Irrigation

Once the Great River overtops its banks, the water needs to be channeled into the canals, to ensure water supply for the whole year. The research of Irrigation will allow building an efficient water supply system, and creating a good basis for sustainable agriculture.
Each year when a flood occurs, lots of thick rich mud is habitually driven to the banks of the Great River. This substance is an excellent natural fertilizer that makes the soil extremely fertile. As soon as the water level goes down, there is no time to lose: your field workers should be ready to plant seeds, and then immediately after begin to drive donkeys and cattle over the fields, so that they can tread over the area to firm the seeds in the soil. To make sure that the sun does not turn your fields into desert, it is vital to have an efficient irrigation system in place, though. Through the research of the modern year-round irrigation techniques your empire will be able to grow enough wheat to provide your people with food.

– Hieroglyphics reduces research costs by 1% per level.

Level	Research Cost					Research Time	Papyrus Production
Hieroglyphics level 1 – Library level 1
1	9	–	44	148	2	00:00:07	+0.5%
2	13	–	65	219	2	00:00:16	+1%
3	20	–	97	324	4	00:00:26	+1.5%
4	31	–	143	481	6	00:00:37	+2%
5	46	–	212	711	9	00:00:48	+2.5%
6	70	–	315	1.054	14	00:01:00	+3%
7	103	–	467	1.560	21	00:01:13	+3.5%
8	153	–	692	2.309	31	00:01:28	+4%
9	227	–	1.024	3.417	46	00:01:43	+4.5%
10	336	–	1.517	5.058	68	00:02:02	+5%
Hieroglyphics level 20
11	403	–	1.814	6.050	100	00:02:23	+5.5%
12	596	–	2.686	8.954	149	00:02:48	+6%
13	883	–	3.975	13.252	220	00:03:18	+6.5%
14	1.307	–	5.884	19.614	326	00:03:51	+7%
15	1.935	–	8.708	29.029	483	00:04:33	+7.5%
16	2.864	–	12.888	42.964	716	00:05:22	+8%
17	4.238	–	19.076	63.586	1.059	00:06:23	+8.5%
18	6.273	–	28.232	94.108	1.568	00:07:36	+9%
19	9.284	–	41.784	139.280	2.321	00:09:06	+9.5%
20	13.741	–	61.840	206.135	3.435	00:10:56	+10%
Hieroglyphics level 30
21	17.796	–	80.083	266.945	5.084	00:13:12	+10.5%
22	26.338	–	118.524	395.080	7.525	00:16:01	+11%
23	38.980	–	175.415	584.718	11.137	00:19:30	+11.5%
24	57.691	–	259.614	865.383	16.483	00:23:49	+12%
25	85.383	–	384.230	1.280.767	24.395	00:29:11	+12.5%
26	126.368	–	568.660	1.895.536	36.105	00:35:51	+13%
27	187.026	–	841.617	2.805.394	53.436	00:44:40	+13.5%
28	276.798	–	1.245.594	4.151.982	79.085	00:54:31	+14.0%
29	409.661	–	1.843.480	6.144.935	117.046	01:07:27	+14.5%
30	606.300	–	2.728.350	9.094.504	173.228	01:23:34	+15%
Hieroglyphics level 40 – Library level 40
31	769.135	–	3.461.108	11.537.028	256.378	01:02:50	+15.5%
32	1.138.320	–	5.122.440	17.074.802	379.440	01:18:03	+16%
33	1.684.713	–	7.581.211	25.270.707	561.571	01:37:04	+16.5%
34	2.493.376	–	11.220.193	37.400.646	831.125	02:00:48	+17%
35	3.690.196	–	16.605.886	55.352.987	1.230.065	02:30:28	+17.5%
36	5.461.491	–	24.576.712	81.922.377	1.820.497	03:07:31	+18%
37	8.083.007	–	36.373.535	121.245.118	2.694.335	03:53:49	+18.5%
38	11.962.851	–	53.832.832	179.442.775	3.987.617	04:51:40	+19%
39	17.705.020	–	79.672.592	265.575.307	5.901.673	06:03:58	+19.5%
40	26.203.430	–	117.915.436	393.051.456	8.734.476	07:34:19	+20%
The research may be further developed.