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Questions related from Prema Hettiarachchi
Generally, the daily rainfalls are recorded at fixed time intervals (e.g., from 9 am to 9 am). We can find such records of historical rainfalls for centuries. However, in such records, even the...
21 November 2023 5,815 2 View
I have a problem of designing a salinity barrier on a river flowing through a large agricultural area, susceptible for flooding, to prevent saltwater intrusion to domestic water supply intakes....
03 November 2023 2,132 0 View
This question is mainly targeted to Sri Lankan Engineers, Meteorologists, Agronomists and Lawyers. Even the foreign researchers and consultants who familiar with the system (‘Udawalawa’ &...
07 September 2023 9,064 0 View
Mine is a tropical country which has developed freshwater reservoirs in different eras of the history (new and ancient), mainly for the purpose of irrigation and hydropower. Those reservoirs are...
27 August 2023 5,513 1 View
Udawalawa is a large reservoir constructed in 1960s, mainly for the purpose of irrigation. Later, around 1990s, hydropower reservoir was constructed at the upstream of the same catchment...
12 August 2023 3,875 2 View
I have annual maximum water levels of a river station for 60 years from the water year 1959/60 to 2019/20, but there is a period of missing data for five years from 1965/66. Can I take remaining...
02 December 2021 9,296 5 View
I have hourly rainfalls of a station for the last 7 years and daily rainfalls (9 to 9 am) before that (for 25 years) and want to compute 24 hour rainfall of 50-year Return Period. I noticed...
13 March 2021 4,121 3 View
I have hourly water levels of a river station which was subjected to 45 floods in a 30-year period. Please recommend the best method (POT or annual maximum) for flood frequency analysis. The data...
04 October 2020 6,170 3 View
What is the possible range of Runoff Coefficient (Runoff / Rainfall ratio) of tropical rain-forests with sloping terrain and experience over 2000 mm average annual rainfall? What are the...
13 August 2020 6,004 8 View
Scientists have observed nearly 1 degree Celsius increase of global mean temperature during the last 100 years and they make different predictions / projections on climate change. Has any...
10 October 2019 8,546 7 View
Global climate projections are normally use the past data and various types of models. Those models use different input conditions (scenarios). Based on the projected climatic conditions, many...
11 April 2019 1,934 5 View
My country (Sri Lanka) is famous for ancient reservoirs built for collecting rainwater for agriculture and domestic purposes. Their history goes beyond few hundred years B.C. but still maintained...
01 January 1970 2,345 1 View
