10, table 2.
Haub, Carl, 1995, "How Many People Have Ever Lived on Earth?"
Population Today, February, p. 5.
McEvedy, Colin and Richard Jones, 1978, "Atlas of World Population History,"
Facts on File, New York, pp. 342-351.
Thomlinson, Ralph, 1975, "Demographic Problems, Controversy Over Population Control,"
Second Edition, Table 1.
United Nations (UN), 1973, The Determinants and Consequences of
Population Trends, Population Studies, No. 50., p.10.
United Nations, 1999, The World at Six Billion, Table 1, "World Population From"
Year 0 to Stabilization, p. 5,
http://www.un.org/esa/population/publications/sixbillion/sixbilpart... 
longdesc="This link to a non-federal Web site does not imply endorsement of any particular product, company, or content."
title="This link to a non-federal Web site does not imply endorsement of any particular product, company, or content."
alt="This link to a non-federal Web site does not imply endorsement of any particular product, company, or content." />
U.S. Census Bureau (USCB), 2008, "Total Midyear Population for the World: 1950-2050",
Data updated 12-15-2008,
http://www.census.gov/ipc/www/idb/worldpop.html
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