A total of four people have died in storms and flooding since Sunday.
Heavy rains on Monday flooded the homes of at least 1,000 people in the Boeung Kak lake area of Phnom Penh.
Local authorities are still assessing the damage from Sunday's storm, which may have destroyed some homes.
Lack of information about proposed Sambor hydro dam across the Mekong in Kratie raises concerns for locals.
The high cost of the systems mean they are generally installed for the well-off, in places like new villas.
The government has been tearing down these kinds of reservoirs since late June, under the new Tonle Sap Authority.
The meeting was to discuss a draft law to bolster protections against pesticides and other dangerous chemicals.
Expanded plantations and mining and plans for massive hydropower dams have given rise to concerns for villagers.
Ek Sonn Chan, the head of Phnom Penh’s water authority, says he wants to get clean water to Cambodians beyond the capital.
Seeing Gulf Coast oil spill, environmental and other groups in Cambodia say the country needs to do more to safeguard its environment.
The award will be conferred to the Phnom Penh Water Authority during World Water Week in Stockholm, which begins Sept. 5.